Influence of bends in mountain reservoir rivers on the propagation of impulse waves generated by landslides

Impulse wave generation from landslides in mountain reservoirs is a considerable hazard. River bends significantly affect impulse wave propagation. In this work, on the basis of the river channel characteristics of the middle and lower Lancang River Basin, we design an generalized numerical model test with bends as the main variable. The effect of bends on impulse wave propagation is analyzed in detail. The results show that the influence of the river bend angle on the propagation attenuation of the impulse wave is dominant, and as the river bend angle increases, the wave becomes more obviously blocked by the river bend. On this basis, an impulse wave propagation attenuation model of a river bend in a mountain reservoir is further constructed through the empirical formula of the China Institute of Water Resources and Hydropower Research (IWHR) and verified with the help of a 1:200 large-scale physical model test, and the two results are in good agreement. The model has strong applicability for river bend channels in mountainous reservoirs.