Stochastic Characteristics of Cobble-Gravel Bed Load Transport

by Shuyou Cao, San Diego State Univ, United States,
Fang Duo, San Diego State Univ, United States,
Chuanyi Zhang, San Diego State Univ, United States,

Document Type: Proceeding Paper

Part of: Soil Properties Evaluation from Centrifugal Models and Field Performance


Prototype tests of stochastic characteristic of cobble-gravel bed load transport have been done in Dujiangyan reach of Minjiang River in China in 1977-1985. All of 718 sample data from 20 set tests show that the maximum transport rates of cobble-gravel bed load are often hundreds to ten thousands times as much as the minimum rates, and the maximum transport rates are 5-25 times greater than that of time-average on the constant external conditions. The transport rate of cobble-gravel bed load is influenced by a rather large number of factors which form a series of random variables. Those factors cause the rate to be a random variable. In this paper the rate is verified by the Central Limit Theorem of probability theory as a random variable which satisfies the lognormal probability distribution. Kolmogorov-Smirnov Test was used to judge the theoretic probability distribution function. The test shows that the theoretical probability distribution can be accepted at a 95% level of confidence.

Subject Headings: Probability | Bed loads | Load tests | Stochastic processes | Rivers and streams | Probability distribution | Transport rates | China | Asia

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