Beach Sand Supply and Transport at Kunduchi in Tanzania and Bamburi in Kenya
Loading...
Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Beach-head erosion of sandy beach plains in eastern Africa threatens
tourism-related infrastructure and the livelihoods of beach users. The nature and
drivers of physical shoreline change at Kunduchi, Dar es Salaam, and Bamburi,
Mombasa, are described with analyses of beach sand transport through the annual
monsoon cycle and the provenance and sustainability of the beach sand supply.
Time-series records of wind-vectors at Dar es Salaam and Mombasa show similar
averaged patterns. Because of the contrasting alignments of these coasts, the net
wind-wave driven longshore transport at Kunduchi (trending NNW) is northnorth-westwards,
while at Bamburi (trending NNE) there is little net transport. At
Bamburi, the beaches are recharged with reef/platform-derived calcium carbonate
sand and siliciclastic sand discharged from the hinterland via tidal channels. At
Kunduchi, recharge comprises mostly river-borne siliciclastic sand, but riverine
sand mining threatens natural replenishment, jeopardising beach maintenance.
Eroding beach plain deposits contribute siliciclastic sand at both sites.
Description
Keywords
Beach sand, Longshore drift, Kunduchi, Bamburi, Monsoon, Shoreline change
Citation
Onganda, H., Nyandwi, N., Mburu, J.W., Ochiewo, J., Uku, J., Arthurton, R.S., Sanga, I., Magori, C. and Shaghude, Y.W., 2012. Beach Sand Supply and Transport at Kunduchi in Tanzania and Bamburi in Kenya.