الفهرس 
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Abstract
There are five lagoons along the north coast of Egypt. These lagoons are Maryout, Edku, Burullus, Manzala, and Bardawil. They have great economic values because they act as harbors for fishing boats and play significant role in the regional economy. These lagoons were providing about 60% of Egypt’s total fish production, according to the statistics of the Egyptian Ministry of Agriculture. Egyptian coastal northern lakes suffered from various problems, which might lead to environmental degradation, shortage in fish catch and substantial changes in its ecosystem. Burullus Lake is the second largest of the Egyptian northern lakes along the Mediterranean coast. The environment of Burullus Lagoon has witnessed the significant change during the last three decades as many drains were constructed to convey agricultural wastes into the lagoon. Many complex physical and Eutrophic measured data during 10 years (temperature, pH, salinity, dissolved oxygen DO, BOD, ammonia NH3-N, nitrite-nitrogen (NO2-N), nitrate-nitrogen (NO3-N), PO4-P, silicate (SiO4) and Chlorophyll-a (Chl-a) were analyzed by using multivariate statistical techniques, analysis of variance annova one-way and water quality index (W.Q.I). According to the analysis results Burullus lake were divided to seven zones (zone 1, zone 2,… zone 7). Significant seasonal changes (p < 0.05) were observed in temperature, pH, whereas significant spatial differences (p < 0.05) were detected in pH, salinity, DO, BOD, NH3-N, NO2-N, NO3-N, PO4-P, SiO4& Chl-a. The water quality index (WQI) of the lake was rated as “Bad” to “Very bad”. A MIKE21 model was developed to provide a recommendation scenario that could be used to enhance the water quality of Burullus Lake. By improving the water quality of precise drains (namely drains 7 and 8), and make baffles in the lake to reduce the eutrophic parameters. The results show that the WQI at Zone4 and Zone6 modified from “Bad” to “Medium” and the lake can be convert from eutrophic to oligotrophic type.