Debris flow silt arrester overflow port overflowing flow measuring and calculating method and application thereof

Abstract

The invention discloses a debris flow silt arrester overflow port overflowing flow measuring and calculating method and application thereof. The method includes the steps: determining the volume weight of debris flow, the gradient of a ditch, the width of an overflow port, the bottom width of the overflow port, the width of the ditch at a dam site, the position coefficient of the overflow port, the slope coefficient of the overflow port and the designed mud depth by means such as field investigation measurement, field volume weight test and large-scale topographical map measurement and calculation; respectively substituting acquired parameters into a flow coefficient and overflowing flow formula to obtain overflow port overflowing flow under different conditions, and accordingly checking the overflowing capacity of the designed silt arrester overflow port. Compared with the prior art, the method integrates ditch conditions and debris flow properties into account, a flow coefficient equation and an overflow port overflowing flow equation are obtained by theoretical derivation, the flow coefficient can be uniquely determined, so that the overflowing flow can be reasonably determined, a design basis can be provided for debris flow disaster prevention engineering design, and the calculating method is simple and meets practical engineering requirements.

Description

technical field [0001] The invention relates to a method for measuring and calculating the overflow flow of an overflow port of a mud-rock flow sand retaining dam, and its application in mud-rock flow disaster prevention and control engineering. Background technique [0002] Debris flow is a common geological disaster in mountainous areas of China. It has the characteristics of sudden occurrence, short duration, ferocious onset, large erosion and silting, and strong destructive power. With the further extension of human economic activities to mountainous areas and the deterioration of the natural environment, the scope and frequency of debris flow outbreaks are increasing year by year, and the harm they bring is becoming more serious. In order to ensure the sustainable development of the mountain economy, it is very important to prevent and control debris flows necessary. [0003] In the prevention and control measures of debris flow, the sand control dam is currently the m...

AI Technical Summary

Problems solved by technology

Although the above two methods have clearly proposed the calculation formula of the overflow flow at the overflow port, and also given the range of the respective discharge coefficients, the range of the discharge coefficients is relatively wide, and the nature of the debris flow and the channel are not considered. Due to the influence of conditions, the selection of standards is somewhat arbitrary, resulting in large errors in calculations, and there are large problems in practical applications.

Images