“自然-人文”融合视角下的西南山区小流域划分与整合  

Delineation and integration of small watersheds in the southwest mountain areas in the perspective of‘nature⁃humanity’integration

作　　者：李政旸 王玉宽[1] 逯亚峰[1] 邓婷 LI Zheng-yang;WANG Yu-kuan;LU Ya-feng;DENG Ting(Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610299,China;University of the Chinese A-cademy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院、水利部成都山地灾害与环境研究所,成都610299 [2]中国科学院大学,北京100049

出　　处：《西南农业学报》2024年第8期1825-1836,共12页Southwest China Journal of Agricultural Sciences

基　　金：中国科学院A类战略性科技先导专项子课题(XDA23090501);中国科学院青年创新促进会项目(2020370)。

摘　　要：【目的】采用“自然-人文”融合的视角,结合人文要素界定小流域划分阈值,强化小流域划分研究的人文特征,为以小流域为基本单元的山区开展国土空间开发和社会经济建设提供区划方案支持。【方法】根据小流域自然水文过程和人文属性因素,利用流域面积法结合均值变点法及边界重叠度概念,以我国西南山区为例,对研究区内6个流域试验区进行小流域划分阈值测算,在得到最佳阈值的基础上,对西南山区以小流域为单元进行划分,并整合划分结果,分析、整合结果的数量与空间特征,提出一种山区小流域划分的融合方法。【结果】①西南山区小流域划分的最佳阈值为30.00 km^(2);②西南山区小流域数量为16075个,面积范围为25.07~431.82 km^(2);③从面积来看,小于50.00 km^(2)的小流域为8702个,占比54.13%,介于50.00~100.00 km^(2)的小流域为5358个,占比33.33%,大于100.00 km^(2)的小流域为2015个,占比12.53%,基本符合当前水利部要求。【结论】通过西南山区实测验证,本研究提出的山区小流域划分与整合方法在结果上能体现小流域的自然与人文属性特征,较好符合当前山区组织单元管理的需要,可为山区小流域区划提供方法借鉴。【Objective】The present paper aimed to adopt a‘nature⁃human’integrated perspective,combine humanistic elements to define the threshold for small watershed division,strengthen the humanistic characteristics of small watershed division research,and provide zoning plan support for land space development and socio⁃economic construction in mountain areas using small watersheds as the basic unit.【Meth⁃od】Based on the natural hydrological processes and human attributes of small watersheds,the watershed area method,combined with the mean change point and the boundary overlap,were used to measure the subdivision threshold of small watersheds in six test areas within the study area,taking the southwest mountain areas of China as an example.After obtaining the optimal threshold,the southwest mountain areas were divided into units by small watersheds.The division results were integrated,and the quantity and spatial characteristics of the integrated results were analyzed.A fusion method for small watershed subdivision in mountain area was proposed.【Result】(i)The optimal threshold for the division of small watersheds in the southwest mountain areas was 30.00 km^(2).(ii)The number of small watersheds in the southwest mountain areas was 16075,with an area range of 25.07 km^(2) to 431.82 km^(2).(iii)In terms of area,there were 8702 small watersheds less than 50.00 km^(2),accounting for 54.13%;5358 small watersheds between 50.00 km^(2) and 100.00 km^(2),accounting for 33.33%;and 2015 small watersheds greater than 100.00 km^(2),accounting for 12.53%,which basically met the current requirements of the Ministry of Water Re⁃sources.【Conclusion】The method for dividing and integrating small watersheds in mountain area is proposed in this study,as verified through field measurements in the southwest mountain areas,reflecting the natural and human attributes of small watersheds.It adequately meets the needs of current organizational unit management in mountain area and can serve as a methodological reference for

关 键 词：小流域 划分阈值 西南山区 山区区划 人地关系 

分 类 号：S17[农业科学—农业基础科学]