摘要
随着流域数字化进程中空间基础数据库的建设,应用地理信息系统平台有效地分析流域和水库的基本水文信息成为可能。结合在长江一级支流黄柏河流域分布水文模型建立过程中对DEM数据的应用,重点论述了从栅格DEM数据中提取水文信息的基本方法、研究进展、河网提取过程中临界支撑面积的确定方法、DEM数据分辨率对于水文要素提取的影响及其最小分辨率的确定方法。
In the process of watershed digitization, spatial geo-database technique is utilized widely. Basic hydrological information of watershed and reservoir can be analyzed using the platform of geographical information system (GIS) effectively. This paper describes the method and the general procedure of hydrological information extraction from grid DEM data, the selection method of critical support area, the influence of the resolution of DEM data exerting on results of basin networks extraction, and the decision of the minimum suitable DEM resolution.
出处
《中国农村水利水电》
北大核心
2006年第10期12-16,共5页
China Rural Water and Hydropower
关键词
数字高程模型
流域
平均山坡长
GIS
精度影响
digital elevation model (DEM)
watershed
average hill-slope length
GIS
resolution influence