TY - JOUR
T1 - Modelling scour and deposition in harbours due to complex tsunami-induced currents
AU - Son, Sangyoung
AU - Lynett, Patrick
AU - Ayca, Aykut
N1 - Funding Information:
This research was supported by the SeeAt Programme funded by the Korea Meteorological Administration (KMI2018‐09510) and by the Basic Science Research Programme through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1D1A1B03031262).
Publisher Copyright:
© 2019 John Wiley & Sons, Ltd.
PY - 2020/3/30
Y1 - 2020/3/30
N2 - In this paper, a set of models responsible for hydrodynamics, sediment transport, and morphological evolution are introduced with their theoretical backgrounds, and it is explained how they are fully connected through a two-way coupling to yield an integrated sediment transport model applicable to tsunami cases. In particular, a fully nonlinear Boussinesq model with bottom shear-induced rotational terms is chosen for the hydrodynamic model in order to provide a better physical approximation of tsunami-related, near-bed hydrodynamics in the nearshore. A finite-volume scheme, stable and suitable for phase-resolving model runs longer than 10 simulated hours, is adopted in the numerical discretization. The accuracy and applicability of the developed model are investigated through numerical tests on various sediment problems in the shallow region. Calculated results agree well with existing experimental records. Finally, an ocean-wide, field-scale simulation of the 2011 Tohoku-oki tsunami is attempted, with a focus on the localized effects of tsunami-induced morphological changes at Crescent City Harbor and Santa Cruz Harbor (USA). Consistent with the reported observations, strong and vortical velocity fields are generated through the model and result in significant changes in morphological configurations. Depth variations and areas of scouring and deposition are compared between modelled and observed records, and the results are discussed.
AB - In this paper, a set of models responsible for hydrodynamics, sediment transport, and morphological evolution are introduced with their theoretical backgrounds, and it is explained how they are fully connected through a two-way coupling to yield an integrated sediment transport model applicable to tsunami cases. In particular, a fully nonlinear Boussinesq model with bottom shear-induced rotational terms is chosen for the hydrodynamic model in order to provide a better physical approximation of tsunami-related, near-bed hydrodynamics in the nearshore. A finite-volume scheme, stable and suitable for phase-resolving model runs longer than 10 simulated hours, is adopted in the numerical discretization. The accuracy and applicability of the developed model are investigated through numerical tests on various sediment problems in the shallow region. Calculated results agree well with existing experimental records. Finally, an ocean-wide, field-scale simulation of the 2011 Tohoku-oki tsunami is attempted, with a focus on the localized effects of tsunami-induced morphological changes at Crescent City Harbor and Santa Cruz Harbor (USA). Consistent with the reported observations, strong and vortical velocity fields are generated through the model and result in significant changes in morphological configurations. Depth variations and areas of scouring and deposition are compared between modelled and observed records, and the results are discussed.
KW - Boussinesq model
KW - deposition
KW - finite-volume method
KW - scouring
KW - sediment transport
KW - tsunami-induced current
UR - http://www.scopus.com/inward/record.url?scp=85077858505&partnerID=8YFLogxK
U2 - 10.1002/esp.4791
DO - 10.1002/esp.4791
M3 - Article
AN - SCOPUS:85077858505
SN - 0197-9337
VL - 45
SP - 978
EP - 998
JO - Earth Surface Processes and Landforms
JF - Earth Surface Processes and Landforms
IS - 4
ER -