Research Of Chebei River Water Quality Improvement Effect By Water Supplement Project

With the rapid urbanization and industrialization,much sewage from industry and living runs into the river,which cause significant environmental damage and water quality.On the basic of sewage interception,water supplement project is considering as a measure for improve river water quality.Chebei river is the one of rivers in the GuangZhou city.The source of water in dry season from Changhong lake,which ZhuJiang river,which collect water from ZhuJiang river by pump.Because the limited-storage of Changhong lake which apply to the other rivers,the research of water quality improvement effected by water supplement project is necessary.This paper launches research through water quality evaluation and simulation.The research contents and main conclusions are as follows:?1?The investigation and evaluation analysis of Chebei river water quality.Water quality data?NH₃-N/TP/DO/transparency/redox potential?were collected in the field.Fuzzy synthetic evaluation method was adopted to assess the water quality;besides,the domestic/industial/livestock and poultry sewage were considered,the quantity and concertration of sewage into the river were estimated.The results as follow:the indexes of water is lower V standards of national groundwater environment quality in the situation of water supply or not.In the situation of didn't water suppy,the membership of lower V standard was high,the membeiships of I^V standard were low.In the situation of water supply,the menbeiship of lower V standard decreased,the membeiship of I^V standard were increasing.There is certain amount of sewage into the river.Changhong lake water supplement project can improve water quanlity.?2?The hydrodynamic water quality model in Chebei river was established.Based on collected data of study area,the one-dimensional hydrodynamic water quality model was established.The flux and water level and water quality boundary data in upstream or downstream were measured from locales,the distributed boundary data adopted the estimation of quantity and concertration of sewage into the river.In order to vertify the accuracy of model,RE and NSE were selected to be the index,the result show that the model can reflect the change and attenuation of flow and water quality,the verification of hydrodynamic and water quality parameters are accurate.?3?The regulation of tidel in Chebei river estuaries was analysised.The problems of water spply in Chebei river as follow:chebei river could not satisfy the whole-day water supply;velocity is slow in middle reaches,water supplement scheme ignore the regulation of tidel.Because making the optimization water supplement scheme should conbine the tidel regulation,this paper used the fuzzy isodate algorithm to analyze the tidel regulation.Taking the november as example,combining the HuangPu tide gauge's data,this paper calculate tadel level and the time of occurrence.?4?Water supplement schemes were analyzed and simulated.In order to found the problems of water supplement scheme,hydrodynamic water quality model was Adope to simulate the pollution distribution.Three water supplement schemes were offered for the problems,according to the calculation results of model,the first scheme can effectively reduce the concertration of pollution in upstream,but that was poorly improved in middle and downstream.The second scheme adopt the unsteady water supplement,which had better improve the water quality for the river.The third scheme increase the quantity of water supplement point,which failed to take effect for water quality improvement.The second scheme is adopted and the water quality improvement was effective.