权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

APROBABILISTIC PREDICTION MODEL ON SEDIMENT PRODUCTION IN MOUNTAIN REGION

山区产沙量概率预测模型

基本信息

批准号：
17560458
负责人：
FUJITA Masaharu
金额：
$ 2.39万
依托单位：
Kyoto 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 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560458/
关键词：
Sediment production Freeze and thaw Weathered bedrock Bare slope Landslide Shallow slope failure Global warming Reservoir sedimentation 堆砂量地中温

项目摘要

It is important to develop a model describing the essential points of usual or unusual sediment production process to estimate precisely the sediment production rate. In this research, taking up the sediment production due to freezing and thawing as a usual event and the slope failure as an unusual event, we have proposed the fundamental models that could provide the probabilistic properties of sediment production if the probability density functions of atmospheric and hydrological variables are introduced into the models. Firstly, we have developed a model for freezing and thawing process on bare slopes. Air temperature, wind velocity and solar radiation are included in the model as the parameters and also slope angle and direction can be considered. Therefore, an advantage of the model is applicable for any slopes in the world where the atmospheric, hydrological and topographical data are available. The validity of the model was verified by comparison between the observation data and the simulation result for Mt. Tanakami and the Takahara river basin. A transformation process from weathered bedrock to soil should be investigated, but this model could be developed as an evaluation model for the influence of the global warming on the sediment production. Secondly, we have proposed a numerical model on slope failure considering the soil pipes inside of slopes. Using the model, we discussed the influence of soil pipes and the piles clogging on the occurrence of slope failure. Also, we have investigated the characteristics of slope failure for two different types of slope, namely, two slopes sustained mainly by cohesion force or friction force. For the former, a long collapse with much water content occurs, and for the latter, a phased slope failure composed of short collapses take place.

建立一个能描述一般或异常产沙过程的模型，对精确估算产沙率具有重要意义。在本研究中，考虑到由于冻结和融化的泥沙生产作为一个常见的事件和边坡失稳作为一个罕见的事件，我们提出了基本的模型，可以提供的概率特性的泥沙生产，如果引入大气和水文变量的概率密度函数的模型。首先，我们建立了一个裸坡冻融过程的模型。模型中的参数包括气温、风速和太阳辐射，还可以考虑坡度和坡向。因此，该模型的一个优点是适用于世界上任何一个斜坡，在大气，水文和地形数据。通过对内蒙古自治区的观测数据与模拟结果的比较，验证了模型的有效性。田中和高原河流域。风化基岩向土壤的转化过程有待研究，但该模型可作为全球变暖对产沙影响的评价模型。其次，建立了考虑土管作用的边坡失稳数值模型。利用该模型讨论了土管和桩体堵塞对边坡破坏的影响。此外，我们还研究了两种不同类型的边坡，即两个主要由粘聚力或摩擦力维持的边坡的破坏特征。前者是含水量较大的长段崩塌，后者是由短段崩塌组成的阶段性边坡破坏。