内湾の海水交換に関する研究

概要

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The concept of tidal exchange is an effectual method for the estimate of water pollution of a long time scale in a bay connected with the ocean through an inlet channel. A part of water entering the bay on a flood tide stays in the bay and the remainder returns to the ocean on a successive ebb tide with new bav water which outflows for the first time. Accordingly, the stayed water and the new bay water are exchanged in the bay. So if the historical process of mechanism of this stayed water could be explained, the mass balance equation of tracer in the bay would be given. In this paper, in the first place, the composition of the stayed water is analyzed with tidal exchange ratios rE, defined by Parker et al. (1972), and rF, defined by Kashiwai (1977). In the second place, under this analytical result the mass balance equation of tracer in the bay is given with the two new tidal exchange ratios for tracer. These ratios are estimated in two cases, i. e. the one case of flow volume on the ebb tide being very smaller than volume of bay water, and the another cace of both tracer concentration of bay water being very longer than one of ocean water and inflow of tracer of land water being little. Finally, this analysis is applied to non-conservative tracer and the mass balance equation of non-conservative tracer is given with the two new tidal exchange ratios for this tracer.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文