Papers by Author: Chuan Qi Li

Abstract: Physical and numerical model studies were performed in order to study the flow conditions for the proposed pump station of Shuangwangcheng reservoir, Shouguang Ctiy. The flow velocity and the pressure distribution in the bidirectional culvert of Shuangwangcheng Pump Station had been obtained by hydraulic model test and numerical simulation. The physical model was constructed to a Froude scale of 1:20. A general conclusion was that, the computed results were good agreement with the data measured in physical model, and could be good complement for physical model test. Furthermore, negative pressure existing in discharge steep culvert in the initial scheme design was eliminated by moving the culvert controlling gate to the end of culvert in the modified scheme, and the flow conditions was improved.

Abstract: Based on the theory of risk analysis, this study develops a LHS –MC method to evaluate dam overtopping probability that accounts for the uncertainties arising from wind speed and peak flood. LHS method is used to generate samples of peak flow rate and wind speed especially for rare events. One example of dam overtopping risk analysis is presented to demonstrate the validity and capability of the proposed method. By means of numerical example, it is shown that LHS method is efficient which tends to convergence within a few simulation times. Reservoir routing, which incorporates operation rules, wind setup, and run-up, is used to evaluate dam overtopping probability.

Abstract: Risk analysis of slope instability in earth dams is presented using LHS –MC method. Latin hypercube sampling (LHS) is suggested as a tool to improve the efficiency of MC random sampling method. One example of risk analysis for dam slope instability is presented to demonstrate the validity and capability of the proposed method. By means of numerical example, it is shown that about 25% of the calculations can be saved by using LHS –MC method instead of simple MC. The exact savings, however, are dependent on details in the use of LHS and on the shape of the failure surfaces of the problems.