摘要
冲沟跌坎是沟道中一种特殊的地貌现象,跌坎的产生显著改变了沟道中的水动力学特征,从而对沟道演化产生影响。为了揭示元谋干热河谷区冲沟跌坎的类型及其形成条件,对研究区内234个冲沟跌坎的类型、形态特征、分布位置进行了实地调查与勘测。结果表明:1)依据引起冲沟跌坎发育的主要因素不同,将跌坎划分为异质型跌坎、诱发型跌坎、障碍型跌坎和断层型跌坎4种类型,不同类型跌坎的形态特征各有差异;2)冲沟跌坎的发育主要受到侵蚀基准面、构造条件、岩性条件、地形条件以及植被因素的综合影响。研究结果揭示了干热河谷冲沟跌坎的基本类型、形态特征及形成机理,也有助于理解冲沟侵蚀的机制,为冲沟控制提供科学依据。
Gully step-pools are the special geomorphological phenomenon in the channel. It can significantly change the characteristics of flow dynamics in the channel. In order to reveal the types and forming conditions of gully step-pools,in January 2017,we made an on-the-spot investigation for 234 gullies step-pools on its types,morphological characteristics,and distributions in Yuanmou district. The analysis results show： 1） Gully step-pools are divided into 4 types in terms of its main forming causes： heterogeneous type of step-pool,induced step-pool,barred step-pool and fault-caused step-pools. Different types of step-pools have different morphological characteristics. 2） The development condition of gully step-pool is influenced by the base level of erosion,tectonic condition,lithological conditions,terrain conditions and vegetation. The types are diverse and the morphology is complex. The results revealed the basic types,morphological characteristics and forming mechanism,also are helpful to understand the mechanism of gully erosion and provides the scientific basis to control gully erosion.
作者
贺春明
吴强建中
邓青春
向卫
HE Chunming;WU Qiangjianzhong;DENG Qingchun;XIANG Wei(College of Land and Resources, China West Normal University, Nanchong 637009, Chin)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2018年第7期180-187,共8页
Journal of Arid Land Resources and Environment
基金
四川省教育厅项目(17ZB0428
17AZ0385)资助
关键词
干热河谷
冲沟跌坎
类型
形成条件
dry - hot valley
gully step - pool
types
controlling factors
