Interaction of plumes formed by plural rivers

Research Project

Project/Area Number	26887025
Research Category	Grant-in-Aid for Research Activity Start-up
Allocation Type	Single-year Grants
Research Field	Meteorology/Physical oceanography/Hydrology
Research Institution	Kobe University
Principal Investigator	NAKADA SATOSHI 神戸大学, 海事科学研究科(研究院), 助教 (70540871)
Project Period (FY)	2014-08-29 – 2016-03-31
Project Status	Completed (Fiscal Year 2015)
Budget Amount *help	¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000) Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000) Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords	河川プリューム / 数値シミュレーション / 海底斜面 / 陸海連関 / 河川流量 / 海表面塩分 / 有色溶存有機物 / 海色衛星 / 沿岸海洋 / 河川間隔 / 陸海連環 / 海色衛星データ
Outline of Final Research Achievements	The formation process for upstream spreading plume (Type 2 plume) formed by plural river was investigated by using the numerical simulation and products based on the ocean color satellite observation. We conducted the numerical experiments in the variation of the river runoff, river interval, density stratification, and bottom slope. The simulated results indicated that the key factors are river runoff and interval to control the length of Type 2 plume. The increase of the river runoff elongates the upstream excursion of Type 2 plume, but the large river interval shortens the excursion. We identified the emergence of Type 2 plume in the Japanese coastal seas based on the numerical experiments. By using the map of sea surface salinity estimated from the satellite-based products, observed result of Type 2 plume were collected to analyze the dynamical behaviors of the plumes.