Simulation of dynamic response changes in curved river flow under landslide-induced surge wave influence

This article uses a three-dimensional loose rock landslide surge model test in shallow water areas under dynamic water conditions to study the dynamic response characteristics of river flow. Based on the observation of the changes in the flow field and morphology of the river surface before and after the landslide body enters the water using a large-scale surface flow field measurement system, the changes in the river flow conditions under the influence of landslide surges are divided into four main stages: normal water flow state, landslide inflow disturbance state, wave current coupling motion state, and accumulation body ejection state. According to the acoustic Doppler velocimeter flowmeter arranged at the intersection of the initial surge waveform centerline and the mainstream flow direction, the three-dimensional velocity time-domain process near the water surface is measured and analyzed. Based on different cross sections and measuring points in the landslide area and its upstream and downstream, a non-steady flow propeller flowmeter and an ultrasonic wave/water level acquisition analyzer were arranged to measure and reveal the longitudinal and transverse flow velocity distribution and water surface line variation of the river under the influence of landslide surge.