Rip current forecasting method

A prediction method and background flow technology, applied in the field of offshore current prediction, can solve problems such as limited and difficult-to-predict measurement areas for offshore currents

Active Publication Date: 2016-03-09
OCEAN UNIV OF CHINA
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Problems solved by technology

[0004] In order to solve the problem that the existing offshore current is difficult to predict or the measurement area is limited by the way

Method used

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Embodiment 1

[0021] Embodiment 1, this embodiment proposes a rip current prediction method, including the following steps:

[0022] S1. Obtain high-precision wind and pressure fields in the target sea area and its surrounding sea areas, and extract real-time high-precision wind and pressure fields based on the existing mesoscale marine weather operational forecasting system; figure 1 Shown is a schematic diagram of the wind field and pressure field at a certain moment of the WRF forecast for the entire Northwest Pacific region, where the wind field is represented by arrows and the pressure field is represented by contour lines.

[0023] Based on the existing atmospheric model WRF (Weather Research and Forecasting Model) mesoscale weather operational forecasting system, real-time forecasted wind field and pressure field data are extracted. At present, many universities and scientific research institutes at home and abroad with marine and atmospheric research directions have operational fore...

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Abstract

The present invention discloses a rip current forecasting method. The method comprises the following steps of: (1) based on a mesoscale marine weather operational forecasting system, acquiring wind fields and pressure fields of a target sea area and surrounding sea areas of the target sea area; (2) establishing a Delft3D hydrodynamic numerical model, and simulating to obtain tidal current fields of the target sea area and the surrounding sea areas of the target sea area; (3) establishing an SWAN wave spectral model, and simulating to obtain wave fields of the target sea area and the surrounding sea areas of the target sea area; (4) extracting boundary conditions from the wave fields, using the tidal current fields as background current fields, establishing an SWASH wave analysis model, and simulating to obtain a time sequence of a water particle velocity of the target sea area; and (5) accounting intensity of a rip current. In order to consider the dynamic characteristics of coupling of multiple physical mechanisms and coexistence of multiple spatial and temporal scales of the rip current, the method comprehensively utilizes various models to respectively stimulate different physical processes, considers the interactions between various models by using data exchange and coupling, and achieves real-time forecasting of the rip current of a bathing beach so as to provide references for beach rescue.

Description

technical field [0001] The invention relates to an ocean forecasting technique, in particular to a method for forecasting offshore currents. Background technique [0002] A rip current is a jet that originates in the wave breaking zone and points offshore. Rip currents can occur in many sandy waters and in different wave and tidal environments. They have the characteristics of narrow streams and rapid currents, and can quickly draw swimmers into deep water areas in the open sea without any precautions. In the United States, statistics show that the number of drowning deaths caused by rip currents is about 100-150 per year, and more than 80% of beach rescue missions are related to rip currents. In Australia, rip currents kill more people annually than storms, floods, bushfires, and shark attacks combined. In China, the bathing beaches in coastal tourist cities such as Qingdao, Xiamen, and Sanya are also places where rip currents frequently occur. On the morning of August 4...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 武国相梁丙臣李华军徐照妍陈玉洁
Owner OCEAN UNIV OF CHINA
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