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

TL;DRAbstract

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. In 2010 this nourishment has been eroded almost completely. The processes that drive this ongoing high erosion are not known; therefore two research questions have been defined: (i) What happened to the nourished sand, where has it been transported to? and (ii) Which processes cause the high erosion rate at Kololi Beach? To gain insight in the coastal processes in front of the Senegambia area field data have been collected and analysed, the nearshore wave climate has been modelled using SWAN and sediment transport capacities and shoreline movements along the coast have been computed using DHI software. The most important results are: Nourished

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