干旱区生态环境知识资源中心(Arid): 基于WorldView-2影像估算黄土高原六道沟小流域退耕还林(草)后的切沟发育速率

Arid

	基于WorldView-2影像估算黄土高原六道沟小流域退耕还林(草)后的切沟发育速率
其他题名	Using WorldView-2 images to estimate gully development of the Liudaogou catchment in the Loess Plateau after the Grain for Green project
	黄婷婷; 杨扬; 史扬子; 曹琦; 冯博; 刘宝元; 刘瑛娜
来源期刊	中国水土保持科学
ISSN	2096-2673
出版年	2021
卷号	19 期号:1 页码:1-10
中文摘要	探讨黄土高原六道沟小流域退耕还林(草)后切沟发育速率及其主要影响因素,为黄土高原小流域切沟定量监测及水土保持措施配置提供参考依据。利用RTK GPS实地测量33条代表性切沟,验证WorldView-2影像的切沟解译精度;将小流域划分为50个集水区,分别解译2012年与2018年各集水区内的切沟,分析2012-2018年间各集水区的切沟发育速率,并探究各集水区切沟发育速率差异的原因。结果表明: 1)与RTK GPS实测数据相比, WorldView-2影像解译切沟长度、最大表面宽度、周长和面积的相对误差主要集中在5%以内。解译误差主要取决于沟头活跃与否、沟缘植被类型以及沟壁土体状况。2) 2012-2018年间,小流域集水区切沟总长度、总最大表面宽度、总周长和总面积的年均变化速率分别为- 0.02%、0.01%、0.01%和0.2%。3)六道沟小流域切沟扩张速率与集水区平均坡长和平均剖面曲率呈显著正相关,与平均坡度呈负相关,与坡向、植被盖度也存在一定的相关关系。 WorldView-2影像为快速、准确地监测小流域切沟发育速率提供了可靠的数据源。
英文摘要	[Background]The Grain for Green project has been implemented for approximately 20 years in the Loess Plateau,which substantially modified the land uses and vegetation covers,thereby inevitably resulting in changes in gully erosion. It is therefore necessary to systematically evaluate gully erosion of the small catchments upon the Grain for Green project and to identify the primary factors affecting gully development. Recently,the resolution of remote sensing products has been greatly improved,and the remote sensing technique may serve as a useful tool for gully erosion monitoring,especially at large spatial and temporal scales. [Methods] A total of 33 typical gullies were selected in the Liudaogou catchment and measured by real-time kinematic GPS (RTK GPS) as well as visually interpreted from a WorldView-2 (WV2) image. The accuracy of WV2 in interpreting gullies was evaluated with the measurements made by RTK GPS and the sources of error were analyzed. The Liudaogou catchment was divided into 50 drainage areas and their basic terrain attributes,annual mean vegetation coverage and comprehensive dynamic index of land use were also extracted or calculated. The gullies in each of the 50 drainage areas were delineated from WV2 images of 2012 and 2018,and the change rates of four gully morphological parameters,i. e.,gully length,maximum surface width,perimeter and area,were calculated. [Results]1) Gullies could be accurately interpreted from WV2 images,as compared to the measurements made by RTK GPS. The relative errors of gully length,maximum surface width,perimeter and area were smaller than 5% for 94%,79%,58% and 76% of the total gullies,respectively. The accuracy of WV2 interpretation was mainly influenced by the activity of gully head,vegetation type of gully edge,and soil conditions of gully walls. 2) During 2012 - 2018,the annual mean change rates of the total gully length,maximum surface width,perimeter,and area in the Liudaogou catchment fell between - 2.1% - 1.2%, - 1.7% - 0.5%, - 1.8% - 1.4% and - 0.2% - 1.5%,respectively. Among the 50 drainage areas delineated,78%,80%,40% and 78% possessed changes rates within the range of 0 - 0.5%/a for the four gully morphological parameters,respectively. The negative rates were probably due to the merging of adjacent rills and artificial gully filling. 3) According to the correlation analysis,the gully development was positively affected by the mean slope length and profile curvature of the drainage areas,but negatively by the mean slope steepness. In addition,it was also related to slope aspect and vegetation coverage. The change rate of total gully area was relatively lower for the leeward slopes and/or the slopes with vegetation coverage greater than 45%. [Conclusions] The WorldView-2 images provide accurate data for gully development analysis at the catchment scale. In the Liudaogou catchment,the generally slow gully erosion upon the Grain for Green project was mainly affected by terrain attributes and vegetation coverage. These findings hold important implications for soil conservation in the Loess Plateau as well as in other arid and semiarid regions.
中文关键词	切沟发育 ; 退耕还林(草) ; 黄土高原
英文关键词	WorldView-2 RTK GPS gully development WorldView-2 Grain for Green RTK GPS Loess Plateau
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Agriculture
CSCD记录号	CSCD:6926601
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/378128
作者单位	黄婷婷, 北京师范大学地理科学学部;;北京师范大学地理科学学部地理学院, 地表过程与资源生态国家重点实验室;;, ;;, 北京;;北京 100875;;100875, 中国.; 杨扬, 北京师范大学地理科学学部;;北京师范大学地理科学学部地理学院, 地表过程与资源生态国家重点实验室;;, ;;, 北京;;北京 100875;;100875, 中国.; 史扬子, 北京师范大学地理科学学部;;北京师范大学地理科学学部地理学院, 地表过程与资源生态国家重点实验室;;, ;;, 北京;;北京 100875;;100875, 中国.; 曹琦, 中国科学院水利部水土保持研究所, 杨凌, 陕西 712100, 中国.; 冯博, 沈阳农业大学水利学院, 辽宁省水土流失防控与生态修复重点实验室, 沈阳, 辽宁 110866, 中国.; 刘宝元, 北京师范大学地理科学学部地理学院, 北京 100875, 中国.; 刘瑛娜, 北京师范大学地理科学学部, 地表过程与资源生态国家重点实验室, 北京 100875, 中国.
推荐引用方式 GB/T 7714	黄婷婷,杨扬,史扬子,等. 基于WorldView-2影像估算黄土高原六道沟小流域退耕还林(草)后的切沟发育速率[J],2021,19(1):1-10.
APA	黄婷婷.,杨扬.,史扬子.,曹琦.,冯博.,...&刘瑛娜.(2021).基于WorldView-2影像估算黄土高原六道沟小流域退耕还林(草)后的切沟发育速率.中国水土保持科学,19(1),1-10.
MLA	黄婷婷,et al."基于WorldView-2影像估算黄土高原六道沟小流域退耕还林(草)后的切沟发育速率".中国水土保持科学 19.1(2021):1-10.