Peculiarities of distribution and transformation of water in the Keret’ River tidal estuary
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Tidal irrigation
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Tidal river
Salt water
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Tidal irrigation
Saltwater intrusion
Tidal river
Groundwater discharge
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River delta
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This paper describes various features of tidal effects on the behavior of a salt wedge and on the mechanism of mixing between the salt water and the fresh water in the vicinity of a river mouth. The studies have been performed through experiments, field observations and theoretical considerations. The condition upon which the fresh water begins to show an intermittent flow-pattern owing to an increase of the tidal action, and the criterion of a transition of the mixing type from negligible into intense, were obtained, with two dimensionless parameters X and 6. The former parameter X is given by A = A0/U0T0, in which T0 is the tidal period, A0 is the tidal amplitude of the sea level, and U0 is the temporal mean velocity of the fresh water at the river mouth. The latter parameter 9 is the so-called Keulegan number. Besides, it came evident that a tidal motion of the salt wedge couldn't be understood without a consideration of the internal wave inside the mouth, which were induced by the tide, in addition to a direct effect of the tide.
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Construction of the west end of the Cross Florida Barge Canal changed the regimen of the lower Withlacoochee River. The investigation was made to determine how salt water from the Gulf of Mexico moves in the river-canal complex, and how the factors that control salt-water movement--tides and discharge--have changed since canal construction. In the river below the bypass channel, salt water moves inland as a wedge beneath the fresh water with upstream tidal flows and back toward the Gulf with downstream tidal flows. The salt front in the river tends to move farthest upstream near times of relatively high water, or higher high water preceded by relatively high higher low water, especially during of after several days of rising mean tide level.
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This paper describes various features of tidal effects on the behavior of a salt wedge and on the mechanism of mixing between the salt water and the fresh water in the vicinity of a river mouth. The studies have been performed through experiments, field observations and throretical considerations. The condition upon which the fresh water begins to show an intermittent flow-pattern owing to an increase of the tidal action, and the criterion of a transition of the mixing type from negligible into intense, were obtained, with two dimensionless parameters λ and θ. The former parameter λ is given by λ = Ao/UoTo, in which To is the tidal period, Ao is the tidal amplitude of the sea level, and Uo is the temporal mean velocity of the fresh water at the river mouth. The latter parameter θ is the so-called Keulegan number. Besides, it came evident that a tidal motion of the salt wedge couldn't be understood without a consideration of the internal wave inside the mouth, which were induced by the tide, in addition to a direct effect of the tide.
River mouth
Tidal river
Dimensionless quantity
Tidal irrigation
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Fresh water
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Although tidal flats with good natural environment spread on both banksides in the lower reach of the Yoshii River, the tidal flat area considerably decreased owing to the river bank and dam construction works. The Otogo tidal flat is the remaining tidal area in the Yoshii river estuary. This study proposes a candidate site for tidal flat creation in an estuary depending on numerical analysis results. First, physical environment of the Otogo tidal flat was clarified by examining the observed salinity data and numerically obtained salinity and hydraulic data. Second, a promising site for creating a new tidal flat, which has a physical environment similar to that of the Otogo tidal flat was investigated and proposed on the left bank side of 4-4.6 km from the river mouth, which is approximately 2 km upstream of the Otogo tidal flat. Finally, some numerical experiments were conducted assuming the sediment replenishment and construction of new groynes. The results show that the extracted site has a similar sustainability with the Otogo tidal flat against the flood flow with several years return period.
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Tidal irrigation
Tidal range
Tidal river
Barotropic fluid
River delta
Discharge
Yangtze river
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Tidal irrigation
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Tidal river
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There are three major types of tidal channels along the coast of the Huanghe (Yellow) River Delta: tidal inlets, tidal creeks, and tidal channels developed from abandoned river channels. The tidal inlets develop mainly in two areas with weak erosion and barrier islands. The tidal channels formed from abandoned river channels mainly developed in the area of the new delta lobes formed since 1934. Tidal creeks developed in the intertidal zone and distributed along almost all parts of the Huanghe River Delta coast, but their scales and features are different.
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