Application of remote sensing and hydrological model on water conservation capacity estimation for reservoir watershed area
1999
Tien-Yin Chou | Mei-Hsin Chen | Lung-Shin Yang (Feng Chia Univ., 100 Wenhwa Rd., Taichung Taiwan (Republic of China). GIS Research Center)
The recent increased pressure on slope land development in Taiwan has changed the land use pattern in many reservoir watershed areas and affected the hydrologic cycle. There were many local researches that examined this related issue, but none can fully describe the relationship between water conservation capacity and land use patterns in watershed area. This study is to integrate and analyze the impact to water conservation from deforestation or other land use pattern changes. Geographic Information Systems (GIS) were adopted to build a digital database for reservoir area and to process hydrologic analysis. Remote Sensing (RS) and Global Positioning System (GPS) were performed to extract and identify the surface vegetation details and land use changes information. By the assistance of hydrologic model for water conservation capacity estimation for land use changes, the outcome of this study can provide an important reference for sound watershed management. This study identified the parameters to be used in heuristic HSPF model from water gauge station in Dapu Reservoir Watershed. Four designed rainstorm simulation events were proven to fit the observed peak. The erosion estimation outcomes from Erosion Index Model (EIM) have been tested to correspond the tendency of higher erosion due to land use changes
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