The cause of coastal erosion on a nourished beach in Kololi, The Gambia

The erosion problem at the Senegambia area (The Gambia) is the subject of this thesis. The Senegambia area is the largest Tourism developed area which contributes significantly to the economy of The Gambia. In November 2003 Royal Haskoning has constructed a beach nourishment of 1,000,000 m3 as an erosion buffer with a lifetime of 10 to 15 years....

Long-term morphological modelling of the mouth of the Columbia River

With the construction of a process-based long-term morphological model (Delft3D) for the Mouth of the Columbia River (MCR), a first approach is made in trying to simulating the long-term morphodynamics of the MCR. Focus is on simulating the observed morphological changes for the post-jetty period of 1926-1958. The model is supplied with a high...

Extraction Force Xbloc: Model Tests

This report describes the influence of the slope angle of a breakwater slope, the density of the concrete of the Xbloc armour unit, the vertical position of the Xbloc on the breakwater slope and the roughness of the under layer of the breakwater on the extraction force of an Xbloc armour unit. By testing the extraction force, indirectly the...

A fundamental study of the Morphological Acceleration Factor

Long-term prediction of sediment transport and morphology has become increasingly important. One of the key issues in carrying out long-term modeling is to bridge the gap between short-term hydrodynamics varying from hours to days, and morphological changes, taking place over much longer periods. Lesser et al. (2004) and Roelvink (2006) have...

Aeolian transport on beach based on field measurement on the Dutch coast

During the winter 2009, beach and dune nourishments have been executed at Vlugtenburg (Holland coast) in order to reinforce the coastal defense. Natural processes such as wind and waves are expected to take care of effective and efficient redistribution of the sand throughout the system. The present study is part of the sub-project Monitoring...

Analysis of the Carbon Footprint of Coastal Protection Systems

Carbon Footprinting is a method of determining the environmental impact of a product or service. It focuses only on pollutions to the air by greenhouse gasses. There is a strong focus on these gases caused by intergovernmental alliances that restrict the amount of emitted gas. These agreements have been made, as a result of the widely accepted...

The influence of an Ecobeach PEM on beach development

Since the end of 2006 in the Netherlands a test is going on with a passive beach drainage system called Ecobeach. The system consists of vertical draining tubes with a length of 2.0 m called PEMs (Pressure Equalizing Modules). Under the surface level, every 100 m a row of PEMs is installed between the high and low waterline. Ecobeach is a Danish...

A Numerical Study on Design of Normal and T-Head Coastal Groins

Groins are old and intuitive means of reducing erosion and are found along the coast worldwide, although according to CEM (Coastal Engineering Manual 2003), “they are probably the most misused and improperly designed of all coastal structures”. The original purpose of groins was to reduce local erosion, that is, to hold the width of beach in...

Comparison of sea wave measurements using HF Radar and numerical model (IllSW A) hindcast

The study of waves and current, especially in the nearshore region is of particular importance for nearshore or coastal works. During the last decades, the formulations to describe the wave propagation as the waves move towards the shore has advanced very much. Many operational models for the hindeast and forecast of waves have been developed....

Analyse van het JARKUS-bestand rond Egmond aan Zee

In deze studie is geprobeerd om een verklaring te vinden voor een opvallend erosiesedimentatie- patroon rond Egmond aan Zee, in het kustvak tussen raai 30.25 en raai 46.00. Wanneer de mate van kustvooruitgang en kustachteruitgang langs de kust wordt uitgezet blijkt een golfachtig patroon op te treden met een kenmerkende golflengte van ongeveer 2...