A landslide disaster risk zoning method in small watershed areas based on mechanism analysis

Abstract

The invention discloses a method for landslide disaster risk zoning in small watershed areas based on mechanism analysis, comprising the following steps: step 1, establishing slope units for landslide disaster risk zoning in small watershed areas; step 2, calculating risk evaluation indicators for each slope unit , and carry out normalization process to described risk evaluation index, set up the geographical information database of slope unit; Step 3, calculate the value of the comprehensive risk degree Z of each slope unit, obtain the integrated risk zoning result of landslide disaster in this small watershed area. On the one hand, the index system and the spatial unit of the present invention start from the formation mechanism of disasters, and the zoning results are more objective and scientific; on the other hand, it provides suitable spatial precision for disaster prevention, making the risk zoning results more instructive.

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...

AI Technical Summary

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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