Small watershed debris flow disaster prevention method and system

Abstract

The invention belongs to the technical field of natural disaster prevention, and discloses a small watershed debris flow disaster prevention method and system. (1) Barrier dam and check dam projects are distributed in a Ngawang creek debris flow forming area and a N1 debris flow ditch and a N2 debris flow ditch of Huangjiawan debris flow; (2) a training wall project is distributed on a big white river bed to the east of a Ngawang town; (3) a drainage groove project is distributed in a Ngawang creek debris flow ditch accumulating area; (4) a scour preventing wall project is distributed in an intersection between a Ngawang creek debris flow ditch and a south side gully of the Shimen village committee; and (5) trees, shrubs and herbaceous plants, growing in the area, are planted in the Ngawang creek debris flow ditch forming area. Main power mechanical parameters of the debris flow are calculated, and the activity is estimated to provide the debris flow prevention project proposals; and prevention project schemes are recommended.

Description

technical field [0001] The invention belongs to the technical field of natural disaster prevention and control, and in particular relates to a method and system for preventing and controlling debris flow disasters in small watersheds. Background technique [0002] Considering that after the retaining dam is put into normal use, the main loads of the force combination mode under different storage capacities (empty storage, half storage capacity and full storage) are: debris flow fluid impact force, earth pressure generated by debris flow accumulation behind the dam, static water pressure, dam bottom uplift pressure and seismic force. The design and calculation working conditions are divided into the following categories: working condition I: dam body weight + earth pressure + hydrostatic pressure + uplift pressure (full storage capacity state); working condition II: dam body weight + earth pressure + debris flow fluid impact force + hydrostatic pressure + uplift pressure (ha...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the geological environment of the traditional small watershed river basin is fragile, and the topography is steep, which eventually leads to landslides and avalanches and intense soil erosion; at the same time, the forest vegetation in the upper reaches of the river is destroyed, steep slope reclamation and Leakage of the canal reduces the shear strength, leading to landslides and collapses, and a large amount of sediment and stones collapse into the river, causing the downstream farmland on both banks to face sediment disasters

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