PREVENTING NATURAL BREACHING OF THE MAJOR SAND SPIT PROTECTING THE PORT OF WALVIS BAY

J.S. Schoonees, L. Lenhoff, A.J. Raw

Abstract


During seasonal storms, waves wash over the major peninsular sand spit protecting the Port of Walvis Bay. The possibility of breaching of the spit was assessed and conceptual measures were proposed to prevent breaching. Aeolian, longshore and cross-shore sand transport rates were computed. Modelling was done of beach profile changes during storms. It was found that the spit would probably not be breached during a single storm. Sand nourishment, methods to prevent erosion, and methods to induce accretion in vulnerable areas were considered to prevent breaching. A contingency plan was recommended involving the use of low-cost shore protection.

Keywords


natural beach; breach; spit; Walvis Bay; port

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