Influence of oceanic water intrusion on the coastal environment off Tama River Estuary of Tokyo bay in winter

Yagi, Hiroshi; Pokavanich, Tanuspong; Ise, Hajime; Nadaoka, Kazuo; Ariji, Ryuichi; Furudoi, Ken; Geshi, Hiroyuki; Furudono, Taro; Oono, Yukimasa

doi:10.2208/proce1989.55.1086

Cited by 3 publications

(3 citation statements)

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“…Depending on the depth of the water and the location of the pycnoclines, hypoxia occurred not only at the bottom near the sediments, but well up into the water column at Line-A, B, C and G. The location of the pycnoclines was same as the location of 3.0 mg -l dissolved oxygen concentration at Line-A, and Line-B. Pycnoclines inclined to the east coast at Line-A, B, C, and 3.0 mg -l dissolved oxygen concentration also inclined to the east coast at Line-A, B, C. Strong south wind forced the oceanic water to return to the bay mouth and induced the coastal upwelling to occur at the west coast of the bay (Yagi et al, 2008b). Thus, hypoxic water mass could be moving from C12 (the east coast of the bay) to C1 (the west coast of the bay) during this Monitoring Campaign of Bay Environment.…”

Section: Natural Conditionmentioning

confidence: 91%

“…During the observation day, hypoxic water at Chiba light beacon appeared to be kept decreasing. This reason is that the low oxygen water mass on the bottom water moved to west in response to south wind (Yagi et al, 2008b). Continuous bottom water dissolved oxygen data for Chiba light beacon indicated fluctuations between 0 and 3 mgl -1 from June 23 to July 3.…”

Section: Natural Conditionmentioning

confidence: 99%

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Spatial Distribution of Hypoxic Water Mass Based on a Monitoring Campaign of Bay Environment at Tokyo Bay, Japan.

Horie¹,

Furukawa

Okada

2011

Int. Conf. Coastal. Eng.

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In 2008, a monitoring campaign of bay environment had been done at Tokyo Bay, Japan. This campaign has been a part of implementation of the bay renaissance plan enacted since 2005. The data was collected by 46 institutions in 568 monitoring points in around 2nd July 2008. Dissolved oxygen, salinity and temperature were monitored in sea area basically from the surface to the bottom with 1.0 m vertical spacing at the monitoring points. We analyzed spatial distribution of hypoxic water mass based on this monitoring campaign data. Following results are obtained that 1) Measurement results showed that the bottom hypoxic water mass dominated in the head of Tokyo bay, while dissolved oxygen concentration was high condition in tidal flat and in shallow water, such as the Tama River estuary, Sanbanze tidal flat area and the Ara River estuary. 2) We proposed new parameters, such as CDZ and VDZ, which showed characteristic of spatial distribution of hypoxic water. The proposed parameters could be related to the temporal and spatial development of hypoxic water. Thus, these parameters will extend the interpretation of conservative bottom dissolved oxygen (DOB) data to understand the dynamics of hypoxic water.

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Section: Natural Conditionmentioning

confidence: 91%

Section: Natural Conditionmentioning

confidence: 99%

Spatial Distribution of Hypoxic Water Mass Based on a Monitoring Campaign of Bay Environment at Tokyo Bay, Japan.

Horie¹,

Furukawa

Okada

2011

Int. Conf. Coastal. Eng.

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“…Therefore, D-runway construction has an advanced ecosystem impact on the surrounding water environment, especially oxygen deficiency in the summer. Yagi et al [18] demonstrated through field observations and numerical analysis that a combination of north wind and south wind is an important forcing factor influencing the intrusion of the offshore oceanic water into the Tama River estuary. A comprehensive EIA (Environmental Impact Assessment) model for water environment due to the construction of the D-runway has been proposed [19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Development and Decline of Hypoxia by Using Monitoring Data Collected near The Tama River Estuary of Tokyo Bay

Karim

Hafeez

Nakamura

2022

J. of Wat. & Envir. Tech.

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Hypoxia develops in bottom water in enclosed water bodies with limited water exchange and long water retention times, especially near the river mouth. The inner part of Tokyo Bay is an example. This study is focused on the development and decline of hypoxia around the Haneda Airport Drunway, which was constructed nearby the river mouth of the Tama River, and a comparison was made between monitoring data at a monitoring post at the Haneda Airport and those far off the river mouth nearby Kawasaki artificial island. Multiple sets of data have been incorporated, including water quality data collected every hour in monitoring posts by MLIT, and meteorological data of JMA. The hypoxia period and the average thickness of hypoxia were calculated, and the sudden recovery of DO was analyzed. The analysis revealed general characteristics of hypoxia development and its decline. Especially, three mechanisms of the DO recovery process were found to be dominated nearby the river mouth: strong and continued southerly wind, the intrusion of dense oceanic water, and extreme freshwater discharge of the Tama River associated with the typhoon. Year-to-year variations of hypoxia periods or volume at Haneda Airport showed no increasing tendency of hypoxia after the construction of the D-runway.

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Temporal and spatial variations of residual currents around the Tama River mouth in Tokyo Bay

Yagi¹,

Pokavanich

Nadaoka

et al. 2009

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal E

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Temporal and spatial variations of a velocity field around Tama River mouth in Tokyo Bay were investigated based on intensive field surveys and numerical simulation in summer 2006. Measurement results showed that the residual currents off Tama River mouth were strongly affected by wind, and which had negative correlation with the residual current around the river mouth area. The integrated analysis of the observation and numerical simulation results suggested that these negative correlations of the residual currents between offshore and river mouth region was induced by geometry dependent horizontal circulation (clockwise or anticlockwise) depending on the offshore southward (south wind period) or northward residual currents (north wind period).

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Influence of oceanic water intrusion on the coastal environment off Tama River Estuary of Tokyo bay in winter

Cited by 3 publications

References 1 publication

Spatial Distribution of Hypoxic Water Mass Based on a Monitoring Campaign of Bay Environment at Tokyo Bay, Japan.

Spatial Distribution of Hypoxic Water Mass Based on a Monitoring Campaign of Bay Environment at Tokyo Bay, Japan.

Analysis of Development and Decline of Hypoxia by Using Monitoring Data Collected near The Tama River Estuary of Tokyo Bay

Temporal and spatial variations of residual currents around the Tama River mouth in Tokyo Bay

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