The tidal exchange in Lake Shinji under low discharge conditions.

Ishitobi, Yu; Kamiya, Hiroshi; Hayashi, Kyoichiro; Gomyoda, Manabu

doi:10.3739/rikusui.50.105

Cited by 16 publications

(6 citation statements)

References 8 publications

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“…Brackish water from Lake Shinji flows into Lake Nakaumi through Ohashi River forming the surface layer. Bottom layer with high salinity in Lake Nakaumi is occasionally driven by the wind-induced internal waves and tides towards the lake coast and upstream into Ohashi River and Lake Shinji (Ishitobi et al 1999(Ishitobi et al , 1989. The effect of wind stress on internal oscillation is greater than that of astronomical tides.…”

Section: Study Areamentioning

confidence: 99%

“…The westward water transport, mainly driven by MISSV, occurred often with the time scale over a few days to a week, contributing to the exchange of water between the two lakes (Nakata et al 2000). The salinity in Ohashi River, between Lakes Shinji and Nakaumi, vary acutely as a result of water moving back and forth with tides, freshwater input and other physical factors (Uye et al 2000;Ishitobi et al 1989Ishitobi et al , 1999.…”

Section: Study Areamentioning

confidence: 99%

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Analysis of the dynamic characteristics of seawater intrusion using partial wavelet coherence: a case study at Nakaura Watergate, Japan

Muchebve

Nakamura

Suzuki

et al. 2016

Stoch Environ Res Risk Assess

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Lake Shinji and Lake Nakaumi are coupled brackish lakes on the Japan Sea coast of Japan. Seawater from the Japan Sea frequently intrudes into Lake Nakaumi through the bottom. Salinity flux at Nakaura Watergate was analysed. Effects of river discharge, tide level, and meteorological forcing variables makes the seawater intrusion non-linear. To account for the non-linear characteristics, partial wavelet coherence (PWC) was used to analyse the impact of river discharge, tide level, and meteorological forcing variables on salinity flux after controlling the effect of all other forcing variables. PWC results show that tide level has impact on salinity flux over short cycles (limited to less than 4 days) throughout the analysis period with an average time lag of about 2 days. This suggests that astronomical tides are the dominant factor in the salinity intrusion processes. The river discharge largely influences salinity flux over medium cycles (5-16 days) during the months of June and July with an average time lag of 0.3 days. Atmospheric pressure occasional affect tide level, indirectly driving salinity transport. The study findings provide guidance for factors affecting salinity intrusion processes and further research.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Analysis of the dynamic characteristics of seawater intrusion using partial wavelet coherence: a case study at Nakaura Watergate, Japan

Muchebve

Nakamura

Suzuki

et al. 2016

Stoch Environ Res Risk Assess

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show abstract

“…It was also reported that the tidal exchange was the dominant component responsible for an upward salt flux, based on 25-hr observation of the same point at Matsue (ISHITOBI et al, 1989). These findings imply the simple manner of water movement in which the saline water mass with a declining front flows up and down through the river.…”

Section: Salinitymentioning

confidence: 67%

“…This consequently ensured a relatively long time period of upstream flow and might have allowed for the transportation of the water mass from Lake Nakanoumi to Lake Shinji through the long channel of the Ohashi River, showing the increase in salinity in the later stage of upstream flow during a diurnal variation, as pointed out by ISHITOBI et al (1989).…”

Section: Introductionmentioning

confidence: 90%

Physical Conditions of Saline Water Intrusion into a Coastal Lagoon, Lake Shinji, Japan.

Ishitobi¹,

Kamiya²,

Yokoyama³

et al. 1999

Jpn. J. Limnol.

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In a coastal lagoon, Lake Shinji, saline water intrusion frequently occurs from the lower Ohashi River. Continuous observation of current velocity, salinity and water level in the Ohashi River revealed that intermittent intrusions takes place when diurnal periods of astronomical tide coincide with the rising stage of meteorological tides during a low discharge from the influent Hii River.The dynamics of tidal currents and saline transport in the Ohashi River were examined by numerical simulation with a simplified onedimensional model using water level and salinity data from both river-channel ends. The calculated results reproduced well the observed time series of current velocity and salinity, though some disparity appeared under the two-layered structure. Related phenomena following the intrusion were described with respect to the formation of the stratified structure in Lake Shinji.

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“…It is a shallow oligohaline lake, which receives fresh water from the River Hii and empties to mesohaline Lake Nakaumi. However, mesohaline water flows back to Lake Shinji depending on the tidal conditions (Ishitobi et al 1989).…”

Section: Field Datamentioning

confidence: 99%

A method for detecting and identifying the lethal environmental factor on a dominant macrobenthos and its application to Lake Shinji, Japan

1990

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Abstract.A new method to single out the environmental factor limiting the life of any macrobenthic animal under stressed condition is proposed. The method is based on the assumption that the influence of each environmental factor on the life of a species can be expressed by an S-shaped function having lethal, limiting and non-limiting ranges, and the combined effect of several environmental factors is expressed by a multiple of these functions. To single out a lethal factor, we used the cumulative curve of abundance arranged in the order of each environmental factor. Comparison of these curves enables us to identify the most effective environmental factor limiting the life of a particular species and determine its effective range. Determination can be made from a single field observation without recourse to specially prepared experimental data if a sufficiently extensive survey was made in a field observation.

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The tidal exchange in Lake Shinji under low discharge conditions.

Cited by 16 publications

References 8 publications

Analysis of the dynamic characteristics of seawater intrusion using partial wavelet coherence: a case study at Nakaura Watergate, Japan

Analysis of the dynamic characteristics of seawater intrusion using partial wavelet coherence: a case study at Nakaura Watergate, Japan

Physical Conditions of Saline Water Intrusion into a Coastal Lagoon, Lake Shinji, Japan.

A method for detecting and identifying the lethal environmental factor on a dominant macrobenthos and its application to Lake Shinji, Japan

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