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Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers

Min Zhang, Hao Yang, Qibang Tang, Huayang Cai, Zhenchang Zhu, Aichun Feng, Min Luo Orcid Logo, Hongkai Gao, Xin Tian

Advances in Water Resources, Volume: 143

Swansea University Author: Min Luo Orcid Logo

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DOI (Published version): 10.1016/j.advwatres.2020.103660

Abstract

As river flow debouches into the sea, it is affected by the tidal fluctuation at the estuary mouth, which results in a backwater zone, where the rising residual water level (averaged over a lunar day) in the landward direction is changing periodically. This is known as backwater hydrodynamics, espec...

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Published in: Advances in Water Resources
ISSN: 0309-1708
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa54508
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This is known as backwater hydrodynamics, especially the variation of the residual water levels that are controlled by the interplay between tide and river flows, while these hydrodynamics follow the traditional stage-river discharge relation in the upstream river-dominated region. However, the tidal asymmetry contributions to the residual water level that are caused by secondary tidal species (e.g., diurnal tide D1), overtide generation (e.g., the quarter-diurnal tide D4) and their interplay with river flow are poorly understood. In this study, we aim to understand the impacts of secondary and quarter-diurnal tidal species on the increase in residual water level in tidal rivers. To quantify the contributions made by different components, we decomposed the numerically computed subtidal friction into different components representing the contributions made by the river flow alone, the tide-river interaction, and tidal asymmetry due to the nonlinear interaction between different tidal species. The results show that the contribution by tidal asymmetry to the residual water level is minor, while the contributions by river flow and tide-river interaction are dominant, accounting for more than 90% and 80% at the upstream and downstream end of the estuary, respectively. The contribution made by river flow increases, while the tide-river interaction decreases in the landward direction. The semidiurnal tidal species (D2) predominantly control the residual water level induced by the tide-river interaction along the Yangtze estuary, which accounts for 70%, while the contributions made by the diurnal and quarter-diurnal tidal species are minor and comparable in magnitude in the seaward reach where tide-river interactions are important. The method proposed in this study to quantify the contributions of river flow and different tidal species to the residual water level will enhance our understanding of riverine and tidal impacts on estuarine backwater hydrodynamics and can be used to guide effective and sustainable water management in the Yangtze estuary and other tidal rivers with substantial river flow.</abstract><type>Journal Article</type><journal>Advances in Water Resources</journal><volume>143</volume><journalNumber/><paginationStart/><paginationEnd/><publisher>Elsevier BV</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>0309-1708</issnPrint><issnElectronic/><keywords>Residual water level, River flow, Tide-river interaction, Tidal asymmetry, Tidal species</keywords><publishedDay>1</publishedDay><publishedMonth>9</publishedMonth><publishedYear>2020</publishedYear><publishedDate>2020-09-01</publishedDate><doi>10.1016/j.advwatres.2020.103660</doi><url/><notes/><college>COLLEGE NANME</college><CollegeCode>COLLEGE CODE</CollegeCode><institution>Swansea University</institution><apcterm/><funders/><projectreference/><lastEdited>2022-11-15T16:34:25.4177339</lastEdited><Created>2020-06-18T11:47:33.6846497</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Aerospace, Civil, Electrical, General and Mechanical Engineering - General Engineering</level></path><authors><author><firstname>Min</firstname><surname>Zhang</surname><order>1</order></author><author><firstname>Hao</firstname><surname>Yang</surname><order>2</order></author><author><firstname>Qibang</firstname><surname>Tang</surname><order>3</order></author><author><firstname>Huayang</firstname><surname>Cai</surname><order>4</order></author><author><firstname>Zhenchang</firstname><surname>Zhu</surname><order>5</order></author><author><firstname>Aichun</firstname><surname>Feng</surname><order>6</order></author><author><firstname>Min</firstname><surname>Luo</surname><orcid>0000-0002-6688-9127</orcid><order>7</order></author><author><firstname>Hongkai</firstname><surname>Gao</surname><order>8</order></author><author><firstname>Xin</firstname><surname>Tian</surname><order>9</order></author></authors><documents><document><filename>54508__17529__85f0b1c1b4214f6ca9dff155b347ea76.pdf</filename><originalFilename>54508.pdf</originalFilename><uploaded>2020-06-18T11:49:30.2377851</uploaded><type>Output</type><contentLength>1973165</contentLength><contentType>application/pdf</contentType><version>Accepted Manuscript</version><cronfaStatus>true</cronfaStatus><embargoDate>2021-06-16T00:00:00.0000000</embargoDate><documentNotes>&#xA9; 2020. 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spelling 2022-11-15T16:34:25.4177339 v2 54508 2020-06-18 Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers 91e3463c73c6a9d1f5c025feebe4ad0f 0000-0002-6688-9127 Min Luo Min Luo true false 2020-06-18 As river flow debouches into the sea, it is affected by the tidal fluctuation at the estuary mouth, which results in a backwater zone, where the rising residual water level (averaged over a lunar day) in the landward direction is changing periodically. This is known as backwater hydrodynamics, especially the variation of the residual water levels that are controlled by the interplay between tide and river flows, while these hydrodynamics follow the traditional stage-river discharge relation in the upstream river-dominated region. However, the tidal asymmetry contributions to the residual water level that are caused by secondary tidal species (e.g., diurnal tide D1), overtide generation (e.g., the quarter-diurnal tide D4) and their interplay with river flow are poorly understood. In this study, we aim to understand the impacts of secondary and quarter-diurnal tidal species on the increase in residual water level in tidal rivers. To quantify the contributions made by different components, we decomposed the numerically computed subtidal friction into different components representing the contributions made by the river flow alone, the tide-river interaction, and tidal asymmetry due to the nonlinear interaction between different tidal species. The results show that the contribution by tidal asymmetry to the residual water level is minor, while the contributions by river flow and tide-river interaction are dominant, accounting for more than 90% and 80% at the upstream and downstream end of the estuary, respectively. The contribution made by river flow increases, while the tide-river interaction decreases in the landward direction. The semidiurnal tidal species (D2) predominantly control the residual water level induced by the tide-river interaction along the Yangtze estuary, which accounts for 70%, while the contributions made by the diurnal and quarter-diurnal tidal species are minor and comparable in magnitude in the seaward reach where tide-river interactions are important. The method proposed in this study to quantify the contributions of river flow and different tidal species to the residual water level will enhance our understanding of riverine and tidal impacts on estuarine backwater hydrodynamics and can be used to guide effective and sustainable water management in the Yangtze estuary and other tidal rivers with substantial river flow. Journal Article Advances in Water Resources 143 Elsevier BV 0309-1708 Residual water level, River flow, Tide-river interaction, Tidal asymmetry, Tidal species 1 9 2020 2020-09-01 10.1016/j.advwatres.2020.103660 COLLEGE NANME COLLEGE CODE Swansea University 2022-11-15T16:34:25.4177339 2020-06-18T11:47:33.6846497 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - General Engineering Min Zhang 1 Hao Yang 2 Qibang Tang 3 Huayang Cai 4 Zhenchang Zhu 5 Aichun Feng 6 Min Luo 0000-0002-6688-9127 7 Hongkai Gao 8 Xin Tian 9 54508__17529__85f0b1c1b4214f6ca9dff155b347ea76.pdf 54508.pdf 2020-06-18T11:49:30.2377851 Output 1973165 application/pdf Accepted Manuscript true 2021-06-16T00:00:00.0000000 © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license true English http://creativecommons.org/licenses/by-nc-nd/4.0/
title Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers
spellingShingle Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers
Min Luo
title_short Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers
title_full Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers
title_fullStr Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers
title_full_unstemmed Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers
title_sort Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers
author_id_str_mv 91e3463c73c6a9d1f5c025feebe4ad0f
author_id_fullname_str_mv 91e3463c73c6a9d1f5c025feebe4ad0f_***_Min Luo
author Min Luo
author2 Min Zhang
Hao Yang
Qibang Tang
Huayang Cai
Zhenchang Zhu
Aichun Feng
Min Luo
Hongkai Gao
Xin Tian
format Journal article
container_title Advances in Water Resources
container_volume 143
publishDate 2020
institution Swansea University
issn 0309-1708
doi_str_mv 10.1016/j.advwatres.2020.103660
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - General Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - General Engineering
document_store_str 1
active_str 0
description As river flow debouches into the sea, it is affected by the tidal fluctuation at the estuary mouth, which results in a backwater zone, where the rising residual water level (averaged over a lunar day) in the landward direction is changing periodically. This is known as backwater hydrodynamics, especially the variation of the residual water levels that are controlled by the interplay between tide and river flows, while these hydrodynamics follow the traditional stage-river discharge relation in the upstream river-dominated region. However, the tidal asymmetry contributions to the residual water level that are caused by secondary tidal species (e.g., diurnal tide D1), overtide generation (e.g., the quarter-diurnal tide D4) and their interplay with river flow are poorly understood. In this study, we aim to understand the impacts of secondary and quarter-diurnal tidal species on the increase in residual water level in tidal rivers. To quantify the contributions made by different components, we decomposed the numerically computed subtidal friction into different components representing the contributions made by the river flow alone, the tide-river interaction, and tidal asymmetry due to the nonlinear interaction between different tidal species. The results show that the contribution by tidal asymmetry to the residual water level is minor, while the contributions by river flow and tide-river interaction are dominant, accounting for more than 90% and 80% at the upstream and downstream end of the estuary, respectively. The contribution made by river flow increases, while the tide-river interaction decreases in the landward direction. The semidiurnal tidal species (D2) predominantly control the residual water level induced by the tide-river interaction along the Yangtze estuary, which accounts for 70%, while the contributions made by the diurnal and quarter-diurnal tidal species are minor and comparable in magnitude in the seaward reach where tide-river interactions are important. The method proposed in this study to quantify the contributions of river flow and different tidal species to the residual water level will enhance our understanding of riverine and tidal impacts on estuarine backwater hydrodynamics and can be used to guide effective and sustainable water management in the Yangtze estuary and other tidal rivers with substantial river flow.
published_date 2020-09-01T20:05:53Z
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score 11.047609

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