| GIS支持下的基于DEM的水文响应单元划分——以洞庭湖为例 |
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| 引用本文： | 张旭,蒋卫国,周廷刚,唐宏. GIS支持下的基于DEM的水文响应单元划分——以洞庭湖为例[J]. 地理与地理信息科学, 2009, 25(4) |
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| 作者姓名： | 张旭 蒋卫国 周廷刚 唐宏 |
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| 作者单位： | 1. 西南大学地理科学学院,重庆,400715;三峡库区生态环境教育部重点实验室,重庆400715
2. 北京师范大学环境演变与自然灾害教育部重点实验室,北京,100875;北京师范大学民政部教育部减灾与应急管理研究院,北京,100875 |
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| 基金项目： | 国家自然科学基金(40701172);;国际科技合作计划专项项目(2007DFA20640);;国家高技术研究发展计划(2007AA120306、2007AA120205);;对发展中国家科技援助项目 |
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| 摘 要： | 在GIS技术支持下,以洞庭湖为研究区,设计了水文响应单元划分的实现方案和算法,即用适度指数法确定合理的集水面积阈值,从DEM中提取子流域,并与土地利用和土壤类型图进行空间叠加分析,使得生成的每个水文单元仅含有单一的土地利用和土壤类型。结果表明:洞庭湖流域被离散成105个子流域、19 759个水文响应单元,符合分布式水文模型构建的需求;适度指数法用于设置合理的集水面积阈值,避免了人工率定阈值带来的不确定性,提高了子流域生成的精度和智能性。
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| 关 键 词： | 数字高程模型 水文响应单元 地理信息系统 景观格局 |
Hydrological Response Unit Division for Dongting Lake Based on DEM and GIS |
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| ZHANG Xu,JIANG Wei-guo,ZHOU Ting-gang,TANG Hong. Hydrological Response Unit Division for Dongting Lake Based on DEM and GIS[J]. Geography and Geo-Information Science, 2009, 25(4) |
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| Authors: | ZHANG Xu JIANG Wei-guo ZHOU Ting-gang TANG Hong |
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| Affiliation: | 1.School of Geographical Sciences;Southwest University;Chongqing 400715;2.Key Laboratory of Eco-environments in Three Gorges Reservoir Region;Ministry of Education;3.Key Laboratory of Earth Surface Processes and Resource Ecology;MOE;Beijing Normal University;Beijing 100875;4.Academy of Disaster Reduction and Emergency Management;Ministry of Civil Affairs & Ministry of Education;China |
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| Abstract: | Hydrological Response Unit(HRU)division plays an important role in analysis on hydrological responses of landscape pattern changes.Based on the GIS technology,a specific algorithm for HRU division is presented in this paper.The threshold for catchment area is determined reasonably by the method of fitness index,and then subcatchment delineation can be divided from DEM.By means of overlap analysis of sub-basin map,land-use map and soil map to build up Hydrological Response Units that including single type of... |
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| Keywords: | DEM Hydrological Response Unit (HRU) GIS landscape pattern |
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