Comparison of high-resolution TRMM-based precipitation products during tropical cyclones in the North Indian Ocean |
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Authors: | Prakash Satya Mahesh C Gairola R M Pal P K |
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Institution: | (1) Key Laboratory of Mountain Hazards and Surface Process, Chinese Academy of Sciences, Chengdu, 610041, China;(2) Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Conservancy, Chengdu, 610041, China;(3) State Key Lab of Geohazard Preventions, Chengdu, 610059, China;(4) Graduate University of Chinese Academy of Sciences, Beijing, 100039, China; |
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Abstract: | Debris flow moves in the form of surge waves and consists of dozens or even hundreds of surges that are separated in time
and space and have a variety of appearances, as exemplified in Jiangjia Gully, China. Observations there indicate that the
deposit is made up by superposition of successive surges and deposit of a single surge is in effect a “frozen” surge. Then
the study of debris flow is reduced to the study of surge sequence, which leads to a probabilistic picture of debris flow.
This study attempts to find the probability distribution of velocity of surge using a huge data set of Jiangjia Gully. Statistics
of the data shows that the velocity satisfies the Weibull distribution, which is believed to be universally valid because
the distribution parameters vary little between events, with the shape parameter being well related to the average of velocity.
It follows that the same distribution applies also to other quantities of debris flow, such as the flow depth and the discharge.
Therefore, the distribution can be used to assess the magnitude and overflow range of a potential debris flow, as well as
to the parameter calculation for engineering design. |
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