黄土高原重力侵蚀的地质地貌因素分析--从发生的规模频度看区域特征

在按规模和频度对黄土高原重力侵蚀分类的基础上,分析了重力侵蚀具有普遍性、沿河谷分布、区域差异明显等区域分布特点。并分析了地质地貌因素对各种主要重力侵蚀形成与分布的影响:塌陷在碳酸盐地层存在地分布较多,高陡边坡地区易于形成巨大滑坡,群发性崩塌、滑坡以及泥流的形成多发生在沟谷密度较大地区,巨大泥流的形成在沟头地区多有较大的汇水面积等。因此在防治重力侵蚀过程中,必须充分地研究各地的地质地貌条件,因地制宜地防治不同类型的重力侵蚀。

Geological and Geomorphological Conditions of Mass Movements in the Loess Plateau--Regional Characteristics From the Viewpoint of Magnitude and Frequency of Event Occurrence

The authors investigated the distribution of mass movements in the Loess Plateau by means of field survey and mapping based on the magnitude and frequency of them.We found the following regional characteristics of mass movement occurrence:(1) mass movements broadly occur along river valleys in the Loess Plateau;(2) the occurrence obviously shows regional difference;(3) the geological and geomorphological conditions strongly affect the occurrence and distribution of mass movements.For instance,sink holes mainly occur at the place where carbonate rock exists,large landslides occur along the cliffs that have a great altitudinal difference,small and frequent landslides and mud flows occur at the place where drainage density is high,and great mud flows occur with the large drainage area.These results indicate that the geological and geomorphological conditions must be considered in order to prevent mass movements in the Loess Plateau.