关键词: 灌溉水;水质评价;地下水污染;模糊综合优化模型;泾惠渠灌区;

Abstract: The Jinghui Canal irrigation area is located in the middle of Central Shannxi Plain, which is one of the main grain production areas of Shaanxi Province.The groundwater utilization exceeds the total amount of regional water resources utilization by 50%.In order to rationally develop and utilize the shallow groundwater in Jinghui Canal irrigation area, ensure the food supply in the irrigation area, the fuzzy synthetic optimization evaluation, Wilcox, USSL graphic method and single factor evaluation method were used to evaluate shallow groundwater quality based on 47 shallow groundwater samples in the irrigation area.The results showed that:(1)The total dissolved solids value of groundwater in the irrigation area was high, the cations was mainly Na+,the Ca2+ and Mg2+ were the second, the anions was mainly SO42-,and the groundwater chemical components were mainly affected by dissolution filtration and concentration.(2)All the shallow groundwater in Jinghui Canal irrigation area was in class III water-level, which was seriously polluted.The long-term irrigation would lead to crop reduction and farmland destruction.The canal water was in class II water-level water, which was better than the groundwater and could be accepted for irrigation.(3)The results of fuzzy comprehensive optimization evaluation were verified by Wilcox, USSL graphic method and single factor evaluation method, which showed that the fuzzy comprehensive optimization model was suitable for groundwater quality evaluation in the study area.This result provides a scientific basis for the management and prevention of groundwater environment in Jinghui Canal irrigation area, and is of great significance to ensure food security in the irrigation area.

Key words: irrigation water; water quality evaluation; groundwater pollution; fuzzy synthetic optimization evaluation model; Jinghui Canal irrigation area;