苏北浒苔生长期运移路径及温盐环境的数值模拟

基于已验证的有限体积海岸海洋模型(FVCOM)和拉格朗日粒子离线追踪模块，模拟了潮、风、环流、温盐、波等外界强迫不同组合下苏北海域水面粒子的5种运移路径，通过实际漂流瓶轨迹验证，并进行路径间的差异与对应单强迫流场对比研究，探讨发端于苏北的浒苔运移路径及其影响因素。结果表明:浒苔运移路径先沿着苏北沿岸向北运移至废黄河口附近海域，之后向东北方向偏转继续运移，一直到山东半岛南部海域；影响苏北浒苔运移路径的外界强迫主要是风，其次是温盐、波浪、环流，潮流可以引起浒苔在局地的旋转往复运动，不能使其向北远距离漂移。漂流期间，苏北沿岸海域表层温度为18～24℃、盐度为28～31，温盐条件在浒苔最宜生长条件范围，是浒苔能边漂移边大面积暴发的原因之一。

Numerical simulation of the migration path during the growth period of Ulva prolifera in the sea near northern Jiangsu and the thermohaline environment

A high resolution numerical model based on a proven FVCOM with a Lagrangian particle tracking module was introduced to simulate water particle movement under differences controlling conditions, including the tide, wind, boundary circulation flow, temperature, salinity, wave coupling etc. Combined with simulate results and the actual drift bottles movement paths, factors influencing Ulva prolifera were discussed. The results showed that the migration path of U. prolifera firstly migrated northward along the coast of northern Jiangsu to the sea area near the abandoned Huanghe River Estuary and then continued its migration to the sea area south of Shandong Peninsula. The external forces that affecting the migration of U. prolifera is mainly wind. It is an order of magnitude higher than anything else and followed by temperature-salinity, wave, tidal, circulation, the tidal current can cause the cyclic movement of U. prolifera in the local area, and it has no influence on Enteromorpha for drifting to the north more distant. During the simulation period, the surface temperature, salinity of drifting sea area were between 18?24℃, 28?31, respectively. These temperature and salinity conditions are close to the most suitable growth conditions of U. prolifera, indicating that U. prolifera would fast reproduce during its drifting.