长江三峡区间数字流域水系的构建

基于全球陆地一公里基础高程GLOBE数据 ,采用Martz和Garbrecht研制的数字高程流域水系模型自动提取长江三峡万县～宜昌区间的河网水系、各子流域分水线、河网与子流域编码及河网结构拓扑关系 ,从而构成该区域的数字流域和数字水系。结果表明该模型生成的水系是可以接受的 ,与 1:10万地形图上长江三峡万县～宜昌区间的水系一致 ,这为空间分布式模型的建立提供了必备的空间信息数据。最后 ,探讨了数字流域水系在流域生态学中的应用前景 ,构建的数字水系可为中尺度以上流域水体和水生生物的资源保护与合理利用提供决策平台 ,服务于社会经济的可持续发展。

DIGITAL BASIN AND RIVER NETWORK IN THE SANXIA REGION OF THE YANGTZE RIVER

The Sanxia Region in the Yangtze River Basin starts from Wanxian city to Yichang city,with its area being 30 620 km\+2 and the river length 337 km.In order to build digital basin and digital network,the Digital Elevation Drainage Network Model (DEDNM) or so called Topographic Parameterization (TOPAZ) was used for the automated extraction of drainage network from digital grid based Global Land One kilometer Base Elevation (GLOBE) data in the region.The river system,watershed segmentation,subcatchment and network node numbering,and their topological relation were considered.The result showed that the drainage system generated by the DEDNM is coincident and acceptable as compared with that on 1:100 000 topography map,providing spatial information for further development of distributed model. Finally, the perspective of the application of digital basin in basin ecology is analyzed. Digital basin and drainage network generated above can provide decision-making platform for resources protection and rational utilization of aquatic organisms in the middle scale of catchment, so as to serve for sustainable socioeconomic development.