鄂东南花岗岩区节理对崩岗发育的影响

发布时间：2018-03-14 13:33

  本文选题：崩岗　切入点：节理　出处：《水土保持研究》2017年03期 　论文类型：期刊论文

【摘要】：崩岗是鄂东南花岗岩地区普遍存在的土壤侵蚀现象,给农业生态与经济发展带来了严重影响。研究以鄂东南通城县杨垄小流域崩岗为研究对象,使用RTK测量数据,ArcGIS生成DEM图像,测定坡面坡向及主沟、支沟的发展方向,运用罗盘测量节理产状,描述节理的区域性特征,探讨了节理对崩岗发育的影响。结果表明:杨垄小流域节理产状具有方向性和区域性,多为NE45°—90°和NW280°—310°;崩岗主沟发展方向主要受坡面坡向的影响,多位于北东向;崩岗支沟的发育在一定程度上受节理走向的影响,多分布于NE45°—90°和NW280°—320°;节理倾角大,节理面陡可加快崩岗的侵蚀与发育;节理可加快地下水的下渗,有利于风化壳的形成,加速崩岗侵蚀。研究结果可为探究崩岗地貌系统侵蚀机理及其治理方法研究提供依据。
[Abstract]:Collapse is a widespread phenomenon of soil erosion in granite area of southeastern Hubei Province, which has brought serious impact to agricultural ecology and economic development. This paper takes Yanglong small watershed of Tongcheng County in southeastern Hubei Province as the research object, and uses RTK data to generate DEM image. The development direction of slope direction, main trench and branch ditch on slope surface is determined. The joint occurrence is measured by compass, and the regional characteristics of joint are described. The results show that the joint occurrence in Yanglong small watershed is directional and regional, most of them are NE45 掳-90 掳and NW280 掳-310 掳, the development direction of main gully is mainly influenced by slope direction, most of them are located in the north east direction. To some extent, the development of the gully is affected by the strike of the joint, which is distributed in NE45 掳-90 掳and NW280 掳-320 掳, the steep joint surface can accelerate the erosion and development of the collapse, and the joint can accelerate the infiltration of groundwater, which is beneficial to the formation of weathering crust. The results can provide a basis for the study of erosion mechanism and treatment methods of landslide geomorphology system.
【作者单位】： 华中农业大学资源与环境学院;
【基金】：国家自然科学基金重点项目“花岗岩风化岩土体特性的地带性分异及崩岗形成机理研究”(41630858);国家自然科学基金“花岗岩红壤优先流及其与崩岗侵蚀发育的关系”(41571258) 华中农业大学国家级大学生创新创业训练计划“花岗岩崩岗不同层次土壤可蚀性与抗冲性对龛形成的影响”(201510504021)
【分类号】：S157.1
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本文编号：1611428