Method for measuring volume water content of debris flow critical soil body and debris flow pre-warning method

Abstract

The invention discloses a method for measuring the volume water content of a critical soil body during debris flow and a debris flow happening pre-warning method. In order to overcome the shortcoming that the real-time soil body condition change of a pre-warning region can not be accurately reflected because the effective early rainfall serves as an indirect index in an effective early rainfall and real-time rainfall debris flow mode, the invention provides the method for measuring the volume water content of the debris flow critical soil body and a method for pre-warning the happening of the debris flow in a forming region by taking a method for measuring the volume water content of the critical soil body during the happening of the debris flow in the forming region of a debris flow drainage basin as a core by monitoring a coupled result of the volume water content of the current real-time soil body in the forming region and real-time rainfall data in real time. The methods are reliable in theories; a water content sensor is directly used for obtaining the real soil body water content; the debris flow is pre-warned according to the real-time rainfall change; the volume water content of the critical soil body is only required to be determined at first; the index is simple; and the suitability of the methods are high.

Description

technical field [0001] The invention relates to a method for measuring critical soil volume moisture content when debris flow occurs and a method for early warning of debris flow. Background technique [0002] Debris flows caused by heavy rains are mostly caused by the slope instability of loose sources in the source area of ​​the watershed under the action of rainfall infiltration, resulting in runoff that flows into channels in large quantities. At present, the early warning methods of rainstorm and debris flow mostly use the basic theoretical model of "effective previous rainfall-rain intensity / duration", and there are also forms of rainfall combination and critical threshold. However, the effective rainfall in the early stage can only indirectly reflect the soil characteristics during the debris flow period, and there are insufficient considerations for the important role of soil volume moisture content in the process of debris flow formation. After detailed analysis, t...

AI Technical Summary

Problems solved by technology

However, the effective rainfall in the early stage can only indirectly reflect the soil characteristics during the debris flow period, and there is insufficient consideration of the important role of soil volume moisture content in the formation of debris flows.

After detailed analysis, this kind of method generally has the following deficiencies: 1. It is difficult to accurately calculate the rainfall in the previous period, and the results obtained by various calculation methods are quite different

But in fact, in the initial stage of debris flow formation, pore water pressure, water potential, and ground temperature all have obvious changes, and the time and scale of debris flow formation are closely related to short-duration rainfall intensity, so soil volume moisture content, matrix suction, In the case of indicators such as pore water pressure or ground deformation, the obtained early warning model cannot fully reflect the physical characteristics of the debris flow when it starts

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