The Study Of Maximum Water Elevation Wave And Run-up Of Impact By Landslide In V-shaped River Valley

Landslide surge disaster caused by a serious secondary disaster,which will bring human property losses and safety risks.Therefore,landslide surge has been the focus of attention.In fact,the maximum climbing height same as the maximum water elevation,apart from consider the volume of landslide,Landslide water entry velocity,landslide angle and climbing angle,the river cross-section shape also has obvious change to the wave in the reservoir area.At present,some scholars have simply elaborated the wave run-up and V-Shaped river through physical experiment and numerical simulation Wave propagation is different,but the lack of V-Shaped river valley is affected by qualitative analysis,and the V-shaped river valley is common in the mountains and rivers,so to carry out the impact of V-Shaped river valley on the wave propagation and run-up has a great practical significance for early warning of geological disasters.Using the Flow-3D software,a generalization model of impact wave resulting from landslide in V-shaped river valley was established and numerical simulation experiments under many conditions was enforced.Effects of inserting velocity of landslide into water,inserting angle,climbing angle,landslide volume and friction coefficientto the maximum water elevation and the climbing height were analyzed,respectively,and the fitting formula of the maximum water elevation and climbing height was obtained by regression analysis.The main points are as follows:a,in combination with two kinds of physical model experiments In foreign countries,using FLOW-3D software,compared with the impact wave caused by the landslide in two dimensions and three dimensional free wave surface propagation,the results is very good.b,through the GMO(fluid-solid coupling)collision model,it is shown that the height of the maximum impact wave height in the V-Shaped is larger than the broad river valley by discussing the height of the V-Shaped channel and the semi infinite spacious channel.c,Combined with the main factors that influence the landslide surge at domestic and abroad,to carry out the working condition of 96 groups of landslide caused by maximum wave height were analyzed,and the inserting velocity of landslide into water,landslide volume,friction coefficient of maximum relative wave height changes significantly,but inserting angle or climbing angle has a little effect,which between each factor has a significant influence and the landslide underwater movement time.and estimated value by the new formula,compared with other empirical formulae,can be closer measured value.d,the maximum climbing height of the landslide is analyzed,the inserting velocity of landslide into water,inserting angle,climbing angle,landslide volume and friction coefficient has a big significant influence on the maximum climbing height.Through the verification,the new formula is suitable for the climbing height calculate of V-Shaped river valley.