Composite vortex recognition model construction method based on Helmholtz decomposition and deep learning

Abstract

The invention discloses a composite vortex recognition model construction method based on Helmholtz decomposition and deep learning, and the method comprises the following steps: obtaining data of a flow velocity U in the east-west direction and a flow velocity V in the south-north direction of seawater, and constructing a velocity vector field image; performing Helmholtz decomposition on the velocity vector field image to obtain an image with a potential field Fd and an image with a rotation field Fc; according to a potential function and UV data in the rotation field Fc, labeling a single-vortex air vortex, a single-vortex anti-cyclone vortex, a compound-vortex air vortex and a compound-vortex anti-cyclone vortex, and taking rotation field images before and after labeling as a deep learning data set; and training the deep learning data set by using a neural network to obtain a composite vortex recognition model. The Helmholtz decomposition method is used for processing derivative data of the satellite altimeter, the recognition accuracy of the compound vortex is improved, the deep learning method is adopted, the recognition efficiency of the compound vortex is improved, and finally application of the model to the whole sea area is achieved.

Description

technical field

[0001] The invention belongs to the field of compound vortex identification, in particular to a method for constructing a compound vortex identification model based on Helmholtz decomposition and deep learning. Background technique

[0002] A mesoscale eddy is a type of eddy in the ocean that is widespread in the global ocean. Ocean eddies themselves carry great kinetic energy, which plays a key role in global ocean material transport and energy transfer. We have often identified single vortices before, but little attention has been paid to compound vortices. The composite vortex is a combination of single vortices. After two single vortices meet together to form a composite vortex, it will affect the trajectory of the original single vortex. In addition, the form of energy exchange between two independent single vortices is also different from that of the two single vortices in the composite vortex, so our identification of the composite vortex has very im...

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