Author(s)

S.W. Schoombie, A. Cloot, A.J.H. Pieterse & J.C. Roos

Abstract

An algal growth model for the Vaal River S.W. Schoombie," A. Cloot," A.J.H. Pieterse,^ J.C. Roos& " Department of Applied Mathematics^ Department of Botany and Genetics, University of the Orange Free State, Bloemfontein, South Africa ABSTRACT A dynamic mathematical model was developed to simulate algal growth and algal blooms in the Vaal river in central South Africa. The model takes variations in the available light and water temperature into account, and, in the case of diatoms, also the dissolved silicon content. The model has been calibrated with available experimental data, and simulations of algal growth agrees well with observations. INTRODUCTION The Vaal river is situated in the central part of South Africa. It is not only an important source of water for domestic and industrial use, but it is also used as a pathway for the disposal of industrial and domestic wastes, leading to pollution and eutrophication of the river. Thus algal blooms occur frequently, cau

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