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Sedimentation enhancing strategy
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<h2 id="benefits-of-sedimentation-enhancing-strategies">Benefits of sedimentation enhancing strategies</h2> <p>When compared to conventional <a href="/facts/Flood_control/rf0476SJ">flood protection infrastructure</a> such as <a href="/facts/Levee/99xdvoVg">embankments</a> and <a href="/facts/Seawall/mccVfcKm">seawalls</a>, sedimentation enhancing strategies provide various benefits. Firstly, flood protection structures can exacerbate environmental problems in deltas: <a href="/facts/Land_reclamation/taYL4BjI">land reclamation</a> and <a href="/facts/Levee/99xdvoVg">levee construction</a> result in a loss of water storage area during peak <a href="/facts/Discharge_(hydrology)/aFeFEHpC">river discharges</a>, which may cause an increased risk of <a href="/facts/Flood/FDQjJeXW">flooding</a> further downstream. Embankments also exacerbate land elevation loss due to <a href="/facts/Drainage/thEd3nfB">soil drainage</a> and hinder natural sediment accumulation.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> In contrast, sedimentation enhancing strategies do not cause these problems and instead address multiple issues simultaneously: they reduce <a href="/facts/Flood/FDQjJeXW">flood</a> risks while simultaneously restoring <a href="/facts/Ecosystem/kVE8mSmR">ecosystems</a>, enhancing production (e.g. <a href="/facts/Fishery/TBvcT9bB">fisheries</a>) and cultural (e.g. <a href="/facts/Landscape/pU9HneR0">landscape</a>) <a href="/facts/Ecosystem_service/Fm4owYGV">ecosystem services</a>.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a><a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> </p><p>Sedimentation enhancing strategies are also more flexible than conventional flood protection. Large-scale infrastructural flood defences are costly and rigid, requiring considerable investment to adapt infrastructural flood defences to changing <a href="/facts/Boundary_value_problem/QEfmUqmP">boundary conditions</a>.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> Particularly considering uncertain future <a href="/facts/Climate_change_scenario/MCHKP59V">scenarios</a> due to <a href="/facts/Climate_change/rEN4BDE7">climate change</a>, sea-level rise and peak river discharges, rigid flood defences may not be the optimal choice.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> Sedimentation enhancing strategies are more flexible and adaptable to changing <a href="/facts/Natural_environment/NzGY148M">environmental conditions</a>, which makes them more likely to perform satisfactorily under different future scenarios.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> </p> <h2 id="limitations-of-sedimentation-enhancing-strategies">Limitations of sedimentation enhancing strategies</h2> <p>One major obstacle to the implementation of sedimentation enhancing strategies is that they require space which may not be available, as deltas are among the most <a href="/facts/Population_density/70zGTCFc">densely populated</a> regions in the world.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> <a href="/facts/Land_development/W6dVvXjT">Land-use change</a> to make space for sedimentation enhancing strategies requires <a href="/facts/Stakeholder_engagement/2DlJN2Bl">stakeholder participation</a>, but delta inhabitants may not be willing to change land uses.<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> Additionally, a <a href="/facts/Environmental_impact_of_reservoirs/skuUpJs6">decline in river sediment delivery</a> due to upstream <a href="/facts/Dam/BroJFhEI">dam construction</a> and other environmental changes in catchments caused by human activities<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> means that less sediment is available in deltas for sedimentation enhancing strategies. The success of sedimentation enhancing strategies is highly context dependent and depends on, for example, river discharge, <a href="/facts/Suspended_load/ecP7M4Pq">sediment concentration</a> in the water, land-use in the delta, the <a href="/facts/Tidal_range/6TIJEpLN">tidal range</a>, stakeholder engagement, and the <a href="/facts/Economy/okLWSsEY">financial resources</a> of the country in which the delta is located. </p> <h2 id="types-of-sedimentation-enhancing-strategies">Types of sedimentation enhancing strategies</h2> <h3>River diversions</h3> <p>In many deltas worldwide, rivers are disconnected from delta plains by embankments or levees which constrain water bodies and prevent hydrological exchange between water and land. River diversions, designed to correct the issue of disconnection caused by <a href="/facts/Geotechnical_engineering/Nw55uq9R">hydrological engineering</a>, are engineered structures along a river that direct water and sediments from the river into adjacent <a href="/facts/Wetland/9abbP7CR">wetlands</a>.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a><a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a><a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> Diversion structures can range from simple gates to more complex siphon or pump systems.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> In addition to requiring the engineered structures at the point of river diversions, this strategy relies on natural land-building processes. River water loses <a href="/facts/Energy/wd8PrQM7">energy</a> and slows down as it passes from the relatively narrow river into the wider receiving area, causing sediments to be <a href="/facts/Deposition_(geology)/qxjlY8KL">deposited</a>, which raises the elevation of the land and may lead to the formation of new land.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a><a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> </p> <h4>Mississippi River delta, Louisiana, USA</h4> <p>Over the 20th century the <a href="/facts/Mississippi_River_delta/GcnP93vT">Mississippi delta</a> lost approximately 25% of its land.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a><a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a> Currently, land is disappearing at a rate of almost 11,000 <a href="/facts/Acre/FDPa5k4G">acres</a> per year.<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> To combat these rapid rates of <a href="/facts/Land_loss/U3JrTHgr">land loss</a>, the <a href="/facts/Louisiana_Coastal_Protection_and_Restoration_Authority/9TjGxTIC">Louisiana Coastal Protection and Restoration Authority</a> (CPRA) developed a $50 billion, 50-year plan for the Mississippi delta, a central component of which is the reintroduction of river water and sediment to the delta plain through river diversions.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a><a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> Engineered river diversions have previously been implemented in the Mississippi delta at <a href="/facts/Caernarvon,_Louisiana/NRsltGRj">Caernarvon</a> and Davis Pond. Although these diversions were not constructed with the primary goal of building land, land growth occurred at both sites. The 2 km wide Caernarvon diversion resulted in sediment deposition of up to 42 cm in the receiving area, creating a <a href="/facts/Crevasse_splay/v1SVj7sj">crevasse splay</a> of approximately 130 km2 within three months.<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> The currently planned <a href="/facts/Mid-Barataria_Sediment_Diversion/ecULxcX9">Mid-Barataria</a>, Lower-Barataria and Breton diversions have been specifically designed to capture and divert sediment from the Mississippi river and deposit it in the receiving <a href="/facts/Drainage_basin/lzsx0XJS">basins</a> to build land.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> </p> <h4>Canal del Dique, Colombia</h4> <p><a href="/facts/Canal_del_Dique/h2Gt3ymw">Canal del Dique</a> is a 400-year-old <a href="/facts/Canal/pBE8LsJx">navigation channel</a> connecting the <a href="/facts/Magdalena_River/5mnAfJwL">Rio Magdalena</a> with the Bay of Cartagena in <a href="/facts/Colombia/nl7r8Q2u">Colombia</a>.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> The construction of this channel increased the flow of water and sediment into the Bay of Cartagena.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> Sediment deposition in the <a href="/facts/Canal/pBE8LsJx">canal</a>, connected <a href="/facts/Lake/YP0xxn0E">lakes</a> and <a href="/facts/Swamp/rjE9QKpm">swamps</a>, and in the Bay of Cartagena negatively impacted the environment. In 2013, Dutch company Royal HaskoningDHV designed a plan including two control structures on the canal. One control structure was built upstream to regulate the amount of water and sediment flowing from the Rio Magdalena into the Canal del Dique. The second control structure was built downstream of the canal at Puerto Badel to divert water and sediment toward a <a href="/facts/Mangrove/JreUUsuG">mangrove</a> area west of the canal. In this way, the mangrove area is restored, land is being built, and at the same time the amount of sediment input in the Bay of Cartagena is reduced which promotes <a href="/facts/Restoration_ecology/gJ6wT9Gg">ecological restoration</a>.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a><a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a> </p> <h3>Tidal flooding of previously enclosed areas</h3> <p><a href="/facts/Tidal_flooding/zCSlNdkl">Tidal flooding</a> of <a href="/facts/Polder/PVssoPSg">polders</a> entails (temporarily) breaching <a href="/facts/Levee/99xdvoVg">dikes</a> and allowing <a href="/facts/Tide/zNstvWPv">tidal water</a> to flow into an embanked area during <a href="/facts/High_tide/zNstvWPv">high tide</a>.<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a><a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> Tidal water can bring in large concentrations of sediment from the <a href="/facts/Sea/7eo8zrRW">sea</a> into the river system, which deposit and accrete within the polder when <a href="/facts/Flow_velocity/amIT4Ht8">flow velocities</a> reduce. Tidal flooding of polders is an alternative form of <a href="/facts/Coastal_management/wKDWbhY0">coastal defence</a> that makes use of natural tidal dynamics and associated <a href="/facts/River_morphology/Eq3xDTyE">morphological</a> processes.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> During the time the polder is flooded, the area can be used for <a href="/facts/Aquaculture/MYdIMfbt">aquaculture</a>.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a> We distinguish between tidal river management, implemented in the <a href="/facts/Ganges_Delta/xanGR8xt">Ganges-Brahmaputra-Meghna delta</a>, <a href="/facts/Bangladesh/NXk4f78Y">Bangladesh</a>, and exchange polders, implemented in the <a href="/facts/Rhine%E2%80%93Meuse%E2%80%93Scheldt_delta/E5CoKcaF">Rhine-Meuse delta</a>, <a href="/facts/Netherlands/y8xn5stT">the Netherlands</a>. </p> <h4>Ganges-Brahmaputra-Meghna delta, Bangladesh</h4> <p>Polders, known as <a href="/facts/Beel/zX1EEEoF">beels</a> in <a href="/facts/Bengal/xp3t2Dyd">Bengal</a>, have been constructed in Bangladesh since the 1960s.<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> The embankments provide flood protection and initially increased <a href="/facts/Agriculture/TGztqzJs">agricultural production</a>. However, together with a decrease in <a href="/facts/Water_supply/1UuexMtl">water supply</a> due to upstream dam construction, the embankments caused an increase in riverbed sedimentation and congestion, hampering water drainage and <a href="/facts/Navigation/sGGAJ0AQ">navigation</a>. Another issue in Bangladesh is <a href="/facts/Waterlogging_(agriculture)/t46n5bue">waterlogging</a>, which negatively impacts the <a href="/facts/Agricultural_productivity/bUIfYsFW">agricultural productivity</a> of the region.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a> Tidal river management (TRM) emerged as a bottom-up, <a href="/facts/Indigenous_peoples/zyzBMXBS">indigenous</a> strategy to reduce waterlogging and solve river <a href="/facts/Traffic_congestion/CTl1sfGX">congestion</a> problems in Bangladesh. TRM is also seen as a <a href="/facts/Climate_change_adaptation/RoUgv5FF">climate change adaptation</a> measure due to its potential to raise land through sedimentation and allow residents to cope with changing environmental conditions. TRM involves temporarily breaching levees around low-lying polders to allow river water to flow in.<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a><a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a> When the water flows into embanked areas during high tide, water flow velocities reduce and sediments deposit.<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a><a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> During low tide, water flow velocity increases again as the water is pulled back through the <a href="/facts/Channel_(geography)/zanMS2Ek">channels</a> toward the sea, causing deposited <a href="/facts/Stream_bed/9hcQPGaj">riverbed</a> sediment to erode. This increases the <a href="/facts/Drainage/thEd3nfB">drainage capacity</a> and navigability of the channels.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a><a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a> TRM has been implemented in five beels in the south of the Ganges-Brahmaputra-Meghna delta. The implementation of TRM by local people (<a href="/facts/Top-down_and_bottom-up_design/MvtTkA3x">bottom-up</a>) has been particularly successful. For example, land in beel Bhaina was raised by 1.5–2 meters near the cut point in the embankment and by 0.2 meters toward the other end of the beel.<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> Due to the success of TRM, the <a href="/facts/Bangladesh_Water_Development_Board/cGGVHe53">Bangladesh Water Development Board</a> also formally implemented TRM in multiple beels, which has been less successful due to the top-down implementation causing conflict between locals and formal institutions.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a> </p> <h4>Western Scheldt, the Netherlands</h4> <p>The first land reclamation efforts in the southwestern Rhine-Meuse delta in the Netherlands date back to <a href="/facts/Middle_Ages/RqzEKB9v">the Middle Ages</a>. Since then, the area has experienced multiple <a href="/facts/Storm/tgStaeS3">storms</a> and <a href="/facts/Extreme_weather/gzcNR4BC">extreme weather conditions</a>, amongst which the <a href="/facts/North_Sea_flood_of_1953/wydALEQr">flood disaster of 1953</a> which led to the construction of the <a href="/facts/Delta_Works/7kJJopkl">Delta Works</a>.<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a> The construction of <a href="/facts/Dam/BroJFhEI">dams</a>, <a href="/facts/Lock_(water_navigation)/rFGHXS0p">locks</a> and <a href="/facts/Flood_barrier/hJ19Pv4D">storm surge barriers</a>, and the strengthening and raising of dikes in the area, initially increased <a href="/facts/Flood_control/rf0476SJ">flood safety</a>. However, over time, the land behind dikes started to sink which is highly problematic in the face of sea-level rise.<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> </p><p>In the <a href="/facts/Western_Scheldt/sDYCb8F5">Western Scheldt</a>, a strategy similar to TRM has been proposed to naturally raise the land.<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> During high tide, the Western Scheldt delivers sediment to the areas outside of the embankments. As a result, these areas naturally rise with <a href="/facts/Water_level/tUYQsFkI">water levels</a>.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> This is illustrated by <a href="/facts/Saeftinghe/4eETCRWg">het verdronken land van Saefthinge</a>, an area that lies outside of the embankments but has a higher elevation than other areas that are protected by embankments in Zeeland.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a> Following this example, exchange polders, in Dutch called wisselpolders, are proposed. Exchange polders make use of natural sedimentation processes to create a <a href="/facts/Buffer_zone/ITsYfLoo">buffer</a> of elevated land along the estuary, protecting the land behind the dikes against flooding.<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> Exchange polders can be created by breaching the seaside embankment to allow tidal water to flow into the embanked area. A second embankment on the other side of the polder stops the tidal water from flowing further land inwards.<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> The area between the embankments would be reconnected to the Western Scheldt and should therefore gradually <a href="/facts/Silt/HAxJkhDP">silt</a> up as the tidal water slows down.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a> Exchange polders have not been implemented yet, because the plan has been critiqued by local farmers. They question the idea of giving land back to nature as there is already a shortage of space in The Netherlands, and are afraid of increased <a href="/facts/Soil_salinity/P6bXhlLE">salinisation</a> in the area.<a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a> </p> <h3>Creation of low energy aquatic conditions</h3> <p>Some sedimentation enhancing strategies focus specifically on creating low energy conditions in <a href="/facts/Shallow_water_marine_environment/2NdNHpc8">shallow water</a>. Sediment deposition occurs when the water flow slows down, as the water no longer has the <a href="/facts/Energy/wd8PrQM7">energy</a> to carry heavier <a href="/facts/Sediment/zsIH1A6U">sediment particles</a> and so they sink.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a> Examples of strategies that stimulate low energy conditions are <a href="/facts/Semipermeable_membrane/YxENKzn5">semi-permeable structures</a> made of materials such as <a href="/facts/Wood/z13NpHPl">wood</a>, <a href="/facts/Twig/w7tnrzU7">twigs</a> and brushwood. </p> <h4>Ems-Dollard estuary, the Netherlands and Germany</h4> <p>The Ems-Dollard estuary is located on the border between <a href="/facts/Netherlands/y8xn5stT">the Netherlands</a> and <a href="/facts/Germany/paluuWBX">Germany</a> and has a high <a href="/facts/Silt/HAxJkhDP">silt</a> <a href="/facts/Suspended_load/ecP7M4Pq">concentration</a>.<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a> However, the silt cannot settle on the delta plains due to flood <a href="/facts/Flood_control/rf0476SJ">control</a> <a href="/facts/Levee/99xdvoVg">levees</a> that disconnect the land from the water. Additionally, channels in the area have been widened and deepened over time for <a href="/facts/Navigation/sGGAJ0AQ">navigation</a>, increasing the strength of the tidal inland flood <a href="/facts/Tide/zNstvWPv">current</a> and weakening the <a href="/facts/Ebb_tide/zNstvWPv">ebb</a> current back to the <a href="/facts/Sea/7eo8zrRW">sea</a>, resulting in a surplus of silt being transported from the sea into the <a href="/facts/Estuary/WmkSInmK">estuary</a>.<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a><a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> </p><p>Silt concentration in the Ems-Dollard estuary increased from 40 mg/L in 1954 to 80–100 mg/L currently,<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a> significantly reducing the <a href="/facts/Water_quality/PcEERmpX">water quality</a>. The more silt water contains the more <a href="/facts/Turbidity/aqPf0q3I">turbid</a> the water is, which reduces the amount of <a href="/facts/Light/jeofpMn4">light</a> that can penetrate the water and inhibits <a href="/facts/Algae/U1ftVKU3">algae growth</a>. Algae are <a href="/facts/Marine_primary_production/ukC0nbTQ">primary producers</a>: they use <a href="/facts/Carbon_dioxide/xGzpppEp">CO2</a>, water and light to produce <a href="/facts/Oxygen/acyn6o8r">oxygen</a> and food for other aquatic animals. Reduced algae growth therefore impacts oxygen and food availability for the entire food chain.<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a><a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a> Climate change climate change-induced sea-level rise may negatively impact <a href="/facts/Primary_production/14RzcF5E">primary production</a> and the <a href="/facts/Food_chain/mvDKQTGu">food chain</a>, but may also drown the Ems-Dollard system, so pilot sedimentation projects are being executed in the estuary. The aim is to trap silt particles on kwelders, which are land areas covered with vegetation that lie outside of the <a href="/facts/Levee/99xdvoVg">embankments</a>. This can be done by placing <a href="/facts/Willow/F66Xvslm">willow</a> <a href="/facts/Groyne/3T8vmduI">groynes</a>, wooden posts connected with branches, in the ground along the kwelder, slowing down the water and encouraging <a href="/facts/Sedimentation/qUgHGvhd">sedimentation</a>, which may eventually create new land.<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a> </p><p>Another way in which silt sedimentation is stimulated in the Ems-Dollard estuary is by the construction of double <a href="/facts/Levee/99xdvoVg">dikes</a>. The area in between the dikes is filled with water by a controlled <a href="/facts/Culvert/J7DTG3BK">culvert</a>, where silt can settle more easily due to low flow or <a href="/facts/Water_stagnation/1cbBED8V">stagnant</a> water conditions. The settled silt can be used to make <a href="/facts/Clay/xnwouEkB">clay</a> which is used to strengthen and raise dikes in the area.<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a> </p> <h4>Wulan delta, Indonesia</h4> <p>The Wulan delta is located in the <a href="/facts/Demak,_Demak/HRCLHeM8">Demak</a> district, northern <a href="/facts/Java/2MNA2rLm">Java</a>, <a href="/facts/Indonesia/vQnWU3IW">Indonesia</a>. Northern Java's deltaic <a href="/facts/Shore/yRlfT1Q6">shorelines</a> suffer from severe <a href="/facts/Coastal_erosion/nIj8kCHP">coastal erosion</a>.<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a> More than 3 kilometres of the Demak shoreline has already been lost to the sea.<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a> The main causes of coastal erosion are the conversion of <a href="/facts/Mangrove/JreUUsuG">mangrove</a> forests to <a href="/facts/Aquaculture/MYdIMfbt">aquaculture</a>, <a href="/facts/Land_reclamation/taYL4BjI">land reclamation</a> for coastal infrastructure, and <a href="/facts/Water_extraction/xbl4DsBL">groundwater extraction</a> causing land <a href="/facts/Subsidence/EIwtz9w9">subsidence</a>.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a><a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a> Mangrove restoration has been proposed as a strategy to halt coastal erosion in the district of Demak. Solely replanting mangroves in the area was not possible, because the <a href="/facts/Wave/fU0HH6St">wave</a> exposure, <a href="/facts/Submersion_(coastal_management)/gLkN4DNT">submersion</a> time and sediment conditions were no longer optimal.<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a> Instead, a strategy similar to the <a href="/facts/Willow/F66Xvslm">willow</a> <a href="/facts/Groyne/3T8vmduI">groynes</a> in the Ems-Dollard estuary was implemented. <a href="/facts/Semipermeable_membrane/YxENKzn5">Semi-permeable</a> barriers were built along the Demak <a href="/facts/Coast/RBD0wxn3">coast</a> using local materials such as <a href="/facts/Bamboo/wGPJ2cEA">bamboo</a>, <a href="/facts/Twig/w7tnrzU7">twigs</a> and other brushwood.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a> These structures let sea and <a href="/facts/Discharge_(hydrology)/aFeFEHpC">river water</a> pass through, dampen waves, capture sediment and create sheltered, low-energy conditions near the shoreline for sediment accretion. The main idea behind this strategy is that mangroves <a href="/facts/Seed/a4xGSLxJ">seeds</a> will colonise the area naturally when the shore <a href="/facts/Elevation/h2d0u9nd">bed level</a> accretes high enough.<a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a> </p><p>Initially, the <a href="/facts/Permeability_(Earth_sciences)/ja7dRwgU">permeable</a> structures captured considerable amounts of sediment raising bed levels behind the structures. Some locations were naturally recolonised by <a href="/facts/Mangrove/JreUUsuG">mangroves</a>, in other locations mangroves were replanted. However, juvenile mangroves only survived in the best protected <a href="/facts/Sediment_basin/HxTcUDIP">sedimentation basins</a>. Elsewhere, they disappeared again after a few years because the bed level dropped below sea level again due to subsidence.<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a> </p> <h3>Wetland restoration</h3> <p class="note">Main article: <a href="/facts/Wetland_restoration/9abbP7CR">Wetland restoration</a></p> <p><a href="/facts/Wetland/9abbP7CR">Coastal wetlands</a> are <a href="/facts/Ecosystem/kVE8mSmR">ecosystems</a> temporarily or permanently flooded by water. Wetland <a href="/facts/Vegetation/nAHr9kjk">vegetation</a> serves important functions: it <a href="/facts/Attenuation/XP4vX360">attenuates</a> incoming waves and encourages sediment deposition. The resulting rise in land elevation allows some wetlands to keep up with sea-level rise.<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a><a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a> Many wetlands have been converted to other land uses by constructing dikes, seawalls and embankments to prevent water encroachment. As a result, wetlands are disconnected from hydrological input and no longer receive sediment, which inhibits land raising and can result in land elevation loss. One strategy to restore wetlands is depolderisation, which entails breaching dikes and reconnecting wetlands to rivers, <a href="/facts/Estuary/WmkSInmK">estuaries</a> or the <a href="/facts/Sea/7eo8zrRW">sea</a>, restore the natural <a href="/facts/Hydrology/Xh727cnE">hydrology</a> and land-building capacities of wetlands.<a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a><a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a> </p> <h4>Biesbosch, the Netherlands</h4> <p>Depolderisation has occurred in a polder in the <a href="/facts/De_Biesbosch_National_Park/r5HpQRdc">Biesbosch</a> under the Dutch <a href="/facts/Room_for_the_River_(Netherlands)/YpqfvwgF">Room for the River</a> program. The Biesbosch is a 9000-ha freshwater tidal wetland in the southwestern part of the Netherlands. Water and sediments were reintroduced to the Noordwaard, an agricultural polder in the Biesbosch, in 2008.<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a> The embankments were lowered by 2 meters to reconnect the Biesbosch wetlands with the <a href="/facts/Merwede/Nahzatg8">Merwede river</a>, a distributary of the lower <a href="/facts/Rhine/MgJ88oaz">Rhine</a>. This project aimed to allow flooding during peak discharges of the Rhine and <a href="/facts/Meuse/NBSBxVqp">Meuse</a> rivers, with the restored tidal and flood dynamics encouraging <a href="/facts/Restoration_ecology/gJ6wT9Gg">ecosystem restoration</a>.<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a><a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a> The results of this restoration effort were that the Biesbosch area trapped approximately 46% of the incoming sediment, and the average <a href="/facts/Aggradation/L6FLnvas">aggradation</a> rate was 5.1 mm per year.<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a><a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a> In February 2020, the Noordwaard polder flooded for the first time due to high water levels in the rivers caused by a <a href="/facts/Storm/tgStaeS3">storm</a> and <a href="/facts/Spring_tide/zNstvWPv">spring tide</a>.<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a> </p> <h4>Sacramento-San Joaquin delta, California, USA</h4> <p>Wetlands in the <a href="/facts/Sacramento%E2%80%93San_Joaquin_River_Delta/c99rQzqz">Sacramento-San Joaquin delta</a> are rapidly losing elevation. Under natural conditions, wetlands in the delta were frequently flooded. The soil was <a href="/facts/Waterlogging_(agriculture)/t46n5bue">waterlogged</a> and <a href="/facts/Anaerobic_digestion/EUaMIVpM">anaerobic</a>, and under these conditions <a href="/facts/Total_organic_carbon/noBXADsJ">organic carbon</a> accumulates faster than it decomposes, resulting in <a href="/facts/Aggradation/L6FLnvas">soil accumulation</a>. However, wetlands in the Sacramento-San Joaquin delta have been drained for agricultural purposes, so the soil is now situated at or above the <a href="/facts/Water_table/2j0VD0lF">water table</a> where it can <a href="/facts/Redox/Pyd5RVcj">oxidize</a> and decompose quickly resulting in a loss of elevation.<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a> Many former wetlands in the area are now more than 6 meters below <a href="/facts/Sea_level/mDhuI7Xe">mean sea-level</a> and <a href="/facts/Subsidence/EIwtz9w9">subsidence</a> rates of up to 5 cm per year have been found.<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a><a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a> Shallow flooding of land is a strategy used to reduce subsidence and restore wetlands in the delta. Adding a layer of water to the soil restores anaerobic conditions, which results in the accretion of new <a href="/facts/Peat/F0kJcsLt">peat</a> and increases <a href="/facts/Elevation/h2d0u9nd">surface elevation</a>. Mean rates of land surface elevation gain in the study wetlands were 4 cm per year.<a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a> </p> <h3>Mangrove restoration</h3> <p class="note">Main article: <a href="/facts/Mangrove_restoration/84pGEsvf">Mangrove restoration</a></p> <p><a href="/facts/Mangrove/JreUUsuG">Mangroves</a> provide a wide range of <a href="/facts/Ecosystem_service/Fm4owYGV">ecosystem services</a>, such as <a href="/facts/Habitat/zo1DN2gA">habitat</a> for <a href="/facts/Aquatic_ecosystem/TkNqBg4N">aquatic</a> species, <a href="/facts/Carbon_sequestration/WDBvr9eU">carbon sequestration</a>, and their <a href="/facts/Root/x2U60Gdm">root systems</a> reduce the impact of incoming waves and capture sediment resulting in land elevation gain. Mangroves also play a role in mitigating the effects of <a href="/facts/Climate_change/rEN4BDE7">climate change</a> and <a href="/facts/Extreme_weather/gzcNR4BC">extreme weather</a> events.<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a><a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a> For all these reasons, mangrove forests are one of the most powerful <a href="/facts/Nature-based_solutions/T2fc95Sq">nature-based solutions</a> to climate change.<a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a> However, almost 70 percent of mangroves are currently lost or degraded, and they are still rapidly deteriorating.<a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a><a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a> Mangrove forests can be restored in several ways, for example through providing space for expansion or by <a href="/facts/Transplanting/7KP9QrXs">replanting</a>. If relieved from human pressures, mangrove species can quickly <a href="/facts/Recolonization/cym2EL5k">recolonise</a> degraded areas, depending on the availability of <a href="/facts/Seed/a4xGSLxJ">seeds</a> and the ability of seeds to access degraded areas. In areas where seeds cannot easily migrate, replanting is the best option.<a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a> </p><p>Mangrove restoration efforts have taken place in the <a href="/facts/Mahakam_River/uUttBQw5">Mahakam delta</a>, <a href="/facts/Indonesia/vQnWU3IW">Indonesia</a>. From the 1990s onwards, the mangrove forests in the delta have been under intense pressure from <a href="/facts/Aquaculture/MYdIMfbt">aquaculture</a>: 60-75% of mangrove forests in the Mahakam delta have been converted into <a href="/facts/Shrimp_fishery/GECbkLy5">shrimp ponds</a>.<a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a><a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a> Since 2000, private oil and gas companies have funded various mangrove replanting efforts. From 2001 to 2005, <a href="/facts/Total_SE/4KJe17r6">Total E&P</a> Indonesia planted over 3.5 million trees in the delta, covering an area of 646 ha.<a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a> Total E&P invest in mangrove rehabilitation for various reasons, for instance to reduce <a href="/facts/Erosion/gaGJXy0W">erosion</a> and ecosystem degradation<a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a> which is seen as a threat to <a href="/facts/Natural_gas/9MYQ7NAP">gas operations</a>,<a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a> and because pipelines installed to transport oil and gas caused mangrove clearing.<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a> Additionally, between 2002 and 2007 the <a href="/facts/Ministry_of_Environment_and_Forestry_(Indonesia)/WdxefAWq">Department of Forestry</a> of the <a href="/facts/Government_of_Indonesia/LKcBKI4z">Indonesian government</a> also planted 819 ha of mangrove forests.<a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a> Restoration programs funded by the government and the oil and gas industry focus on replanting mangroves in abandoned shrimp ponds and encouraging combined mangrove-shrimp aquaculture, also called <a href="/facts/Integrated_mangrove-shrimp_aquaculture/zX2WpqlX">silvofishery</a>.<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a> Mangroves can recover rapidly in the area if the <a href="/facts/Biophysical_environment/PNzMrGrz">physical environment</a> of the delta is not destroyed: every year, hundreds of hectares of cleared areas in the Mahakam delta are naturally recolonised by mangrove vegetation,<a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a> causing accretion.<a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a> </p><p>There is also evidence of sedimentation in restored mangroves in Vietnam.<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a> </p> <h3>Construction of channel networks</h3> <p>The construction of dams reduces the sediment load in rivers downstream. Levees and embankments also inhibit the deposition of sediment on the delta plain, resulting in the loss of land elevation. Research has shown that cutting and dredging of shallow, narrow <a href="/facts/Channel_(geography)/zanMS2Ek">channels</a> on the delta plain can be an effective strategy to increase the input of freshwater and sediments to <a href="/facts/Floodplain/EUKqIbj5">floodplains</a>, <a href="/facts/Lake/YP0xxn0E">lakes</a> and <a href="/facts/Lagoon/IBp4ez2D">lagoons</a> in deltas.<a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a> </p><p>Shallow, narrow channels have been dug in the <a href="/facts/Danube_Delta/lfVQy0sk">Danube delta</a> (<a href="/facts/Romania/yolzk5cN">Romania</a>). The main reason for digging the channels was that <a href="/facts/Fishery/TBvcT9bB">fisheries</a> in the Danube delta were negatively impacted by the limited <a href="/facts/Discharge_(hydrology)/aFeFEHpC">freshwater delivery</a> to the deltaic <a href="/facts/Lake/YP0xxn0E">lakes</a> and <a href="/facts/Lagoon/IBp4ez2D">lagoons</a>.<a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a> The construction of the channel network in the Danube delta almost tripled the <a href="/facts/Discharge_(hydrology)/aFeFEHpC">water influx</a> toward the delta plain. However, at the same time <a href="/facts/Sediment_transport/3uLEbcPG">sediment delivery</a> in the lower Danube river reduced due to the construction of dams upstream.<a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a> Interestingly, sediment deposition on the delta plain did not decrease after <a href="/facts/Dam/BroJFhEI">dam</a> constructions. It has been estimated that the average sediment flux in the Danube delta increased from 0.07 g/cm2 under natural conditions to 0.09-0.12 g/cm2 after the construction of shallow, narrow channels, which could mean a <a href="/facts/Sedimentation/qUgHGvhd">sedimentation</a> rate of 0.5-0.8 mm per year.<a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a> This suggests that the artificial channels function as sediment traps that can assist in preventing delta drowning due to sea-level rise. However, <a href="/facts/Erosion/gaGJXy0W">erosion</a> along the Danube coast has increased since the construction of channels.<a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a> Similar results have been found in the <a href="/facts/Ebro_Delta/5Af5f24k">Ebro delta</a>: channels dug there for <a href="/facts/Rice/wvL1hBCz">rice cultivation</a> deliver sediments to the delta plain resulting in <a href="/facts/Aggradation/L6FLnvas">land accretion</a> rates that may be fast enough to keep up with <a href="/facts/Sea_level_rise/Pb5MGJxb">sea-level rise</a>.<a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a> </p> <h3>Breaching levees</h3> <p class="note">Main article: <a href="/facts/Levee_breach/GqUWWCh0">Levee breach</a></p> <p><a href="/facts/Flood/FDQjJeXW">Flooding</a> is a vital source of <a href="/facts/Fresh_water/xMP2TxwI">fresh water</a> and sediment supply to <a href="/facts/Floodplain/EUKqIbj5">floodplains</a>, important for land elevation maintenance, <a href="/facts/Fertilizer/ysh3r6NJ">soil fertilization</a>, and the support of healthy wetland ecosystems.<a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a> Levees prevent <a href="/facts/Flood/FDQjJeXW">floods</a>, creating <a href="/facts/Polder/PVssoPSg">polders</a> that no longer receive water or sediment and therefore lose elevation. Additionally, due to the construction of polders in upstream parts of deltas, floodwater can no longer be stored on upstream floodplains, causing larger floods downstream.<a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a> A strategy to restore the input of freshwater and sediment to floodplains is intentionally breaching or significantly lowering levees to allow flooding to occur during peak discharges.<a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a> </p> <p>Plans are being made to lower and breach levees in the upper <a href="/facts/Mekong_Delta/Blrw30E1">Mekong delta</a> in <a href="/facts/Vietnam/0ulfA8Eq">Vietnam</a> near the border with <a href="/facts/Cambodia/t1wJd6GU">Cambodia</a>, an area that would normally flood during peak water discharge season from July to December.<a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a><a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a> However, in many areas high levees have been constructed to protect against flooding year-round. With this full flood protection, farmers in the Mekong delta can produce more <a href="/facts/Rice/wvL1hBCz">rice crops</a> per year compared to a system with lower or no levees. However, preventing floodwater and sediment from entering the Vietnamese floodplains resulted in increased peak river discharges and <a href="/facts/Flood_risk_assessment/Np7PJEHS">flood risks</a> downstream, reduced <a href="/facts/Retention_basin/kXIVBuCl">flood retention capacity</a> of floodplains, accumulation of <a href="/facts/Agrochemical/Pf7FXeuG">agrochemicals</a> in the soil, and reduced or eliminated sediment deposition contributing to accelerated land elevation loss.<a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a><a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a><a class="footnote-ref" id="fnref:116" href="#fn:116"><sup>116</sup></a> To ameliorate these negative impacts, steps are being taken in the upper Mekong delta to lower levees. This would allow flood water to enter the plains only during peak season. During the rest of the year, the lower embankments provide sufficient protection for farmers to cultivate their lands.<a class="footnote-ref" id="fnref:117" href="#fn:117"><sup>117</sup></a> </p> <h3>Tidal replicate method</h3> <p>A novel <a href="/facts/Nature-based_solutions/T2fc95Sq">eco-engineering</a> solution to preserve existing <a href="/facts/Intertidal_zone/grnBDVQ3">intertidal</a> wetlands from <a href="/facts/Sea_level_rise/Pb5MGJxb">sea-level rise</a> has been implemented in a coastal <a href="/facts/Wetland/9abbP7CR">wetland</a> at <a href="/facts/Kooragang/k8tPWqLu">Kooragang Island</a> in <a href="/facts/Hunter_Estuary_Wetlands/shpYo6AY">Hunter Wetlands National Park</a>, <a href="/facts/Newcastle,_New_South_Wales/jJGEak0K">Newcastle</a>, <a href="/facts/Australia/qLHpbppq">Australia</a>.<a class="footnote-ref" id="fnref:118" href="#fn:118"><sup>118</sup></a> Due to the construction of <a href="/facts/Levee/99xdvoVg">levees</a> and internal <a href="/facts/Drainage/thEd3nfB">drainage</a> in the area during the 20th century, <a href="/facts/Tide/zNstvWPv">tidal water</a> was prevented from entering the wetlands. Although tidal flows were already reintroduced in the early 2000s, the site's <a href="/facts/Hydrology/Xh727cnE">hydrology</a> and <a href="/facts/Topography/SS8Bx4t9">topography</a> favoured the expansion of <a href="/facts/Mangrove/JreUUsuG">mangroves</a>. This created a situation in which mangroves expanded rapidly at the expense of other <a href="/facts/Salt_marsh/yV4Afzoj">saltmarsh</a> <a href="/facts/Vegetation/nAHr9kjk">vegetation</a>, resulting in a deeper tidal inundation similar to that experienced with sea-level rise.<a class="footnote-ref" id="fnref:119" href="#fn:119"><sup>119</sup></a> </p><p>To recreate desired natural tidal conditions, a strategy called the tidal replicate method was applied.<a class="footnote-ref" id="fnref:120" href="#fn:120"><sup>120</sup></a> The tidal replicate method creates an artificial tidal regime through an automated tidal control system which the authors call SmartGates. The gates manipulate the tidal flow reaching the <a href="/facts/Wetland/9abbP7CR">wetland</a> area and mimic the tidal conditions necessary to recruit and establish wetland vegetation. The site, which would have been inundated under natural conditions, has effectively re-established saltmarsh vegetation following the implementation of the novel method.<a class="footnote-ref" id="fnref:121" href="#fn:121"><sup>121</sup></a> Although the primary aim of this strategy is restoring saltmarsh vegetation, vegetation captures sediment and can therefore enhance natural <a href="/facts/Sedimentation/qUgHGvhd">sedimentation</a> processes. </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Beach_nourishment/jMnjpIBL">Beach nourishment</a></li> <li><a href="/facts/Coastal_sediment_supply/LFVlVRVK">Coastal sediment supply</a></li> <li><a href="/facts/Dam/BroJFhEI">Dam</a></li> <li><a href="/facts/Environmental_impact_of_reservoirs/skuUpJs6">Environmental impact of reservoirs</a></li> <li><a href="/facts/Soft_engineering/pWy4nUgs">Soft engineering</a></li> <li><a href="/facts/Stream_restoration/t8DJLknK">Stream restoration</a></li> <li><a href="/facts/Wetland_conservation/KJcTP9Ul">Wetland conservation</a></li> <li><a href="/facts/Intertidal_wetland/QHV8FPIY">Intertidal wetland</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Nicholls, R. J.; Hutton, C. W.; Adger, W. N.; Hanson, S. E.; Rahman, Md. M.; Salehin, M., eds. (2018). Ecosystem Services for Well-Being in Deltas: Integrated Assessment for Policy Analysis. Cham: Springer International Publishing. doi:10.1007/978-3-319-71093-8. ISBN 978-3-319-71092-1. S2CID 135458360. <a href="978-3-319-71092-1" target="_blank">978-3-319-71092-1</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Syvitski, J. P. (2008). "Deltas at risk". Sustainability Science. 3 (1): 23–32. doi:10.1007/s11625-008-0043-3. ISSN 1862-4065. S2CID 128976925. <a href="http://link.springer.com/10.1007/s11625-008-0043-3" target="_blank">http://link.springer.com/10.1007/s11625-008-0043-3</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Giosan, L.; Constantinescu, S.; Filip, F.; Deng, B. (2013). "Maintenance of large deltas through channelization: Nature vs. humans in the Danube delta". Anthropocene. 1: 35–45. 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