基于水分变化动态方程的土壤水分变化量估算

以淮河流域地表土壤含水量为研究对象,利用2010年3~6月多时相MODIS数据和降雨量、土壤相对湿度等实测数据,结合水文模型和土壤水分变化动态方程,研究地表土壤水分变化量的模拟方法。结果表明:根据土壤水分变化动态方程估算的地表土壤含水量变化量,与实测值进行比较,在10 cm和20 cm深度处两者变化趋势一致,拟合的一元线性回归方程均能够通过显著性检验,相关系数分别为0.53和0.62,符合显著相关;均方根误差分别为9.87%和4.64%。可认为该方法能够较好估算地表浅层土壤含水量的变化量。

Estimation of the Soil Moisture Variation Based on Soil Water Movement Equation

Based on the product data of MODIS surface parameters and meteorological data of Huaihe basin from March to June,2010,the article carries out the method to estimate the variable quantity of soil moisture content with hydrologic model and Soil moisture content quantity dynamical equation .The results show that ,to compare the setimated value with the measured value, the trendency are both consistent at the depth of 10cm and 20cm.Fitted linear return equation can pass the test of significance and the coefficient of association are 0.53 and 0.63,which reached significant level.The average relative error are 9.87% and 4.64%.The method can be considered to perfectly estimate?the changes of surface layer soil moisture.