黄土高原沟壑区小型重力侵蚀影响因素分析

Analysis on the Small Gravitational Erosion Factors in Gully Region of the Loess Plateau

小型重力侵蚀是黄土高原沟壑区流域产沙的重要来源。影响小型重力侵蚀的因素很多,根据野外实际观测,研究和讨论了沟道发展阶段、沟坡坡度、土体风化、土体蠕动、植被发育、降雨等因素对小型重力侵蚀的影响。结果表明:沟坡土体的风化和蠕动是小型重力侵蚀的重要影响因素,沟坡坡度是决定小型重力侵蚀特点和强度的主要限制性因素,降雨是小型重力侵蚀的重要触发因素,植被的发育对小型的重力侵蚀有比较明显的抑制作用。

Small gravitational erosion is a very important agent for sediment yield in the gully region of the Loess Plateau.There are many influence factors for the generation of the gravitational erosion.Based on field observation,some factors,such as development stages of the channel,degree of the slope,weathering grade and creeping of the regolith,vegetation,rain and so on,are discussed in this paper.We concluded that weathering grade and creeping of the regolith are important influence factors for the small gravitational erosion.Slope degree is controling facors which determines the intensity and scale of the small gravitational erosion.Rain is important triggering factor for the occurrence of small gravitational erosion.And the development of the vegetation can restrain occurrence of the small gravitation erosion to some extent.