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A comprehensive study on hydraulic environments to clarify nutrient transport in land-ocean interconnecting zones

水力环境综合研究，以阐明陆地-海洋互连区的养分输送

基本信息

批准号：
10450181
负责人：
NADAOKA Kazuo
金额：
$ 6.85万
依托单位：
Tokyo Institute of Technology
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

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450181/
关键词：
nutrient transport ocean current structure filed observations coastal environments land-ocean interconnecting zone terrestrial & ocean influence river plume coral reef 海-陸接合領域

项目摘要

With various field measurements, satellite remote sensing and numerical simulations, in the present study, it has been attempted to clarify the current field and the associated sediment and nutrient transports in coastal areas as land-ocean interconnecting zones, with the influence of terrestrial and ocean water on them. The measurements and analyses have been done for Kashima-nada and Tokyo Bay as typical open and semi-enclosed coastal zones, respectively, and Okinawa coasts as typical coral reef areas. The field measurements have been done by means of, 1) in situ sensor systems with buoy-mounted thermo- and salino-meters and Chlorophyl-a and turbidity meters and bottom-mounted ADCPs and EMCs with pressure-type wave gauges, 2) ship-borne sensors of similar items, and 3) a HF-radar system to detect spatial distribution of sea-surface velocities.In Kashima-nada, it has been succeeded, with the data analysis and the corresponding 3-D numerical simulation of the current field, in clarifyi … More ng the dynamical behavior of the river plume from Naka river on the occasion of the big flood in late August of 1998. The rapid growth of phyto-plankton in a near-shore zone was observed just after the flooding, in which appreciable amount of nutrients may be transported with the river plume. Besides, the dynamic behavior of the coastal water during a typhoon was investigated, with the change of the coastal water quality due to the approach of the Kuroshio water, and the generation of internal tidal waves at the shelf edge and their subsequent deformation and damping on the shelf. In Tokyo Bay, the analysis of the field data obtained both in winter and late summer elucidated highly unsteady characteristics of the approach of the Kuroshio water to the bay mouth and the subsequent exchange with the bay water. Further,. by developing an advanced numerical model for 3-D current computation coupled with a regional atmospheric model, a computation of oil spill dispersion with high accuracy was performed. In Okinawa coral reefs, the current, sediment and thermal environments with influence from river and ocean on them were clarified by field observations. A coastal current field was investigated with field measurements and a numerical simulation to analyze possible long-distance transport of coral eggs. Less

通过各种野外测量、卫星遥感和数值模拟，本研究试图阐明作为陆海连通带的沿海地区的流场以及与之相关的沉积物和营养盐的输送，以及陆地和海水对它们的影响。分别以鹿儿岛和东京湾为典型的开放海岸和半封闭海岸，冲绳海岸为典型的珊瑚礁区域进行了测量和分析。现场测量的手段有：1)浮标式测温仪、盐度计和Chlorophyl-a、浊度计的现场传感器系统和底部安装的压力式波浪仪的ADCP和EMC系统；2)类似物件的船载传感器；3)探测海面速度空间分布的高频雷达系统。在鹿儿岛，通过数据分析和相应的三维流场数值模拟，在clarifyi…上取得了成功1998年8月下旬那卡河大洪水期间河流羽流的动力行为。洪水发生后不久，浮游植物在近岸区域迅速生长，相当数量的营养物质可能随河流羽流输送。此外，还研究了台风期间近岸海水的动态行为，包括黑潮水的逼近引起近岸水质的变化，以及陆架边缘内潮波的产生及其在陆架上的变形和衰减。在东京湾，对冬季和夏末获得的现场资料的分析揭示了黑潮水进入湾口以及随后与湾水交换的高度非定常特征。更远的，。通过发展一个先进的三维水流数值模式，并结合区域大气模式，进行了高精度的溢油扩散计算。通过对冲绳珊瑚礁的野外观测，阐明了河流和海洋对冲绳珊瑚礁的水流、沉积物和热环境的影响。通过现场测量和数值模拟研究了一个沿岸流场，以分析珊瑚卵可能的长距离输送。较少