不同集水面积阈值确定方法在典型黄土侵蚀地貌区的适用性分析  

Applicability Analysis of Different Flow Accumulation Threshold Determination Methods in Loess Eroded Area

作　　者：张鹏举 孟宪萌[1] 周宏[2] 刘登峰[3] ZHANG Peng-ju;MENG Xian-meng;ZHOU Hong;LIU Deng-feng(School of Environmental Studies,China University of Geosciences, Wuhan 430074, China;Geological Survey of China University of Geosciences,China University of Geosciences, Wuhan 430074, China;School of Water Resources and Hydropower,Xi'an University of Technology, Xi'an 710048, China)

机构地区：[1]中国地质大学(武汉)环境学院,湖北武汉430074 [2]中国地质大学(武汉)地质调查研究院,湖北武汉430074 [3]西安理工大学水利水电学院,陕西西安710048

出　　处：《水电能源科学》2019年第8期26-29,共4页Water Resources and Power

基　　金：国家自然科学基金项目（51109192）;中国地质调查局项目（DD20190327）;中国地质大学（武汉）中央高校基本科研业务费专项资金资助项目（CUG160205）;海印创新奖学金资助项目（1201710740）

摘　　要：针对不同集水面积阈值确定方法的适用性问题,结合流域地貌侵蚀发育理论和侵蚀阶段—水系分维数关系判断了理论水系分维数大小,以水系分维数作为评判指标,分析了不同集水面积阈值确定方法的适用性,并以此为基础建立了一套无“蓝线”河网情况下检验集水面积阈值确定方法合理性的完整体系。实例应用结果表明,泾河流域水系结构具有典型的分形特征,其理论水系分维数应在1.4~1.6之间;受黄土地貌软弱岩性的影响,河网密度法及河道分支法在黄土沟壑地貌中具有良好的适用性,能较为细致地反映沟谷河道的准确信息;河源最小误差法及试错法下的水系分维数与理论值存在较大偏差,只适用于地形地貌变化不大的小型流域。A method based on the theory of geomorphic development and drainage fractal dimension is proposed for testing the rationality of different threshold determination methods for catchment area. Selecting drainage fractal dimension as identification index, the applicability of different catchment area threshold is analyzed. The results show that water system structure of Jinghe basin has a typical fractal characteristics and the theoretical drainage fractal dimension is in the range of 1.4 and 1.6. The drainage density method and channel branch method have a good applicability in the watershed of the loess hilly landform and can reflect the accurate information of gully channel. There is larger deviation between the theoretical value and the drainage fractal dimension obtained by the river source minimum error method and trial and error method, which is only applicable to small watershed with little change of topography.

关 键 词：集水面积阈值 水系分维 DEM 泾河流域 

分 类 号：P343.1[天文地球—水文科学] P931.1[天文地球—地球物理学]