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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

本研究通过各种现场观测、卫星遥感和数值模拟，试图阐明作为陆-海连接带的沿海地区的流场及其沉积物和营养盐输运，以及陆地和海洋水对它们的影响。分别以鹿岛滩和东京湾为典型的开放和半封闭海岸带，以冲绳海岸为典型的珊瑚礁区，进行了测量和分析。现场测量是通过以下方式完成的：1）现场传感器系统，包括安装在船上的温度计和盐度计、叶绿素a和浊度计以及安装在底部的ADCP和带有压力型波浪仪的EMC，2）类似项目的船载传感器，3）高频雷达系统，以探测海面速度的空间分布。在鹿岛那达，这已经成功。通过数据分析和相应的三维流场数值模拟， ...更多信息研究了纳卡河在1998年8月下旬大洪水时的羽流动力学行为。洪水过后，近岸区浮游植物迅速生长，其中可观的营养盐可能与河流羽流一起输送。此外，还研究了台风期间近岸海水的动力学行为，黑潮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，在冬季和夏末获得的现场数据的分析阐明了黑潮水的方法，海湾口和随后的交换与海湾水的高度不稳定的特性。此外，。摘要通过发展一个先进的三维海流数值模式，并与区域大气模式相耦合，实现了高精度的溢油扩散计算。通过对冲绳珊瑚礁的野外观测，阐明了该珊瑚礁的水流、沉积物和热环境以及河流和海洋对其的影响。通过对一个海岸流场的观测和数值模拟，分析了珊瑚卵可能的远距离输运。少