scholarly journals Debris-Flow Monitoring for the Set-Up of a Warning and Alarm System -Experiences from the Pyrenees-

2016 ◽  
Vol 9 (3) ◽  
pp. 107-113 ◽  
Author(s):  
Marcel HÜRLIMANN ◽  
Clàudia ABANCÓ ◽  
Jose MOYA ◽  
Marc BERENGUER ◽  
Ignasi VILAJOSANA
Keyword(s):  
Debris Flow ◽  
Alarm System ◽  
Flow Monitoring ◽  
Set Up

Debris flow monitoring in China

2020 ◽  
Author(s):  
Xiaojun Guo
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Flow Characteristics ◽  
Western China ◽  
Flow Density ◽  
Flow Depth ◽  
Jinsha River ◽  
Flow Monitoring ◽  
Jiangjia Gully ◽  
Set Up

<p><strong>Abstract: </strong>Debris flow monitoring provides valuable data for scitienfic research and early warning, however, it is of difficulty to sucessfully achive because of the great damage of debris flows and the high cost. This report introduces monitoring systems in two debris flow watersheds in western China, the Jiangjia gully (JJG) in Yunnan Province and the Ergou valley in Sichuan Province. JJG is loacted in the dry-hot valley of Jinsha River, and the derbis flows are frequent due to the semi-arid climate, deep-cut topography and highly weathered slope surface. A long-term mornitoring work has been conducted in JJG and more than 500 debris flows events has been recorded since 1965. The monitoring system consists of 10 rainfall gauges and a measuring section, with instruments to measure the flow depth and velocity; and flow density is measured through sampling the fresh debris flow body. Ergou lies in the Wenchuan earthquake affected area and the monitoring began in 2013 to investigate the characteristics and development tendency of post-earthquake debris flows. Three stations were set up in the mainstream and tributaries, with instruments to measure the flow depth, velocity, and density. Over 10 debris flow events were recorded up to date.</p><p>Based on the monitoring output, the rainfall spatial distribution and thresholds for debris flows are proposed. The debris flow dynamics characteristics are analyzed, and the relations between the parameters, e.g. density, velocity, discharge and grain compositions are presented. The debris flow formation modes and the mechanisms in different regions are discriminated and simulation methods are suggested. It is anticipated that the monitoring results will promote understanding of debris flow characteristics in the western China.</p><p><strong>Keywords:</strong> Debris flow, monitoring, rainfall, discharge, formation. </p>

Advanced Debris-Flow Monitoring and Alarm System at Spreitgraben

2014 ◽  
pp. 59-62 ◽  
Author(s):  
Mylène Jacquemart ◽  
Daniel Tobler ◽  
Christoph Graf ◽  
Lorenz Meier
Keyword(s):  
Debris Flow ◽  
Alarm System ◽  
Flow Monitoring

Risk Prevention Measures for Three-Tower and Four-Span Suspension Bridge under Vehicle Fire

2014 ◽  
Vol 919-921 ◽  
pp. 590-597
Author(s):  
Mu Yu Liu ◽  
Wei Tian ◽  
Ying Wang ◽  
Wu Jing ◽  
Xi Chen
Keyword(s):  
Reporting System ◽  
Suspension Bridge ◽  
Risk Prevention ◽  
Public Security ◽  
Alarm System ◽  
Prevention Measures ◽  
Fire Control ◽  
Emergency Rescue ◽  
Report System ◽  
Set Up

Risk prevention measures were put forward about vehicle burning in operating periods for three-tower and four-span suspension bridge, combining with the characteristics of bridge vehicle burning accident. The article set up a traffic reporting system of the tankers for a bridge, and determined the report system of tankers across the bridge. Tankers should passed in the middle of the lane near the median under the guidance of bridge manager. Significant indicators were set on both ends of the bridge, so that vehicles could shunt rapidly in extreme fire conditions. Department of public security, fire control, transportation, bridges management center should get together to establish accident emergency rescue leading group, and formulated the security system of fire resistance and rescue organization for YingWuzhou Yangtze river bridge. Video monitoring alarm system and fire control facilities were set up in side pier, side tower, middle of the main span and the middle tower, which provided reliable and prevention measures for bridge operation.

scholarly journals Analysis of debris-flow recordings in an instrumented basin: confirmations and new findings

2012 ◽  
Vol 12 (3) ◽  
pp. 679-686 ◽  
Author(s):  
M. Arattano ◽  
L. Marchi ◽  
M. Cavalli
Keyword(s):  
Debris Flow ◽  
Alluvial Fan ◽  
Seismic Network ◽  
Low Flow ◽  
Main Peak ◽  
Flow Monitoring ◽  
Irregular Pattern ◽  
New Findings ◽  
Seismic Recording ◽  
Seismic Networks

Abstract. On 24 August 2006, a debris flow took place in the Moscardo Torrent, a basin of the Eastern Italian Alps instrumented for debris-flow monitoring. The debris flow was recorded by two seismic networks located in the lower part of the basin and on the alluvial fan, respectively. The event was also recorded by a pair of ultrasonic sensors installed on the fan, close to the lower seismic network. The comparison between the different recordings outlines particular features of the August 2006 debris flow, different from that of events recorded in previous years. A typical debris-flow wave was observed at the upper seismic network, with a main front abruptly appearing in the torrent, followed by a gradual decrease of flow height. On the contrary, on the alluvial fan the wave displayed an irregular pattern, with low flow depth and the main peak occurring in the central part of the surge both in the seismic recording and in the hydrographs. Recorded data and field evidences indicate that the surge observed on the alluvial fan was not a debris flow, and probably consisted in a water surge laden with fine to medium-sized sediment. The change in shape and characteristics of the wave can be ascribed to the attenuation of the surge caused by the torrent control works implemented in the lower basin during the last years.

Debris flow monitoring in the French Alps

2014 ◽  
pp. 1589-1595
Author(s):  
C Bel ◽  
F Liébault ◽  
H Bellot ◽  
F Fontaine ◽  
D Laigle ◽  
...  
Keyword(s):  
Debris Flow ◽  
French Alps ◽  
Flow Monitoring

Comprehensive Mathematical Evaluation on Risk of Debris Flow

2011 ◽  
Vol 368-373 ◽  
pp. 829-833
Author(s):  
Fang Wei Liao ◽  
Xiao Liu ◽  
Ping Liu
Keyword(s):  
Debris Flow ◽  
Influence Factors ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Analytic Hierarchy ◽  
Geological Disasters ◽  
Risk Degree ◽  
Set Up ◽  
Mathematical Evaluation ◽  
Hierarchy Process

Debris flow is one of the usual mountain geological disasters, and it is significant to assess and forecast its risk degree. The paper bases on statistical analysis of influence factors of debris flow risk degree, establishing 15 indexes to accurately assess debris flow risk degree. Furthermore, the evaluation index system is constructed by using analytic hierarchy process. And after combining the linkages between indexes, calculating each weight, and amending repeatedly with examples, finally the comprehensive mathematical evaluation on risk of debris flow is set up.

scholarly journals On the evaluation of yield stress of soils for debris flow analysis

2019 ◽  
Vol 92 ◽  
pp. 05002
Author(s):  
Carlos Besso ◽  
Tácio Mauro Pereira de Campos
Keyword(s):  
Debris Flow ◽  
Yield Stress ◽  
Mass Movement ◽  
Flow Analysis ◽  
Rheological Parameters ◽  
Test Results ◽  
Slump Test ◽  
Acceleration And Deceleration ◽  
Cheap Alternative ◽  
Set Up

Debris flow materials behave as a fluid, hence its analysis requires rheological parameters such as yield stress and viscosity. Yield stress is associated to the start and the end of the mass movement downhill in the sense that it denotes the yield transition from the creep to the flow regime, i.e., passage from solid to fluid state. This paper presents an experimental study of the yield stress of a colluvium from Rio de Janeiro, through its determination in a modified set-up of the slump test and in a rotational parallel plate rheometer. Tests were performed in five different water contents above its liquidity limit, providing a fairly good relationship between yield stress and water content. While slump test provides yield stress related to the beginning of the movement (acceleration), rheometer results are related to flow's outset and stoppage. As a result, the percentual differences between yield stresses associated with acceleration and deceleration were less than 5% in all testes, which is related to the low hysteresis effect in the flow curves obtained in the rotational rheometer. Comparing the two methodologies, it is proposed a correction from rheometer to slump test results. Results obtained are compared with data presented in other studies involving soil's yield stress, showing a good acceptance of the slump test results as a cheap alternative to rheometers.

scholarly journals Debris-flow monitoring and warning: Review and examples

2019 ◽  
Vol 199 ◽  
pp. 102981 ◽  
Author(s):  
Marcel Hürlimann ◽  
Velio Coviello ◽  
Coraline Bel ◽  
Xiaojun Guo ◽  
Matteo Berti ◽  
...  
Keyword(s):  
Debris Flow ◽  
Flow Monitoring

Results and experiences gathered at the Rebaixader debris-flow monitoring site, Central Pyrenees, Spain

Landslides ◽  
2013 ◽  
Vol 11 (6) ◽  
pp. 939-953 ◽  
Author(s):  
M. Hürlimann ◽  
C. Abancó ◽  
J. Moya ◽  
I. Vilajosana
Keyword(s):  
Debris Flow ◽  
Monitoring Site ◽  
Flow Monitoring ◽  
Central Pyrenees
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