Artificial rainfall simulation device for debris flow test

Abstract

The invention discloses an artificial rainfall simulating device for a debris flow test, wherein the device can be used for simulating different rainfall types and establishing debris flow starting models under different rainfall types, so as to provide a basis for predicting and forecasting debris flow. The rainfall is simulated by an artificial rainfall device, and the soil layer change under different rainfall amounts is monitored by a rainfall monitoring device; a control device records the slope runoff, slope internal runoff, soil body creep deformation and the debris flow forming time when the debris flow happens, and can establish a debris flow starting model under different rainfall types. In the device disclosed by the invention, a pressure control valve can perfectly filter solidparticles, phytoplankton and the like in river water, thereby being energy-saving and environment-friendly and prolonging the service life of a spray head.

Description

technical field [0001] The invention relates to the technical field of debris flow start-up tests, in particular to an artificial rainfall simulation device and a simulation method for debris flow tests. Background technique [0002] Debris flow is a solid-liquid two-phase fluid filled with a large amount of sand, stones and boulders. It has the characteristics of sudden outbreak, strong transport impact and silting ability, and great destructive power. The nature of debris flow determines its formation needs Plenty of water. The water source that causes debris flow in my country mainly comes from heavy rain, which shows that when the rainfall reaches a certain critical rainfall value, disasters will form. Therefore, the determination of critical rainfall is of great significance for studying the formation mechanism of debris flow, analyzing and predicting the characteristics of future activities of debris flow, and guiding the design of debris flow prevention and control p...

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing debris flow forecasting models are based on statistical data. Debris flows mostly occur in remote mountainous areas where monitoring data is scarce. The universality of many existing models cannot meet the needs of disaster prevention and mitigation. Debris flow start In-situ test or model test, and then determine the rainfall threshold for debris flow initiation in each region according to the underlying surface conditions. Combined with the test phenomenon, it can analyze the characteristics of debris flow initiation, debris flow scale and accumulation characteristics, analyze the disaster-causing ability of debris flow, and evaluate the potential scope of influence. And establish a debris flow start-up model to provide a basis for future debris flow prediction

The existing artificial rainfall device for debris flow start-up has a relatively simple structure and cannot simulate the impact of regional point rainstorms on the start-up of debris flow, and the rainfall conditions cannot be adjusted. The simulated rainfall and actual rainfall conditions are significantly different, resulting in the distortion of the obtained data. Accuracy cannot meet the needs of disaster prevention and mitigation

[0005] When simulating rainfall in remote areas such as mountainous areas, the water source used is mostly the water in the local river, but the water in the river contains a lot of solid particles and phytoplankton, etc., which are directly used to simulate rainfall, which may easily cause blockage of the sprinkler

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