Simulation Of Water Quality In The Shanmei Reservoir Based On CE-QUAL-W2Model

Shanmei Reservoir is drinking water source for Quanzhou city, the water quality survey of2003～2010show that the averaged comprehensive trophic level index is40.8, indicating that the reservioir was mesotropher. The CE-QUAL-W2model was applied to further study the distribution law of water quality in longitudinal and the vertical direction, and analyze the relationship between the nutritional status and variation of total nitrogen conxentration. The model can be used for simulating spatio-temporal distribution of water level, water temperature, dissolved oxygen, ammonia, nitrate nitrite, total nitrogen and phosphate. The results are summarized as follows:1. CE-QUAL-W2hydrodynamic water quality model was established for Shanmei Reservoir, water level and water quality constituents can be simulated well, and the simulation error of water level was the smallest.2.The change of water quality elements was significant during the year. Water temperature and the concentration of ammonia were low in summer and high in winter, dissolved oxygen concentration first decreased and then increased, nitrate-nitrite and total nitrogen has stabilized, the phosphate concentration increased in winter.3.The vertical differentiation of the water quality elements including water temperature(T), dissolved oxygen(DO), ammonia(NH3-N), nitrate-nitrite(NO3’-NO2-), total nitrogen(TN) and phosphate (PO43-)was larger in spring, and smaller in other seasons.4.In spring, T and the concentration of DO, NH3-N and TN reduced with the increase of depth. T, DO and NH3-N reduced with the increase of depth, NO3--NO2-and TN first decreased and then increased in summer. T, DO, NH3-N, NO3--NO2-and TN reduced with the increase of depth in autumn. T, DO, NH3-N, NO3--NO2-and TN stabilized with the increase of depth in winter.5.The TLI of Shanmei reservoir was38.7for2008,39.7for2009, indicating that the reservoir was mesotrophic, In the validation period, total nitrogen nutrition index was more than70, indicating that the reservoir was in heavy eutrophication.