Simulation And Ecological Treatment Of Urban Runoff Based On Total Quantity Control

Recently,as the control efforts continued to strengthen and management system improving, point source pollution control has been very significant results in China.However,the prevention for non-point source pollution is still in the exploratory stage and the control measures are rather weak. At the same time, rapid urbanization in China have been developed a lot of natural watershed, vegetation destruction, drastic changes in land use pattern.The above makes the proportion of impervious surface increased rapidly as well as the hydrological cycle conditions changed greatly.Therefore, the non-point pollution cauesd by urban underlying changes has become a major source for surface water environment pollution. In order to effectively control urban runoff pollution, this article is from the following aspects of its research: Firstly,reference the ideology of quantity control which has been successfully applicated in the management of point pollution,and establish a quantitative relationship between total pollution load of urban runoff and protection objectives of receiving water environment. The specific research contents mainly include three parts: characteristics of urban runoff pollution,simulation of total pollution load,technology of ecological treatment.Secondly,in view of the randomness,non-continuous,sudden,difficult control of urban ruonoff, mastering the characteristics of urban runoff pollution and adopting the appropriate control measures is especially urgent to ease the impact influence for water environment.So as to provide theoretical basis for simulation and control, taking a unversity of chongqing as experimental subject, analyzed the pollution characteristics of urban runoff by monitoring the water quality of different urban underlyings, and disscussed the law of influence for main causes .Thirdly,based on the pollution characteristics of urban runoff as well as the law of"generation-collection-discharge",the total quantity simulation system for urban runoff pollution load was established.And made the production and receiving pollution process together by taking the ideology of quantity control as reference in order to get the total quantity control objective of urban runoff pollution.Taking the measured data of Huxi university district as example, the parameter calibration and model validation were analyzed.While, the scope of model was determined by dissucussing the sensitivity and best domain of parameter. Fourthly, on the basis of summing up the research findings and practical experiences about ecological technologies, as well as considering the results of the above chapters , unit ecological treatments suited for our national conditions were proposed. In view of the three stages(genenration- collection-discharge )during the runoff pollution process, the suitable unit technologies and combination patterns were collected.Thus, an appropriate ecological treatment system was established to reduce the total pollution load of urban runoff effectively.Finally,by applying the model system in Hu xi campus of Chongqing unversity,the total quantity control target on urban runoff pollution load was obatained via analyzing the results of total pollution load on urban runoff and water environment capacity of Hu xi river.And then,based on the target as well as the environment conditions in this region,two ecological control plans were proposed.Finally,through comparing the reduction effect on total pollution load,the optimal ecological treatment system was put forward.