Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Coastal Erosion Caused by River Mouth Migration on Cuspate Delta: An Example from Thanh Hoa, Vietnam

Dinh Van Duy
* ORCID logo ,
Tran Van Ty
,
Cao Tan Ngoc Than
,
Cu Ngoc Thang
,
Huynh Thi Cam Hong
,
Lam Tan Phat
,
Nguyen Thai An
,
Tran Nhat Thanh
,
Nguyen Trung Viet
ORCID logo ,
Hitoshi Tanaka
ORCID logo
Version 1 : Received: 24 July 2023 / Approved: 25 July 2023 / Online: 26 July 2023 (09:09:28 CEST)

How to cite: Duy, D.V.; Ty, T.V.; Than, C.T.N.; Thang, C.N.; Hong, H.T.C.; Phat, L.T.; An, N.T.; Thanh, T.N.; Viet, N.T.; Tanaka, H. Coastal Erosion Caused by River Mouth Migration on Cuspate Delta: An Example from Thanh Hoa, Vietnam. Preprints 2023, 2023071784. https://doi.org/10.20944/preprints202307.1784.v1 Duy, D.V.; Ty, T.V.; Than, C.T.N.; Thang, C.N.; Hong, H.T.C.; Phat, L.T.; An, N.T.; Thanh, T.N.; Viet, N.T.; Tanaka, H. Coastal Erosion Caused by River Mouth Migration on Cuspate Delta: An Example from Thanh Hoa, Vietnam. Preprints 2023, 2023071784. https://doi.org/10.20944/preprints202307.1784.v1

Abstract

Coastal erosion is threatening the infrastructures of coastal community at the Ma River mouth in Thanh Hoa province, Vietnam. When coastal erosion happens, people try to prevent it by emergency solutions like hard structures. However, this approach usually leads to more severe problem since the mechanism for coastal erosion is not investigated and understood properly. In this study the long-term configuration of Ma River mouth in Thanh Hoa Province, Central Vietnam has been investigated using Landsat imagery from 1987 to 2023. An analytical solution of one-line model for shoreline change was also employed to calculate the sand discharge from Ma River as well as the diffusion coefficient for sand transported along-shore by breaking waves. There was an asymmetric configuration of the Ma River mouth during the last 37 years. The sand supply from the Ma River is around 350,000 m3/year. This amount of sand is going mainly to the northern beach of the Ma River delta (from 55% to 75%). The asymmetric morphology of the Ma River mouth delta is the trigger for severe coastal erosion reported recently. This study provides a quick and easy method to investigate the morphological change of cuspate deltas where measured data is limited.

Keywords

coastal erosion; cuspate delta; wave-dominated delta; analytical solution; sediment supply; Landsat; Ma River; Thanh Hoa

Subject

Environmental and Earth Sciences, Oceanography

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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