摘要
DEM数据是流域水文分析和模拟的基础,不同DEM分辨率尺度深刻影响着水文分析和水文过程模拟的结果。本文基于机载LiDAR获取的DEM数据,分析了不同分辨率LiDAR DEM在坡度提取、水文指数分析和流域特征参数提取中的差异及产生原因;基于SWAT分布式水文模型模拟研究了不同分辨率DEM数据的水文效应。研究结果表明:随着DEM分辨率的降低,坡度平均值减小,TWI平均值增大,SPI平均值减小,LSF均值先增大后减小,当分辨率为10 m时,LSF取得最大值;SWAT模型模拟结果表明,随分辨率的降低、坡度值的变小,地形湿度指数变大,蒸散发量增加,地表径流深减小,而土壤渗漏量与地下径流量则是先减小后增加,出现极值时DEM分辨率为10 m,与LSF出现极值时一致。
DEM data is the basis for watershed hydrological analysis and simulation. The results of hydrological analysis and simulation have been impacted profoundly by different resolution scale of DEM. Based on the DEM data acquired by airborne LiDAR,the discrepancies resulted from different resolution DEM in slope extraction and hydrological index analysis are analyzed. And the SWAT distributed hydrological model is used to simulate and analyze the hydrological effects of DEM data with different resolutions. The research shows that,with the decrease of the DEM resolution,the slope and the mean SPI reduced,the mean TWI increased. The mean LSF increases first and then decreases,the maximum LSF is at 10 m resolution. The SWAT model simulation results indicate that,with the lower resolution and the smaller value of the slope,TWI becomes larger,evapotranspiration increases,surface runoff depth reduces while the amount of soil leakage and underground runoff is first decrease and then increase,same as LSF,10 m is the extreme point.
作者
兰进京
于海洋
陈琳
马慧慧
张慧勇
LAN Jinjing;YU Haiyang;CHEN Lin;MA Huihui;ZHANG Huiyong(No.2 Institute of Geological&Mineral Resoures Survey of Henan,Zhengzhou 450001,China;School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Yellow River Conservancy Techical Institute,Kaifeng 475004,China;Hangzhou Tianyuan 3D Scanning Technology Co.,Ltd.,Hangzhou 310000,China;Xinzheng Branch of Henan Land and Resources Investigation and Planning Institute,Zhengzhou 450053,China)
出处
《测绘通报》
CSCD
北大核心
2020年第4期40-46,共7页
Bulletin of Surveying and Mapping
基金
2019年度河南省自然资源科研项目(豫财招标购-2019-378-16)。
