Effects of wave-current interactions on sediment dynamics in Hangzhou Bay during Typhoon Mitag
The hydrodynamics and sediment characteristics of muddy estuaries and coasts during typhoons are closely related to the geomorphic evolution, ecological environment, and economic development of coastal zones. Taking the macro-tidal turbid Hangzhou Bay (HZB) as an example, the sediment characteristic...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-08-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.931472/full |
| _version_ | 1811284128167886848 |
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| author | Li Li Jiayang Xu Yihan Ren Xiao Hua Wang Yuezhang Xia |
| author_facet | Li Li Jiayang Xu Yihan Ren Xiao Hua Wang Yuezhang Xia |
| author_sort | Li Li |
| collection | DOAJ |
| description | The hydrodynamics and sediment characteristics of muddy estuaries and coasts during typhoons are closely related to the geomorphic evolution, ecological environment, and economic development of coastal zones. Taking the macro-tidal turbid Hangzhou Bay (HZB) as an example, the sediment characteristics and effects of wave-current interactions on sediment dynamics during Typhoon Mitag were studied using a fully-calibrated numerical model. The model considered tide-wave sediment interactions and the reconstructed typhoon wind field. Net sediment fluxes were controlled by residual currents and suspended sediment concentration (SSC). The combined interactions of currents and waves led to a high SSC during the typhoon. Under calm weather conditions, the impact of wave-current interactions (wave dissipation, form drag, wave radiation stress, mean current advection and refraction) was small, except for the combined bottom stresses. The combined bottom stress was the primary wave-current interaction that changed sediment resuspension and increased SSC, particularly in shallow waters or during storms. The advection term, which played an essential role in reducing SSC in HZB, mainly affected SSC by increasing the velocity. The wave dissipation term enhanced vertical mixing, which involved the vertical exchange of suspended sediment and currents. In the shallow waters of the southern bay, the wave dissipation term mostly led to decreased bottom stresses, increased currents, decreased SSC, and increased SSC in deep waters. The effects of form drag, wave radiation stress, and refraction terms on the suspended sediment dynamics were relatively small. These findings provide a theoretical foundation for the study of dynamic geomorphology in macro-tidal estuaries. |
| first_indexed | 2024-04-13T02:23:58Z |
| format | Article |
| id | doaj.art-9cfdfa692686403aa5980d27bd123d84 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-13T02:23:58Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-9cfdfa692686403aa5980d27bd123d842022-12-22T03:06:50ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-08-011010.3389/feart.2022.931472931472Effects of wave-current interactions on sediment dynamics in Hangzhou Bay during Typhoon MitagLi Li0Jiayang Xu1Yihan Ren2Xiao Hua Wang3Yuezhang Xia4Ocean College, Zhejiang University, Zhoushan, ChinaOcean College, Zhejiang University, Zhoushan, ChinaOcean College, Zhejiang University, Zhoushan, ChinaThe Sino-Australian Research Consortium for Coastal Management, School of Science, University of New South Wales at Canberra, Canberra, ACT, AustraliaOcean College, Zhejiang University, Zhoushan, ChinaThe hydrodynamics and sediment characteristics of muddy estuaries and coasts during typhoons are closely related to the geomorphic evolution, ecological environment, and economic development of coastal zones. Taking the macro-tidal turbid Hangzhou Bay (HZB) as an example, the sediment characteristics and effects of wave-current interactions on sediment dynamics during Typhoon Mitag were studied using a fully-calibrated numerical model. The model considered tide-wave sediment interactions and the reconstructed typhoon wind field. Net sediment fluxes were controlled by residual currents and suspended sediment concentration (SSC). The combined interactions of currents and waves led to a high SSC during the typhoon. Under calm weather conditions, the impact of wave-current interactions (wave dissipation, form drag, wave radiation stress, mean current advection and refraction) was small, except for the combined bottom stresses. The combined bottom stress was the primary wave-current interaction that changed sediment resuspension and increased SSC, particularly in shallow waters or during storms. The advection term, which played an essential role in reducing SSC in HZB, mainly affected SSC by increasing the velocity. The wave dissipation term enhanced vertical mixing, which involved the vertical exchange of suspended sediment and currents. In the shallow waters of the southern bay, the wave dissipation term mostly led to decreased bottom stresses, increased currents, decreased SSC, and increased SSC in deep waters. The effects of form drag, wave radiation stress, and refraction terms on the suspended sediment dynamics were relatively small. These findings provide a theoretical foundation for the study of dynamic geomorphology in macro-tidal estuaries.https://www.frontiersin.org/articles/10.3389/feart.2022.931472/fullsscsediment dynamicswave-current interactionsTyphoon MitagHangzhou Bay |
| spellingShingle | Li Li Jiayang Xu Yihan Ren Xiao Hua Wang Yuezhang Xia Effects of wave-current interactions on sediment dynamics in Hangzhou Bay during Typhoon Mitag Frontiers in Earth Science ssc sediment dynamics wave-current interactions Typhoon Mitag Hangzhou Bay |
| title | Effects of wave-current interactions on sediment dynamics in Hangzhou Bay during Typhoon Mitag |
| title_full | Effects of wave-current interactions on sediment dynamics in Hangzhou Bay during Typhoon Mitag |
| title_fullStr | Effects of wave-current interactions on sediment dynamics in Hangzhou Bay during Typhoon Mitag |
| title_full_unstemmed | Effects of wave-current interactions on sediment dynamics in Hangzhou Bay during Typhoon Mitag |
| title_short | Effects of wave-current interactions on sediment dynamics in Hangzhou Bay during Typhoon Mitag |
| title_sort | effects of wave current interactions on sediment dynamics in hangzhou bay during typhoon mitag |
| topic | ssc sediment dynamics wave-current interactions Typhoon Mitag Hangzhou Bay |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.931472/full |
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