Debris flow material source dynamic reserve calculation method under rainfall condition

Abstract

The present invention relates to a calculation method for a dynamic reserve scale of a debris flow material source, and specifically to a debris flow material source dynamic reserve calculation method under a rainfall condition. The method comprises the steps of: according to plenty of field investigations and a debris flow material source type, establishing a geological model of material source destruction and conversion; and by using an on-site orthotopic artificial rainfall experiment, disclosing correlations about a conversion from slope destruction of a debris flow source region to a debris flow material source scale under different rainfall conditions, so as to establish a calculation model of a debris flow material source under a rainfall excitation condition. According to the method, proposed is the calculation method of carrying out calculation to determine a total dynamic reserve of the debris flow material source and, on this basis, calculating the dynamic reserve of the debris flow material source under the different rainfall excitation conditions, so as to provide solutions to key technical problems on geological exploration and project design such as a debris flow channel dam capacity and an exhaust conduit section.

Description

technical field [0001] The invention relates to a method for calculating the dynamic reserve scale of a debris flow source, under specific rainfall conditions, and belongs to the field of mountain disasters. Background technique [0002] Debris flow is a kind of geological disaster in mountainous areas where the fluid composed of poorly sorted soil, rocks, water and a small amount of gas flows down slopes and valleys. In the engineering prevention and control of debris flow disasters, the source of debris flow in earthquake-stricken areas is estimated It is divided into the total amount of loose matter in debris flow (static storage) and the amount of loose matter that can participate in debris flow activities during a rainfall process (dynamic storage). The source, dynamic and storage volume of debris flow is the basic parameter and direct basis for the storage capacity design of the dam, the section design of the drainage channel and the comprehensive prevention and contro...

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Problems solved by technology

[0003] However, for the calculation and prediction of debris flow sources, the academic community has no experience and norms for the prediction of its destruction and recharge process and dynamic reserves, and there is a lack of sufficient scientific basis. Neither the code nor the Code for Engineering Design of Debris Flow Disaster Prevention (DZ / T0239—2004) explained the static storage and dynamic storage of post-earthquake debris flow. There is no calculation standard and method for the dynamic storage, and the material flow of the debris flow is not specified. The amount of source changes due to the influence of rainfall conditions, resulting in no method to follow for the estimation of debris flow reserves in practical applications. Therefore, the estimation of debris flow reserves is insufficient, and there is no reliable method for reference, especially after the Wenchuan earthquake. There has been no suitable method for quantitative calculation of the estimation of dynamic reserves of debris flow sources

As a result, traditional debris flow source calculation methods cannot meet the needs of engineering design and early warning and forecasting, and examples of debris flow prevention and control projects are too numerous to enumerate.

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