title: A quantitative study of gully erosion based on object-oriented analysis techniques: a case study in Beiyanzikou catchment of Qixia, Shandong, China.
abstract: This paper took a subregion in a small watershed gully system at Beiyanzikou catchment of Qixia, China, as a study and, using object-orientated image analysis (OBIA), extracted shoulder line of gullies from high spatial resolution digital orthophoto map (DOM) aerial photographs. Next, it proposed an accuracy assessment method based on the adjacent distance between the boundary classified by remote sensing and points measured by RTK-GPS along the shoulder line of gullies. Finally, the original surface was fitted using linear regression in accordance with the elevation of two extracted edges of experimental gullies, named Gully 1 and Gully 2, and the erosion volume was calculated. The results indicate that OBIA can effectively extract information of gullies; average range difference between points field measured along the edge of gullies and classified boundary is 0.3166 m, with variance of 0.2116 m. The erosion area and volume of two gullies are 2141.6250 m(2), 5074.1790 m(3) and 1316.1250 m(2), 1591.5784 m(3), respectively. The results of the study provide a new method for the quantitative study of small gully erosion.
authors.affiliation: College of Geography and Planning, Ludong University, Yantai 264025, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.affiliation: College of Geography and Planning, Ludong University, Yantai 264025, China ; Shandong Provincial Key Laboratory of Soil Conservation and Environmental Protection, Linyi 276000, China.
authors.forename: Fuhong
authors.initials: F
authors.lastname: He
authors.affiliation: College of Geography and Planning, Ludong University, Yantai 264025, China.
authors.forename: Anding
authors.initials: A
authors.lastname: Zhang
authors.affiliation: Institute of Systems Science and Mathematics, NAAU, Yantai 264001, China.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Gu
authors.affiliation: School of Geodesy and Geomatics, Wuhan University, Wuhan 430072, China.
authors.forename: Yangmao
authors.initials: Y
authors.lastname: Wen
authors.affiliation: State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China.
authors.forename: Weiguo
authors.initials: W
authors.lastname: Jiang
authors.affiliation: Key Laboratory of Coastal Biology & Bioresources Utilization, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences (CAS), Yantai 264003, China ; Institute of Life Sciences, Qingdao University of Sciences & Technology (QUST), Qingdao 266042, China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Shao
mesh_terms: D002681:China; D003247:Conservation of Natural Resources; D017753:Ecosystem; D058998:Remote Sensing Technology