Print Email Facebook Twitter Strong Inland Propagation of Low‐Frequency Long Waves in River Estuaries Title Strong Inland Propagation of Low‐Frequency Long Waves in River Estuaries Author Guo, Leicheng (East China Normal University) Zhu, C. (TU Delft Coastal Engineering; East China Normal University) Wu, Xuefeng (East China Normal University) Wan, Yuanyang (Shanghai Estuarine and Coastal Science Research Center) Jay, David A. (Portland State University) Townend, Ian (University of Southampton) Wang, Zhengbing (TU Delft Coastal Engineering; Deltares) He, Qing (East China Normal Univeristy) Date 2020 Abstract Tidal waves traveling into estuaries are modified by channel geometry and river flow. The damping effect of river flow on incident astronomical tides is well documented, whereas its impact on low‐frequency tides like MSf and Mm is poorly understood. In this contribution, we employ a numerical model to explore low‐frequency tidal behavior under varying river flow. MSf and Mm are locally generated by frictional mechanisms inside an estuary, and they are larger in amplitude far upstream in tidal rivers and persist landward of the point of tidal extinction. Increasing river flow nonlinearly modulates the longitudinal variations of MSf and Mm amplitudes. This is dynamically explained by flow‐enhanced asymmetry in subtidal friction over the spring‐neap (MSf) and perigee‐apogee (Mm) cycles, respectively. Estuaries act as frequency filters, where low‐frequency waves decay at a smaller rate and propagate more inland than high‐frequency waves. Strong inland penetration of low‐frequency tides informs compound flood management. Subject MSflow-frequencyriver dischargesubtidal friction To reference this document use: http://resolver.tudelft.nl/uuid:83f0ea0d-1ce4-43a6-af94-8c737919988b DOI https://doi.org/10.1029/2020GL089112 Embargo date 2021-03-28 ISSN 0094-8276 Source Geophysical Research Letters, 47 (19), 1-11 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2020 Leicheng Guo, C. Zhu, Xuefeng Wu, Yuanyang Wan, David A. Jay, Ian Townend, Zhengbing Wang, Qing He Files PDF GRL_Guo.pdf 2.22 MB Close viewer /islandora/object/uuid:83f0ea0d-1ce4-43a6-af94-8c737919988b/datastream/OBJ/view