基于DEM的成都市数字河网特征及空间分布格局研究  

Study on Characteristics and Spatial Distribution Pattern of Digital River Network in Chengdu Based on DEM

作　　者：任德智 刘益 廖兴勇[1] 肖前刚[1] 王勇军[1] 朱文东 REN Dezhi;LIU Yi;LIAO Xingyong;XIAO Qiangang;WANG Yongjun;ZHU Wendong(Chengdu Academy of Agriculture and Forestry Science,Chengdu 611130,China;Chengdu Xinglv Forestry Science and Technology Development Co.,Ltd,Chengdu 611130,China)

机构地区：[1]成都市农林科学院林业研究所,四川成都611130 [2]成都兴绿林业科技发展有限公司,四川成都611130

出　　处：《四川林业科技》2022年第3期53-59,共7页Journal of Sichuan Forestry Science and Technology

基　　金：成都市科技计划项目“成都市森林碳储量及碳汇增长潜力研究”(2017-Y2500W-17);成都市森林资源监测项目(2020)。

摘　　要：为全面厘清河网水系特征及空间分布格局,助力成都美丽宜居公园城市规划和生态建设。研究基于30m分辨率的DEM数据,提取成都市数字化河网,探讨其特征及空间分布格局。结果表明,成都市河网提取最佳集水面积阈值为7.02 km^(2),河网共5级,总河长4 949.75 km,其中,有利于健康的弯曲河道占71.30%。全市平均河网密度0.35 km/km^(2),平均河道弯曲系数为1.39,不同流域、地貌类型的河网数量特征表现出不同程度的差异。全市河网空间分布随河网级别增加聚集度也随之增加,弯曲河道相对平直河道则呈分布更广,且均匀性更高。西南部岷江流域河网分布的均匀程度明显高于东北部的沱江流域。不同地貌的河网以平原河网疏密程度最密,丘陵次之,山地最疏。In order to comprehensively clarify the river network characteristics and spatial distribution pattern, and assist the urban planning and construction of beautiful and livable park city in Chengdu. Based on 30 m resolution raster DEM data, the digital river network was extracted and its characteristics and spatial distribution patterns were discussed The results showed that the threshold value of the optimal catchment area for river network extraction in Chengdu was7.02 km^(2), with a total river network of 5 levels and a total river length of 4 949.75 km, among which 71.30% were healthy meandering rivers. The average river network density of the whole city was 0.35 km/km^(2), and the average river meander coefficient was 1.39. The quantitative characteristics of river networks in different basins and geomorphic types showed different degrees of difference. The spatial distribution of river network in the whole city increased with the increase of river network level, and the aggregation degree also increased. The curved river channel was more widely distributed and more uniform than the straight river channel. The evenness of river network distribution in Minjiang river basin in west was higher than that in Tuojiang river basin in northeast. Under different geomorphic types, the density of river network was the most dense in plain, followed by hills and mountains.

关 键 词：DEM 成都市 河网密度 河道弯曲系数 

分 类 号：P208[天文地球—地图制图学与地理信息工程]