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Landslide Periodicity and Prediction of Potential Landslide Sites

滑坡周期性和潜在滑坡地点预测

基本信息

批准号：
61560174
负责人：
SHIMOKAWA Etsuro
金额：
$ 1.47万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1988
项目状态：
已结题

项目摘要

Shallow landslide repeatedly occurs at a same slope site as a principal factor of slope development in forested drainage basins under warm and humic climate. in this type of landslide, recurrence of the landslide at the same slope site requires formation of the topsoil as sliding materials.The subjects of the study are to make clear the mechanism of landslide periodicity and to predict the potential sites for the shallow landslide based on the landslide periodicity.The results are summarized as follows;1. Many newer and older landslide scars have formed on steep slopes of two research areas, kagoshima-shi and shibisan, kagoshima prefecture, japan, composed of pyroclastic flow deposits and decomposed granite, respectively. The recurrence intervals of landslide at the same slope site are more than 80-100 years at the kagoshima-shi research area and more than 200 years in the shibisan research area, respectively.2. The topsoil has reformed on the landslide scars with lapse of time associated with invasion of plants. The formation of topsoil is mainly due to physical and mechanical processes during a period of less than 100 years after landsliding at the pyroclastic flow deposits area. While the formatiom of topsoil is due to chemical processes as well as the physical and mechanical processes at the decomposed granite area. The potential landslide sites which are old landslide scars with deep topsoil are predicted based on the landslide periodicity. The topsoil is closely related the vegetation on the scars, therefore the potential landslide sites can be predicted by using of the vegetation as an index.

在温暖湿润气候条件下，浅层滑坡在同一坡位上反复发生是森林流域坡面发育的主要因素。在这种类型的滑坡中，同一坡位上的滑坡重复发生需要形成作为滑动材料的表层土，本研究的目的是弄清滑坡周期性的机理，并根据滑坡周期性预测浅层滑坡的潜在发生部位。在日本鹿儿岛县鹿儿岛市和志必山两个研究区的陡坡上，分别形成了由火山碎屑流沉积物和风化花岗岩组成的更新和更老的滑坡疤痕。同一坡位的滑坡重现期，鹿儿岛市研究区大于80-100年，石壁山研究区大于200年.随着时间的推移，植物的入侵，表土在滑坡疤痕上进行了改造。火山碎屑流沉积区表层土的形成主要是由于滑坡后不到100年的物理和机械过程。而表土的形成是花岗岩风化区的物理和机械作用与化学作用共同作用的结果。根据滑坡的周期性，预测了潜在的滑坡点，这些潜在的滑坡点是具有深厚表土层的老滑坡遗迹。表土与坡痕上的植被关系密切，因此，可以用植被作为滑坡预测的指标。