TAILIEUCHUNG - Báo cáo " Eutrophycation assessment and prediction of Bay Mau Lake using mathematical models "

The lake ecosystem of Hanoi has a very important role. However, the water quality in the lakes of Hanoi is declining; they're more and more polluted. Among that, eutrophication is the most popular one. Therefore, the assessment and prediction of eutrophication is necessary. One of the effective tools for assessing and predicting eutrophycation is the use of mathematical models. In this paper, we used the Vollenweider model, empirical watershed model and Jorgensen model to determine the eutrophycation of Bay Mau Lake by phosphorous concentration in the lake water. The results show that Bay Mau Lake is being heavy eutrophication,. | VNU Journal of Science Earth Sciences 23 2007 116-121 Eutrophycation assessment and prediction of Bay Mau Lake using mathematical models Luu Lan Huong Trinh Thi Thanh Nguyen Thi Thanh Nga College of Science VNU Received 22 December 2006 Abstract. The lake ecosystem of Hanoi has a very important role. However the water quality in the lakes of Hanoi is declining they re more and more polluted. Among that eutrophication is the most popular one. Therefore the assessment and prediction of eutrophication is necessary. One of the effective tools for assessing and predicting eutrophycation is the use of mathematical models. In this paper we used the Vollenweider model empirical watershed model and Jorgensen model to determine the eutrophycation of Bay Mau Lake by phosphorous concentration in the lake water. The results show that Bay Mau Lake is being heavy eutrophication soluble phosphorus concentration is very high l other phosphorus concentrations is increasing. We had treated phosphorus concentration of sewage before loading to the lake. When Cpl decreases up to 90 the content of PS fluctuates between and l. This value is much higher than the allowable limit l . The results of this paper can serve as a base for developing a strategy for protection and sustainable use of valuable water resource. Keywords Eutrophycation Lake ecosystem Mathematical models Bay Mau Lake. 1. Introduction In the recent years Hanoi s economic growth rate has increased substantially. The development on the other hands causes many consequences. One of these is that the pollution of the lake ecosystem has increased at an alarming level and the water quality has been declining. Among those eutrophycation is the most popular. Eutrophycation is a phenomenon caused by excess of nutrients mainly nitrogen and phosphorus which is reflected in the booming of living algae particularly the phytoplankton. Corresponding author. Tel. 84-4-5584921. E-mail huongjgep@ This .

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