Study On Water Quality Of Huangbizhuang Reservoir

As one of the important water sources in Hebei province,the water quality of Huangbizhuang reservoir has a profound impact on the economic construction and people's life in the water receiving areas,especially in Shijiazhuang and other places.In order to study the water quality change of Huangbizhuang reservoir,this paper evaluates the water quality of Huangbizhuang reservoir with the grey clustering method and the grey situation decision-making method in the grey system method,and predicts the water quality development of Huangbizhuang reservoir with the improved BP artificial neural network method.Through the detailed data of water quality of Huangbizhuang reservoir,ten main pollution indexes are selected as the main research objects,such as chloride ion,sulfate ion,dissolved oxygen,permanganate index,5-day biochemical oxygen demand,nitrate nitrogen,fluoride,total phosphorus,total nitrogen and fecal coliform.And then they are evaluated and predicted.The water quality of Huangbizhuang reservoir is evaluated and determined by grey clustering analysis and grey situation decision-making method.Analysis results show that the water quality of Huangbizhuang reservoir belongs to class I in most months,but in some months TP and TN exceed the standard,so it is necessary to take appropriate measures to reduce the content of TP and TN in order to ensure the safety of water supply.Based on the improved BP artificial neural network method,the water quality of Huangbizhuang reservoir in 2015 is used as a reference,and the trend of water quality in 2020 is predicted and analyzed.The results have reference value and significance.Through the analysis of the annual and inter-annual trends,it is known that the water quality changes in Huangbizhuang Reservoir are affected by many factors,and the mechanism of action is also complicated.There are three main aspects: 1.The water quality change of the reservoir is affected by the upstream water,In particular,domestic sewage from industrial areas such as Wells and Pingshan in the upper reaches of the Yehe River and industrial emissions have a direct impact on water quality.2.The Huangbizhuang Reservoir belongs to the plain hill-type reservoir.It is subject to the topography and is constructed into a wide and shallow reservoir.The effects of evaporation and precipitation on the reservoir water body are relatively large.The non-flooding evaporation is greater than the precipitation,and the evaporation and concentration are significant.The precipitation in the flood season is greater than the evaporation,which has a dilution effect on the concentration of chloride,sulfate and other factors.3.The water quality of the reservoir is significantly affected by the temperature.The temperature changes during the year are very obvious.The summer heat is high and the winter is cold,which causes the water temperature in the reservoir to change with seasonality.As a result,the growth of aquatic organisms and microorganisms is more obvious due to seasonal changes.The effects on dissolved oxygen,permanganate index,biochemical oxygen demand on the 5th and fecal coliforms were significant.