Sakawa River plume in Sagami Bay, Japan under weak wind condition: numerical simulation of coastal ocean dynamics and in situ observations for validation

This study proposes a method for estimating river plume length from water levels and river discharge rates. A numerical model for coastal ocean dynamics was refined by comparing thermohaline fields calculated using the model with those measured off the mouth of the Sakawa River in Sagami Bay, Japan....

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Bibliographic Details
Published in:Journal of marine science and technology 2024-03, Vol.29 (1), p.221-243
Main Authors: Arai, Riwa, Nishi, Yoshiki, Fujiwara, Yasunori, Zhao, Jinrui, Jamil, Muhammad Zeeshan
Format: Article
Language:English
Subjects:
Automotive Engineering
Engineering
Engineering Design
Engineering Fluid Dynamics
Mathematical models
Mechanical Engineering
Numerical models
Ocean dynamics
Offshore Engineering
Original Article
Regression analysis
River discharge
River flow
River plumes
Rivers
Salinity
Salinity effects
Simulation
Surface salinity
Tidal currents
Water discharge
Water levels
Water transport
Wind
Citations: Items that this one cites
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Description
Summary:This study proposes a method for estimating river plume length from water levels and river discharge rates. A numerical model for coastal ocean dynamics was refined by comparing thermohaline fields calculated using the model with those measured off the mouth of the Sakawa River in Sagami Bay, Japan. The model successfully captured the reduction in salinity within the surface 1.0-m layer caused by riverine water transport. The simulated surface salinity maps revealed that the dynamic motions of the river plumes were primarily driven by one of the two diurnal occurrences of tidal current intensification. Regression analyses of the simulated results demonstrated that the river plume lengths were closely correlated with the water levels and river discharge rates, and that they could be accurately estimated from preceding river discharge rates under weak wind condition.
ISSN:0948-4280
1437-8213
DOI:10.1007/s00773-024-00985-6