| 融合多源数字信息的流域水系提取方法研究 |
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| 引用本文： | 刘金涛,张佳宝,刘建立,李晓鹏.融合多源数字信息的流域水系提取方法研究[J].地理与地理信息科学,2010,26(2). |
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| 作者姓名： | 刘金涛 张佳宝 刘建立 李晓鹏 |
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| 作者单位： | 1. 河海大学水文水资源与水利工程科学国家重点实验室,江苏,南京,210098;封丘农田生态系统国家试验站土壤与农业可持续发展国家重点实验室,(中国科学院南京土壤研究所),江苏,南京,210008
2. 封丘农田生态系统国家试验站土壤与农业可持续发展国家重点实验室,(中国科学院南京土壤研究所),江苏,南京,210008 |
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| 基金项目： | 中国科学院知识创新工程重大项目专题，国家自然科学基金项目，教育部科学研究重大项目 |
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| 摘 要： | 由于DEM数据不包括河流、湖泊(水库)及流域边界和堤坝等信息,因此常规仅依靠DEM提取水系的方法不能反映平坦区域及受人类影响强烈区域水系的真实特征。该文建立了融合DEM、河流、湖泊水库、流域边界和堤坝等多源数字信息的流域水系提取方法,对多源信息进行栅格化,采用所提出的高程-距离函数对DEM进行校正,使得提取的数字水系与实际水系精确拟合。将该方法应用于山区太湖西苕溪流域老石坎水库及其上游集水区和平原丘陵分布区的淮河史灌河蒋家集站、梅山、鲇鱼山水库区间流域,提取的河网结构与地图信息拟合较好。
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| 关 键 词： | 水文 数字高程模型 多源信息 数字地形分析 水系提取 |
Deriving Drainage Networks and Watershed Area: A Methodology Coupling Digital Elevation Model and Multiple Information |
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| LIU Jin-tao,ZHANG Jia-bao,LIU Jian-li,LI Xiao-peng.Deriving Drainage Networks and Watershed Area: A Methodology Coupling Digital Elevation Model and Multiple Information[J].Geography and Geo-Information Science,2010,26(2). |
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| Authors: | LIU Jin-tao ZHANG Jia-bao LIU Jian-li LI Xiao-peng |
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| Abstract: | Distributed hydrological models need a detailed definition of watershed's internal drainage network structure.There are many watershed automatic extraction approaches which based on raster DEM and the eight flow direction method (D8).However,the important difference of these approaches is the method of depression-filling and flow direction-assigning in plat area.In this paper,a new approach,using multiple map information such as river,lake,dam or watershed boundary network as input in addition to DEMs,has been developed.The map is digitized and stored by a raster matrix in this method.Two elevation-distance functions are used to adjust the DEM according to the rater map information.This new approach allows for an accurate fit between the map and the modeled drainage structure.The proposed approach has been tested on the Xitiaoxi River watershed in southern Tai Lake and Shiguanhe River watershed in the Huaihe River.The modeled watershed drainage structure showed a high level of coherence with the map.A comparison between the results obtained with the DEM-based approach and those obtained by the proposed approach clearly demonstrated an improvement over the modeled drainage structure.The proposed approach will benefit the distributed hydrological models which require data such as a flow direction matrix,river,lake and sub-watersheds for drainage structure information. |
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| Keywords: | hydrology DEM multiple information digital terrain analysis watershed delineation |
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