地理科学

地理科学 ›› 2012, Vol. 32 ›› Issue (9): 1112-1118.doi: 10.13249/j.cnki.sgs.2012.09.1112

• • 上一篇    下一篇

基于不同DEM数据源的数字河网提取对比分析——以韩江流域为例

刘远1(), 周买春1(), 陈芷菁2, 李绍文3   

  1. 1. 华南农业大学水利与土木工程学院, 广东 广州 510642
    2. 广东省水文局, 广东 广州 510150
    3. 广东省韩江流域管理局, 广东 汕头 515041
  • 收稿日期:2011-10-13 修回日期:2011-12-15 出版日期:2012-09-20 发布日期:2012-09-20
  • 作者简介:

    作者简介：刘 远（1979-）,男,广东省中山人,讲师,博士研究生,主要从事水文模拟方面研究。E-mail：lyuan@scau.edu.cn

  • 基金资助:
    国家自然科学基金（41171029）、华南农业大学校长科学基金（7600-K07050）、广东省高等学校人才引进专项资金（粤教师[2008]86号）、广东省水利科技创新项目（2009-42）资助

Comparison of Drainage Network Extraction from Different DEM Data Sources: A Case Study of Hanjiang River Basin

Yuan LIU1(), Mai-chun ZHOU1(), Zhi-jing CHEN2, Shao-wen LI3   

  1. 1. College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou, Guangdong 510642, China
    2. Hydrology Bureau of Guangdong Province, Guangzhou ,Guangdong 510150, China
    3. Administration Bureau of Hanjiang River Basin of Guangdong Province, Shantou, Guangdong 515041, China)
  • Received:2011-10-13 Revised:2011-12-15 Online:2012-09-20 Published:2012-09-20

RichHTML

PDF (PC)

赞

摘要：

基于HYDRO1K、SRTM3和ASTER GDEM三种DEM数据,利用BTOPMC地形子模型提取韩江流域河网,并作对比分析。结果表明：① SRTM3提取的河网精度最高, HYDRO1K相对最低。② DEM的垂直精度对提取的河网精度起控制作用。ASTER GDEM的水平分辨率较高,但垂直精度不如SRTM3,因而提取的河网精度不如SRTM3。③ HYDRO1K提取大尺度流域河网具有一定的精度,但在地势平坦区域的效果较差,HYDRO1K不宜用来提取小尺度流域河网。④ 由DEM提取的数字河网精度与当地的地面坡度以及处理DEM的填洼算法有关。

关键词: DEM, 水平分辨率, 数字河网, 韩江流域

Abstract:

Based on the three DEMs of HYDRO1K, SRTM3 (version 4) and ASTER GDEM, drainage networks of Hanjiang River basin are extracted by using the terrain module of BTOPMC. The comparison shows that: ① the accuracy of drainage networks extracted from SRTM3 is the highest, then that from ASTER GDEM. The accuracy of drainage networks extracted from HYDRO1K are not so good. ② The vertical accuracy of DEM controls the accuracy of drainage network extraction. Although the horizontal resolution of ASTER GDEM is high, its vertical accuracy is not so good as SRTM3. Thus, the accuracy of drainage networks extracted from ASTER GDEM is not so good as that from SRTM3, both in whole basin and in sub-basins. ③ In large basin, drainage networks extracted from HYDRO1K are reasonable but become bad in low-relief regions. HYDRO1K is unsuitable for drainage network extraction in small-scale basins. ④ The accuracy of drainage network extraction from DEM is affected by local terrain slopes and the depression filling algorithm. Compared with Arc Hydro Tools, the terrain module of BTOPMC avoids most parallel channels. Also, the threshold contributing area used for channel sources should be identified by referring to the map scale.

Key words: DEM, horizontal resolution, digital drainage network, Hanjiang River basin

中图分类号: 

  • P333