摘要
本文根据马鞍山市慈湖河流域水环境现状,结合当地政府对慈湖河的管理整治目标,选择EFDC水动力-水质模型作为慈湖河水环境模型。并根据慈湖河流域整体情况对时间空间进行概化。时间概化上,最终确定水动力学模拟时间步长为10s,水质模拟时间步长为20s;空间概化上,采用凸四边形网格概化,各网格之间为一维线性关系;通过CAD、GIS软件,将河道划分为106个网格,共计86行、24列,建立二维模型。通过研究参考文献及相似案例,最终确定本模型的参数和取值。将参数值输入程序中,对慈湖河流域2013年水质进行模拟计算。与马鞍山实际数据比对后发现,模型输出的水位、流速、水质结果在合理范围内。表明在慈湖河干流建立二维水质污染扩散模型,具有较高的拟合、预测精度和泛化能力,模型及方法可为相关水质预测研究提供参考。此外该模型可与web应用系统集成,应用于水质预警,模拟不同污染负荷情形下水质变化,模拟污染事故发生后不同应急措施对污染情况的改善效果,为污染控制和水环境管理工作提供科学依据。
According to the current water quality in Cihu River Basin in Maanshan City,combined with the local government measures for Cihu River,we chose the EFDC hydrodynamic-water quality mode,and got the time generalization coefficient and the spatial generalization coefficient for this model.The time step for hydrodynamic simulation was 10s,and the water quality simulation is 20s.For the spatial generalization,we used the convex quadrilateral mesh generalization method,and the linear relationship among the grids was one-dimensional.We use CAD and GIS software to build a two-dimensional model for the river,dividing the river into 86 rows and 24 columns,for a total of 106 grids.After studying a large number of references and similar cases,we finally determined the parameters of this model,and used these parameters to simulate the water quality of the Cihu River Basin in 2013.After comparing with the actual data of Maanshan,we found that the water level,flow rate and water quality result of the model were reasonable.It proved that the model had high fitness,high prediction accuracy and high generalization ability.This method could provide reference for water quality prediction research in the future.In addition,the model could also be integrated with web system,applied to water quality warning,simulate water quality changes under different pollution load situations,simulate the improvement effect of different emergency measures on pollution after the occurrence of pollution accidents,and provide scientific basis for pollution control and water environment management.
作者
邵世保
吴雁
张德辉
耿永辉
周鹏
郝红珊
Shao Shibao;Wu Yan;Zhang Dehui;Geng Yonghui;Zhou Peng;Hao Hongshan(Maanshan Environmental Information Center,Maanshan Anhui 243000,China;Beijing Idea Innovation Technology Co.,Ltd.,Beijing 100085,China)
出处
《环境与发展》
2020年第2期103-105,109,共4页
Environment & Development
关键词
EFDC模型
二维水质污染扩散模型
模型集成
水质预警
慈湖河
EFDC Model
Two-dimensional water pollution diffusion model
Model integration
Water quality warning
Cihu River
