Barrier dam formation evaluation method based on water flow erosion capability

Abstract

The invention discloses a barrier dam formation evaluation method based on the water flow erosion capability. According to the barrier dam formation evaluation method, an area, a slope, a height, a slope surface length, a slope surface width, a riverway width, and a riverway slope of a potential landslide position are determined based on remote sensing and terrain data; a soil mass stacking rate of a potential landslide and a riverway water flow erosion rate are calculated respectively; and then whether the potential landslide soil mass will block a main riverway to form a barrier dam is determined based on a dimensionless rate index. Compared with the prior art, the method considers the landslide soil mass parameter and water flow parameter comprehensively and provides a dimensionless rate index, so that whether the potential landslide soil mass will block a main riverway to form a barrier dam is evaluated reasonably and thus effective prediction of the barrier dam formation possibility is realized. Moreover, the computing parameter is easy to obtain and the evaluation method is simple; and a scientific basis is provided for evaluation of the possibility of formation of a barrierdam by the potential landslide soil mass.

Description

technical field [0001] The invention relates to a method for assessing the formation of a barrier dam based on water erosion ability, in particular to an assessment method suitable for potential landslides or barrier dams formed by landslides. Background technique [0002] Barrier dams are formed by volcanic lava flows, moraines, or landslides and landslides caused by geological disasters and seismic activities that cause mountain rocks to collapse and block mainstream rivers, forming a water retaining body similar to a dam. Among them, the barrier dam formed by the landslide is controlled by the basic characteristics of the landslide and the hydrological conditions of the river. For valleys with steep slopes and small channel widths, after a landslide occurs, the movement of the soil is sufficient to move to the channel or reach the opposite bank. When the river flow cannot immediately wash the landslide soil accumulated in the channel downstream, And when the water flow d...

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Problems solved by technology

[0003] Whether the landslide soil enters the river channel to form a barrier dam can be mainly divided into three situations: 1. The landslide soil enters the river channel, and the soil body is carried downstream by the river flow, and the soil cannot be accumulated in the river channel; 2. The landslide soil mass Entering the river, part of the soil is carried downstream by the river flow, and part of the soil is accumulated in the river, gradually forming a dam. However, it is continuously washed by the river flow. The water flow is carried downstream; 3. The landslide soil enters the river, and the river flow cannot immediately wash the landslide soil accumulated in the river to the downstream, and the landslide soil gradually forms a dam

It can be known from the situation that the landslide soil enters the river channel to form a barrier dam. If the water flow cannot immediately carry the landslide soil to the downstream, the landslide soil will not be affected by the water flow, and can be smoothly accumulated in the river channel and form a barrier dam. Therefore The erosive ability of water flow to soil is the key factor affecting whether the landslide soil will form a barrier dam after entering the river, but there is no quantitative relationship between the erosive ability of water flow to soil and the formation of dams. It is impossible to effectively assess whether the landslide soil will form a barrier dam

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