Method and system for estimating economic losses from wind storms
The present invention relates to systems and methods for estimating economic losses from wind storms. Accordingly, provided herein are methods estimating roughness length of an area surrounding a structure, methods calculating local wind speed at a structure, methods of estimating wind pressure on a structure, and methods of calculating the insurability of a structure. Also provided are systems and computer-readable storage media configured for performing the disclosed methods.
1. A system for estimating roughness length of an area surrounding a structure comprising:
a data storage device having imaging data of the structure and its surrounding area and program instructions; and
a processor coupled to the data storage device, the processor being operable to execute the program instructions to construct a 3D model of the structure and its surrounding area using the imaging data, and calculate a roughness length of the area surrounding the structure using the 3D model.
2. The system of claim 1 , the data storage device further comprises program instructions to perform a CFD simulation of wind flow through the 3D model to determine local wind speed, and using the Log Wind Profile equation to calculate roughness length from the determined local wind speed.
3. The system of claim 1 , wherein the roughness length is calculated with Lettau's formula.
4. The system of claim 1 , wherein the data storage device further comprises tree data, wherein the tree data includes the number and sizes of trees in the surrounding area, and additional program instructions to configure a wind-storm simulation using the calculated tree density and tree height, and calculate AAL, PML, or insurance premium for the structure using the 3D model to determine tree density and tree height of trees in the surrounding area.
5. The system of claim 1 , wherein the imaging data is selected from the group consisting of light detection and ranging (LIDAR) data, aerial photography data, satellite photography data, and any combination thereof.
6. The system of claim 1 , wherein the data storage device further comprises program instructions for estimating a plurality of additional roughness lengths of additional areas surrounding the structure, and wherein the processor calculates the roughness length using a weighted average of the additional roughness lengths.
7. The system of claim 1 , wherein the processor is also operable to calculate the insurability of the structure based on the calculated roughness length.
8. The system of claim 7 , wherein the insurability of the structure is calculated by comparing the calculated roughness length to a second roughness length of the area surrounding the structure calculated from Land Use Land Cover data.
9. The system of claim 8 , wherein if a difference between the second roughness length and the calculated roughness length falls within a threshold value chosen from the interval (−1 to 10), the structure is deemed insurable.
10. The system of claim 4 , wherein the AAL, PML, or insurance premium of the structure is determined by modifying an existing AAL, PML, or insurance premium using the calculated roughness length.
11. The system of claim 10 , wherein the existing AAL, PML, or insurance premium is modified by a function of the calculated roughness length.
12. The system of claim 2 , wherein the step of performing a CFD simulation includes simulating wind coming from a plurality of directions relative to the structure and calculating a weighted average relative wind speed at the structure.