DEM分辨率对山地河流形态提取的影响  

Effect of DEM Resolution on Morphology Extraction of Mountain Rivers

作　　者：何成邦 胡春生 赵婷婷 李伯祥 HE Cheng-bang;HU Chun-sheng;ZHAO Ting-ting;LI Bo-xiang(School of Geography and Tourism,Anhui Normal University,Wuhu 241002,China)

机构地区：[1]安徽师范大学地理与旅游学院,安徽芜湖241002

出　　处：《安徽师范大学学报(自然科学版)》2023年第6期555-563,共9页Journal of Anhui Normal University(Natural Science)

基　　金：安徽省自然科学基金面上项目(2108085MD127).

摘　　要：探究DEM数据分辨率差异对河流形态提取的影响,可以为因地适宜地选择DEM数据、提高地表信息提取准确性进而优化河流提取算法提供参考。本文运用改进的Frechet距离法,并结合河道弯曲系数和裂点分布,对比分析不同分辨率DEM提取的案例河流形态差异。研究表明:(1)DEM分辨率与河流形态提取准确性呈现明显的正相关性,数据分辨率越高,河流形态提取的准确性也越高,越接近真实河流;(2)DEM分辨率对河流形态提取的制约程度存在差异,水平形态受到的制约作用较大,纵剖面形态受到的制约作用较小;(3)重采样DEM提取河流形态准确性优于相同分辨率的原始DEM数据。而简化操作并不会对河流形态提取准确性产生明显影响。The study of the influence of DEM resolution on the extraction of river morphology can provide a reference for the selection of DEM data,the improvement of the accuracy of the extraction of surface information and the optimization of the extraction algorithm of river morphology.In this paper,the improved Frechet distance method is used to compare and analyze the river morphology extracted from DEMs with different resolutions,combined with the channel bending coefficient and knickpoint distribution.The results show that:(1)DEM resolution has a significant positive correlation with the accuracy of river morphology extraction.The higher the data resolution,the higher the accuracy of river morphology extraction,and the closer it is to the real river;(2)DEM resolution has different constraints on river morphology.The vertical section is more restricted than the horizontal form.(3)The accuracy of resampling DEM in extracting river morphology is better than the original DEM data with the same resolution.The simplified operation did not significantly affect the accuracy of river morphology extraction.

关 键 词：DEM分辨率 庐山 河流形态 Frechet距离 

分 类 号：P333[天文地球—水文科学]