摘要
以梁滩河12.5 m DEM、重庆市第三次国土调查数据、TM影像为数据基础,利用ArcGIS中的水文分析模块对研究区的河流长度、流域面积、河网密度以及河道个数等水文信息进行提取,将不同汇流阈值下提取的数据与实际河网数据进行对比分析,并通过Horton算法与起伏比法对流域地貌发育阶段进行判定。结果表明,汇流阈值与河流长度、河网密度、河道个数之间存在幂函数关系,拟合度较好;流域的最佳汇流阈值为35000;利用分辨率为30 m的TM影像采取NDWI指数进行自动提取,存在漏提或断流现象;利用Horton算法与起伏比法,最终得出梁滩河流域的地貌发育阶段可能为幼龄期向壮年(偏幼)期发展。
Based on the 12.5 m DEM of Liangtan River,the data of the third land survey of Chongqing and the TM images,the hydrological analysis module in ArcGIS is used to extract the hydrological information such as river length,watershed area,river network density and number of river channels in the study area.The data extracted under different confluence thresholds are compared with the actual river network data,and the development stage of watershed geomorphology is judged by the Horton algorithm and the undulation ratio method.The results show that:(a)there is a power function relationship between the confluence threshold and river length,river network density and number of river channels,and the fitting degree is good;(b)the optimal confluence threshold of the basin is determined to be 35000;(c)the NDWI index is used for automatic extraction of TM images with a resolution of 30 meters,and the phenomenon of missing extraction or broken flow is found;and(d)it is concluded that the geomorphic development stage of Liangtan River basin may be from young age to mature age by using the Horton algorithm and the undulation ratio method.
作者
胡煜佳
郑莉萍
张森林
邵景安
HU Yujia;ZHENG Liping;ZHANG Senlin;SHAO Jingan(School of Geography and Tourism,Chongqing Normal University,Chongqing 401331,China;Chongqing Key Laboratory of Surface Processes and Environment Remote Sensing in the Three Gorges Reservoir Area,Chongqing 401331,China)
出处
《水力发电》
CAS
2022年第10期26-31,36,共7页
Water Power
基金
重庆市技术创新与应用发展专项(cstc2019jscx-gksb-X0060)
重庆师范大学2018年院士专家工作站进站院士牵头科技创新引导专项。
关键词
DEM数据
河网提取
汇流阈值
TM影像
地貌发育
梁滩河
DEM data
river network extraction
confluence threshold
TM images
geomorphic development
Liangtan River
