基于主成分-聚类分析的崩岗侵蚀强度评价  

Evaluation of Collapse Erosion Intensity Based on Principal Component and Cluster Analysis

作　　者：冯春杰 邓羽松 何溢钧 丁树文[1] 王天巍[1] FENG Chunjie;DENG Yusong;HE Yijun;DING Shuwen;WANG Tianwei(College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China;Guangxi Science and Technology Information Network Center,Nanning 530022,China)

机构地区：[1]华中农业大学资源与环境学院,武汉430070 [2]广西科技信息网络中心,南宁530022

出　　处：《水土保持研究》2019年第1期41-46,共6页Research of Soil and Water Conservation

基　　金：国家重点研发计划"红壤低山丘陵区水土流失演变规律与驱动机制"(2017YFC0505401);华中农业大学国家级大学生创新创业训练计划项目"地带性花岗岩土体风化特征及其与崩岗形成的关系"(201710504015)

摘　　要：为了研究湖北省通城县杨垄小流域崩岗群的崩岗侵蚀强度,提高评估的可靠性,使用RTK测量崩岗,获取崩岗面积、主沟坡降、内部平均坡度等11个参数,将其作为崩岗侵蚀强度分析的评价因子,通过主成分分析提取了崩岗侵蚀强度参数的4个主成分因子,得出选择的16个崩岗侵蚀强度。结果表明:杨垄小流域不同崩岗侵蚀强度分为3类:2号,5号,10号,11号为高度侵蚀;8号,15号,16号为中度侵蚀;其余为轻度侵蚀;小流域的中高度侵蚀型崩岗面积占崩岗群总面积的2/3以上,侵蚀面积较大。依据分类结果,可针对不同崩岗存在的风险因素制定对应的风险控制方案和措施,有利于崩岗的防治。In order to accurately examine the risk of sixteen collapsing valleys in the Yanglong Town of Tongcheng County,Hubei Province.A total of eleven parameters were selected as the factors for real-time kinematic analysis of the risk of collapse erosion,including area,main channel gradient,average internal slope and so on.Four principal component factors and the erosion intensities of the sixteen collapse valleys were obtained through principal component analysis.The erosion intensities of the 16 different collapsing gullies are divided into three categories:high-risk,moderate-risk and mild-risk according to cluster analysis.The high-risk group includes the second,fifth,tenth and eleventh collapse valleys.The moderate-risk group includes the eighth,fifteenth and sixteenth collapse valleys.The mild-risk group covers the other nine collapsie valleys.The results show that the area of moderate-risk and high-risk groups is larger and accounts for more than two-thirds of the total area of collapse valleys.The corresponding measures should be established on the basis of the risk factors of different collapse valleys according to the result,which is of significance for the prevention and management of the collapse valley.

关 键 词：小流域 崩岗 侵蚀强度评价 主成分分析 聚类分析 

分 类 号：S157.1[农业科学—土壤学]