A Numerical Study On The Temporal And Spatial Distribution Of Scallop Larvae In The Northern Part Of The Yellow Sea Based On FVCOM

The scallop(Patinopecten yessoensis)is one of the most important shellfish in northern China,whose seedling method is divided into artificial seedling and natural seeding.Natural seeding has the characteristics of strong resistance,small pollution and fast growth.Therefore,the spatiotemporal distribution of the scallops seedling was predicted,which guided natural seeding and had significant economic benefits.In recent years,Individual-Based Model(IBM)has been widely used in marine ecosystem and population dynamics.This paper combines physical oceanography and marine biology.Firstly,a three-dimensional hydrodynamic model was established under the force of tidal-wind-thermohaline in the northern Yellow Sea by applying the ocean numerical model FVCOM(Finite-Volume Coastal Ocean Model)and the calculated values and measured values of tide,tidal current and temperature-salinity are compared finding better match degree,in order to verify the hydrodynamic model accuracy.Secondly,from the point of view of ocean dynamics analysis of the tide,wind and temperature-salinity external force conditions of northern Yellow Sea in spring(April and May)the contribution of circulation,in order to analyze different forced conditions for the influence degree of the time and space distribution of the scallop’s planktonic larvae.Thirdly,the different periods-averaged and initial phases were analyzed to the influence of the Lagrange residual current,and the method had been given for describing the scallop’s passive transport speed of the Lagrange residual current,and tidal-wind-thermohaline Lagrange residual current had been given to describe Spatiotemporal distribution of the scallop’s planktonic larvae.Fourthly,according to the biological characteristics of the scallop’s larvae and the characteristics of non-autonomous swimming ability,the biological characteristics such as birth,death,growth and age were added in the Lagrange module of FVCOM and the IBM model of the scallop’s larvae was established based on individual development.Finally,a biophysical coupling model was established for the spatiotemporal distribution of the larvae of the scallop by using online coupling to solve hydrodynamic model and particle tracking model and the spatiotemporal distribution and passive transport trajectory of planktonic larvae were calculated.Based on the results of numerical simulation,the experiment of planktonic survey of the scallop was carried out,and the results of numerical simulation were found to be in good agreement with the biological survey results.The results of the comparison reveals the fact that larvae of the scallop was passively transported from the sea near ZhangZiDao island to the west coast of LaoTieShan and the spatiotemporal distribution of the larvae of the scallop at different time under the combined action of tidal-wind-thermohaline in spring(April and May),and the accuracy of the model was verified on the other hand.