Storm surge simulation method combining concentric circle grids and novel typhoon field mode

Abstract

The invention provides a storm surge simulation method combining concentric circle grids and a novel typhoon field mode. The storm surge simulation method is achieved through concentric circle orthogonal grids, the novel parameterized typhoon field mode and a storm surge simulation method. The concentric circle grids can give consideration to the offshore large-scale typhoon migration process andthe high-precision calculation of the small-scale typhoon storm surge, and in combination with the novel parameterized typhoon field mode, the storm surge simulation method can quickly simulate the typhoon storm surge, and the simulation precision of the storm surge flow velocity is remarkably improved. The concentric circle grid technology researched and developed by the invention has the advantages of wide coverage area, high local resolution, equal grid length and width, good orthogonality and smoothness, high near-field calculation precision, high overall calculation speed and the like; the novel typhoon field mode can accurately provide a typhoon air pressure field and a wind speed field; a storm surge model combining concentric circle grids and a novel typhoon field mode can accurately simulate storm surge flow velocity.

Description

technical field [0001] The invention belongs to the field of marine disaster prevention and mitigation, and in particular relates to a storm surge simulation method combining concentric circle grids and a new typhoon field model. Background technique [0002] my country's coastal areas are heavily affected by typhoon disasters, accounting for more than 90% of marine disasters, and Zhejiang Province is the province with the most frequent typhoon surges. Storm surges caused by strong typhoons lead to catastrophic events such as flooding of seawater dikes and collapse of seawalls, causing huge losses to the lives and property of residents in coastal cities, and severely restricting the economic and social development of coastal areas. In order to make reasonable use of marine resources and space, accurate simulation and forecasting of typhoon surges is crucial to reduce marine disaster losses and achieve sustainable development of marine economy. [0003] With the development ...

AI Technical Summary

Problems solved by technology

Since a typhoon is an ocean-scale event with a migration span of hundreds to thousands of kilometers, it is difficult to describe the migration process of a typhoon and the high-precision calculation of storm surges in small sea areas in the same set of grids with orthogonal curved grids. When the grid is refined, the calculation efficiency will be greatly reduced, and it is even difficult to forecast storm surges; while the grid refinement of the local sea area will greatly reduce the overall grid quality, affecting the accuracy of the calculation results

The triangular grid needs to be re-interpolated when calculating the hydrodynamic elements of the section, resulting in poor accuracy and difficult to meet the requirements of storm surge forecasting

The air pressure field calculated by the commonly used typhoon field model in the world is relatively accurate, but the calculation accuracy of the wind speed field is very low, and it cannot be used to accurately simulate the storm tidal velocity. Therefore, the previous storm surge simulation only focused on the storm surge water increase, and the typhoon storm tidal velocity was hardly involved.

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