A comprehensive assessment method of rip current hazard index on rhythmic beach

By combining a topographic linear instability model and a nonlinear gentle slope equation, the crack flow field on a rhythmic beach is simulated. The crack flow disaster risk index is assessed by combining the float retention rate, which solves the problem that existing technologies cannot quantitatively assess crack flow disaster risk and achieves more accurate risk assessment and early warning.

CN122242332APending Publication Date: 2026-06-19DALIAN MARITIME UNIVERSITY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN MARITIME UNIVERSITY
Filing Date
2026-02-24
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies cannot quantitatively and comprehensively assess the risk of rift hazards on rhythmic beaches, especially failing to accurately describe the location and risk index of rift hazards, and failing to consider the specific consequences of rift distribution.

Method used

A linear unstable topographic model is used to generate beach topography. A simplified model is combined with a nonlinear gentle slope equation to simulate crack flow, calculate crack flow velocity distribution and risk areas, and simulate the drift trajectory of the floats by arranging numerical floats to comprehensively evaluate the crack flow disaster risk index.

Benefits of technology

It enables quantitative and refined evaluation of crack flow risk, comprehensively considers the differences in crack flow velocity, range and circulation type, provides scientific drowning risk assessment, and supports coastal tourism safety early warning and management.

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Abstract

This invention discloses a comprehensive assessment method for the risk index of crack flow hazards on rhythmic beaches, comprising: simulating the evolution of beach topography using a topographic linear instability model based on set initial equilibrium beach geomorphological characteristic parameters and incident wave parameters to generate rhythmic beach topography; performing crack flow simulation calculations using a simplified model based on nonlinear gentle slope equations based on the rhythmic beach topography and incident wave parameters to obtain the horizontal velocity field at the still water level; calculating the time-averaged Lagrange crack flow velocity distribution based on the horizontal velocity field to determine the crack flow risk area and crack flow velocity magnitude; obtaining the float drift trajectory based on numerical buoy simulation deployed in the nearshore area and calculating the float retention rate to characterize the crack flow cycle type; and quantitatively calculating the crack flow hazard risk index using a comprehensive assessment formula based on the crack flow velocity magnitude, the range of the crack flow risk area, and the float retention rate.
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