Cross-shore variations in morphodynamic processes of an open-coast mudflat in the Changjiang Delta, China: With an emphasis on storm impacts

On the open coast of the Changjiang Delta, waves temporally play their dominant roles in shaping the tidal-flat profile, especially during typhoons. Detailed analyses are presented of the variations in grain sizes of surface sediments and bed level, measured in the summer of 1999 at Nanhui mudflats,...

Full description

Saved in:
Bibliographic Details
Published inContinental shelf research Vol. 26; no. 4; pp. 517 - 538
Main Authors Fan, Daidu, Guo, Yanxia, Wang, Ping, Shi, John Z.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2006
Subjects
Brackish
Changjiang Delta
Intertidal mudflat
Marine
Morphodynamics
Open-coast
Saltmarsh
Sediment transport
Swells
Typhoon
INW, China, People's Rep., Changjiang Delta
Typhoon
Morphodynamics
Changjiang Delta
Swells
Open-coast
Intertidal mudflat
Saltmarsh
Sediment transport
Online AccessGet full text

Cover

More Information
Summary:On the open coast of the Changjiang Delta, waves temporally play their dominant roles in shaping the tidal-flat profile, especially during typhoons. Detailed analyses are presented of the variations in grain sizes of surface sediments and bed level, measured in the summer of 1999 at Nanhui mudflats, south flank of the Changjiang Delta, China. Cross-shore variations in bed level are distinctly site-specific in response to waves. The site-specific erosion rates are related to local water depth, sediment properties, vegetation, and exposure time per semidiurnal tidal cycle. A great difference exists between the higher and lower intertidal mudflats bordered at the mean sea level (MSL): the higher section is dominated by continuous accretion, while the lower section is characteristic of dynamic changes in erosion and accretion phases. Swells play their more important roles in shaping the profile than local wind-driven waves at the study mudflat, where swells propagate onshore without great barriers’ damping and local winds are not highly strengthened by distant typhoons. Storm processes are greatly modulated by tides. The magnitude of erosion is greater by a weak storm during spring tides than a strong storm during neap tides. Significant changes in entrainment capacity of tidal currents from neap to spring tides account for the different erosion and accretion models of the intertidal mudflat.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0278-4343
1873-6955
DOI:10.1016/j.csr.2005.12.011