Evaluation Of Water Quality In Wangdonggou Watershed,Changwu Shanxi Province

The water crisis caused by lack of water resources and water pollution has become one of the key factors restricting social and economic development.Especially in the arid regions of Northwest China,water quality assessment is particularly important.The Wangdonggou Watershed is located in Changwu,Shaanxi Province,and is the location of the Changwu Ecological Experiment Station.The ecological test station provides scientific support for the sustainable development of regional agriculture and the improvement of the ecological environment.Therefore,it is of great significance to understand the water environment of the basin..Based on the analysis of water table groundwater level,precipitation,rainwater quality,watershed groundwater,and water quality of the crossing Heihe River,the comprehensive water quality index method is used to evaluate the groundwater quality of the basin,and the fuzzy evaluation method is used to evaluate the groundwater quality of the basin.The Darwin test evaluates the temporal and spatial variation of water quality in the basin groundwater and transit Heihe water.The main results obtained are as follows:1.The pH of rainwater has a tendency to decline as a whole,while the annual variation of SO₄^2-ion,salinity,TSS?suspension?and electrical conductivity is small,and the variation is significant during the year.The whole groundwater in the basin is maintained at 81-87m,and the monthly variation is obvious during the year.2.The content of K⁺,Na⁺,Mg²⁺,Cl^-,SO₄^2-and mineralization in the Heihe River is much higher than that in the basin.The groundwater pH value,Ca²⁺,CO₃^2-and bicarbonate ions,total nitrogen and transit Heihe water content in the basin are basically the same and the trend is consistent.3.The water quality of the crossing Heihe River is in good condition and is maintained between Class II and III waters;the groundwater quality is good,most of them are maintained in Class III water quality,and the water quality in the basin shows a good trend.The water quality of the four groups of spring water in the basin is relatively stable,and the water quality of the three groups of spring water and well water varies greatly.4.Through seasonal Kendal test,the calcium,potassium,total phosphorus and mineralization degree of groundwater quality in Wangdonggou watershed showed a downward trend as a whole,and the decline trend of total phosphorus was the most obvious,and carbonate ion showed an upward trend.Other indicators have not changed much,and there is no obvious tendency to rise and fall.Overall,the groundwater quality in the Wangdonggou watershed showed a good trend;the water quality of the Heihe River in the transit water was small and stable for 10 years.There is a significant decrease in salinity,sulfate and total phosphorus.There were no significant changes in other indicators.