DEVELOPMENT OF TFIE METHOD FOR MAINTENANCE OF WATER ROUTE FRONT OF DISCHARGE GATE LINES ON ARIAKE SEA COAST

有明海岸排泄闸门线前水路维护TFIE方法的开发

• 批准号: 13660246
• 负责人: KATO Osamu
• 金额: $ 1.98万
• 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: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13660246/
• 关键词: Ariake clay; dead weight consolidation; water route; water content; critical erosional rate; jet theory; flash water; screw; 干潟排水; フラッシュ; 限界流速; 排水樋門

Concerning to maintain the water route in front of discharge gate setting at land reclamation, the effective methods are said to remove the mud deposit by flash water, and/or erode by the screw of the fishing boat. Thus, to obtain the basic aspects for developing the water route maintenance system, the field survey for the mechanism of the mud accumulation was carried out, then the experiments were attempted to analyze following items, 1) the erosional and depositional behaviors of fine sediments, 2) the change of critical erosion rate of mud according to dead weight consolidation and 3) the characteristics of the erosional rate by a screw of boatIn the bottom area of Ariake bay, Nanaura tidal land in Saga prefecture, the deposition rate of mud at water route region was measured as about 5cm/day, when the water was not discharged from the gate.The experiment using Ariake clay with sea water in the annular rotating channel elucidated the change of water contents, the cohesion and the critical erosional rate of the clay during 72hr after the dead weight consolidation occurring. In addition, the vertical distribution of water contents ratio was also revealed in mud area. In this experiment, the progress of consolidation by passing time was obviously shown as the change of water content ratio at 10cm depth from the bottom level; 900% at the beginning time subsequently turning to 540% and 300% after 6hr and 72hr, respectively.The flow characteristics caused by rotating of a screw were accountable with the Jet theory, and revealed its action against the bottom. As the axis velocity of flow was decayed with distance from screw -1 powers, the flow rate on the bottom was widen according to Gaussian distribution.The results obtained in this experiment were new and believed to contribute to develop the water route maintenance system.

关于在陆地开垦时保持水路的设置前，据说有效的方法是通过闪光灯清除泥浆沉积物，和/或用渔船的螺钉侵蚀。因此，为了获得开发水路线维护系统的基本方面，进行了泥浆积累机理的现场调查，然后尝试进行实验来分析项目之后，1）良好沉积物的侵蚀性和沉积行为，2）2）根据死重固结的泥浆的临界率的变化，并根据死亡重量固定率的固定速率，以及3）螺钉的特征，3）在传奇县的潮汐土地，水路路线区域的泥浆的沉积速率约为5厘米/天，当水从门中排出时。在环形旋转通道中使用Ariake Clay用海水使用Ariake Clay阐明了水的变化，凝聚力，凝聚力，凝聚力和粘土的关键腐蚀性率在72hr的重量下进行了重量调节。另外，在泥浆区域还揭示了水含量比的垂直分布。在该实验中，通过时间的巩固进展明显显示为距底部10厘米深度的水含量比的变化。在开始时，有900％在6小时和72小时后转向540％和300％。螺钉旋转引起的流动特性对射流理论负责，并揭示了其对底部的作用。随着流动的轴速度随螺钉-1功率的距离而衰减，根据高斯分布，底部的流速扩大。本实验中获得的结果是新的，并且据信有助于开发水路线维护系统。