基于GIS的河套灌区井渠结合分布区的确定方法

A Distribution-determination Method of Conjunction Use District with Groundwater and Surface Water for Hetao Irrigation District Based on GIS

实施井渠结合,合理开发利用地下水是河套灌区节水和控制土壤盐碱化的重要途径。运用ArcGIS分析了地下水矿化度和土壤岩性特征,采用空间分层的处理方法构建了地下水矿化度分区图,并结合灌区土地利用状况和农业灌溉用水要求确定了井渠结合区分布以及面积。结果表明,将矿化度数据分3个空间层处理是可行的,建立的矿化度分区图呈一定的空间变化特征。井渠结合区主要分布在乌兰布和灌域非沙漠带、解放闸灌域和永济灌域南部、义长灌域北部及其与乌拉特灌域、乌梁素海交界附近区域、乌拉特灌域尾部、灌区北部沿狼山山脉部分区域。井渠结合区约占整个灌区控制面积的45%。

The implementation of conjunctive irrigation use of groundwater and surface water,as well as rational exploitation and utilization of groundwater,were effective and appropriate ways to save water and control soil salinization in Hetao irrigation district,Inner Mongolia.In this paper,the groundwater salinity data and soil lithology characters were analyzed by ArcGIS,and then the distribution map of groundwater mineralization were constructed applying spaced elamination method,and finally the distribution and conjunction use districts of groundwater and surface water were determined taking the situation of land use and the water quality requirement of agricultural irrigation into consideration.The results showed that dividing all salinity data into three spatial layer was feasible.And some spatial characteristics were present on the distribution map of groundwater mineralization.Conjunctive use districts of groundwater and surface water were mainly distributed in non-desert areas of Ulanbuh irrigated area,south of Jie Fangzha and Yong Ji irrigated area,north of Yi Chang irrigated area and its juncture areas with Urat irrigated area and Ulansu Hai,the tail end of Urat irrigated area,and there were also parts of the distribution area along the northern Lang Shan Mountains.The control area of conjunctive use districts of groundwater and surface water accounted for about 45% of the control area of all Hetao Irrigation District.