Analysis of the interactive processes of water environment between rivers and coastal regions.

河流与沿海地区水环境相互作用过程分析。

• 批准号: 15560441
• 负责人: YAGI Hiroshi
• 金额: $ 2.37万
• 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 (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560441/
• 关键词: estuary; water temperature; urban effluent; heat budget; suspended sediment; transport process; tidal currents; Tokyo bay; 長期水温変化; 外海影響; 熱フラックス; 朔望変動; 河川; 潮流; 浮泥; 干潟; 流動モデル; 水温; ノリ養殖施設

In order to understand the interactive process of water environment between rivers and coastal regions, the long term thermal structure analysis for Tokyo bay and its inflowing river (Ara river), and transport dynamics analysis of suspended sediment between Ariake bay and Chikugo river were performed in the present study. Firstly, to reveal long-term stream temperature variation associated with composite environmental change due to urbanization and climate change, data of stream temperature, urban effluent temperature and air temperature monitored for more than two decades are analyzed in conjunction with the urbanization in the central Tokyo area. It is clarified that the temperature of urban effluents has been increasing considerably, especially in winter and early spring, and stream temperatures in the study area show a coincidental increasing trend at the rate of 0.1℃/year and more in the same seasons. It is found that the urban thermal effluent is much more influential to the stre … More am temperature changes than the direct influence of air temperature increase mainly due to urbanization. Secondly, to understand the influence of laver aquaculture facilities on the current system and sediment transport in Ariake Bay, micro-scale field experiments to measure the hydraulic resistance and velocity distribution of a compartment of an aquaculture facility and macro-(bay-) scale numerical simulations of the hydraulic and suspended particulate matter(SPM) transport were conducted. The results of the field experiment showed that the resistance coefficient of a laver aquaculture net varied from 0.01 to 0.02, depending on the quantity of laver. The resistances of the nets and poles per a compartment of laver aquaculture facility were of the same order of magnitude as the bottom friction, but differences in temporal variation were observed during a tidal cycle. The surface velocities were reduced downstream from the aquaculture facility owing to the resistance of the laver nets and the thickness of this surface boundary layer was approximately 1 m at the downstream end of the facility. The numerical simulation of the head of Ariake Bay showed that the tidal currents and SPM concentrations are reduced in the laver farming ground area, and inversely increased in the ship path regions due to the relatively differences of hydraulic resistances. Less

为了解东京湾及其入流河川（Ara河）的长期热结构分析，以及有明湾与赤果河之间悬沙输运动力学分析，研究了河川与沿海地区水环境的相互作用过程。首先，为了揭示城市化和气候变化导致的复合环境变化与河流温度的长期变化关系，本文结合东京市中心地区20多年来的河流温度、城市污水温度和空气温度监测数据进行了分析。结果表明，城市出水温度呈明显上升趋势，特别是冬季和早春，研究区河流温度在同一季节以0.1℃/年以上的速度同步上升。研究发现，城市热排放对地温变化的影响远大于以城市化为主的气温升高的直接影响。其次，为了解紫菜养殖设施对有明湾水流系统和泥沙输运的影响，进行了微尺度的现场试验，测量了养殖设施隔室的水力阻力和流速分布，并进行了宏观（湾）尺度的水力和悬浮颗粒物（SPM）输运数值模拟。田间试验结果表明，紫菜养殖网的阻力系数随紫菜数量的不同在0.01 ~ 0.02之间变化。紫菜养殖设施每隔室的网和杆阻力与底部摩擦力在同一数量级，但在潮汐周期内存在时间变化差异。由于紫菜网的阻力，养殖设施下游的表面速度降低，该表面边界层的厚度在设施下游端约为1 m。有明湾水头的数值模拟结果表明，由于水力的相对差异，紫菜种植区域的潮流和SPM浓度降低，而船道区域的潮流和SPM浓度则相反。少

项目成果

Fluid resistance of laver culture facility and its influence on tidal currents and SPM transport in Ariake Sea.

有明海紫菜养殖设施的流体阻力及其对潮流和SPM输送的影响。

• 发表时间: 2004
• 期刊: Annual Journal of Coastal Engineering, JSCE Vol.51
• 作者: Yagi;H.;Ishida;H.;Takahashi;A.;Nadaoka;K.;Tamura;H.;Kotani;M.
• 通讯作者: M.

Long-term Stream Temperature Change due to Urbanization -Case Study for the Central Tokyo Area

城市化导致的长期河流温度变化 - 东京中部地区的案例研究

• 发表时间: 2004
• 期刊: International Conference on Water Sensitive Urban Design : Cities as Catchments
• 作者: Kinouchi;T.;Yagi;H.
• 通讯作者: H.

東京湾及び周辺水域の長期水温変動特性

东京湾及周边海域长期水温波动特征

• 发表时间: 2004
• 期刊: 土木学会海岸工学論文集 51
• 作者: 八木宏;石田大暁;山口肇;木内豪;樋田史郎;石井光廣
• 通讯作者: 石井光廣

ノリ養殖施設の流体抵抗と潮流・浮泥輸送への影響

海藻养殖设施流体阻力及其对潮流和浮泥输送的影响

• 发表时间: 2004
• 期刊: 土木学会海岸工学論文集 51
• 作者: 八木宏;石田大暁;高橋亜依;灘岡和夫;田村仁;小谷正幸
• 通讯作者: 小谷正幸

冬期の荒川下流部における水・熱輸送の実態解明

阐明荒川下游冬季水热输送的实际状况

• 发表时间: 2005
• 期刊: 第60回土木学会年次学術講演会講演概要集 (印刷中)
• 作者: 宮本 守;木内 豪;八木宏;深見和彦
• 通讯作者: 深見和彦