Sand Motor on the Move
<div><b>Radar</b></div><div>An Xband radar is stationed on the dunes near the sandmotor. Bursts of raw radar images are processed with in-house developped algorithm XMFit providing spatial data of bathymetry, current velocity, wave direction and wave length.</div>
<div><b>Useful vegetation: Mangroves</b></div><div>A mangrove forest not only offers coastal protection but in addition ecosystem services provided by healthy mangrove forests, such as enhanced fisheries and shellfish benefits but also the making of krupuk, paint and syrup, can contribute to the socio-economic prosperity of the surrounding communities. </div><div><br></div><div><b>What is the problem</b></div><div>Found worldwide in the tropics and subtropics, mangroves are disappearing at a rapid pace. This is mainly caused by anthropogenic pressures, such as land clearing for urban development or for establishment of fish and shrimp ponds in more rural areas. </div><div><br></div><div><b>Indonesia</b></div><div>We are currently testing the effectiveness of bamboo permeable dams along the North coast of Java (Indonesia). This work is conducted under the Ecoshape Building with Nature program. </div><div><br></div><div>More information: <a href=""></a></div><div><br></div>
<div><span style="font-size:16px;"><b>Shoreface and intertidal beach area</b></span></div><div>The sand spit, the rapidly changing sand banks and the lagoon are landscapes that were absent on this part of the Dutch coast previously. The Sand Motor has therefore led to an increase in the number of different habitats for benthos, birds and fish. </div>
<div><b>Reinforced zeedijk</b></div><div>The Hondschbossche zeewering, a 5.5 km long coastal barrier (zeedijk) situated at the Dutch coast between Camperduin and Petten needed to be reinforced because of the continuing erosion of the adjacent dunes.</div><div>Recently it was reinforced with 35 million m3 of sand.</div><div><br></div><div><b>Comparable to Sand Motor</b></div><div>The new beach and dunes are designed as innovative coastal protection according to the new safety standards and ecological and recreational benefits are expected.</div><div><br></div>
<div>The animation show how the tidal flows are affected by the Sand Motor. The flow contraction and the occasional eddies in combination with wave action cause sand to be transported away from the Sandmotor, thus gradually feeding the adjacent coastal sections.</div>
<div><b>Usability other Dutch coastal regions</b></div><div><br></div><div>Deltares reported on the usability of the Sand Motor for other coastal regions in the Netherlands. In terms of coastal management, sand motors are particularly suitable along the straight parts of the Wadden coast and, locally, the coast of the provinces of South and North Holland.</div>
<div><b>Hurricane Katrina</b></div><div>After the devestating impact of hurricane Katrina the aim was to restore the sediment budget, including littoral zone geologic processes around Ship, Horn, and Petit Bois islands, to their natural state as much as possible. </div><div><br></div><div><b>Sediment transport model</b></div><div>A sediment transport model was conducted to establish a current sediment budget for the islands. This study evaluated the existing regional sediment transport magnitudes and directions for the Mississippi and Alabama barrier islands fronting Mississippi Sound including daily conditions and hurricanes.</div><div><br></div><div><b>Conclusion</b></div><div>It was concluded that the restoration efforts would provide a more resilient island in the face of future hurricane events. </div><div><br></div><div>More <a href="">information</a>.</div><div><br></div><div><br></div>
<div><b>Deep part of the lagoon</b></div><div>The deep part of the lagoon had little ecological value in 2015 as a result of the limited exchange of water with the North Sea</div>
<div><span style="font-size:16px;"><b>New dune area / dry beach </b></span></div><div>In broad terms, ecological values have benefited from the construction of the Sand Motor. However, the area covered by newly formed dunes is, at less than one hectare, still very modest in absolute terms. Locations with planted marram grass evolved quickly in the more valuable ‘white dunes’. The process of dune formation, which was left entirely to nature and therefore proceeding relatively slowly in the start, will accelerate now, after a period in which only few patches developed.</div>
<div><span style="font-size:16px;"><b>Existing dune area (Solleveld)</b></span></div><div>The effects of the Sand Motor on the existing nature reserve Solleveld is limited. The total dynamic area remained approximately the same and significant effects of a changed influence of the sea were limited. No clear changes have emerged in terms of the quality of the habitats.</div><div><br></div>
<div><span style="font-size:16px;"><b>Safeguard swimmer safety</b></span></div><div>A mobile application has been developped to support the beach patrol in controlling the swimmer safety at the Sandmotor. The application presents model-based predictions of current velocities and beach width, as a function of the tide, waves and wind. </div><div><br></div>
<div><span style="font-size:16px;"><b>Escape busiest part of our country</b></span></div><div>The Sand Motor is an open area for people to visit and leisure. With its dunes, lagune and wide beach it is a worthwhile location to escape the busiest part of our country. However twice a day tides, waves and currents bring the water on to the Sand Motor. This dynamic behaviour sometimes arises quicksand or strong currents in the water. Visitors are warned with signs and emergency services stay alert. </div>
<div><b>Silt Motor</b></div><div>300,000 cubic meters of silt from the harbor of Harlingen is used to stimulate the growth of salt marshes in at Koehoal, on the Friesian coast. Salt marshes are not only vital for salt marsh plants and wading birds but also provide protection against sea level rise due to climate change. During the experiment, a team of experts from Wageningen University and Research, Deltares, Arcadis, Royal Haskoning DHV, Van Oord, NIOZ and TU Delft moving the sludge and explore the salt marsh accretion.</div>
<div><b>Argus</b></div><div>Two Argus video stations continuously monitor the morphological evolution of the Sandmotor. As data collection is automatically performed, the operation is cost-efficient, enabling the technique to be competitive to the traditional survey methods of beach bathymetry and shoreline. The animation shows the impact on the Sandmotor of a storm event in November 2013.</div>
<div><span style="font-size:16px;"><b>Mitigate erosion</b></span></div><div>Long-term prediction of the Sandmotor after about 25-50 years which shows that the adjacent coasts benefit from the sand supplied by the Sand Motor.</div>
<div><span style="font-size:16px;"><b>Sea sandwort</b></span></div><div>New nature is growing on the Sand Motor. For instance Sea Sandwort (picture). But also the Critically Endangered Sea Holly has been spotted. </div>
<div>The Sand Motor is also monitored by jetski. The Delft spin-off company Shore Monitoring uses a jet ski equipped with sonar technology to investigate the nearshore morphology up to the edge of the coastline.</div>

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