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Study on the Development of the Tidal Dam in Oder to Prevent the Oxygen-Deficiency in an Enclosed Bay

奥德市兴建潮汐坝防止封闭湾缺氧的研究

基本信息

批准号：
05680491
负责人：
KIMURA Haruyasu
金额：
$ 1.34万
依托单位：
Kochi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05680491/
关键词：
Tidal Dam Tide Oxygen deficincy Dissolved oxygen Bay Jets Natural energy Enviromental improvement 湾養殖漁場

项目摘要

In order to prevent the stagnation and to reduce the less oxygen bottom water in stratified seasons in a partly enclosed bay, a new technique, called the tide-dam, is suggested. The simple structure is designed to improve the water quality environment by generating the vertical circulation of the stratified sea water.The present study consists of the theoretical and experimental investigations on the hydraulic parameters of the tide-dam and the field experiments on the water quality improvement in an actual sea. In the former part, the principle of this idea, its basic structural design, the fundamental hydraulic parameters, the entrainment intensity of jet flows from ejecting pipes, and the way to determine the geometrical dimensions of this facility are investigated by hydraulic and numerical experiments. In the later part, the field experiments were carried out using the small scale prototype constructed in Uranouchi Bay. The above hydraulic model and the effectiveness of the dam op … More eration on the bottom water quality environment were verified. And the problems which may occur in the practical use are examined. The important results obtained in these studies are as follows :1) the hydraulic parameters of pipelines connecting the dam reservoir with a bay and the entrainment rate due to jet flows into the sea bottom are accurately estimated by the present model ;2) the tidal range of Uranouchi Bay is usually larger than that of the adjacent open sea, therefore, the tide-dam which utilizes only the tidal potential energy is a quite effective measure for water quality improvement ;3) the dissolved oxygen concentration of the stratified bottom sea water increases by the dam operation, and the decomposition process of the organic bottom mud is accelerated ;4) the dam reservoir can be used as the fish nursery because many kinds of fishes and shellfishes can live in the dam reservoir during the field experiment.To turn this technique to practical use, the quantitative analysis of the improved environment of bottom sea water, the measure against adhesive organisms on the connecting pipes and the economic effect should be investigated as the next step. Less

在部分封闭的海湾中，为了防止淤滞和减少分层季节底水的低氧，提出了一种称为潮坝的新技术。简单的结构设计是为了通过产生分层海水的垂直循环来改善水质环境。本研究包括对潮坝水力参数的理论和实验研究，以及对实际海域水质改善的现场试验。在第一部分中，通过水力实验和数值实验对该装置的原理、基本结构设计、基本水力参数、喷射管射流的夹带强度以及几何尺寸的确定方法进行了研究。后半部分，利用在天王星湾建造的小型样机进行了现场试验。验证了上述水力模型的有效性，以及坝体对底水水质环境的影响。并对实际应用中可能出现的问题进行了分析。研究的重要结果如下：1)该模型准确地估计了大坝水库与海湾连接管道的水力参数和射流进入海底的卷带速率；2)天王星湾的潮差通常大于邻近的外海，因此，仅利用潮汐能的潮汐坝是一种相当有效的水质改善措施；3)大坝运行增加了分层海底海水溶解氧浓度，加速了有机底泥的分解过程；4)在野外试验中，多种鱼类和贝类可在坝区水库中生活，可作为鱼类苗圃。为了将该技术应用于实际，下一步应定量分析改善海底环境的效果、防止连接管道上粘附生物的措施和经济效果。少