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Sand transport under broken waves

The surfzone is characterized by breaking waves and bores, which inject large amounts of turbulence into the water column. This turbulence is organized in vortices, that travel downward towards the bed. When these vortices reach the bed, they can entrain sand and hold it in suspension. This contrasts strongly with the situation in deeper water, where the near-bed orbital motion is the main source of sand suspension.

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Morphologic evolution of a mega-nourishment

Worldwide along several sandy beaches coastal erosion is a serious threat when the hinterland is densely populated or cultivated. The hinterland can be protected by taking hard engineering measures (e.g. groins or piers), but also by co-called soft engineering solutions like nourishing the near-shore or the beach with sand. Normally such nourishments protect against coastal retreat for several years, but are no long term solution.

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Water levels and discharge in the Rhine and Meuse

The Rhine-Meuse channel network is an example of a river system that has been severely altered by human interventions. Already since the Middle Ages, humans have changed the location of branches and the distribution of discharge. Today, it is a heavily engineered system, with extensive harbor areas and a fully closed-off estuary in the south, the Haringvliet. Luckily, as a result of the high anthropogenic pressure on the system, a lot of monitoring data is available, for example on water levels or salinity intrusions.

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Mosselwad

Introduction Mussel beds are important biogenic structures in the intertidal and subtidal environment of the (Dutch) Wadden Sea. Mussel beds are partly …

anime

Crescentic sandbar behaviour

Introduction Nearshore sandbars (alongshore ridges of sand, located in 2 – 10m water depth, typical of micro- to mesotidal coasts) often exhibit …

Berauland

Berau Land

Introduction The Berau river (Figure 1), East Kalimantan, Indonesia, discharges substantial amounts of water and sediment into the coastal zone. The river …

hijmaconstruction

Rhine-Meuse valley transgression

Introduction During the last glacial, the Weichselian, incised-valleys systems formed as a result of low sea levels (up to 120 m lower …