Research On Effect And Regulation Of Dam On Water Quality And Quantity Of Polluted Rivers

Construction of dams on rivers is an important means of developing and utilizing water resources. With continuous economic and social development, a mount of dams projects can promote the development and utilization of water resources, while also bring a series of environmental problems in the rivers. It has become a research focus in the international hydrological and ecological field about how to ease the negative impact on water environment through scientific regulation for dams. A great many dams projects have been built in main streams and tributaries of Huai River in China, so that the vast industrial wastewater and domestic sewage are often accumulated, and can easily lead to concentration of pollution discharge and even water pollution emergencies. Therefore, research on mechanism and quantitative modeling of Dams on water quality and quantity of polluted rivers, and proposition of anti-fouling regulation in practice are the keys to prevent water pollution emergencies in Huai River basin and also the research focus of this paper, which is of great theoretical and practical significance.Based on the regulation test of Huaidian dam carried out in the Shaying river of Huai River Basin, this paper summarized both domestic and foreign research status and problems, and built the Hydrodynamic-water quality model under the function of dams to study the effect on polluted river. Through analyzing the effect of dams on water quality and quantity in the polluted river, it proposed regulation strategies of a single dam and dam groups. Finally, combing with dams joint defense aiming at the pollution carried out by Huai River, the paper established the anti-fouling regulation model and applied this method to the largest tributary Shaying River of Huai River, which is seriously polluted. In this regard, the chief research contents are presented as follows:(1) Temporal and spatial variation analysis and evaluation of water quality in Huai River. Water quality data of30monitoring sections in Huai River from2003to2010were collected, and the methods of multivariate statistical and Mann-Kendall non-parametric test were used to analyze and evaluate the water quality temporal and spatial variation in Huai River.(2) Research on hydrodynamic-water quality model under the effect of dams in polluted rivers. The paper carried out the regulation experiment of dams, and then constructed the hydrodynamic-water quality model by collected data, meanwhile tested and verified the model reliability.(3) Effect study of dams on quality and quantity of polluted rivers. Carrying out multi-scenario simulation, and the paper analyzed the effect of a single dam and dam groups on quality and quantity of polluted rivers according to the simulation result, respectively, and put forward the regulation strategy for polluted rivers.(4) Anti-fouling regulation research of dams in polluted rivers. It delimited the concept and connotation of dam anti-fouling regulation in polluted river, built dams anti-fouling water lever prevention model and dam groups anti-fouling regulation model, and used multi-objective genetic algorithms and fuzzy optimization as well as other methods to solve the model. Finally it researched dam’s antifouling restrictions water levels and dam groups’control and optimization solutions, and applied this to Shaying River.(5) System software of dam anti-fouling regulation for Shaying River. It used C#, object-oriented, released by Microsoft as a development tool and developed anti-fouling regulation service system software directly for Shaying River sites, providing technical support for Huai River water pollution control and the basis for developing dams regulation plan for all levels’ dams management and water management departments.