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Hydrological and geomorphic study on immunity of hillside slope against slope failure

山坡抗滑坡能力的水文地貌研究

基本信息

批准号：
14560121
负责人：
HIRAMATSU Shinya
金额：
$ 2.24万
依托单位：
Shinshu University (2004)Kochi University (2002-2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

In Japan, hillside landslides occur frequently in rainy seasons and give the great damage to human life and public property. Hillside landslides are triggered mainly by rainfall. This study was carried out to clarify causes of differences and variations of possibility of sediment yield. Cohesion and bulk density of forest soil got exponentially small and porosity of forest soil got large, in proportion to years after a weathering. In order to understand effects of forest roots (living-root and decayed-root) on hydrologic processes, that is, water movement in soil layer, field sprinkling experiments were carried out on a hill slope in the non-rainy area. The following matters were confirmed by these field experiments. Rainwater concentrates on the surroundings of forest roots. And, runoff from surrounding of forest roots in steady state increases approximately with rainfall intensity and follows Manning's low. On the other hand, runoff inside porosity of soil follows Darcy's low.Furthermore, Evaluation model of dangerous condition to hillside landslides considering both of glowing of thickness of soil layer and possibility of rainfall was made. And this model was applied to small slope in the rainy area and non-rainy area. As the result of numerical simulation, slope stability decrease, in proportion to amount of rainfall and years after a weathering in both area. The critical amount of rainfall in rainy area was large 300mm/day from that in non-rainy area. On the other hand, the index of slope stability in rainy area was almost the same as that in non-rainy area. As a result of this numerical simulation, it was clarified that the immunity against slope failure in rainy area was larger than that in non-rainy area.

在日本，希尔赛德滑坡在雨季时有发生，给人民生命和公共财产造成了巨大的损失。希尔赛德滑坡主要由降雨引发。本研究的目的是为了阐明产沙可能性差异和变化的原因。土壤的粘聚力和容重随风化年限的增加呈指数规律减小，孔隙度随风化年限的增加而增大。为了解森林根系（活根和腐根）对土壤水文过程即土壤水分运动的影响，在非降雨区的山坡地进行了野外喷灌试验。这些田间试验证实了以下事项。雨水集中在树根周围。在稳定状态下，林分根系周围的径流量随降雨强度的增大而增大，遵循曼宁定律。另一方面，土壤孔隙内的径流遵循达西定律。在此基础上，建立了同时考虑土层厚度变化和降雨可能性的滑坡危险性评价模型。并将该模型应用于多雨区和非多雨区的小边坡。数值模拟的结果表明，这两个地区的边坡稳定性下降，与降雨量和风化后的年限成正比。多雨区的临界降雨量比非多雨区大300 mm/d。降雨区边坡稳定性指标与非降雨区基本一致。数值模拟结果表明，多雨地区边坡对破坏的免疫力大于非多雨地区。

项目成果

期刊论文数量（17）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Influence of forest roots on infiltration and runoff of rain water in forest soil

林根对森林土壤雨水入渗和径流的影响

DOI：
发表时间：
2005
期刊：
Volume summary of research exhibition, the Japan society of Erosion Control Engineering
影响因子：
0
作者：
Shinya Hiramatsu;Takashi MIYAMAE;Tadaaki IWAO;Mikiko MAEKAWA
通讯作者：
Mikiko MAEKAWA

Relationship between warm season precipitation and highest hourly and daily precipitation based on AMeDAS data

基于AMeDAS数据的暖季降水与最高小时和日降水量的关系