The study of the transport timescale in the Changjiang Estuary

Wang Ya; He Qing; Shen Jian

doi:10.3969/j.issn.0253-4193.2014.01.006

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Wang Ya, He Qing, Shen Jian. The study of the transport timescale in the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(1): 48-55. doi: 10.3969/j.issn.0253-4193.2014.01.006

Citation:

Wang Ya, He Qing, Shen Jian. The study of the transport timescale in the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(1): 48-55. doi: 10.3969/j.issn.0253-4193.2014.01.006

Wang Ya, He Qing, Shen Jian. The study of the transport timescale in the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(1): 48-55. doi: 10.3969/j.issn.0253-4193.2014.01.006

Citation:

Wang Ya, He Qing, Shen Jian. The study of the transport timescale in the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(1): 48-55. doi: 10.3969/j.issn.0253-4193.2014.01.006

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The study of the transport timescale in the Changjiang Estuary

doi: 10.3969/j.issn.0253-4193.2014.01.006

1.
State Key Laboratory of Estuary & Coastal Research, East China Normal University, Shanghai 200062, China
2.
Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, VA., 23062, USA

Received Date: 2011-04-17

Abstract

Abstract

The water age concept is applied to the Changjiang Estuary to quantitatively study the influences of tide and river discharge on the transport timescale under the long-term mean flow discharge condition based on numerical model simulations. The study provides the spatial structure of the mean transport timescale of freshwater in the estuary. The result shows that it takes approximately 24 days for the water to be transported from the Xuliujing to the mouth of the Changjiang Estuary(122.5°E). The transport timescale is dominated by the river discharge on the upstream portion of the estuary prior to the bifurcation between the South Channel and the North Channel. The mean transport time is 8 day in this area. From the bifurcation location to the middle portion of the North Passage, both the river runoff and tide affect the transport timescale, and the transport time is about 16 days in this area, indicating that the transport rate is slower than both the upstream and the downstream. The stratification impact on transport timescale is evident in the Changjiang Estuary. A 6 day difference of transport timescale between the surface and bottom is observed. The numerical experiment results indicate that the tide is the key forcing affecting the transport timescale in the estuary, which increase exchange rate and decreased the transport time in the Changjiang Estuary. This study illustrates that the water age concept can not only be used to investigate the transport of water, but also provide the underlying hydrodynamics for the transport of pollutants and suspended sediment in the Changjiang Estuary.
- the Changjiang Estuary,
- tidal effect,
- transport timescale,
- water age,
- numerical model

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References(21)

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