Journal
ESTUARINE COASTAL AND SHELF SCIENCE
Volume 187, Issue -, Pages 204-215Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2017.01.013
Keywords
Freshwater input; Box model; Circulation; Flood; Naruse River; Matsushima Bay
Categories
Funding
- project A Scheme to Revitalize Agriculture and Fisheries in Disaster Area through Deploying Highly Advanced Technology - Agriculture, Forestry, and Fisheries Research Council
- Reconstruction Agency, Japan
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To investigate the influence of a river discharging outside a bay on circulation in the bay, we carried out current and salinity measurements from mooring systems and hydrographic observations in Matsushima Bay, Japan, and off the Naruse River, which discharges outside the bay. Previously, enhancement of horizontal circulation in the bay induced by increased freshwater input from the Naruse River was reported to have degraded the seedling yield of wild Pacific oysters in the bay, but the freshwater inflow from the river was not directly measured. Our hydrographic observations in Katsugigaura Strait, approximately 3 km southwest of the Naruse River mouth, detected freshwater derived from the river. The mooring data revealed that freshwater discharged by the river flowed into Matsushima Bay via the strait and that the freshwater transport increased when the river was in flood. The inflow through straits other than Katsugigaura was estimated by a box model analysis to be 26-145 m(3) s(-1) under normal river discharge conditions, and it decreased to 6 m(3) s(-1) during flood conditions. During flood events, the salt and water budgets in the bay were maintained by the horizontal circulation: inflow occurred mainly via Katsugigaura Strait, and outflow was mainly via other straits. (C) 2017 Elsevier Ltd. All rights reserved.
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