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Experimental analysis on impact load of flash flood against a passable structure
Sen Wang1, Hanwu Zheng1, Er Huang1
1State Key Lab of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Plos One
|August 7, 2023
Summary
This study introduces a new model for calculating flash flood impact pressure, significantly reducing errors. The findings aid in designing structures to better withstand destructive flood forces in mountainous regions.
Area of Science:
- Hydrology and Fluid Mechanics
- Civil Engineering and Structural Design
Background:
- Flash floods in mountainous regions cause substantial structural damage globally.
- The destructive force of flash floods is primarily driven by impact load.
- Accurate calculation of impact pressure is crucial for structural resilience.
Purpose of the Study:
- To compare and analyze five existing models for calculating flash flood impact pressure.
- To propose a novel model integrating hydrodynamic and hydrostatic pressures.
- To investigate the distribution of fluid impact and maximum pressure points on obstacles.
Main Methods:
- Comparative analysis of five established impact pressure calculation models.
- Experimental data validation of model performance.
- Development of a new model by combining existing hydrodynamic and hydrostatic pressure models.
Main Results:
- The new model demonstrated a significant reduction in the relative error of the empirical coefficient.
- Error reduction from 16.2% to 7.09% for Froude numbers < 2.
- Error reduction from 10.7% to 9.9% for Froude numbers > 2.
- Analysis of fluid impact distribution and maximum pressure points against obstacles.
Conclusions:
- The proposed model enhances the accuracy of flash flood impact pressure calculations.
- Findings provide valuable insights for designing flood-resistant structures in mountainous areas.
- Improved structural design can mitigate damage caused by flash flood impact loads.
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