黄土地区地面破碎,沟壑纵横,各级沟道下切很深,致使各种重力侵蚀作用非常活跃,从小型的崩落到大型的滑坡,从缓慢的连续性蠕动到高速的间歇性暴雨泥流都很普遍。而且重力侵蚀作用的分布也很广泛,尤其在丘陵沟壑区及残塬沟壑区,各种重力作用是沟道扩展及沟头前进的主要作用方式。 Loess area of ​​the ground broken, ravines aspect, deep trench at all levels, resulting in a variety of gravity erosion is very active, from small to large landslide landslides, from the slow continuous creep to high-speed intermittent heavy rain mud flow are universal. And the distribution of gravity erosion is also very extensive, especially in the gullies and valleys of gully areas. Various gravity effects are the main mode of action of channel expansion and ditch head advancement.