| 温春云,吴敦华,吴煜晨,胡 芳,刘聚涛.基于DEM数据与GIS技术方法的水文信息提取研究
——以莲花县为例[J].江西水利科技,2020,(2): |
| 基于DEM数据与GIS技术方法的水文信息提取研究
——以莲花县为例 |
| Extraction of hydrological information based on DEM and GIS：a case study of Lianhua county |
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| DOI： |
| 中文关键词: DEM GIS 河网阈值 河网密度 河网水系 水文信息 |
| 英文关键词: DEM GIS River network threshold River network density River network Hydrological information |
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| 中文摘要: |
| 随着地理信息技术的发展，利用GIS技术手段模拟区域水文分布状况及信息提取是十分必要的.本文基于DEM基础数据，利用ArcGIS软件的水文分析工具，对流向、河网累积值、河网水系、流域面积等水文信息进行了提取，着重对河网提取阈值的选择作了相关分析.结果显示：随着河网阈值逐渐增大，河网密度逐渐减小，二者具有幂函数关系；河网阈值为2000时，提取的河网水系其长度、流域面积及空间分布与县域内实际水系相符合；河网阈值大于4000时，河网密度与空间分布变化幅度趋于稳定，提取的河网水系可用于宏观规划及把控等方面.本研究在一定程度上给予河网水系的提取提供了参考. |
| 英文摘要: |
| With the development of geographic information technology，it is necessary to simulate regional hydrological distribution and informational extraction by GIS.Based on the DEM basic data，the hydrological analysis tool of ArcGIS software was used to extract the hydrological information such as flow direction，flow accumulation，river network and basin area.And the selection of extraction threshold of river network was analyzed.The results show that with the increase of the threshold of the river network，the density of the river network is gradually reduced，and they have a power relationship；when the threshold of the river network is 2000，the length，drainage area，and spatial distribution of the extracted river network are related to the actual situation within the county；when the river network threshold is greater than 4000，the variation of the density and spatial distribution of the river network tends to be stable，and the extracted river network can be used for macroscopic planning and control.This study provides a reference for the extraction of river network water. |
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