Modelling landscapes using terrain analysis to delineate landforms and predict soil depths � examples from catchments in NSW
نویسندگان
چکیده
A GIS method for modeling landscapes to predict total soil depth and the depth of different soil layers is presented. The method is based on terrain analysis using a DEM and the combined use of the Topographic Wetness Index (TWI) also known as the Compound Topographic Index (CTI) and the Multi-resolution Valley Bottom Flatness index (MrVBF). Examples of the output for several catchments show that soil depth can be predicted at the catchment scale. Only preliminary field checking and validation was carried out, but the results gave values for soil depth and surface soil depths that were within expected values. Several observations about the application of the method are made based on the results for the catchments. For one catchment, the division of the landscape into landform elements is presented and predicted soil depths are related to these landform patterns. Overall the method gives expected values of soil depths, but further validation of the method using field data is required.
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