scholarly journals Results of site investigation and instrumentation of the Keno Gulch landslide/debris-flow source area, Aspen, Colorado

1997 ◽  
Author(s):  
A.F. Chleborad ◽  
W.L. Ellis ◽  
D.F. Kibler
Keyword(s):  
Debris Flow ◽  
Source Area ◽  
Site Investigation ◽  
Landslide Debris

scholarly journals The mechanism of landslide-induced debris flow in Geothermal area, Bukit Barisan Mountains of Sumatra, Indonesia

2021 ◽  
Author(s):  
Wahyu Wilopo ◽  
Teuku Faisal Fathani
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Volcanic Rocks ◽  
Thick Layer ◽  
Source Area ◽  
Site Investigation ◽  
Xrd Analysis ◽  
Alluvial Fan ◽  
Mountain Range ◽  
Geothermal Area

Landslides frequently occur in Indonesia, especially in the geothermal areas located on Sumatra's mountainous island. On April 28, 2016, around 04:30 Western Indonesia Time, a landslide-induced debris flow occurred in Lebong District, Bengkulu Province, Indonesia. The source area of the landslide was located at Beriti Hill on the Bukit Barisan Mountain Range. It resulted in 6 fatalities and damage to infrastructures such as geothermal facilities, roads, water pipes, houses, and bridges. Subsequent landslides and debris flows occurred on April 30, May 2, and 3, 2016. Therefore, this study aims to examine the mechanism and to know the most significant contributing factor to the Beriti Hill landslide. Site investigation, soil sampling, XRD analysis, and Lidar analysis were carried out in the research. Beriti Hill is a geothermal area with many manifestations and is composed of volcanic rocks. Alteration processes produced a thick layer of soil from volcanic rocks. The thick soil dominated by clay minerals and steep slopes is the dominant controlling factor of a landslide, triggered by high rainfall intensity. Debris flows are recurring events based on the Air Kotok river's stratigraphic data downstream of the landslide area. The debris flow material is toxic due to the low pH from the geothermal process. Therefore, the alluvial fan deposit area from Beriti Hill debris flow is a hazard zone and unsuitable for settlement and agriculture.

scholarly journals Analysis of a debris flow after Wenchuan Earthquake and discussion on preventive measures

2019 ◽  
Vol 23 (3 Part A) ◽  
pp. 1563-1570
Author(s):  
Zhi-Long Zhang ◽  
Jing Xie ◽  
De-Ke Yu ◽  
Zhi-Jie Wen
Keyword(s):  
Debris Flow ◽  
Wenchuan Earthquake ◽  
Preventive Measures ◽  
Impact Force ◽  
Site Investigation ◽  
The Wenchuan Earthquake ◽  
Formation Conditions ◽  
National Road ◽  
And Control ◽  
Debris Flow Disaster

This paper addresses a debris flow disaster in Yingxiu town after the Wenchuan earthquake. Through site investigation and data review, the geography and geological environment of the basin and the development, formation conditions and activity characteristics of the debris flow in the basin are analyzed. Calculate and analyze the characteristics of the debris flow, such as gravity, flow velocity and impact force. According to the management idea of combination of blocking and discharging, this paper proposes to arrange three blocking dams in the main ditch, construct drainage gullies in the downstream accumulation section, and prevent and control the aqueduct in the intersection of the main ditch and the G213 national road, which will be similar to the earthquake in the future. It is provided as a reference for research and prevention of the debris flow.

Spatial heterogeneity of debris-flow watershed

2021 ◽  
Author(s):  
Yingjie Yao
Keyword(s):  
Potential Energy ◽  
Debris Flow ◽  
Spatial Autocorrelation ◽  
Gravitational Potential ◽  
Source Area ◽  
Geospatial Analysis ◽  
Gravitational Potential Energy ◽  
Source Areas ◽  
Hypsometric Analysis ◽  
Inflection Points

<p>The intermittent surge is the basic manifestation of viscous debris flow, which emerges universally over the world, especially exemplified by those in Jiangjia Gully (JJG), a valley famous for its high frequency and variety of debris flow surges. It has been found that the surges originate from various sources in the watershed, thus identifying the source areas plays a fundamental role in studying the mechanism and process of surge developing. Advancement of GIS provides an apparent convenience in geospatial analysis of the watershed, which is used as a dominate tool in this paper.</p><p>In this study the JJG is divided into 97 tributaries (sub-watershed) and the hypsometric analysis is performed for each, from which derive the height of inflection points and the gravitational potential energy, coupled with the fitted parameters of specific power function. Then the morphology parameters, including slope, roundness, vegetation and soil, are revealed in tributaries. Besides, spatial autocorrelation among tributaries is quantified both globally and locally through Moran’s I and Getis-Ord G<sub>i</sub>*, so that the HI spatial distributions are quantified and visualized. In particular, hot spots are conspicuously visible and highlight the geologic meaning of the HI when exploratory spatial data analysis is applied to the data distributions through local indices of spatial autocorrelation.</p><p>The results show that H-curves approximately present as S-shaped, and the integral values (HI) range from 0.18 to 0.69 and show positive relationship with both gravitational potential energy and the height of the inflection points. By the HI value, the tributaries are identified as in 5 phases of evolution. The younger tributaries (HI>0.49) make up the majority, which are expected to be the main possible sources for debris flows. Additionally, the slope distribution of tributaries all conform to the extreme distribution while the curves for the upstream, where the HI of tributaries generally manifest higher coupled with larger roundness, tends to skew to the right.</p><p>Finally the correlation between possible sources are explored through geospatial analysis. The spatial association in JJG provides an explanation of the debris flow source areas. Global spatial autocorrelation manifests significantly clustered (Moran’s I shows 0.449, passing the significance test) while tributaries with high HI value concentrate mainly in the Menqian Valley. Moreover, the drainage form of Menqian Valley represents a large possibility of debris flow source area with the respect of that being in Duozhao Valley.</p><p><strong>Keywords: </strong>debris flow source area; hypsometric analysis; topographical characteristics; spatial autocorrelation; evolutionary phases</p>

Geotechnical Engineering Control on the Scenic Area — Research on the Method for Geological Disasters-Rockfall, Landslide and Debris Flow in Laoshan District of Qingdao

2012 ◽  
Vol 594-597 ◽  
pp. 3072-3079
Author(s):  
Yong Wei Zhang ◽  
Shu Cai Li ◽  
Xu Guang Chen ◽  
Wei Xu
Keyword(s):  
Debris Flow ◽  
Ecological Environment ◽  
Mountain Area ◽  
Geological Disasters ◽  
Engineering Control ◽  
Starting Point ◽  
Control Pattern ◽  
Qingdao City ◽  
Disaster Control ◽  
Landslide Debris

Compare with the other area, the geo-disaster control in scenic area is of specific, for it has the functional properties of fill the need of tourist of people. So the starting point is to protect the Ecological environment of scenic area. Most of the Chinese scenic areas locate on the mountain area and gully etc, which is the area with much geo-disaster. The geo-disaster controls on the scenic area getting more and more attention. In order to carry on the corresponding research， the Laoshan area in Qingdao City is taken as the engineering background, the geo-disaster control pattern is explored. The Laoshan area suffered rockfall, landslide, debris flow sometimes. There were casualties and property damage. On the basis of reconnaissance and risk analysis of geological disasters, Geotechnical Engineer controlling for typical geological disasters-rockfall, landslide, debris flow can get rid of the potential geological disasters and protect people's lives and property in Laoshan District. The geo-disaster control pattern solved the hidden danger in Laoshan scenic area, and it provides some experience for the geo-disaster control of other scenic area.

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