Dynamic water environment capacity of river network in Jiangnan Plain based on MIKE11 model
Water environment capacity calculated using traditional methods has limitations such as single hydrological calculation conditions and fixed calculation results,as the low water flow rate is normally designed at a 90％guarantee rate.Thus,the traditional methods cannot well characterize the water environment capacity of Jiangnan Plain river network which is with unpredictable flow directions,complicated hydrological processes,and dispersed pollutants.Aiming to help reveal the dynamic characteristics of water environment capacity of river network in Jiangnan Plain,this study took the river system of Guanlin Town,Yixing City as an example to calculate the water environmental capacity of the river network control unit based on the MIKE 11 water quality model.The results were that an obvious dynamics was observed for the water environment capacity via the MIKE1 1 model method and the monthly average water environment capacities were-152.80 t for COD,0.92 t for ammonia nitrogen and-1.69 t for total phosphorus in Guanlin control unit,220.23 t for COD,4.49 t for ammonia nitrogen and 1.45 t for total phosphorus in Tongzi control unit;and 15.42 t for COD,0.90 t for ammonia nitrogen and 0.14 t for total phosphorus in Huangxin control unit,respectively.The water environment capacities of the representative rivers were closely related with the flow velocity and other hydrological elements,for example,the urban rivers with a standard water quality exhibited a positive correlation between the water environment capacity and the flow velocity,but the rural rivers with a water quality not up to standards showed a contrary pattern.This study can provide an important reference and new ideas for the water environment protection and management of the plain river network.
MIKE11dynamic water environment capacityplains river network
国家科技期刊平台
NSTL
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