【摘要】 运用澳大利亚西澳大学水研究中心开发的DYRESM-CAEDYM模型对2005年太湖水质进行了模拟,确定了一套可应用于太湖水质模拟的参数,并进行了模拟结果的验证;模型对水温模拟结果较好,总氮(TN)、总磷(TP)以及藻类浓度全年模拟的总体变化趋势与实测相一致。同时运用该模型对污染控制效果进行评估,从清淤、调水以及控制入湖河流污染负荷这3种措施在太湖水质改善中的效果的比较来看:这3种方案使年底TN质量浓度分别下降了16%、6%和30%;TP质量浓度分别下降了4.6%、4.1%和31.8%;藻类质量浓度的峰值从61.01μg/L下降到55.79、55.92和52.99μg/L,另外藻类质量浓度超过Ⅳ类水(30μg/L)的天数分别从88 d下降到44、81以及43 d。清淤(CASE-1)和入湖河流能控制在Ⅳ类水(CASE-3),两者效果均好于调水(CASE-2)。今后将运用DYRESM-CAEDYM模型模拟综合实施多种措施下的水质改善效果,为太湖水质管理以及藻类水华暴发的预警方法进行进一步的探索。更多还原

【Abstract】 Based on the DYRESM-CAEDYM model developed by Centre for Water Research,the University of Western Australia,this thesis simulates the water quality of Taihu Lake in 2005,settles a set of parameters applicable for the simulation,and validates the simulation result.The water-temperature simulation result is rather satisfactory,which indicates that the all-year simulated fluctuation of TN,TP and algal concentration agrees with the measured data.Furthermore,this thesis applies the model in the evaluation of pollution control effectiveness,comparing the three measures—sediment clearance,water re-distribution and inflow pollution control—in their effect of water-quality melioration of Taihu Lake.According to the comparison,TN concentration declines respectively by 16%,6% and 30%;TP concentration declines respectively by 4.6%,4.1% and 31.8%;peak algal concentration declines from 61.01 μg/L respectively to 55.79,55.92 and 52.99 μg/L;and the number of days in which algae concentration exceeds Level IV(30 μg/L) declines from 88 respectively to 44,81 and 43.Sediment clearance(CASE-1) and inflow pollution control(CASE-3) enable Taihu Lake’s water quality to stay in Level IV,which is better than water re-distribution(CASE-2).The DYRESM-CAEDYM model would be implemented in the simulation of water-quality amelioration effectiveness with multiple control measures in the future,and more research would be made on the method of the pollution control and the fore-warning of the cyanobacteria blooming of Taihu Lake.更多还原