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Study of transport and mixing processes in the Banda Sea by tidal currents

班达海潮流输送和混合过程的研究

基本信息

批准号：
04640416
负责人：
AWAJI Toshiyuki
金额：
$ 1.22万
依托单位：
KYOTO 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：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

We have investigated the characteristics of tides and tidal currents in the Indonesian Seas, with particular emphasis on the predominant constituents, the barotropic M_2 and K_1 components. The calculated harmonic constants of the M_2 and K_1 tides agree well with those obtained from extensive tide gauge observations : the mean root-mean-square errors between models and observations for M_2 and K_1 over the entire Indonesian Seas are 11.2 and 8.65cm, respectively, smaller than previous studies. The features of the tidal current field are qualitatively similar to those reported by Wyrtki [1961]. Relatively strong tidal currents are found in the Java Sea and in the vicinities of the narrow straits such as the Lombok and Malacca Straits. Tracking of numerous labeled particles in the calculated velocity field chearly shows that the tidal currents play essential roles in the transport and mixing processes in the Indonesian Seas. For example, in the eastern Indonesian Seas a significant clockwise residual circulation appears around Buru Island due primarily to the tidal rectification over variable bottom topography, with a minor impact from the nonlinear effects around narrow straits. The tide-induuced residual transport from the Seram Sea to the eastern Banda Sea attains about 3.8 Sv (1 Sv=10^6m^3s^<-1>), comparable to that of the Indo-Pacific throughflow along the eastern route. In the western Indonesian Seas (the Java Sea and the Makassar Strait) the residual transport is much smaller than the throughflow transport along the western route. Our result suggests, however, that the properties of water flowing through this route could be modificd by strong tidal mixing around the shelf of the southern Makassar Strait ant the Lombok Strait.

我们研究了印度尼西亚海的潮汐和潮流特征，特别是主要成分，正压M_2和K_1。计算的M_2和K_1潮汐调和常数与大量验潮仪观测得到的结果吻合较好：整个印尼海M_2和K_1潮汐模型与观测值之间的均方根误差分别为11.2和8.65 cm，小于前人的研究结果。潮流场的特征与Wyrtki[1961]所报道的特征具有本质上的相似性。在爪哇海以及龙目岛海峡和马六甲海峡等狭窄海峡附近发现了较强的潮汐流。对计算的速度场中大量标记粒子的早期跟踪表明，潮流在印度尼西亚海的输送和混合过程中起着至关重要的作用。例如，在印度尼西亚东部海域，布鲁岛周围出现明显的顺时针剩余环流，这主要是由于变化的海底地形上的潮汐整流，狭窄海峡周围的非线性效应对其影响较小。从色拉姆海到班达海东部的潮汐剩余输运约为3.8Sv(1Sv=10^6m^3s~(-1))，与沿东线的印度洋-太平洋贯穿流的输运相当。在印度尼西亚西部海域(爪哇海和马卡萨海峡)，残留输送远小于西部路线的贯流输送。然而，我们的结果表明，流经这条路线的水的性质可能会被马卡萨海峡南部和龙目岛海峡大陆架周围的强烈潮汐混合所改变。