Torrential flood flow calculating method based on virtual reservoir breaking process

A flow calculation and reservoir technology, applied in hydraulic engineering, hydraulic engineering equipment, hydraulic models, etc., can solve problems such as low reliability

Inactive Publication Date: 2019-11-22
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods often ignore the mutual coupling relationship among hydrodynamics, soil mechanics, and sediment dynamics during flash floods, especially the contribution of water storage in depressions and soil water content to flash flood flow. The calculation method has low reliability

Method used

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  • Torrential flood flow calculating method based on virtual reservoir breaking process
  • Torrential flood flow calculating method based on virtual reservoir breaking process
  • Torrential flood flow calculating method based on virtual reservoir breaking process

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Embodiment 1

[0057] Embodiment 1: the method comprises the following steps:

[0058] Step 1: Obtain the basic data of the research area through field observations and experiments, where the basic data specifically include: geographical location, topography, and soil type data of the research area.

[0059] Step 2: Collect the rainfall duration curve in the study area, corresponding to each discrete moment of each topographic point, there is a corresponding rainfall intensity.

[0060] Step 3: Collect the physical and mechanical parameters of the soil in the study area, including the initial water content θ 0 , soil saturated water content θ s , soil median particle size D 50 , Porosity n.

[0061] Step 4: For each hydrogeomorphic unit on the slope, if the hydrogeomorphic unit is full and the flow velocity on the slope exceeds the critical starting velocity of the soil, the water flow will start to carry sand and gradually generate debris flow or landslide. which is:

[0062] v 泄 ≥v ...

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Abstract

The invention discloses a torrential flood flow calculating method based on the virtual reservoir breaking process. Based on the intercoupling relationship among hydrodynamics, soil mechanics and sediment dynamics and through combination with contributions, neglected in calculation in the past, of the depression water storage mount, the soil water content and the like to the flow, the method comprises the steps that each hydrogeomorphic unit of the slope surface is assumed as a virtual reservoir, the torrential flood flow is divided into the slope surface runoff and the virtual reservoir breaking effusive flow, a comprehensive solving algorithm of the slope surface hydrologic process and the sediment erosion process is established, the state change of runoff generation and confluence of the slope surface before and after the critical state is controlled by taking the critical starting velocity as the control condition, the slope surface erosion process of torrential flood is calculatedthrough a hyperbolic scouring formula, the effusive flow is calculated accordingly, and then the effusive flow is superimposed with the slope surface runoff volume of the hydrogeomorphic units of theslope surface to obtain the total flow of the torrential flood. The calculating method has the definite physical mechanism, the scientificity of researching of the torrential flood physical process and the accuracy of flow calculating are improved, and technical support is provided for torrential flood disaster analysis and early warning work.

Description

technical field [0001] The invention relates to the technical field of mountain torrent disaster analysis and evaluation, in particular to a method for analyzing and calculating mountain torrent flow that induces landslides and mud-rock flows. Background technique [0002] In recent years, due to global climate change and frequent occurrence of extreme hydrological events, the frequency and intensity of mountain torrent disasters worldwide have become increasingly prominent. A large amount of sand, stones, etc. are entrained to form mudslides and landslides, which pose a serious threat to the national economy and the safety of people's lives and property. [0003] At present, the analysis and calculation of mountain torrent disasters are either based on the critical rainfall method, using historical statistical data to analyze the critical rainfall conditions of mountain torrents; or based on the dynamic critical rainfall method, using hydrological models and classical hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B1/00E02B1/02
CPCE02B1/00E02B1/02
Inventor 李相南严登华翁白莎严登明刘思妤毕吴瑕于志磊李蒙
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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