GUO Zhonglu1, AI Lei1, HUANG Xudong1, et al. Study on Spatial Distribution of Hydrologically Sensitive Areas in the Watershed Using Soil Topographic Index Method[J]. 2017, 31(6): 100-103.
GUO Zhonglu1, AI Lei1, HUANG Xudong1, et al. Study on Spatial Distribution of Hydrologically Sensitive Areas in the Watershed Using Soil Topographic Index Method[J]. 2017, 31(6): 100-103. DOI: 10.13870/j.cnki.stbcxb.2017.06.017.
This study was conducted in the upstream watershed of Du River
central China
and ASTER GEDM was processed in the system for Automated Geoscientific Analyses (SAGA GIS) package in the R-platform. On the basis of obtaining watershed soil topographic index (STI) and its threshold setting
using Python module programming
three different scenarios (STI≥9
STI≥10
and STI≥11) were selected to delineate and understand the land use types and their areas and spatial distributions within hydrologically sensitive area (HSAs) in the watershed. The results showed that STI technique improved the identification of HSAs
which could reasonably predict the spatial differentiation of runoff in the watershed. Forest land was the major land use in the HSAs under all three scenarios
and about 50% of water was identified as HSAs. Under the three scenarios
the agricultural landscape and development landscape in the HSAs should be prohibited from carrying out intensive land development
and should arrangement priority vegetation buffer zones to protect water quality.