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

在潮汐输运模型分析研究的基础上，寻求内河水质优化管理的水力技术是内河水质优化管理的目标。该模型考虑了河道和浅水底泥沙侵蚀与泥沙淤积的关系。(1)在宽20 cm、高30 cm、长8 m的潮汐水槽中，实验模拟了潮汐河非定常流动的物理过程。结果表明，速度剖面是由两个方向的水流和速度大小组合而成的。许多关于河口至排水口分层的新知识被应用到后续的研究中。(2)分别综述了两层流动的内部水力学理论处理和实验处理的新方法，即通过收缩和两者结合的方法。运用最小、特征和泛函三种方法，对临界流的评价方法进行了总结和探讨，探讨了临界流分析的发展能力。(3)潮期潮河混合密度流既有水力特性又有不稳定问题，因为潮河内表面瞬态吸引或消失迅速。本文报道了根据Hiji河现场资料及其测量证实的分析考虑结果。(4)对北南达湾渔业苗圃内或苗圃下受污染的水体和沉积物的行为进行了连续的实地研究。阐明了在这种情况下亏氧水的特性。

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.