Journal
ESTUARINE COASTAL AND SHELF SCIENCE
Volume 202, Issue -, Pages 54-68Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2017.12.003
Keywords
Simpson number; Unsteadiness number; Mixing number; Mond River Estuary; Persian Gulf
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Funding
- Iranian National Institute for Oceanography and Atmospheric Science (INIOAS) at the Persian Gulf Centre for Oceanography
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This study investigates a rare situation at the Mond River Estuary in the Persian Gulf, in which the classical estuarine density gradient coincides with hypersaline runoff entering from saline soils upstream of the estuary after severe precipitation. This builds a unique estuarine setting, where two salt water masses, one originating from the coastal ocean and the other being discharged from upstream confine a range of almost freshwater in the middle of estuary. This freshwater lens estuary (FLE) situation includes two saltwater sources with opposing senses of estuarine circulation. Therefore, the tidal damping by the strong river flood can occur, especially during neap tide when high Unsteadiness number (similar to 0.04) signified ebb oriented condition which was induced by straining residual lateral circulation near the FLE mouth. Transition from well-mixed to weak strain induced periodic stratification regimes indicated the importance of the spring-neap tidal variations. Close to the mouth, a 13.66-day periodic tidal asymmetry from the triad K-1-O-1-M-2 (ebb-dominance during spring tide and flood-dominance in neap tide) was overcome by higher harmonics. (C) 2017 Elsevier Ltd. All rights reserved.
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