Spectacular currents at the Sand Motor
The Sand Motor is a coastal extension just south of The Hague in the Netherlands. Every year, the sea takes sand from the Dutch coast. Every five years, the Dutch government replenishes the shortfall of sand by depositing sand on the beaches and in the offshore area. The Dutch government is trying to find out whether nature can spread sand along the coast for us. Construction of the Sand Motor took place in 2011. Since then the government and researchers have performed an extensive monitoring programme. The Nortek SeaDarQ radar is giving valuable information as part of this programme. The radar position is slightly North of the main area of the Sand Motor.
The SeaDarQ system produce images and current vectors every 10 minutes. The four images below show the land (green), current vectors (yellow) and the sea surface (gray background) during the transition from flood to eb. Initially, left image, the flood current is strong with a whirl visible close to the hook of the Sand Engine. In the consequetive three images eb is coming in from the left with the current seam, caused by the difference of sea and brakish water, is clearly visible in the background. Researchers use the information to calibrate numerical models, which is otherwise quite difficult.
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