人民长江2018，Vol.49Issue(6)：8-12,5.DOI:10.16232/j.cnki.1001-4179.2018.06.002
DEM分辨率对小流域设计洪峰推求误差的影响
Influences of DEM resolution on error of design peak flow in small watershed
摘要
Abstract
The rational formula is widely applied in the calculation of the design flood in small watershed and the DEM resolu-tion has important influence on topographic parameters in the formula,which may even cause some errors in the calculation of de-sign peak flow. This paper takes Shiyan river basin in Shenzhen as the study area,and DEM data at resolutions of 30,60,90, 120 m and 150 m are used for extraction and comparative analysis of topographic parameters, then sensitivity analysis for three terrain parameters in the rational formula are carried out. The results show that with the increase of DEM resolution,the calculat-ed basin area increases,and the slope of the main river channel decreases,while the length of the mainstream varies irregularly;among the three topographic parameters,the error of the basin area has the greatest influence on the calculation of flood peak, followed by the length of the mainstream,and the slope of the main channel has less effects. Considering the importance of differ-ent parameters,as well as the influence of DEM resolution and catchment area threshold on the parameters, 90 m DEM and catchment area threshold of 390~500 hm2is reasonable to extract basin terrain parameters and the calculation error for the design flood peak is acceptable,which provides a reference to design flood calculation for similar watershed.关键词
推理公式法/设计洪峰/地形参数/DEM分辨率/参数敏感性/石岩水库流域/深圳Key words
rational formula/design peak flow/topographic parameters/DEM resolution/parameter sensitivity/Shiyan Reservoir Basin/Shenzhen分类
天文与地球科学引用本文复制引用
董晓华,杨芝辰,成洁,时磊,刘冀,唐慧雅,郭梁锋,赵乔,李国翔..DEM分辨率对小流域设计洪峰推求误差的影响[J].人民长江,2018,49(6):8-12,5.基金项目
水利部"十二五"公益性行业专项经费项目(201301066) （201301066）
国家自然科学基金项目(40701024,41101511) （40701024,41101511）
