Mechanisms of Rapid Flow caused by Tidal_Fluvial Flow Interaction in Inland Waterways of the Mekong Delta

8th International Conference on Environment Science and Engineering

生态环境科学

Takagi, H.^1 ; Anh, T.T.^2 ; Anh, L.T.^1 ; Thao, N.D.^3 ; Takabatake, T.^4 ; Nakamura, R.^5

Tokyo Institute of Technology, Tokyo, Japan^1

Vietnam Institute of Seas and Islands, Hanoi, Viet Nam^2

Ho Chi Minh City University of Technology, Ho Chi Minh, Viet Nam^3

Waseda University, Tokyo, Japan^4

Toyohashi University of Technology, Aichi, Japan^5

关键词: Flood season;    Historical floods;    Mekong Delta;    River discharge;    Ship handling;    Storm surges;    Tidal currents;    Urban areas;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/167/1/012001/pdf
DOI  :  10.1088/1755-1315/167/1/012001

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The present study investigates the river flow intensifications in the urban areas of the Mekong Delta, which are characterized by tributaries, channels, and low-lying lands in addition to the main stream of the Mekong Delta system. A hydraulic model is used to simulate velocities under the influence of both ocean tide and river discharge. A series of numerical simulations estimate that a rapid flow occurs along the tributary in flood season, reaching up to 1.8 m/s during the 2013 historical flood, which can be reproduced by assigning the net downstream river discharge of 9200 m3/s as well as tidal current. A unique mechanism of flow intensification caused by "tidal blockage", which occurs in the flood tide phase during the flood season, is also identified. Such locally intensified flows could be further strengthened particularly during abnormal high water events such as storm surges and tsunamis, resulting in ship handling difficulties or a risk of overturning small ships.