A Study on Stimulation of Tidal Exchange of a Closed Sea

封闭海潮汐交换刺激的研究

• 批准号: 11450389
• 负责人: KYOZUKA Yusaku
• 金额: $ 3.58万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450389/
• 关键词: Tidal exchange; Average residence time; Water quality purification; Closed sea; Flow control; Particle tracking method; CFD; 海水交換; 潮流

Closed sea areas in Japan were classified into several groups by the closed index, which was defined by the ratio of the sea surface area to the cross-section area of the mouth of the closed sea. A local fishing port was considered for the realistic application of the stimulation of the tidal exchange of the closed sea area. A numerical simulation program was developed with the tracking particle method for the visualization of the flow and the preliminary calculations were conducted in a rectangular port. The remnant function was obtained by the number of the remaining particles in the port. The averaged residence time was calculated from the remnant function of the port in the studies of 1999.A local fishing port in Seto inland sea was taken as an example of the closed sea area. Stimulation of the tidal exchange was examined by the introducing a opening in the breakwater which surrounds the port. The remnant function and the averaged residence time of the port were calculated for some positions of the opening in the breakwater. The particle tracking method is applied to simulate and visualize the flow inside the port using a number of imaginary particles. From those numerical results, the effects of the opening in the breakwater on the stimulation of the tidal exchange were confirmed. The determination method of an optimum position of the opening in the breakwater should be established in the future.A similar method was applied to study about tidal exchange of the Hakata bay of Fukuoka city, where Wajiro tidal flat is located at the back of the bay and is valuable as a sanctuary for wild birds. We proposed the construction of a waterway through the sandbank from the outer sea to the inside of the bay. The flow in the waterway would be driven by the tide and be controlled to generate a one way current. These effects on the tidal exchanges were studied using numerical simulations.

日本的封闭海域根据封闭指数分为若干组，封闭指数是根据海面面积与封闭海域口部横截面积之比确定的。以某渔港为例，探讨了封闭海域潮汐交换模拟的实际应用。采用粒子跟踪法编制了数值模拟程序，并对矩形通道内的流动进行了初步计算。剩余量函数由端口中剩余颗粒的数量获得。1999年的研究中，根据港口的剩余功能计算了平均停留时间，并以濑户内海的一个地方渔港为例进行了封闭海域的研究。通过在围绕港口的防波堤上引入开口，研究了潮汐交换的刺激。计算了防波堤开孔位置的剩余函数和港口平均停留时间。采用粒子跟踪方法，利用大量的虚拟粒子模拟和可视化港口内的流动。通过数值计算，证实了防波堤开孔对潮交换的影响。今后应建立防波堤开口的最佳位置的确定方法，并将类似方法应用于福冈市博多湾的潮汐交换研究，该湾的和次郎潮滩位于海湾后部，是野生鸟类的避难所。我们建议修建一条从外海到湾内的水道，穿过沙洲。水道中的水流将由潮汐驱动，并被控制以产生单向水流。利用数值模拟研究了这些影响对潮汐交换的影响。

项目成果

T.NAMB: "The Comparison between the Geostrophic Current Field and the Water Mass Distribution in the South China Sea"Engineering Sciences Reports, Kyushu University. Vol.22, No.3. 315-321 (2000)

T.NAMB：“南海地转流场与水团分布的比较”工程科学报告，九州大学。

経塚雄策: "ある漁港の海水交換の促進に関する研究"西部造船会会報. 100. 65-71 (2000)

Yusaku Kyozuka：“促进某渔港海水交换的研究”西方造船师协会通报100。65-71（2000）。

Y.Kyozuka et al: "Stimulation of Tidal Exchange of a Fishing Port"Techno-Ocean2000, Proceedings. II. 483-486 (2000)

Y.Kyozuka 等人：“渔港潮汐交换的刺激”Techno-Ocean2000，论文集。

Y.Kyozuka: "Numerical Study on Stimulation of Tidal Exchange of Hakata Bay"Proc.of the 11^<th> Int.Offshore and Polar Eng.Conf.. (in press). (2001)

Y.Kyozuka：“博多湾潮汐交换刺激的数值研究”Proc.of the 11^<th>Int.Offshore and Polar Eng.Conf..（印刷中）。

Y.Kyozuka: "On the stimulation of the tidal exchange of an enclosed coastal sea"Proc.of 9^<th> Int.Offshore and Polar Eng.Conf., ISOPE-99, Brest, France. Vol.I. 406-412 (1999)

Y.Kyozuka：“关于封闭沿海海域潮汐交换的刺激”Proc.of 9^<th> Int.Offshore and Polar Eng.Conf.，ISOPE-99，法国布雷斯特。