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Due to increasing levels of societal demand, water resources become further stressed. Therefore, knowledge of the internal renewable water resources of a country becomes strategic information which is needed for long-term planning of a nation's water and food security. Soil and Water Assessment Tool (SWAT) is a powerful watershed model for simulating the effect of watershed processes and management...
Water shortage and pollution are becoming more serious for population explosion and rapid economic growth. Hydrologic models, essential to watershed planning and management, can represent the complex hydrological phenomenon and is an effective tool to simulate hydrological process. This paper mainly discusses the theory of HSPF and automatic calibration with PEST. Analysis shows that HSPF is an effective...
Hydrologic scenario simulation plays an important role in region planning, disaster prevention and mitigation. Hydrologic scenario simulation is a technique obtaining future hydrologic scenarios by importing future climate scenarios and land use/land cover change scenarios in the hydrological model. It includes techniques such as establishing catchment spatio-temporal database, constructing hydrological...
Land use/land cover change (LUCC) as an important part of global environmental change has always been one of the hottest issues of ecology research. Based on RS and GIS methods, land use information for 1990 and 2008 was acquired from TM images and analyzed in Yanqing County, Beijing, China. This paper analyzes spatial-temporal land use change in two basins covering the study period. The results showed...
Flood disaster is one of the major natural disasters, the frequency and destructive power of it ranks one of the top disasters in China. In the flood risk assessment, the distribution of drainage network is a very important assessment factor. This study extract the watershed features of Pearl River Basin and Luan River Basin based on the Digital Elevation Model (DEM) and GIS-supported geospatial data...
Hydrologic model setup is an important process in the whole model simulation. This study introduces an approach for hydrological simulation analysis based on extracting watershed features from DEM using Arc Hydro Tools. This method consists of two steps: firstly, extracting watershed features from DEM using Arc Hydro Tools. Then, process hydrological simulation analysis with hydrologic model HSPF...
In the Yanqing area, Beijing, China agriculture water use and soil erosion are significantly serious due to large-scale agricultural irrigation; It has been the most prominent issue of agricultural irrigation for water resources protection, mainly because irrigation water use utilization efficiency is very low. The key issue of water-saving agriculture is to improve the utilization of irrigation....
Extracting watershed features from DEM (Digital Elevation Model) is a very important task in Hydrologic study, and also it is the pre-process of hydrological simulation analysis. This paper introduces a very useful method for Hydrological simulation analysis based on extracting watershed features from DEM using Arc Hydro Tools. Arc Hydro is a geospatial data model especially GIS for Water Resources,...
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