Determination risk of natural disaster based on moisture content information

1. A disaster prediction method comprising:

acquiring moisture content information in soil at a specified site;

acquiring moisture content information at a ground surface within a given range that includes the specified site;

determining and highlighting a point where there is a risk of natural disaster within the given range based on the moisture content information in soil at the specified site and the moisture content information at the ground surface within the given range;

calculating a storage volume of water on the ground surface or in a ground at a freely-selected site in the given range based on the moisture content information in soil and the moisture content information at the ground;

calculating a degree of risk of a landslide disaster at the freely-selected site in the given range based on the storage volume of water on the ground surface or in the ground at the freely-selected site in the given range, a slope stability analysis formula, and the relationship between other variables required for the slope stability analysis formula, the landslide disaster being included in the natural disaster; and

determining and highlighting a point where there is a risk of the landslide disaster within the given range based on the degree of risk of the landslide disaster at the freely-selected site in the given range.

2. The disaster prediction method according to claim 1 , further comprising:

estimating a parameter indicating a property of soil at the freely-selected site in the given range based on the moisture content information in soil at the specified site and the moisture content information at the ground surface within the given range, and

estimates the storage volume of water on the ground surface or in the ground at the freely-selected site in the given range, based on the parameter that is estimated and an amount of rainfall at the freely-selected site.

3. The disaster prediction method according to claim 1 , further comprising:

estimating the moisture content information in soil in each mesh element in a first area including the specified site, based on an amount of rainfall for each mesh element; and

correcting a parameter used when estimating the moisture content information in soil in each mesh element, in such a way that an estimation result of the moisture content information in soil in each mesh element in the first area comes close to the acquired moisture content information in soil at the specified site, the first area being set corresponding to at least a plurality of soil types;

estimating the storage volume of water on the ground surface or in the ground at the freely-selected site in the given range, by selecting a corrected parameter corresponding to one soil type based on the moisture content information in soil in each mesh element that is based on the amount of rainfall and is calculated using the corrected parameters corresponding to a plurality of soil types and the moisture content information at the ground surface in the given range.

4. The disaster prediction method according to claim 1 , further comprising:

correcting a parameter used for measuring the moisture content information at the ground surface, in such a way as to come the acquired moisture content information at the ground surface in the given range including the specified site close to the acquired moisture content information in soil at the specified site, and

estimating the storage volume of water on the ground surface or in the ground at the freely-selected site in the given range, based on the moisture content information at the ground surface in the given range measured using the corrected parameter.

5. A disaster prediction system comprising:

at least one processing component configured to:

acquire moisture content information in soil at a specified site;

acquire moisture content information at a ground surface within a given range that includes the specified site;

determine and highlight a point where there is a risk of natural disaster within the given range, based on the moisture content information in soil at the specified site and the moisture content information at the ground surface within the given range;

calculate a storage volume of water on the ground surface or in a ground at a freely-selected site in the given range based on the moisture content information in soil and the moisture content information at the ground;

calculate a degree of risk of a landslide disaster at the freely-selected site in the given range based on the storage volume of water on the ground surface or in the ground at the freely-selected site in the given range, a slope stability analysis formula, and the relationship between other variables required for the slope stability analysis formula, the landslide disaster being included in the natural disaster; and

determine and highlight a point where there is a risk of the landslide disaster within the given range based on the degree of risk of the landslide disaster at the freely-selected site in the given range.

6. A non-transitory computer-readable program recording medium storing a disaster prediction program, the disaster prediction program causing a computer to execute:

processing of acquiring moisture content information in soil at a specified site;

processing of acquiring moisture content information at a ground surface within a given range that includes the specified site;

processing of determining and highlighting a point where there is a risk of natural disaster within the given range based on the moisture content information in soil at the specified site and the moisture content information at the ground surface within the given range;

processing of calculating a storage volume of water on the ground surface or in a ground at a freely-selected site in the given range based on the moisture content information in soil and the moisture content information at the ground;

processing of calculating a degree of risk of a landslide disaster at the freely-selected site in the given range based on the storage volume of water on the ground surface or in the ground at the freely-selected site in the given range, a slope stability analysis formula, and the relationship between other variables required for the slope stability analysis formula, the landslide disaster being included in the natural disaster; and

processing of determining and highlighting a point where there is a risk of the landslide disaster within the given range based on the degree of risk of the landslide disaster at the freely-selected site in the given range.