IMHE OpenIR  > 山地灾害与地表过程重点实验室
Real-time measurement and preliminary analysis of debris-flow impact force at Jiangjia Ravine, China
Hu, Kaiheng1,2; Wei, Fangqiang1,2; Li, Yong1,2
Corresponding AuthorHu, KH
2011
Source PublicationEARTH SURFACE PROCESSES AND LANDFORMS
ISSN0197-9337
EISSN1096-9837
Volume36Issue:9Pages:1268-1278
SubtypeArticle
AbstractImpact forces associated with major debris flows (Jiangjia Ravine, China, August 25, 2004) were recorded in real time by a system consisting of three strain sensors installed at different flow depths. This provides the first real-time and long-duration record of impact forces associated with debris flows. A comprehensive approach including low-pass filtering and moving average methods were used to preprocess the recorded signals. The upper limit of impact frequency in the debris flows was estimated at 188.66 Hz under the assumption that only coarse grains cause effective impact loadings. Thus, a low-pass filter with a 200 Hz cut-off frequency was needed to denoise the original data in order to extract the impact force. Then the moving average method was applied to separate long-term and random components of the filtered data. These were interpreted as, respectively, the fluid pressure and grain impact loading. It was found that the peak grain impacts at different depths were non-synchronous within the debris flows. The impact loadings were far greater than, and not proportional to the fluid pressures. Analysis of the impact force of 38 debris flow surges gives an empirical value for the ratio of the hydrodynamic pressure to the momentum flow density, i.e. the product of debrisflow density and mean velocity square, which provides a very valuable basis for understanding debris flow dynamics and designing debris flow management systems. Copyright (C) 2011 John Wiley & Sons, Ltd.
KeywordDebris Flow Impact Force Hydrodynamic Pressure Jiangjia Ravine
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/esp.2155
WOS Subject ExtendedPhysical Geography ; Geology
Indexed BySCI
WOS KeywordAVALANCHES ; CAMPANIA
Language英语
Quartile3区
TOP
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000292252000012
Funding OrganizationNational Natural Science Foundation of China(40771026 ; Chinese Academy Sciences(KZCX2-YW-Q03-5) ; 40701014)
Citation statistics
Cited Times:91[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5504
Collection山地灾害与地表过程重点实验室
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Hu, Kaiheng,Wei, Fangqiang,Li, Yong. Real-time measurement and preliminary analysis of debris-flow impact force at Jiangjia Ravine, China[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2011,36(9):1268-1278.
APA Hu, Kaiheng,Wei, Fangqiang,&Li, Yong.(2011).Real-time measurement and preliminary analysis of debris-flow impact force at Jiangjia Ravine, China.EARTH SURFACE PROCESSES AND LANDFORMS,36(9),1268-1278.
MLA Hu, Kaiheng,et al."Real-time measurement and preliminary analysis of debris-flow impact force at Jiangjia Ravine, China".EARTH SURFACE PROCESSES AND LANDFORMS 36.9(2011):1268-1278.
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