TAILIEUCHUNG - Báo cáo " Estimation and prediction of eutrophication in West Lake"

The water quality of lakes in Hanoi has been declining. In that, eutrophycation is the most popular. One of the effective tools for its accessing and predicting is the use of mathematical models. This paper used the Vollenweider model, Empirical watershed model and Jorgensen model to determine the eutrophycation of West Lake by Phosphorous concentration in the lake water. The results given by the models show that the ability of Eutrophication of West Lake is very high, because the content of Phosphorous in the lake exceed allowable value of standard () many times. The results of Jorgensen model are:. | vnu journal of science earth sciences n0i 2007 estimation and prediction of eutrophication in west lake Luu Lan Huong Do Kim Anh Truong Tuan Anh College of Science VNU ABSTRACT. The water quality of lakes in Hanoi has been declining. In that eutrophycation is the most popular. One of the effective tools for its accessing and predicting is the use of mathematical models. This paper used the Vollenweider model Empirical watershed model and Jorgensen model to determine the eutrophycation of West Lake by Phosphorous concentration in the lake water. The results given by the models show that the ability of Eutrophication of West Lake is very high because the content of Phosphorous in the lake exceed allowable value of standard l many times. The results of Jorgensen model are P 13132-18894kg year rainy season P 9450-23580kg year dry season and the results of Empirical watershed model are P l rainy season P mg l dry season . Thus the results of the two models are similar and close to the results measured in the field. The prediction results of the eutrophication of West Lake by Jorgensen model are simulated by Software Stella II which showed that the eutrophication in West Lake could be controlled by reducing waste sources to the lake and raising amount of fishes. 1. Introduction Eutrophication is the aging process by which shallow lakes gradually become dry land because of the accumulation of sediment and organic material. Nutrient enrichment contributes to the process as it causes excessive growth of algae and aquatic plant. Under natural conditions this aging process occurs over geologic time CETIA 2005 . However the process can be greatly accelerated by human activities in watersheds. To save the lake ecosystem there is a need of estimation and prediction of eutrophication. One of effective tools for accessing and predicting is the use of mathematical models. 2. Research objects and methods . Research objects Located in Hanoi .

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