Research On Emulation Of Distributional Law Of Soil Water Contents In Various Stands Of Small Watershed Based On RS & GIS

To emulate the distributional law of soil water contents based on RS & GIS can get information about the soil humidity of plot in a watershed quickly and accurately. The paper gives an example of this method. Applies RS and GIS to built DEM of NiHe watershed in ShaanXi of China. Then makes use of the experiment data of water contents in various stands with site conditions of NiHe watershed and applies multiple statistical regression to get emulation model that describe the function relation of water contents in various stands with site conditions. Last, applies DEM and the emulation model to emulate the distributional law of water contents in various stands of this watershed. The conclusion is as follows:1. Based on image interpretation, we get the distribution map of the woodland, the lawn and the farmland in the NiHe watershed. Applying MAPGIS6.0, we get the DEM and the spatial-database of this watershed. These data are very important for the management of the watershed.2. There are 6 major land-use classes ( field, orchard, woodland, grassplot, residential area, and road)in the aerial pictures of NiHe watershed. Applying MATLAB5.2, we analyze the image enhancement effect of these land-use classes by using the histeq and imadjust etc.3. Based on the analysis of stands of this watershed, we get the slope of soil and aspect distributional information of this watershed. This information is very important for the investigation of the water contents in various stands.4. Based on the investigation of the water contents in various stands of this watershed, we get the emulation model of the NiHe watershed.5. By emulating the distributional law of water contents in various stands based on RS & GIS, we get the emulate distribution map of the water contents in various stands. We can get the information of water contents of a plot quickly by using this map. It is very important for the management of watershed.6. We get the distributional law of water contents in various stands of the NiHe watershed by emulate method based on RS & GIS. It is same to the result that other people had get from investigation of this watershed. But the emulate method is more quickly.