Analysis on Tidal Transport between Stratified Flow and Sediment Erosion in River and Sallow Water

河流和浅水层流与泥沙侵蚀之间的潮汐输送分析

• 批准号: 05660277
• 负责人: OHASHI Gyozo
• 金额: $ 1.41万
• 依托单位: Ehime 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-05660277/
• 关键词: Tidal river flow; Stratification prosess; Stratified transport; Sediment erosion; Inland water; Hydraulic experiment; Field study; 潮汐流模型の実験; 潮汐流の成層過程; 潮汐波による底質浮上過程; 閉鎖性浅海湾の水理特性; 底質汚染の実態調査; 感潮河川・浅海域

The aim for the optimum management of water quality in inland water is to seek for hydraulic techniques besed on analytical researches by tidal transport model. The model takes account of the relation between startified flow and sediment erosion in channel and shallow water bottom.(1) The physical processes of unsteady flow in tidal river are simulated experimentally in the tidal flume (width : 20 cm, high : 30 cm, length : 8 m) . This result shows that velocity profiles are composed of many patterns given by the combination of two directions of currents and magnitudes of velocity. Many fresh knowkledge about the stratification from river mouth to a drainage gate are applied to following studies.(2) The new theoretical and experimental treatments on the internal hydraulics of two-layr flows over a sill, through a contraction and the combination of them are reviewed respectively. By means of three approach (Minimal, Characteristics and Functional) , the evaluation of critical flow are summarized and discussed on the ability of development to the flow analysis.(3) The well mixed density flow in tidal river during a tidal period includes both hydraulic characteristics and un-stability problems, because of the rapid transient atratification or disappearance of internal surface. The paper reports the results of an analytical consideration depended on field data and their measurement confirmation in the Hiji River.(4) Field studies on the behavior of polluted water and sediment in or under fishery nursery in the Kitanada Bay are carried out continuously.The characteristics depended on the behavior of deficit oxygen water in the circumstances are clarified.

内陆水水质优化管理的目的是在潮汐输运模型分析研究的基础上寻求水力技术。该模型考虑了起动水流与河道及浅水底沙侵蚀的关系。(1)在宽20 cm、高30 cm、长8 m的感潮水槽中，对感潮河道非恒定流的物理过程进行了实验模拟。这一结果表明，流速剖面是由两个方向的水流和速度大小的组合所给出的许多图案组成的。在后续的研究中，引入了许多关于河口至排水闸段地层的新知识。(2)分别综述了跨底坎双层流、收缩双层流以及两者结合的双层流内部水力学的新理论和实验处理方法。从最小流、特征流和泛函流三个方面对临界流的评价方法进行了总结，并讨论了临界流对流动分析的发展能力。(3)感潮河道中的均匀异重流在感潮期既有水力特性，又有由于内表面的快速过渡而引起的不稳定性问题。该论文报告了基于日治河现场数据及其测量确认的分析考虑结果。(4)通过对北田湾养殖场内及养殖场下污染水体和沉积物行为的连续实地研究，阐明了缺氧水体在该环境下的行为特征。

项目成果

G.Ohashi: "Hydraulic characteristics of two layred flows in the Hiji River (Analysis on the characteristics of stratification based on field data)" Trans.of J.S.I.D.R.E.No.174. 83-93 (1994)

G.Ohashi：“日地川两层状水流的水力特性（基于现场数据的层状特性分析）”Trans.of J.S.I.D.R.E.No.174。

大橋行三: "肱川感潮域における2成層密度流の水理特性" 農業土木学会論文集. No.174. 83-93 (1994)

Yukizo Ohashi：“比地川潮汐区双层密度流的水力特性”日本农业土木工程师学会学报第 174. 83-93 号（1994 年）。

G.Ohashi: "On the Hydraulices of Two-layr Flows through the Gradual Constriction in Open-channel" Trans.of J.S.I.D.R.E.No.173. 111-126 (1994)

G.Ohashi：“论明渠逐渐收缩的两层水流的水力学”Trans.of J.S.I.D.R.E.No.173。

藤原正幸: "A Numerical Model on Estimating Reasonable Inflow Rate in a Nursery Aquaculture Pond." 水産工学. Vol.30(2). 119-128 (1993)

Masayuki Fujiwara：“估算苗圃水产养殖池塘合理流入量的数值模型”，第 30 卷（2）（1993 年）。

大橋 行三: "肱川感潮域における2成層密度流の水理特性・・・観測資料に基づく成層特性の解析・・" 農業土木学会論文集. No.174. 83-93 (1994)

Yukizo Ohashi：“比地川潮汐区两种分层密度流的水力特征...基于观测数据的分层特征分析...”日本农业和土木工程学会学报第 174. 83-93 号（ 1994）