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Roles of the wind-driven vortex-pair flows on the ecosytem and the sediment transport processes in Funak Bay.

风驱动涡对流对富纳克湾生态系统和沉积物输送过程的作用。

基本信息

批准号：
10480121
负责人：
MIYAKE Hideo
金额：
$ 0.77万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Roles of wind-driven vortex-pair flows on the ecosystem and the sediment transport processes were investigated in Funak Bay. The rsults are summarized as follows:(1) Coastal water at three station around the bay showed the leewind flows whenever southeasterly wind blew. While, in the same periods the deep water of 80 m depth at the bay center flowed windward. These facts agree well with vortex-pair flows suggested by the numerical simulation model.(2) In the mid-summer, density driven-anticyclonic eddy dexeloped in the bay. The eddy showed a rigid body rotation and presumed to rotate aroud the bay center with 2.5 to 5 days period. The eddy was accurately maintained by geostrophic relation, and the coasta upwelling was suggested around the eddy.(3) Coasatal currents were observed at two opposite sites across Hidaka Basin to clarify coastal trapped waves. Surface currents at both stations in June and July were explained by the first mode of the shelf waves. At the lower layers of both stations, however, northwestward flows alternated simultaneously with southeasteward flows with about ten days period. While, at the lower layers of both stations in October, coastal currents flowed opposite direction without significant time lag.(4) Total mass fluxes increased abruptly during relative short time interval(2 to 4 days) in the bay center. These events seemed to relate closely to the meteorological and hydrographical conditons such as wind speeds, wind direction and wind waves. We presumed that southeasterly winds daving a long fetch, generate high wind waves around the northwest coast of the bay, and then the waves generate resuspentions of the bottom sediments. Finally, these sediments are transported to the bay center by the wind-driven vortex-pair flows.

研究了风驱动涡对流对富纳克湾生态系统和泥沙输运过程的影响。结果表明：（1）当东南风吹时，湾周三个测站的近岸水体均表现为背风流动。而同期湾中心80m深的深水向上风流动。这些事实与数值模拟模型所提出的涡对流动相吻合。(2)盛夏，湾内有密度驱动的反气旋式涡旋发展。涡旋呈刚体旋转，并推测其以2.5~5天为周期绕海湾中心旋转。地转关系准确地维持了涡旋的存在，涡旋周围存在海岸上升流。(3)在横跨日高盆地的两个相对的地点观测沿岸流，以澄清沿岸被困波。在6月和7月的两个站的表面电流解释的第一模式的货架波。但在两站的低层，西北气流和东南气流同时交替，周期约为10天。而在10月份，在两个站的下层，沿岸流流向相反，没有明显的时滞。(4)海湾中心的总质量通量在相对较短的时间间隔（2~4天）内突然增加。这些事件似乎与风速、风向、风浪等气象水文条件密切相关。我们推测，东南风daving一个长的取风，产生高风浪周围的西北海岸的海湾，然后波浪产生再悬浮的底部沉积物。最后，这些沉积物被风驱动的涡对流输送到海湾中心。