Year: 2012
Type: article
Abstract: Beach-head erosion of sandy beach plains in eastern Africa threatens \ntourism-related infrastructure and the livelihoods of beach users. The nature and \ndrivers of physical shoreline change at Kunduchi, Dar es Salaam, and Bamburi, \nMombasa, are described with analyses of beach sand transport through the annual \nmonsoon cycle and the provenance and sustainability of the beach sand supply. \nTime-series records of wind-vectors at Dar es Salaam and Mombasa show similar \naveraged patterns. Because of the contrasting alignments of these coasts, the net \nwind-wave driven longshore transport at Kunduchi (trending NNW) is northnorth-westwards, \nwhile at Bamburi (trending NNE) there is little net transport. At \nBamburi, the beaches are recharged with reef/platform-derived calcium carbonate \nsand and siliciclastic sand discharged from the hinterland via tidal channels. At \nKunduchi, recharge comprises mostly river-borne siliciclastic sand, but riverine \nsand mining threatens natural replenishment, jeopardising beach maintenance. \nEroding beach plain deposits contribute siliciclastic sand at both sites.
Language: English
Topic: Coastal and Marine Dynamics
Subfield: Earth-Surface Processes
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1484888682