Numerical Simulation of the Wind Effect on the Transport of Brown Sole Eggs and Larvae in and Around the Sado Strait

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  • 佐渡海峡周辺におけるマガレイ卵・仔魚の輸送に対する風の影響の数値シミュレーション

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Abstract

Pelagic eggs and larvae of brown sole (Pleuronectes herzensteini) are transported from the spawning grounds near the Sado Strait in Japan Sea to the nurseries in the downstream of coastal currents. The success or failure of the transport could determine the year-class strength of the brown sole population in and around the Sado Strait. Since strong north-northwest winds prevail during the main spawmng period, wind-induced currents would contribute to offshore/inshore drift of the eggs and larvae. In order to expIore the wind effects on the transport process, numerical simulation was made usmg a three dimensional current model with a horizontal grid size of 2.5km and vertical resolution of 3 layers (upper : 0-20m, middle : 20-60m, lower : 60-bottom). It should be noted that, by adding the strong wind drift induced by northwest, west and north winds to the basic flow pattem in and around the Sado Strait, the percentage of eggs and larvae retained in shelf areas shallower than l00 m appreciably reduced, compared to that for the case of no wind. However, corresponding to the reduction by half in the inflow velocities below the middle layer at the open boundary of the model, the percentage of eggs and larvae retained rapidly increased under the west wind, while it further decreased under the north wind. This suggests that, in addition to the wind conditions, the inflow into the Sado Strait could affect the retention of brown sole eggs and larvae in the coastal nurseries.

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