Water Science and Engineering 2019, 12(2) 162-168 DOI:   https://doi.org/10.1016/j.wse.2019.05.005  ISSN: 1674-2370 CN: 32-1785/TV

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Mouth bar
Flume experiment
Sediment transport

Flume experimental study on evolution of a mouth bar under interaction of floods and waves

Li Yan a, b, Men-wu Wu a, b,*, Ying Chen a, c, Yao Wu a, b, Tian-sheng Wu a, b

a Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou 510611, China
b Key Laboratory of the Pearl River Estuarine Dynamics and Associated Process Regulation, Ministry of Water Resources,          Guangzhou 510610, China
 c College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China


Based on the characteristics of hydrodynamics and sediment transport in the bar area in the Modaomen Estuary, a flume experiment was performed to study the evolution of the longitudinal profile of the mouth bar. The mouth bar evolution was investigated under the impacts of floods with different return periods as well as flood-wave interaction. The results show that floods with different return periods had significant influences on the evolution of the river mouth bar. Particularly on the inner slope of the mouth bar, the sediment was substantially active and moveable. The inner slope and the bar crest tended to be remarkably scoured. The erosion was intensified with the increase of the magnitude of floods. Moreover, the bar crest moved seawards, while the elevation of the bar crest barely changed. Under the flood-wave interaction, a remarkable amount of erosion on the inner and outer slopes of the mouth bar was also found. The seaward displacement of the bar crest under the interaction of floods and waves was less than it was under only the impact of floods, while more deposition was found on the crest of the mouth bar in this case.

Keywords  Modaomen   Mouth bar   Wave   Flood   Flume experiment   Sediment transport  
Received 2018-10-23 Revised 2019-04-20 Online: 2019-06-30 
DOI: https://doi.org/10.1016/j.wse.2019.05.005

The work was supported by the Changjiang River Scientific Research Institute (CRSRI) Open Research Program (Grant No. CKWV2017499/KY) and the National Natural Science Foundation of China (Grant No. 51779280).

Corresponding Authors: Men-wu Wu
Email: wumw@163.com
About author:

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