利用GRSFAI预测内蒙古北部干旱地区浅层地下水分布

Prediction of shallow groundwater distribution in arid region of northern Inner Mongolia using GRSFAI

为更加快速准确地预测干旱气候环境下地下水的分布规律,利用GRSFAI对地下水富水能力进行评估,针对干旱区特殊气候环境,对GRSFAI的构建指标进行了适当的修改,使其更有利于评价干旱地区地下水分布情况,最终确定地层岩性、地貌类型、地形坡度、汇流累积量和植被覆盖度5个指标构建GRSFAI。通过GF1、Landsat8 OLI数据、地形图和其他资料对5个指标进行解译和提取,利用模糊数学和层次分析方法构建了GRSFAI,对研究区内水井出水量数据与GRSFAI进行了相关性分析,相关系数达到0.77。根据研究区GRSFAI分布特征对地下水分布情况进行了预测,预测结果与验证结果相吻合,证明GRSFAI能准确反映干旱区浅层地下水分布情况,评估结果较可靠,可在同类地区寻找地下水资源工作中推广使用。

In order to quickly and accurately predict the groundwater distribution rule in arid climate,GRSFAI was used to evaluate the groundwater enrichment capacity.According to the special climatic environment of arid area,the parameters of GRSFAI were modified to make it more suitable for the evaluation of the groundwater situation in arid areas and finally it was determined that five indexes,including lithology,geomorphic type,slope,flow accumulation and vegetation coverage were used to construct GRSFAI.These five indexes were interpreted and extracted using GF1,Landsat8 OLI data,topographic maps and other data.GRSFAI was constructed by fuzzy mathematics and analytic hierarchy process,and the correlation between water volume produced from the water bore in the study area and GRSFAI was analyzed,and the correlation coefficient was 0.77.The distribution characteristics of GRSFAI in the studied area were then used to predict the distribution of groundwater,and the prediction results were verified.It is proved that GRSFAI can accurately reflect the distribution of shallow groundwater in arid areas,and the evaluation results are reliable.GRSFAI is recommended in the exploration of groundwater resources in similar area.