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A Study on Mapping of Potentially Unstable and Shallow-Seated Landslide Slopes in the Hilly Mountainous Regions, Northeast Japan

日本东北部丘陵山区潜在不稳定浅层滑坡测绘研究

基本信息

批准号：
17500696
负责人：
OTSUKI Yoshinori
金额：
$ 1.86万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17500696/
关键词：
Landslide Granitoid Neogene Sedimentary Rocks Natural Hazard Landslide Disaster Disaster Prevention Slone Process

项目摘要

The purpose of this study is to clarify the mapping method of potentially unstable slopes under heavy rainfall condition by using parameters related to the topography, geology and vegetation of actual shallow-seated landslides, and to discuss the relationships between the unstable areas and slope units.In granitoid areas, the Abukuma Mountains, the critical safety factors which distinguish between unstable and stable slopes are presented by both geologic and vegetational conditions, on the basis of the field observations and soil mechanical experiments. In consideration of the thickness of decomposed granite soils and the slope gradient, it becomes clear that the unstable areas are concealed partly in the upper valley-side slopes, especially in the uppermost parts of them, which are considered to be relatively stable in general. It is therefore necessary to study further the relationships between classification of slope units and the processes of slope evolution from the view of micro landform classification.On the other hand, surface landslides occur mainly in the lower valley-side slopes in the Neogene sedimentary rocks area, the Tomiya Hills. To make discrimination between the unstable and stable slopes in the Neogene areas should be discussed continuously as a future issue, because the critical state of the shallow-seated landslides occurring could not be currently revealed. In this regard, the landslide appearance and the changes of the soil moisture of valley-side slopes in the Neogene volcanic rocks area, the central highland of Kenya, could be made clear from the field survey and slope hydrological observations, where the topographical conditions are appreciably similar to those in the above-mentioned areas.

本研究的目的是利用实际浅层滑坡的地形、地质和植被等相关参数，明确强降雨条件下潜在失稳边坡的填图方法，并探讨失稳区与边坡单元之间的关系。在野外观测和土壤力学试验的基础上，从地质条件和植被条件两个方面提出了Abukuma山花岗岩区不稳定边坡和稳定边坡的临界安全系数。考虑到分解花岗岩土的厚度和边坡坡度，可以清楚地看出，不稳定区部分隐藏在山谷边坡的上部，特别是在山谷边坡的上部，总体上被认为是相对稳定的。因此，有必要从微观地貌分类的角度进一步研究边坡单元分类与边坡演化过程的关系。另一方面，地表滑坡主要发生在新近纪沉积岩区富宫山的低谷侧斜坡上。新近纪浅层滑坡发生的临界状态目前还不能完全揭示，因此判别不稳定边坡和稳定边坡是今后需要继续讨论的问题。在肯尼亚中部高地新近系火山岩区，地形条件与上述地区有明显的相似，通过野外调查和坡面水文观测，可以清楚地了解山谷边坡的滑坡形态和土壤水分的变化。