基于MIKE11模型的长河动态水环境容量分析

Analysis of Dynamic Water Environmental Capacity of the Changhe River

为探究水环境容量的动态特征,明晰非感潮河流水体的污染治理方法,选取山西长河为研究水体,针对COD和氨氮两种污染物,采用MIKE11模型与传统一维水质模型法对比分析水环境容量计算结果。结果表明:1)MIKE11模型法下月均水环境容量史村断面COD为7.59g/s、氨氮为-0.09g/s;双河底断面COD为6.54g/s、氨氮为-0.11g/s;川底断面COD为20.89g/s、氨氮为0.21g/s;石淙头断面COD为19.63g/s、氨氮为1.11g/s。与一维水质模型相比展现出明显的动态特征;2)MIKE11模型法能更好的考虑水质现状、水文要素和排污情况等综合因素对河流水环境容量的影响,计算精度更高;3)丰水期水环境容量最大,枯水期水环境容量最小,其大小与流量流速等水文要素有着密切的关系。研究可为长河水环境保护与治理提供新的思路。

In order to investigate the dynamic characteristics of the water environmental capacity and clarify the pollution management methods of non-tide sensitive river water bodies,the Shanxi Changhe River was selected as the study water body,and the MIKE11 model was used to compare and analyze the water environmental capacity calculation results with the traditional one-dimensional water quality model method for both COD and ammonia nitrogen pollutants.The results showed that:1)the monthly average water environment capacity under the MIKE11 model method is 7.59g/s for COD and-0.09g/s for ammonia nitrogen at the section of Shicun;6.54g/s for COD and-0.llg/s for ammonia nitrogen at the section of Shuanghedi;20.89g/s for COD and 0.21g/s for ammonia nitrogen at the section of Chuandi;19.63g/s for COD and 1.llg/s for ammonia nitrogen at the section of Shigongtou.Compared with the one-dimensional water quality model,it shows obvious dynamic characteristics;2)the MIKE11 model method can better consider the current water quality,hydrological elements and discharge situation and other comprehensive factors on the river water environmental capacity,and the calculation accuracy is higher;3)the water environmental capacity is the largest in the abundant water period,and the smallest in the dry water period,and its value is closely related to the flow rate and other hydrological elements.The study can provide new ideas for water environmental protection and management of the Changhe River.