Shallow landslide solid source quantity estimation method based on underlying surfaces of small watersheds in mountainous areas and hydrodynamic conditions

Abstract

The invention provides a shallow landslide solid source quantity estimation method based on underlying surfaces of small watersheds in mountainous areas and hydrodynamic conditions, which comprises the following steps: (1) selecting a target area, and acquiring basic data of the target area; (2) on the basis of the digital elevation model of the target area, dividing the target area into slope units by adopting a hydrological analysis method, and calculating the area of each slope unit; (3) calculating the safety coefficient of the slope units, and screening out dangerous slope units; and (4)according to the area of each dangerous slope unit, calculating the shallow landslide solid matter source volume of each dangerous slope unit by adopting a landslide area and volume power law formula,and then calculating the shallow landslide solid matter source volume at different mountain torrent ditches in the target area or the total shallow landslide solid matter source volume in the targetarea. The invention can improve the accuracy of the estimation result of the shallow landslide solid source quantity of the small watershed in the mountainous area, and convenience of the method is improved.

Description

technical field [0001] The invention belongs to the field of disaster prevention and mitigation of mountain torrents, and relates to a method for estimating the amount of solid matter source of shallow landslides based on the underlying surface and hydrodynamic conditions of small watersheds in mountainous areas. Background technique [0002] The composition of the underlying surface of the small watershed in the mountain area is complex and changeable, and the slope is steep. Under the long-term geological evolution, the shallow surface rock mass is relatively broken and prone to weathering and unloading, so a large amount of loose deposits have accumulated on the slope. Affected by internal and external dynamics such as earthquakes and rainfall, shallow landslides frequently occur, which has a prominent impact on the sediment production in the basin. Wang et al. (2015) found that the Wenchuan Earthquake produced nearly 60,000 landslides. Parker et al. (2011) believed that...

AI Technical Summary

Problems solved by technology

However, limited by the data, many estimation methods are difficult to be popularized and applied. On the one hand, the commonly used remote sensing interpretation method needs to rely on the remote sensing interpretation data; Quantity of provenance, remote sensing interpretation is easy. Due to the existence of landslide groups, multiple landslides are easily identified as one landslide mass, so this method is easy to overestimate the amount of solid matter.

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