应用RCA模型对桑沟湾水质的模拟研究

Simulation of water quality research of Sanggou Bay using RCA

在ECOM水动力模块正确模拟桑沟湾海域潮流场的前提下,利用美国RCA(Row Column AESOP)水质模型模拟了桑沟湾的水质状况,模拟结果表明:污染物浓度在水平方向上,由沽河入海口向外大体呈递减趋势;垂直方向上,CODMn由表至底浓度逐渐降低,但差异较小;DIN、DIP由表至底浓度逐渐降低,底层浓度略有升高。该模拟结果与水质监测数据进行了对比,对比结果显示各水质指标的最大相对误差分别为:CODMn为11.19%,DIN为13.20%,DIP为14.81%。模拟结果与监测数据基本一致。由此可见,RCA水质模型能较好的模拟桑沟湾水质状况,因此,该模型可应用于桑沟湾的水质预测,并可为桑沟湾水质管理、入海污染物总量控制提供依据。

Under the premise that ECOM simulates Sanggou Bay＇s current correctly,the simulation was put forth on the water quality of Sanggou Bay using RCA.The simulation results show that the horizontal pollutant concentration is decreased from the estuary to the waters,and the vertical concentration of CODMn is gradually reduced,but the differences is small,and concentration of DIN、DIP are decreased from the surface to the bottom,and concentration in bottom is slightly higher.Compared with the observation,the maximum relative error of each indicator is as follows： CODMn,11.19%,DIN,13.20%,DIP,14.81%,which is consistent with the observation.The results from the simulation,the RCA model is correct,and is feasible in Sanggou Bay.So it may provide the evidence for the management of marine environment quality,and the total mass control of pollutants in Sanggou Bay.