《航运枢纽冲沙过程非恒定流运动的模型观测及数值模型初》.pptVIP

《航运枢纽冲沙过程非恒定流运动的模型观测及数值模型初》.ppt

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Experimental Studies on Sediment Flushing in the Upstream Approaching Channel of TGP Wang Ruiyu Main Contents Introduction Model Experiment Analysis of the Result Conclusion This study focus on three points: 1. How high is the maximum flushing discharge under the conditions that the difference of the water levels on the two sides of the protecting dike does not exceed 2m. Main Contents Introduction Model Experiment Analysis of the Result Conclusion Water level, water velocity and deposition volume are to be measured during the experiment. Because the process is unsteady, the water level varies much with the time. An automatic measuring device was applied to precisely trace the change of water level. 7 sensors measure the water pressure, and then convert the pressure into water level. The framework of the automatic measuring device Main Contents Introduction Model Experiment Analysis of the Result Conclusion Analysis of the Result of the Experiment 1.Flushing Discharge We have mentioned above that the maximum flushing discharge under the precondition that the difference of the water levels on the two sides of the protecting dike does not exceed 2 meters has to be studied. The water level of the Three Gorges Reservoir during the flood season is 145 meter. This relative low water depth could increase the flushing velocity and thus improve the flushing efficiency. Therefore we will first study the condition of 145m reservoir water level, and the sediment deposition reaches 139m-140m. Analysis of the Result of the Experiment 2. Flushing efficiency Analysis of the Result of the Experiment 3. Fluctuation in the upstream approaching channel To safeguard the navigation, the water flow condition in the upstream approaching channel should satisfy the following requirements: the longitudinal flow velocity2m/s, transverse flow velocity0.5m/s, wave height0.5m, converse flow velocity0.4m/s.Otherwise the safety of the n

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