Forest Slope Stability Analysis applied the Science of Complexity

森林边坡稳定性分析应用了复杂性科学

基本信息

批准号：
15580126
负责人：
OMURA Hiroshi
金额：
$ 2.11万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15580126/
关键词：
Complexity Landslide Fractal Self Organized Criticality Slope Stability Disaster Mapping Sediment Run Off 地すべり崩壊竹林森林斜面

项目摘要

Landslides are important natural hazard in the mountainous areas and the slope stability is also important issue. For landslide mitigation and land use restriction, it is important to detect moving directions and travel distances as well as to find out the susceptible slopes with appropriate indexes. Fractal dimension "D" and other technology based on the science of complexity is expected to provide an index of susceptible level of the landslide moving direction or overlapping ratio that are needed in the screening method for detail site investigation of landslide in order to designate the restriction area of land use or countermeasures. This "D" is a mathematical theory that describes the quality of complex shapes. Countermeasures planning for areas that has complicated and concentrated landslides with high fractal dimension should be able to cover holistic area. Areas that have single landslides scattered over wide region with low fractal dimension should only have a simple plan for … More each local landslides. On the other hand, moving (traveling) or deforming directions of individual landslides are often difficult to decide, although they have conspicuous importance to the mitigation measures or the restriction designation of landslide hazard areas. In this context, Fractal dimension of landslide group is estimated, comparing with landslide area density, and moving directions, in western Japan. Consequently, the fractal dimension "D" from the different grid orientations for each landslide ranges 1.05-1.35. The other important results are referred below.Optimum values of D that are obtained from minimum grid number covering landslide perimeters should be used theoretically for the accurate judgment.In the area of Tertiary, they have a rather clear trend that as the relief energy increases the fractal dimension value also increases. In the Mesozoic, the trend is not clear. There is a clear trend in both of the geology that as the area density and overlapping ratio increase the value of fractal dimension also increases. So fractal dimension can express the area density and the overlapping ratio of the landslide simultaneously. The higher the overlapping ratio increases, the more complex the traveling distance is and the more detail investigation for mitigation is needed.The moving direction doesn't have dear relation with D. However, it tends to decrease as D increases in the high D region. It suggests that moving directions are similar in landslide groups that have high D characteristics. Adding to that, in some districts landslides tends to move simply towards the bottom of valley with the direction angle of 76-94 degree against the valley.Concerning with the bamboo stands expanding, the special Fractal dimension D increases as it increases. Therefore, D also can be an important index of invasion of bamboo stands that cause devastation of the slopes. Less

滑坡是山区重要的自然危害，坡度稳定也是重要的问题。对于缓解滑坡和土地利用限制，检测移动指示和旅行距离以及找到具有适当索引的易感插槽很重要。基于复杂性科学的分形维度“ D”和其他技术有望提供易感性水平的滑坡移动方向或重叠比率的指数，这些指数在筛选方法中需要详细介绍地点对陆地滑坡进行详细介绍，以指定土地使用或对抗的限制领域。该“ D”是一种数学理论，描述了复杂形状的质量。对具有高分形维度的复杂和集中滑坡的地区的对策规划应能够覆盖整体区域。具有单一滑坡的区域散布在宽阔的区域，其分形尺寸只有一个简单的计划……每个本地滑坡。另一方面，尽管它们对缓解测量值或限制性危险区域的限制设计具有显着意义，但通常难以决定移动（旅行）或变形的指示。在这种情况下，估计了滑坡组的分形维度，与日本西部的滑坡区域密度和移动指示进行比较。因此，每个滑坡的不同网格方向的分形尺寸“ d”范围为1.05-1.35。在下面引用了另一个重要的结果。从最小网格数获得的D最小值值应涵盖滑坡周围的最小网格数来进行精确判断。在第三纪区域，它们具有相当明显的趋势，即随着浮力能量的增加，浮力能量增加了分形值的值也会增加。在中生代中，趋势尚不清楚。两种地质都有明显的趋势，即随着面积密度和重叠比的增加，分形维度的价值也会增加。因此，分形尺寸可以表达面积密度和滑坡的重叠比。重叠比率的增加越高，行进距离越复杂，并且需要进行缓解的细节研究越多。移动方向与D的关系没有。然而，随着d的增加，它往往会降低。这表明在具有较高D特征的滑坡组中移动方向相似。除此之外，在某些地区，滑坡倾向于向山谷的底部移动，方向角度为76-94度，与山谷相对于山谷，随着竹林的扩张，特殊的分形维度D随着它的增加而增加。因此，d也可能是造成竹林的入侵的重要指数，造成斜坡破坏。较少的