標題: DETERMINING DRAINAGE PATTERN USING DEM DATA FOR NONPOINT-SOURCE WATER-QUALITY MODELING
作者: KAO, JJ
交大名義發表
環境工程研究所
National Chiao Tung University
Institute of Environmental Engineering
關鍵字: WATER QUALITY CONTROL;NONPOINT-SOURCE POLLUTION;DRAINAGE PATTERN;DIGITAL ELEVATION MODEL;MODELING;APPROXIMATION
公開日期: 1992
摘要: The drainage pattern of a watershed is an important parameter in nonpoint-source water quality modeling. Manual preparation of this pattern from topographic maps is time-consuming and sometimes subjective. Digital Elevation Model (DEM) data am fundamental cartographic data stored in a uniform grid system which can be easily processed by the computer. Using DEM data and a set of pre-defined rules, the drainage pattern can be automatically determined. Six grid-based methods have been developed, and three of them have been tested for a case study, an ama enclosing a subwatershed of Chin-Mei River, Taipei County, Taiwan, R.O.C. The results are comparable to the manually prepared drainage pattern, although several complexities exist for areas such as depression and highly irregular areas. Several refined rules based on the drainage patterns in adjacent areas are utilized to modify the drainage patterns in these areas. Compared with the conventional manual method, the proposed automated methods am much more efficient for regional water quality studies.
URI: http://hdl.handle.net/11536/3570
ISSN: 0273-1223
期刊: WATER SCIENCE AND TECHNOLOGY
Volume: 26
Issue: 5-6
起始頁: 1431
結束頁: 1438
Appears in Collections:Conferences Paper