Quantification of tidal asymmetry and its nonstationary variations
Quantification of tidal asymmetry and its nonstationary variations
Tidal wave deformation and tidal asymmetry widely occur in tidal estuaries and lagoons. Tidal asymmetry has been intensively studied because of its controlling role on residual sediment transport and large‐scale morphological evolution. There are several methods available to characterize tidal asymmetry prompting the need for an overview of their applicability and shortcomings. In this work we provide a brief review and evaluation of two methods, namely, the harmonic method and the statistical method. The latter comprises several statistical measures that estimate the probability density function and various forms of skewness. We find that both the harmonic and statistical methods are effective and have complementary advantages. The harmonic method is applicable to predominantly semidiurnal or diurnal regimes, while the statistical methods can be used in mixed tidal regimes. Assisted by harmonic data, a modified skewness measure can isolate the contribution of different tidal interactions on net tidal asymmetry and also reveal its subtidal variations. The application of the skewness measure to nonstationary river tides reveals stronger tidal asymmetry during spring tides than neap tides, and the nonlinear effects of river discharges on tidal asymmetry in the upper and lower regions of long estuaries.
773-787
Guo, Lei Cheng
28d38848-a05c-4bba-a29c-2dc5fa983621
Wang, Zheng Bing
0bf73ba6-eed4-4ebe-8175-929d35912e3d
Townend, Ian
f72e5186-cae8-41fd-8712-d5746f78328e
He, Qing
94baedd4-45f0-436e-83d4-4e2ebcd1bec3
January 2019
Guo, Lei Cheng
28d38848-a05c-4bba-a29c-2dc5fa983621
Wang, Zheng Bing
0bf73ba6-eed4-4ebe-8175-929d35912e3d
Townend, Ian
f72e5186-cae8-41fd-8712-d5746f78328e
He, Qing
94baedd4-45f0-436e-83d4-4e2ebcd1bec3
Guo, Lei Cheng, Wang, Zheng Bing, Townend, Ian and He, Qing
(2019)
Quantification of tidal asymmetry and its nonstationary variations.
Journal of Geophysical Research: Oceans, 124 (1), .
(doi:10.1029/2018jc014372).
Abstract
Tidal wave deformation and tidal asymmetry widely occur in tidal estuaries and lagoons. Tidal asymmetry has been intensively studied because of its controlling role on residual sediment transport and large‐scale morphological evolution. There are several methods available to characterize tidal asymmetry prompting the need for an overview of their applicability and shortcomings. In this work we provide a brief review and evaluation of two methods, namely, the harmonic method and the statistical method. The latter comprises several statistical measures that estimate the probability density function and various forms of skewness. We find that both the harmonic and statistical methods are effective and have complementary advantages. The harmonic method is applicable to predominantly semidiurnal or diurnal regimes, while the statistical methods can be used in mixed tidal regimes. Assisted by harmonic data, a modified skewness measure can isolate the contribution of different tidal interactions on net tidal asymmetry and also reveal its subtidal variations. The application of the skewness measure to nonstationary river tides reveals stronger tidal asymmetry during spring tides than neap tides, and the nonlinear effects of river discharges on tidal asymmetry in the upper and lower regions of long estuaries.
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Accepted/In Press date: 2 January 2019
e-pub ahead of print date: 5 January 2019
Published date: January 2019
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An edited version of this paper was published by AGU. Copyright (2019) American Geophysical Union.”
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Local EPrints ID: 428454
URI: http://eprints.soton.ac.uk/id/eprint/428454
PURE UUID: faf57faa-d7ad-43aa-a93d-4a795a796be3
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Date deposited: 27 Feb 2019 17:30
Last modified: 16 Mar 2024 03:24
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Author:
Lei Cheng Guo
Author:
Zheng Bing Wang
Author:
Qing He
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