Debris flow starting test artificial rainfall simulating method

Abstract

The invention discloses a debris flow starting test artificial rainfall simulating method. The adopted debris flow starting test artificial rainfall simulating system comprises an artificial rainfalldevice, a rainfall monitoring device and a control device, wherein the artificial rainfall device comprises a water tank, a water pump, a rainfall bracket and a rainfall spray head; the rainfall sprayhead is arranged on the rainfall bracket and is connected with a water tank through a water pipeline; the water tank is connected with a water pump; the rainfall monitoring device records actual rainfall capacity, soil moisture content, soil displacement of soil and the tension amount of a tension sensor, and sends the detected data to the control device; the control device judges whether a debris flow happens according to the collected data, and records the slope runoff, slope internal runoff, soil body creep deformation and the debris flow forming time when the debris flow happens. The method disclosed by the invention is simple in structure and convenient to operate, and can be used for detecting the debris flow happening process by simulating different rainfall types; the detection result is quick and accurate, and a basis is provided for predicting and forecasting debris flow.

Description

technical field [0001] The invention relates to the technical field of debris flow start-up tests, in particular to an artificial rainfall simulation method for debris flow start-up 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 projects. [00...

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

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