黄淮海平原河道基本环境需水研究

针对我国北方地区水环境中最突出的污染问题,以满足河流最基本的稀释自净功能为目的,提出了一种计算河道基本环境需水量的方法,即月(年)保证率设定法,并以黄淮海平原为例,进行实证分析。结果是黄淮海平原总的河道环境需水最小为2176亿m³,约占多年平均径流量的15%,其中海河流域309亿m³、黄河下游52亿m³、淮河流域片1347亿m³。通过Tennant法验证,说明计算结果可靠。本文的研究不仅丰富了生态(环境)需水的理论内涵,为河道生态(环境)需水的进一步研究打下了良好的基础,同时为研究区水资源规划、水环境保护提供了有力的依据

Study of the basic environmental water requirement of the rivers in Huang-Huai-Hai plain

In allusion to the most outstanding pollution problem of water resources in northern China, one calculating method of basic environmental water requirement of the rivers which can guarantee the river function of depuration and dilution is proposed, namely, the monthly (annual) guaranteed frequency method Under the precondition of different monthly (annual) guaranteed frequencies, this method takes the percentage of different natural annual mean discharge as the grade of environmental water requirement of the rivers with the help of series of hydrological statistical data, and the monthly (annual) basic environmental water requirement of the rivers is calculated individually under different guaranteed frequencies and different grades As a case the Huang Huai Hai plain of North China is analyzed Firstly, the main problems existing in the course of water resources utilization and water environment of research area are analyzed, and the main function of river system is confirmed Secondly, the current water utilization of rivers is evaluated with the criterion of Tennant method, and the results indicate that the average water consumption of the rivers in Huang Huai Hai plain in 1997 is shortage, and except that basin slice of Huaihe River belongs to "extremely good grade", the others all fall into the category of "worst" grade or "extremely bad"grade Thirdly, the basic environmental water requirement of the rivers in Huang Huai Hai plain was calculated using the method put forward in this paper, and the results showed that the minimum environmental water requirement of the rivers in Huang Huai Hai plain is 21 76 billion m³ , accounting for 15% of normal annual runoff In which, 3 09 billion m³ are for Haihe River basin, 5 2 billion m³ for the downstream of the Yellow River and 13 47 billion m³ for Huaihe River basin The results are verified through Tennant method, which proved that the calculation result is reliable The countermeasures and suggestions to meet the need of basic environmental water requirement of the rivers in research area are proposed finally The research of this article not only enriches the environmental water requirement theory, but also set up good foundation for further study of ecological (environmental) water requirement, and can offer effective basis for water resources planning and water environmental conservation for the research area at the same time