Building Watershed Hydrographic Database by Geodatabase Data Model:A Case of Xitiaoxi Watershed in Taihu Basin
LIU Xiaomei · 2005
The watershed is a complex system with lots of components and relationships among them. How to design the watershed hydrographic database is the key to integrate the watershed information and the hydrographic model for watershed decision analysis. In china, the hydrographic information is mainly acquired from national geographic database and water resource database. Due to the service aims and database technology, there are some shortages for watershed management application. Firstly the database just collects the hydrographic information about flood control and water resource, and lack of water quality information. Secondly, the hydrographic information organized by map layer and lack of the information about relationship between different watershed component. Thirdly, the river network is lack of correct logic relationship, such as connection between river and water body, between river and station location. This paper, using geodatabase technology and Arc Hydro Data Model, designs a watershed database of Xitiaoxi watershed integrating hydrographic information for hydrologic and water quality analysis, and express the system structure and relationships among different components. The watershed boundary, river, outlet are acquired by analyzing DEM using Arc Hydro Toolset in Arcgis environment. The network is built by collecting the flow line, outlet of watershed and lake, monitoring station. The hydrologic relationship is built by Arc Hydro schematic network. In addition, the Time serials are integrated with watershed geodatabase by design tables and relate classes.