Abstract
The accurate prediction of dissolved oxygen (DO) in lakes specially in eutrophic lakes is of paramount importance in view of the water quality. The temporal and spatial variations of DO in the lake Calhoun is studied with the aid of a numerical model. When the water quality is found to be highly degraded, the DO depletion may cause fish kills and anoxic conditions for other living organisms in the ecosystem. The main factors that affect the DO budget are temperature and organic matters present. Computational values and measured values of DO are compared. The model predicts that at the surface, reaeration is predominant whereas photosynthesis and algal respiration contribute considerably.For the management point of view, it is useful to predict water quality in terms of DO, thereby, if necessary, remedial measures such as artificial aeration can be adopted to improve the water quality. The model prediction also provides an idea about the period during which an improvement is necessary without extensive costs.
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