期刊
JOURNAL OF COASTAL RESEARCH
卷 -, 期 -, 页码 151-155出版社
COASTAL EDUCATION & RESEARCH FOUNDATION
DOI: 10.2112/SI85-031.1
关键词
Tidal asymmetry; basin morphology; stability relationships; tidal flats and channels
资金
- Natural Science Foundation of Jiangsu Province [BK20160862]
- National Natural Science Foundation of China (NSFC) [41606104, 51620105005]
- National Key Research and Development Program of China [2016YFC0401505]
- Fundamental Research Funds for the Central Universities, China [2016B00714]
Tidal basin morphology is strongly dependent on the condition of tidal asymmetry which may result in either net import (flood-dominance) or export (ebb-dominance) of sediment. Based on the one-dimensional (1D) shallow water equations, various stability relationships have been developed linking tidal parameters with basin geometry. This study revisits the widely used numerical stability relationship developed by Friedrichs and Aubrey (1988), using a 2D depth-averaged model which is able to describe a more extensive flow field and more realistic bathymetries. Model comparison between 1D and 2D models indicates that excluding or including intertidal areas as a momentum conveying component can highly affect the tidal velocity distribution and magnitude, particularly when the relative water depth is large (i.e., the ratio between tidal amplitude and mean water depth is small). Meanwhile, the tidal distortion parameters (relative tidal phase 2M(2)-M-4 and tidal amplitude ratio M-4/M-2) derived from the 2D model appear to be more strongly controlled by the relative water depth (a/h) than that in the 1D model. Further research can be devoted to developing more generic stability relationships which can be applied in a more quantitative manner.
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