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This paper proposed a frame concept of risk estimation related to debris flow process. The term risk is defined as the maximum potential loss of the elements towards debris flow within certain period in defined region. The quantitative estimation of risk related to debris flow process is established, and the concrete procedure to carry out the model is illustrated. According to IUGS, vulnerability...
Present bedload transport rate formulas, such as Einstein and Meyer-Peter formulas, failed to predict for high shear conditions. Experimentation and analysis demonstrated that mobile beds at high shear stress obey neither the smooth-boundary nor the rough-boundary law, but follow a different friction relation of their own. By deploying Guo's logarithmic matching method, this paper develops a uniform...
As one of the World Cultural Heritages, the Dujiangyan Irrigation System (DIS) has a history of 2,260 years. In 256 B.C, Li Bing, a governor of the Shu Prefecture (present Sichuan) of the Qin State, organized people in Sichuan to build the project based on the local geographic condition. The hydraulic headwork was composed of three interconnected projects as Yuzui, Feishayan,and Baopingkou, which...
On May 12, 2008, an earthquake of magnitude 8.0 as measured by the China Earthquake Administration occurred at Wenchuan, Sichuan Province in southwest China. As a result of the earthquake, geohazards approaching of about 20 thousands were triggered with the types of rock fall, rock avalanches, landside, debris flow and earthquake-lakes. After the Wenchuan earthquake occurred in 2008,rivers in the...
The local scour depth is a key parameter in the design of levee engineering. Based on experiment data, a non-dimensional analysis for the prediction of local scour depth of slanting stream is presented, The maximum scour depth is related to the approach flow velocity, flow depth, flow angle, slope of levee and the particle size of the bed sediment. The test experience formula for estimation of the...
Four motion states are supposed by Han: stationary, rolling, jumping and suspension. The step motion and unit motion are introduced as the fundamental concept of stochastic model. The unit motion consists of several steps of the same motions. For a long time, Markov process with discrete states and time is used to describing sediment interchanges near the flow bottom. Therefore, the transport process...
Dujiangyan Irrigation System lies on the Minjiang River in the northwest of Dujiangyan City Sichuan China. It was built over 2,200 years ago around 250 B.C. under the direction of LiBing, the governor of the Shu Prefecture of the Qin State. Construction of the Dujiangyan irrigation system began in the 3rd century B.C. This system still controls the waters of the Minjiang River and distributes it to...
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