Landslide barrier dam breach depth measuring and calculating method and landslide barrier dam burst flood peak flow measuring and calculating method

Abstract

The invention discloses a landslide weir dam breach depth measuring and calculating method and a landslide weir dam burst flood peak flow measuring and calculating method. Aiming at the defects in theprior art, the method for judging the erodibility of the water flow of the dam body of the landslide weir dam takes the median particle size of a dam body material as an index to quickly judge the erodibility degree of the water flow of the dam body. According to the landslide dam breach depth measuring and calculating method and the landslide dam breach bottom width measuring and calculating method, the specific calculation coefficient related to the dam body erosion characteristic is introduced into the measuring and calculating method, and the influence of the water flow erodibility of thedam on breach formation and evolution can be fully considered. According to the method for measuring and calculating the burst flood peak flow of the landslide weir dam, the burst peak flow is calculated by adopting a semi-analytical formula, and the calculation result is closer to a disaster field measurement value. According to the technical scheme, the calculation principle is scientific, therequired calculation amount is small, the requirements for data acquisition and calculation hardware are low, and the requirements for disaster prevention and reduction measures for quick response inlandslide dam formation and burst events can be fully met.

Description

technical field [0001] The invention relates to a method for measuring and calculating the characteristic index of a dam burst, in particular to a method for measuring and calculating the depth of a landslide dam burst and a method for measuring and calculating the peak flow rate of a landslide dam burst flood, belonging to the technical field of geological disaster monitoring and prevention, Technical field of emergency response to geological disasters. Background technique [0002] Under the action of disasters such as collapses, landslides, and debris flows, river valleys and mountains laterally block valleys, river valleys, or riverbeds to form barrier dams, resulting in the formation of barrier lakes due to backwaters in the upstream section. Barrier lakes are widely distributed around the world. Statistics show that the time from formation to failure of barrier dams is usually short, as short as 1 day and as long as 1 week. Therefore, since the formation of the barri...

AI Technical Summary

Problems solved by technology

This method has a large computational workload and high requirements for hardware equipment, and it is difficult to apply it in time at disaster sites other than specific disaster monitoring experimental sites.

In addition to this technology, the existing methods for calculating the peak discharge of dam burst floods are mostly based on historical landslide dam burst flood data. One or two of the four parameters of the burst water volume, most of which do not consider the impact of the dam body's erodibility on the peak discharge of the burst flood

In addition, most of the existing formulas for calculating the peak flow of landslide dam failure floods have the problem of dimension inconsistency

Images