DEVELOPMENT OF CONTROL TECHNOLOGY OF THE ANOXIC WATER IN ARIAKE SEA.

有明海缺氧水体控制技术的发展。

• 批准号: 15580225
• 负责人: KATO Osamu
• 金额: $ 2.37万
• 依托单位: SAGA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15580225/
• 关键词: Ariake Sea; anoxic water; screw; seawater exchange system used of lower pressure; 負圧; 接近流速; 揚水管

To control the anoxic water occurring in the bottom layer of Ariake Sea, two seawater exchange systems were developed in this study. One is to utilize the lower pressure caused by the different velocity between upper layer and bottom naturally in Ariake Sea. Another is screw system.1)The pumping test utilized the lower pressure carried out with pipes of three types of diameter (φ=0.2m, 0.3m and 0.4m). In this experiment, the pumping velocity was started to observe, after the approaching velocity at the upper side of pipes reached at 2.6cm/s or more.2)The application level of the model was tested using the underdrainage pipe (φ:0.6m x 5m).At the result of the test, it was observed that the maximum rates of the approaching velocity and the pumping velocity toward bottom side were 38.2cm/s and 35.4cm/s, respectively. Thus, it was considered that the pumping velocity in the pipe was mainly influenced by the significant wave height, but not by the approaching velocity at the upper site of pipe. As the aspect obtained hi this test was new, further experiments were required to reveal the relationship between the pumping velocity and the significant wave height.3)The instrument with the screw system was newly constructed to transfer the surface flow toward bottom side.As the result of test by the instrument composed of two types of screw (φ:0.3 m at upper site and φ:0.1m at bottom site), the screw of upper site was designed to get moving with the speed of 0.5m/s, however, the actual speed was 0.3m/s. Thus, it was identified that the movement of the bottom site screw coupled with upper site one allowed the flow at bottom layer with the rate of 18m^3/s.

为了控制阿里亚克海底层发生的缺氧水，这项研究开发了两个海水交换系统。一种是利用由于阿里亚克海上自然的上层和底部之间的不同速度引起的下压力。另一个是螺钉系统。1）泵测试利用了三种直径（φ= 0.2m，0.3m和0.4m）的管道进行的较低压力。在本实验中，在管道上侧接近速度以2.6厘米/s或更高的速度达到的速度后，开始观察泵的速度。2）模型的施加水平使用底层管道（φ：0.6m x 5m）进行了测试。在测试的结果中，经过3的最大速度朝向VELCITY和SUPPIT veLocity的最大速率。和35.4cm/s。这是认为，管道中的泵浦速度主要受到显着的波高的影响，而不是受管道上部位置的接近速度影响。当获得的测试是新的，需要进一步的实验来揭示抽水速度和显着波高的高度之间的关系。3）新建带有螺钉系统的仪器以将表面流向底部的新构建，这是通过两种类型的螺钉组成的仪器（φ：0.3 m处的螺钉：0.1m的位置）的螺钉的实际速度，螺钉的实际速度。速度为0.3m/s。这就是确定的，底部位点螺钉与上位点的运动允许在底层流动，速率为18m^3/s。