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Abstract Impulsive wave events generated by landslides have the sudden and catastrophic characteristics，for which investigation information is very limited；so prototype physical experiment study is a good method in this condition. Taking impulsive wave event of Gongjiafang slump mass in Three Gorge reservoir area for the prototype，a big physical similarity model with the length of 24 m，width of 8 m，height of 1.3 m，is established，which is the first prototype model on main stream after the reservoir impounding. The model similarity ratio is 1∶200. Marble grit(d50 = 1.47 mm) is used to simulate cataclastic rockmass in the test，using 15 wave gauges，high-speed cameras and run-up instruments to monitor wave process；and six sets of impulsive wave tests with the variable of impulse velocity into water in the front of the landslide are conducted. The comparison between test results and investigation results show that the test method can be used to study or forecast impulsive wave generated by similar cataclastic rockmass failure. After analyzing a series of test data，waves interactive process is showed firstly with the help of the gauge data，for example，wave chasing，superposition and reflection wave superposition. The data also finely portrait the wave propagation and run-up decay ratio in the riverway. Through this prototype model test，the improvement direction of the experiment on impulsive wave generated by cataclastic rockmass failure is discussed. The method used in this paper can offer references for impulsive wave generated by cataclastic rockmass failure，and the results obtained can provide great technical support for forecasting impulsive wave generated by other similar slopes of Three Gorges reservoir area.
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Received: 15 October 2012
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2013, Vol. 32 
