自然资源学报

自然资源学报 ›› 2003, Vol. 18 ›› Issue (2): 148-154.doi: 10.11849/zrzyxb.2003.02.004

• “黄河流域水循环动力机制与模拟”专题研究 • 上一篇    下一篇

栅格DEM的水平分辨率对流域特征的影响分析

吴险峰1, 刘昌明1,2, 王中根2   

  1. 1. 北京师范大学环境科学研究所, 环境模拟与污染控制国家重点联合实验室, 北京 100875;
    2. 中国科学院地理科学与资源研究所, 北京 100101
  • 收稿日期:2002-08-29 修回日期:2002-12-18 出版日期:2003-04-25 发布日期:2003-04-25
  • 作者简介:吴险峰(1970～),男,湖北武穴人,博士研究生,主要从事水资源水环境研究.E-mail:xianfwu@263.net
  • 基金资助:

    国家重点基础研究规划项目(G19990436-01);中国工程院咨询项目.

Effect of horizontal resolution of raster DEM on drainage basin characteristics

WU Xian-feng1, LIU Chang-ming1,2, WANG Zhong-gen2   

  1. 1. Institute of Environmental Science, Beijing Normal University, State Key Joint Lab.of Environment Simulation and Pollution Control, Beijing 100875, China;
    2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2002-08-29 Revised:2002-12-18 Online:2003-04-25 Published:2003-04-25

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127 | 24

摘要： 数字高程模型(DEM)是当前用于流域地形分析的主要数据,由DEM可以提取河网,为不同尺度的水文模型计算和存储地形参数。对黄河小浪底—花园口区间,面积范围为100～1×104km2的8个研究流域,应用网格大小分别为100～1000m6种水平分辨率的栅格DEM进行了流域特征参数的提取和分析。研究表明,DEM的水平分辨率对提取河网的精确性有影响,网格的增大增加了平地处流向确定的随意性。提取的流域面积、长度等有关的参数差别不大,但坡度值变化明显。参数的差别导致主要受长度和坡度因素影响的流域的汇流时间和滞时有较大的不同。

关键词: 栅格DEM, 水平分辨率, 流域特征, TOPAZ

Abstract: The use of digital elevation models(DEMs)has made it possible to extract drainage network,calculate and store geomorphic parameters for hydrological modeling at different scales.Raster DEMs are the main data source used in hydrology.The effects of different grid cell sizes of raster DEMs on drainage basin characteristics were evaluated.Eight basins ranging approximately from102 km2 to104km2 with elevations from129m to2618m in Xiaolangdi and Huayuankou section at the middle reaches of the Yellow River basin were examined in this study.Using DEMs with6different horizontal resolutions with grid cell sizes varying from100m to1000m,basin parameters included those commonly used in hydrology and geomorphology such as area,elevation,slope,channel length,drainage network are extracted and derived.According to the result,grid size affects the accuracy of derived drainage network,especially the case in the flat areas.Slope is more sensitive to the resolution of DEM than the area,the length and the shape is.Because of the different parameters derived from DEMs of different resolutions,the concentration time and lag time thus calculated vary more apparently in the same basin.

Key words: raster DEM, horizontal resolution, drainage basin characteristics, TOPAZ

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