CN-122021872-A - Method, system, storage medium and equipment for determining occurrence time and frequency of debris flow in unmanned area based on lichen size

CN122021872ACN 122021872 ACN122021872 ACN 122021872ACN-122021872-A

Abstract

The invention discloses a method, a system, a storage medium and equipment for determining the occurrence time and frequency of debris flow in an unmanned area based on the size of lichen, and relates to the technical field of geological disaster monitoring and yearning. The method is characterized in that the exposure time of the moss is calculated according to the average diameter of the moss and the actual growth rate of the moss and combined with the initial diameter of the moss, the occurrence time of the debris flow is determined according to the exposure time of the moss, and the occurrence frequency of the debris flow is obtained according to the occurrence time of the debris flow. The invention effectively solves the technical problem that the age and frequency of the debris flow event in the unmanned area are difficult to determine.

Inventors

CHEN NINGSHENG
JIN JIMING
SHE DEBIN
TIAN SHUFENG
Peng taixin
HUANG NA

Assignees

长江大学

Dates

Publication Date: 20260512
Application Date: 20251222

Claims (8)

1. The method for determining the occurrence time and frequency of the debris flow in the unmanned area based on the size of the lichen is characterized by comprising the following steps of: S1 condition setting Setting up the growth stage of the moss as linear growth and neglecting the influence of the time difference between the initial growth of the moss and the exposure of the roller stones to the ground surface. S2, lichen data acquisition Selecting moss species suitable for measuring years, selecting a plurality of prismatic rolling stones in a debris flow channel, measuring the longest axis diameter of the maximum moss in the selected species on each rolling stone, and calculating to obtain the average diameter of the moss; S3, lichen growth rate fitting Acquiring historical reference sizes of the moss according to the debris flow events with known exact occurrence time in the adjacent area, and fitting the average diameter and the growth time of the moss according to the historical reference sizes to obtain the actual growth rate of the moss in the unmanned research area; S4, time and frequency determination The exposure time of the moss is calculated based on the average diameter of the moss and the actual growth rate of the moss, and the exposure time of the moss is calculated based on the initial diameter of the moss, the occurrence time of the debris flow is determined based on the exposure time of the moss, and the occurrence frequency of the debris flow is obtained based on the occurrence time of the debris flow.
2. The method for determining the occurrence time and frequency of debris flow in an unmanned area based on the size of moss of claim 1, wherein in step S2, the selection of moss species suitable for measuring years is selected to be easily identified, measured, the growth rate is moderate, and the species of moss is single, the easily identified moss particularly comprises yellow green map clothing, lishi yellow clothing, tea stain clothing or plum clothing, the easily measured moss is moss with a shape similar to a circular ring, and the species of moss is not adhered with other moss.
3. The method for determining the occurrence time and frequency of the debris flow in the unmanned area based on the size of lichen as set forth in claim 1, wherein the number of the barren rocks is 10-50 in the step S2.
4. The method for determining the occurrence time and frequency of the debris flow in the unmanned area based on the size of the moss as set forth in claim 1, wherein in the step S2, the average diameter of the moss is calculated by removing the maximum value and the small value of the measured data and calculating the average value based on the remaining value.
5. The method for determining the occurrence time and frequency of the debris flow in the unmanned area based on the size of the moss according to claim 1, wherein in the step S4, the exposure time of the moss is calculated by the following formula: T=(D-b)÷a Where T is the exposure time of the moss in years, D is the average diameter of the moss in mm, b is the initial diameter of the moss in mm, a is the actual growth rate of the moss in mm/year.
6. A system for determining the time and frequency of occurrence of debris flow in an unmanned area based on the size of a lichen, comprising: The condition setting module is used for setting that after the debris flow event occurs in the unmanned research area, the surface of the roller stones in the debris flow channel starts to grow the lichen, and the diameter of the lichen and the exposure time are in positive correlation; the data acquisition module is used for selecting moss species suitable for measuring years, selecting a plurality of prismatic rolling stones in a debris flow channel, measuring the longest axis diameter of the maximum moss in the selected species on each rolling stone, and calculating to obtain the average diameter of the moss; the fitting module is used for obtaining the historical reference size of the lichen according to the debris flow event with known exact occurrence time in the adjacent area, and fitting the average diameter and the growth time of the lichen according to the historical reference size to obtain the actual growth rate of the lichen in the unmanned research area; A determining module for calculating an exposure time of the moss based on the average diameter of the moss and the actual growth rate of the moss in combination with the initial diameter of the moss, determining a time of occurrence of the debris flow based on the exposure time of the moss, and deriving a frequency of occurrence of the debris flow based on the time of occurrence of the debris flow.
7. A storage medium having a program or instructions stored thereon, wherein the program or instructions, when executed by a processor, perform the steps of the above method.
8. An electronic device comprising a processor and a memory, characterized in that the memory stores a program or instructions executable on the processor, which when executed by the processor, implement the steps of the above method.

Description

Method, system, storage medium and equipment for determining occurrence time and frequency of debris flow in unmanned area based on lichen size Technical Field The invention relates to the technical field of geological disaster monitoring and yearning, in particular to a method, a system, a storage medium and equipment for determining occurrence time and frequency of debris flow in an unmanned area based on the size of lichen. Background The debris flow is used as a common natural disaster, is frequently generated in mountain and valley areas, has the characteristics of strong burst and high destructive power, and causes a large amount of casualties and property loss each year. With the development of western highland, mountain area and other unmanned areas in China, many major projects (such as roads and transmission lines) need to pass through the areas. If the occurrence frequency of the debris flow in a certain area is high, the situation shows that the geological disaster risk of the area is large, and targeted prevention and control measures are needed. However, in an unmanned area, due to the lack of long-term monitoring equipment and history records, the occurrence time and frequency of the debris flow are difficult to accurately determine, so that the occurrence frequency and the scale of the debris flow cannot be estimated, and potential safety hazards are brought to engineering construction. Currently, the main methods for determining the occurrence time of the debris flow include historical disaster statistics, remote sensing monitoring and on-site geological investigation. However, the methods have obvious limitations in unmanned areas, such as low applicability of data loss, high remote sensing monitoring cost, limited resolution, difficulty in acquiring long-term data, and limited landform danger and poor accessibility in field investigation. In addition, in the prior art, a method for reversely pushing debris flow time based on biomarkers is rarely available, so that the application effect of a data starvation area is not ideal. The lichen yearn technique is used as a biological geology yearn method for determining the age of geological events such as glacier sediment, earthquake events and the like. Lichen is an algal symbiont whose growth rate is related to environmental conditions and whose diameter increases with exposure time. However, traditional lichen has been focused on glacier or seismic events for many years, has fewer applications for debris flow events, and lacks a systematic approach. Especially in the unmanned area, the growth record of the lichen in the debris flow channel is not fully utilized, and the accurate back-pushing of the occurrence time of the debris flow cannot be realized. Therefore, a new technology for determining the occurrence time and frequency of the debris flow based on the size of the lichen is needed to solve the problem of determining the occurrence time of the debris flow under the condition of lack of data in unmanned areas. Disclosure of Invention Aiming at the defects and the shortcomings of the prior art, the invention provides a method, a system, a storage medium and equipment for determining the occurrence time and the occurrence frequency of debris flow in an unmanned area based on the size of the moss, which are suitable for debris flow ditches which are suitable for the growth of the moss and are influenced by unmanned activities, and aims to determine the occurrence time and the occurrence frequency of the debris flow by measuring the size of the moss in the debris flow ditches, combining the growth rate of the moss and reversely pushing the exposure time of the moss, thereby solving the technical problem that the occurrence time and the occurrence frequency of the debris flow in the unmanned area are difficult to determine. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the invention provides a method for determining the occurrence time and frequency of debris flow in an unmanned area based on the size of lichen, which comprises the following steps: S1 condition setting Setting up the growth stage of the moss as linear growth and neglecting the influence of the time difference between the initial growth of the moss and the exposure of the roller stones to the ground surface. S2, lichen data acquisition Selecting moss species suitable for measuring years, selecting a plurality of prismatic rolling stones in a debris flow channel, measuring the longest axis diameter of the maximum moss in the selected species on each rolling stone, and calculating to obtain the average diameter of the moss; S3, lichen growth rate fitting Acquiring historical reference sizes of the moss according to the debris flow events with known exact occurrence time in the adjacent area, and fitting the average diameter and the growth time of the moss according to the historical reference sizes to obtain the actual growt