Small watershed region-oriented landslide hazard risk division method based on mechanism analysis

Abstract

The invention discloses a small watershed region-oriented landslide hazard risk division method based on mechanism analysis. The small watershed region-oriented landslide hazard risk division method based on the mechanism analysis comprises the following steps of: I. establishing slope units of small watershed region-oriented landslide hazard risk division; II. calculating a risk evaluation index of each slope unit, performing normalization processing on the risk evaluation indexes, and establishing a geographic information database based on the slope units; III. calculating a value of the integrated risk degree Z of each slope unit to obtain a small watershed region-oriented landslide hazard integrated risk division result. According to the small watershed region-oriented landslide hazard risk division method disclosed by the invention, on one hand, an index system and a space unit are started from a hazard formation mechanism, and therefore, the division result is more objective and scientific, and on the other hand, suitable spatial precision is provided for hazard prevention, so that the risk division result is more directive.

Description

technical field [0001] The invention relates to landslide disaster risk assessment technology, in particular to a method for landslide disaster risk zoning in small watershed areas based on slope units. Background technique [0002] A landslide is a process in which the slope rock and soil mass is deformed, destroyed and unstable under the action of triggering factors such as rainfall and human activities, and is affected by internal factors such as slope topography and geology. Among the geological disasters that have occurred, landslide disasters belong to the most serious category of sudden geological disasters. The number of such geological disasters in the world is large, the damage is great, and the loss is heavy, which has aroused people's extreme concern. big concern. Landslide risk zoning has gradually become a research hotspot in the field of disaster prevention and control in recent years. Disaster risk refers to the degree of disaster that may be reached in a n...

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Problems solved by technology

In terms of spatial scale, there are currently two commonly used risk zoning scales. One is the regional scale with the administrative unit as the basic unit. The scale of landslide disasters is often only a few square meters to a few hectares. The spatial accuracy of the existing risk zoning It cannot meet the needs of disaster prevention and mitigation; the other is the zoning method based on the geographic grid as the basic unit. This traditional GIS-based unit grid calculation method evaluates the landslide risk at the small watershed scale, because it reflects the basis of the evaluation index. The mismatch between the data accuracy and the evaluation method, no matter how fine the cell grid is divided, the evaluation results are still difficult to meet the accuracy requirements

In short, the current risk analysis results are difficult to apply to practical applications for the grassroots frontline disaster prevention and mitigation managers in rural areas

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