A Landslide Rainfall Segmentation Method and Its Application

Abstract

The invention discloses a landslide rainfall separation method and application thereof, belonging to the technical field of landslide prevention and treatment engineering. The landslide rainfall separation method comprises the following steps: a, according to situations of superficial layer soil texture of a to-be-tested red bed region, determining a critical value R0=1 mm; b, arranging multiple sensors in the to-be-tested red bed region to monitor the rainfall capacity in real time; c, determining whether the rainfall capacity at the first one hour reaches or exceeds the critical value R0; if the rainfall capacity at the first one hour is smaller than the critical value R0, determining that the rainfall is not reckoned in early-stage rainfall; if the rainfall capacity at the first one hour is larger than or equal to the critical value R0, utilizing the rainfall capacity at the first one hour as an earliest early-stage rainfall value R1, utilizing a rainfall value at each later one hour as an early-stage rainfall value R2, R3, ..., Rn, and overlaying the early-stage rainfall values hour by hour, thereby obtaining an early-stage rainfall total value R. According to the landslide rainfall separation method and the application thereof, rainfall causing landslide and rainfall irrelative to the landslide can be effectively separated, landslide-causing early-stage rainfall capacity can be accurately computed, and influence to infiltration rate of soil by the rainfall is greatly reflected, so that landslide early-warning accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of landslide prevention and control engineering, in particular to a landslide rainfall segmentation method and its application. Background technique [0002] The red bed area is composed of red sandstone, glutenite, siltstone, sandy shale and mudstone, etc. It is a typical layered rock mass, and the rock formations are mostly gentle. Soil landslides in the red bed area are mainly shallow soil landslides. The overlying soil layer on this kind of slope is thin, the rock layer is gently inclined, and large-scale sliding often occurs under heavy rainfall conditions. [0003] To study the rainfall conditions of landslides, it is necessary to separate the rainfall related to landslides from the previous rainfall that has nothing to do with landslides. Since the research is on shallow landslides, the rainfall time affecting landslides will not be very long, generally not more than 15 days. In addition, too little...

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Problems solved by technology

The disadvantage of this method is: there is no scientific method for the coefficient of decay with time, it is determined artificially; there is no scientific basis for the length of time to determine the appropriate time, if the time is very long, such as 30 days, not only the amount of calculation is large , and the rainfall for a long time has no effect on the later induced rainfall. If the time is very short, such as 3 days, the effect of the large rainfall 3 days ago may be ignored

Its disadvantages are: it is only applicable to the Taiwan area, and the rainfall in the Taiwan area is much greater than that in the west of my country, and the rainfall intensity of 4mm / h may be too large; moreover, landslides in the Taiwan area are mostly caused by typhoons, and the rainfall lasts generally 2-3 days, not suitable for shallow soil landslides in red layer areas

Its defect is that it is only applicable to areas with strong earthquakes where a large number of collapses and landslides occur, and only within 3 years after the earthquake. It is not applicable to areas less affected by the earthquake and for a longer period of time after the earthquake.

[0008] The heavy rainfall landslide disaster warning method disclosed in this patent document cannot effectively separate the rainfall that triggers landslides from the rainfall that has nothing to do with landslides, nor can it accurately calculate the early rainfall that triggers landslides, so it cannot reflect well. The impact of rainfall on the infiltration rate of the soil leads to a decrease in the reference value of the obtained previous rainfall for triggering landslides, and the accuracy of landslide early warning decreases

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