A Method for Evaluation of Barrier Dam Formation Based on Water Erosion Capacity

Abstract

The invention discloses a method for evaluating the formation of a barrier dam based on water flow erosion ability. The evaluation method first determines the area, slope, height, slope length, width, and river width and slope of the potential landslide location through remote sensing and terrain data, then calculates the potential landslide soil accumulation rate and river water erosion rate respectively, and finally through The dimensionless rate index determines whether the potential landslide soil will block the mainstream channel and form a barrier dam. Compared with the prior art, the method of the present invention comprehensively considers landslide soil parameters and water flow parameters, and proposes a dimensionless rate index, which can reasonably evaluate whether the potential landslide soil will block the mainstream channel and form a barrier dam, and realize the formation of the barrier dam. The possibility can be effectively predicted, and the calculation parameters of the method of the invention are easy to obtain, and the evaluation method is simple and convenient, which can provide a scientific basis for the evaluation of whether the potential landslide soil forms a barrier dam.

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...

AI Technical Summary

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

Images