BAO Wei-jia,CHENG Xian-fu,CHEN Xu-dong.Effect of Horizontal Resolution of Raster DEM on Drainage Basin Characteristics[J].Research of Soil and Water Conservation,2011,18(02):129-132,138.
DEM水平分辨率对流域特征提取的影响分析
- Title:
- Effect of Horizontal Resolution of Raster DEM on Drainage Basin Characteristics
- Keywords:
- DEM; small watershed; horizontal resolution; drainage basin characteristic; topographic index
- 分类号:
- TP79
- 摘要:
- 在基于数字高程模型（DEM）的流域地形分析中，栅格DEM的分辨率对分析结果具有很大的影响。以舒城县内面积为7.9 km2的龙潭小流域作为研究区域，分别对分辨率为5 m×；5 m～50 m×；50 m的10幅DEM数据进行流域特征提取和分析，计算地形指数并分析其分布特征。研究表明：在小流域尺度上，DEM分辨率的变化对流域面积、最长河道长度等参数影响不大，对河道总长度、河网密度及平均坡度等参数有较大影响，对流域特征的提取影响规律为DEM分辨率越低，提取的流域特征越粗糙；且分辨率低于15 m的DEM计算出的地形指数值较为离散、概率分布曲线形状较之5 m分辨率DEM的地形指数概率分布曲线有明显不同，表明分辨率低于15 m的DEM对小流域水文地形信息的反映较差，为小流域尺度水文模型DEM数据适宜分辨率选取提供一定的理论依据。
- Abstract:
- Based on digital elevation model (DEM) of the watershed terrain analysis, raster DEM resolution on the results of the analysis has great impact. In this paper, taking Longtan small watershed inupstream of the Hangpu river basin as an example, by means of ten different spatial resolution DEMs of the study watershed from 5 m to 50 m respectively, the basin characteristics were extracted with ArcHydro Tools to investigate the effects of DEMs in different spatial resolution on the performance of the simulations induced by the topographic characteristic parameters. The statistical results showed no evident different derived in the watershed area and longest channel length retrieval from different resolution DEMs, but greater differences were found in total channel length and channel density extractions in small watershed scale. The change of channel density tends to be stable when DEM resolution is lower than 15 m. Compared the extracted results under different resolution of DEMs, it was found that the bigger size of DEM raster is, the more rough extraction of watershed characteristics are. For examining the distribution Curves of Topographic Index (TI) calculated by different grid resolution, it was found that TI was influenced by DEM resolution, TI fluctuates evenly when the highest resolution DEM was employed, but considerably with the poorest resolution DEM being used. The distribution curves of TI calculated by lower than 15 m grid resolution were more discrete and had large different from the highest resolution DEM being used, which implies its potential usage in Suitable resolution selection.
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备注/Memo
收稿日期:2010-8-30;改回日期:2010-9-30。
基金项目:安徽省自然地理学重点学科（AH021）；安徽省自然科学基金项目（090415212）
作者简介:鲍伟佳（1986- ），男，安徽南陵人，硕士研究生，主要从事地理信息系统软件开发与应用研究。E-mail：ric_bob@163.com
通讯作者:程先富（1967- ），男，安徽合肥人，教授，博士，主要从事农业资源与信息技术的教学与研究工作。E-mail：xianfucheng@sina.com