利用MODIS探测华北平原浅层地下水水位变化的初步研究

Preliminary research about the variation of shallow water table of The North China Plain using MODIS data

地下水是陆地最重要的水资源之一,监测地下水水位的动态变化,无论是对于地下水资源评价还是对陆地生态环境变化的研究,都是必需的.传统的水文地质钻孔监测成本高昂且所得数据仅能代表观测孔附近地下水水位.浅层地下水水位影响着浅层岩土含水量,从而影响着地表热惯量,而热惯量可以通过卫星热红外遥感手段获取.因此,通过热惯量的研究,就可以反演浅层地下水的动态变化.利用MODIS地表温度产品以及地表反照率产品计算得到石家庄-保定地区的表观热惯量,并与典型钻孔地下水水位年际变化进行比较分析,建立相关关系,进而推算整个地区的浅层地下水水位的年际变化.初步研究表明,利用热红外遥感是可以估计区域性浅层地下水水位的年际变化的.

Groundwater is one of the most important water resources;monitoring the variation of water table is indispensable when considering the estimation of water resource and environmental variation in terrestrial ecosystems.Traditional monitoring which use hydrogeology drilling needs huge investment,even worse it could only reveal the water table of micro-region.Variation of shallow ground water affects surface moisture;moreover,there is good correlation between surface moisture thermal and inertial which could be calculated with the help of the remote sensing data.So,it is plausible to research the relationship between variation of water table and thermal inertial.Initially,we calculate apparent thermal inertial in Shijiazhuang-Baoding region with the help of land surface temperature and surface Aledo from MODIS.Then,we calculate the correlativity between interannual change of apparent thermal inertial and interannual change of water table.Preliminary research indicate that utilize thermal infrared remote sensing is another possible way to evaluate the interannual change of water table.