青海省鱼卡-大柴旦盆地绿洲地下水位埋深遥感反演

以卫星遥感数据获得鱼卡-大柴旦盆地绿洲地下水位分布状况,利用TM8数据获得归一化植被指数NDVI,利用大气传输方程法反演地表温度TS,构成TS-NDVI特征空间,计算得到温度植被干旱指数TVDI对研究区表层土壤含水量进行估算。干旱区土壤水依赖于地下水,利用表层土壤含水量和TVDI与地下水位埋深的经验方程得到研究区地下水位埋深分布图并进行实地验证。结果表明:研究结果符合实际,用土壤含水量和TVDI反演得到的地下水位埋深与实测地下水位埋深之间的相关系数分别为0.83和0.765。

Remote sensing invertion of groundwater level in Yuka-Dachaidan basin delta area of Qinghai province

The purpose is to get the situation of groundwater level distribution in Yuka-Dachaidan basin delta area in Qinghai province by data of satellite remote sensing.The paper obtained NDVI by use of TM8 data,and retrived land surface temperature (T_S) from atmospheric transmission equation to construct T_S-NDVI space.The temperature vegetation dryness index (TVDI) was obtained and topsoil moisture was retrieved by using TVDI. In arid and semi-arid regions,the topsoil moisture and TVDI are depended on groundwater level , so the groundwater level distribution can be calculated through the correlation between the topsoil moisture ,TVDI and groundwater level.The result is in accordance with actual.The correlation coefficients of groundwater depth obtained by soil moisture and TVDI,and by measurement are 0.83 and 0.765 respectively.