Numerical Simulations of Tidal Currents in the Ariake Sea Coastal Waters by Considering Nori Aquafarming Grounds

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Numerical Simulations of Tidal Currents in the Ariake Sea Coastal Waters by Considering Nori Aquafarming Grounds

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Article
Kyushu Univ. Production Kyushu Univ. Production
Title(Other Language):
ノリ養殖漁場を考慮に入れた有明海湾奥浅海域における流動解析
Responsibility:
田畑, 俊範(九州大学大学院生物資源環境科学府環境農学専攻生産環境科学教育コース水環境学研究分野 | 九州大学大学院農学研究院環境農学部門生産環境科学講座水環境学研究分野)
平松, 和昭(九州大学大学院農学研究院環境農学部門生産環境科学講座水環境学研究分野)
原田, 昌佳(九州大学大学院農学研究院環境農学部門生産環境科学講座水環境学研究分野)

Tabata, Toshinori(Laboratory of Water Environment Engineering, Course of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University | Laboratory of Water Environment Engineering, Division of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University | Laboratory of Water Environment Engineering, Division of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University)
Hiramatsu, Kazuaki(Laboratory of Water Environment Engineering, Division of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University)
Harada, Masayoshi(Laboratory of Water Environment Engineering, Division of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University)

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Language:
Japanese
Publication info:
Science bulletin of the Faculty of Agriculture, Kyushu University. 65, (2), pp. 57-72, 2010-10-29. Faculty of Agriculture, Kyushu University
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Publisher
Abstract:
A numerical simulation model has been developed to evaluate the effect of nori aquafarming grounds on the tidal currents in the Ariake Sea coastal waters. The Ariake Sea, a typical semi-closed bay located in the Kyushu Island in Japan, is very rich in many marine products, including nori. Numerous nori aquafarming grounds are installed in the coastal waters of the Ariake Sea during winter. A twodimensional depth-integrated model developed by integrating the three-dimensional continuity equation and momentum equations has been used to simulate tidal currents in the Ariake Sea. Because the maximum tidal variation in the Ariake Sea is approximately 6 m, a wetting and drying scheme is incorporated in the model in order to simulate the emergence and disappearance of tidal flats. Numerical simulations have been carried out using the data pertaining to the actual water depth, observed river inflow rates, wind fields calculated by using a mass-consistent model, sea-water levels calculated at open boundaries, and the actual distribution of the aquafarming grounds and installation density of aquafarming equipment. To validate the model, the simulation results are compared with the observed data at six points in the coastal waters. The velocities and directions of the simulated tidal currents are in good agreement with those observed data. Nori layers growing in the aquafarming attach themselves to nets supported by rods at the sea surface in the Ariake Sea; sufficient tidal current velocity and nutrients supply are absolutely essential for obtaining high quality of nori products. The optimum arrangement of the aquafarming grounds and optimum installation density of the aquafarming equipments have been investigated by numerical simulations performed using the developed simulation model in various assumed scenarios. On the basis of the simulation results, the optimum aquafarming ground arrangement and installation density are decided from the viewpoint of the tidal current velocity. Read more
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