感受帕隆天险

青藏高原既是世界上最高的高原,同时也是地球上最年轻的高原.专家们通过地质历史考察发现,早在400多万年前,现在的青藏高原南部还是汪洋一片,后来受来自印度板块次大陆与欧亚主大陆碰撞的影响,致使青藏高原逐步隆起.     

Bottom Factors Applied to the Zoning Study of the Risk Levels of Landslides in the Three Gorges Reservoir Area

Without taking inducing factors into consideration, this paper adopts a quantitative analysis of the bottom factors in the Three Gorges Reservoir area, studies the relationship between the bottom factors and the development of landslides, and then zones the area according to risk levels. The bottom factors adopted in this paper include lithological characters（U1 ）, gradient（U2 ）, slope form （U3）, difference of helght（U4 ）, and slope orientation（U5 ）. In 4 650 km^2 of the studied area, the areas of the very high, high, medium and low hazard degree area respectively were 57. 94 km^2 , 2 305.15 km^2, 1 241.6 km^2, 1 045.31 km^2. The methodological steps are （1） inversion statistic analysis, （2） the analysis of contribution ratio and weighing, （3） getting results via fuzzy evaluation of risk levels.     

Deformation and Development Tendency of Shiliushubao Landslide by Numerical Modeling

On the basis of analysing basic features of Shiliushubao landslide, the landslide＇s deformation and development tendency are quantitatively studied by using FLA^3D program. The results accord with monitoring results. The results are indicated that resevoir impounding accelerates the landslide＇s deformation, and the variation of reservoir water level is key factor of affecting the deformation; The landslide has the characters of pull-behind move ment according to the displacement of the landslide body gradually reducing from leading edge to trailing edge; Excavating and deloading slow down the landslide＇s deformation in the certain degree. On the basis, the deformation developmental tendency of Shiliushubao landslide is predicted by the established simulating model.     

山崩地裂 地震奇观——翠华山国家地质公园

在西安市南郊20km的秦岭北坡,有一处山崩裂石堆积成的地貌景观,这就是翠华山国家地质公园的主要景点。     

Dynamical Mechanisms of Effects of Landslides on Long Distance Oil and Gas Pipelines

According to the investigations on the oil and gas pipelines such as the Lan-Cheng-Chong pipeline and the Southwest pipeline, there are two ways of laying pipeline： pipelines paralleling （approximately） to the main slide direction and pipelines perpendicular （approximately） to the main slide direction. If earth-retaining walls have been built for pipelines paralleling to the main slide direction, they will prevent the lands from sliding; On the contrary, without earth-retaining walls, the sharp broken rocks in the backfilling soil will scratch the safeguard of the pipeline when the landslides take place. Pipelines perpendicular to the main slide direction can be classified into four types according to the relative positions between pipelines and landslides： Pipelines over the slide planes, pipelines inside the fracture strips of slide planes, pipelines below the slide planes and pipelines behind the backsides of landslides. The different dynamical mechanisms of the process in which landslide acts against pipelines are analyzed based on whether the pipelines are equipped with fixed frusta, because the sliding resistance depends on whether and how many fixed frusta are equipped and the distance between frusta.     

Assessment and Risk Zonation of Landslides in Panxi Area Based on 3S Technology

0IntroductionThe Panxi Area is situated at the Valley ofJialing River with rich products and hugedeveloping potentials,anditis ani mportant ecolo-gy barrier of maintaining the ecological environ-ment stable of Sichuan Province and even that ofthe whole China[1].At the same ti me,the PanxiAreais an ecology frail area,andits one of obvi-ous expressionsis the frequent occurrence of geo-logical disaster[2,3].According to the investigation[4],there are5148debris flows with drainage area above0.…     

Occurrence Conditions and Process Analysis on Fluidization of Valley Type Landslide： Example of the Fluidization of Landslide in Qiongshan Ravine, Danba

0IntroductionFluidization of landslideindicates the action andprocess of an alivelandslide motion of conver-ting fromsliding state to fluidal disposition due tovibration and watering function occurred in processof landslide’s mediumand high velocity movement.Research onfluidization of landslide is a major sub-ject inthe field of landslide and debris flowstudies,which has a significance of deepening people’s un-derstanding of landslide disaster and rules of debrisflow occurrence.For example,S…     

Landslides and Slope Aspect in the Three Gorges Reservoir Area Based on GIS and Information Value Model

Slope aspect is one of the indispensable internal factors besides lithology, relative elevation and slope degree. In this paper authors use information value model with Geo graphical Information System （GIS） technology to study how slope aspect contributes to landslide growth from Yunyang to Wushan segment in the Three Gorges Reservoir area, and the relationship between aspect and landslide growth is quantified. Through the research on 205 landslides examples, it is found that the slope contributes most whose aspect is towards south,southeast and southwest aspect contribute moderately, and other five aspects contribute little. The research result inosculates preferably with the fact. The result of this paper can provide potent gist to the construction of Three Gorges Reservoir area in future.     

巨型海啸毁灭之浪

美国东海岸沿线是全球人口密度最高的地区之一,有4000万人在这里安居乐业,然而,他们丝毫不知自己正生活在一个巨大的灾难阴影之下。有证据表明,终有一日一种巨型海浪将会毁灭美国东海岸。这种海浪比任何普通的潮汐性海浪或者海啸都大得多,科学家们称之为“巨型海啸”,简称“巨啸”。     

人造卫星日夜监视山崩

从哥伦比亚起,向南至阿根廷帕塔戈尼亚,这个广大的地带由于地震发生过于频繁,因此地震发生后很少向外部世界报道。然而,无论是火山活动还是地震或暴雨,都会导致泥石流倾泻而下,将沿途的一切破坏殆尽。最大的受害者是人。1998年初,一场暴雨袭击厄瓜多尔,7座住房被泥流掩埋,房子中的17个人全部遇难。十多年前,在厄瓜多尔北部,一场地震导致山体崩塌,罹难者在千人以上。此外,这个国家的石油管道遭到破坏,石油出口被迫中断好几个月,政府收入遭到严重损失。在哥伦比亚,1985年内瓦多火山爆发,整个阿麦罗城被摧毁,25000人遇难。