Study On The Groundwater Quality Assessment Of Irrigated Area And Countermeasure For Protection

Water resource is valuable to lives'survival and development. As an important part of water resource, groundwater plays a very important role on development of society and national economy as well as the security of water supply.The article studies on Jinghui irrigated area, which is located on Guanzhong plain, Shanxi province. Jinghui irrigated area, with the coverage of 1233 km2, takes its natural course from Jing River, irrigating 1.35 million mu of farmland in 6 counties (districts) including Jingyang, Sanyuan, Gaoling, Lintong, Yanliang and Fuping of Xianyang, Xian and Weinan 3 cities.Although there is rich farmland and good irrigation condition, water shortage is serious without overall planning on water resources in the irrigated area. In order to satisfy the requirement of agricultural irrigation, groundwater is over explored in successive years, which causes depression of water level and funnel area in irrigated area. Furthermore, industrial development causes serious pollution and high mineralization ratio of groundwater in irrigated area as well. All these contribute to deterioration of shallow-groundwater quality and eco-environment, resulting in huge harm and loss on construction, economic development, people's life and eco-environment of irrigated area.Water quality assessment is the basic work and important mean for protecting water resources. Based on the analysis of water sample from Jinghui irrigated area, the quality of groundwater in this irrigated area is assessed by Fuzzy Synthetic Assessment. According to experimental data and the quality standard of groundwater, water quality of different monitoring points is classified. Via ArcGIs statistical analysis module, interpolation on classification of water quality is taken to analyze variation trend of water quality.In the end of the article, the reason for deterioration of water quality in Jinghui irrigated area is analyzed according to water quality assessment and the countermeasure to water pollution in irrigated area is brought up. Deterioration of water quality is caused by various reasons among which over-exploration and industrial production are main reasons, therefore, reasonable overall planning on groundwater exploration and well spacing should be carried out to protect water quality in this irrigated area thoroughly. As well, amount of water exploration must be controlled and decreased; deep-well must be forbidden in water deficient area; relationship of"three-water"should be coordinated; discharge of industrial wastewater and domestic sewage should be controlled strictly, pollution of groundwater, aggravation of pollution and deterioration of environment must be avoided; and artificial recharge must be carried out in the area where gets depression of groundwater level by over-exploration.