Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Tsunami induced scour around a monopile foundation
Date
2016-11-20
Author
Fuhrman, David R
Larsen, Bjarke E
Baykal, Cüneyt
Sumer, B Mutlu
Metadata
Show full item record
Item Usage Stats
178
views
0
downloads
Cite This
While the run-up, inundation, and destructive potential of tsunami events has received considerable attention in the literature, the associated interaction with the sea bed i.e. boundary layer dynamics, induced sediment transport, and resultant sea bed morphology, has received relatively little specific attention. The present paper aims to further the understanding of tsunami-induced scour, by numerically investigating tsunami-induced flow and scour processes around a monopile structure, representative of those commonly utilized as offshore wind turbine foundations. The simulations are based on a model solving Reynolds averaged Navier-Stokes (RANS) equations, fully coupled with turbulence closure, bed and suspended load sediment transport descriptions, and a seabed morphological model. The model was developed and utilized in simulating breaker bar morphology by Jacobsen et al. (2014); It has been additionally been used in simulating wave induced scour beneath pipelines by Fuhrman et al. (2014) and Larsen et al. (2016) as well as scour around a monopile by Baykal et al. (2015). Due to the large computational expenses it is presently only feasible to simulate such scour processes around a monopile at model (laboratory) spatial and temporal scales. Therefore, prior to conducting such numerical simulations involving tsunami-induced scour, it is necessary to first establish a methodology for maintaining similarity of model and full field scales. To achieve hydrodynamic similarity we will select the flow parameters such that we maintain similarity in terms of the diameter-based Froude number, as well as the boundary layer thickness-to-diameter ratio δ/D. Equating the Froude number ensures that the adverse pressure gradient induced by the presence of the structure itself will be similar at both model and field scales, i.e. that the ratio of the excess stagnation pressure head in front of the monopile will be maintained. Similarly, by maintaining similarity in δ/D, we ensure that the relative size of the horseshoe vortex, which is expected to largely govern the scouring process, will be similar at both model and full scales. This strategy also yields reasonable similarity in the expected tsunami period-to-scour time scale ratio. As an example, three full tsunami periods have been simulated in succession, taking a full scale period of 13 min. Snapshots of the computed scour hole at selected times when the flow is rightward (left sub-plots) as well as leftward (right sub-plots) are depicted Figure 1. These snapshots illustrate the generally stepwise build-up of scour on the two opposing sides of the monopile during each successive half-cycle of the simulated tsunami. A complementary, simple and practical engineering method for predicting tsunami-induced scour is likewise developed, founded upon existing experimentally-based expressions for use in steady current scour, but invoking the boundary layer thickness and Shields parameter expected from tsunami wave events i.e. it effectively combines both current-like and wave-like properties of tsunamis (see e.g. Williams and Fuhrman, 2016).
URI
https://hdl.handle.net/11511/86278
Conference Name
35th International Conference on Coastal Engineering, 17 - 20 Kasım 2016
Collections
Department of Civil Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
TSUNAMI MAXIMUM RUNUP AND FOCUSING THROUGH EARTHQUAKE SOURCE PARAMETERS
Sharghivand, Naeimeh; Aşık, Mehmet Zülfü; Department of Engineering Sciences (2022-8-11)
In this study, the N-wave profile is fitted to the seafloor deformation for a large set of earthquake scenarios, i.e., assuming that the seafloor deformation resulting from an earthquake instantaneously transfers to the sea surface. Hence, the N-wave parameters are identified with respect to the earthquake source parameters allowing to express the initial tsunami profile in terms of the earthquake source parameters. Then, the maximum tsunami runup is presented through the earthquake fault plane parameters u...
Tsunami Induced Sedimentation in Ports A Case Study in Haydarpasa Harbor Marmara Sea
Kıan, Rozıta; Velioğlu, Deniz; Yalçıner, Ahmet Cevdet; Zaytsev, Andrey (null; 2015-12-14)
The movement of sea bottom or ground sediment material by tsunami cause erosion, deposition and hence bathymetry and topogrphy changes. The unexpected depth decrease at some parts of the enclosed basins and harbors may result in lack of movements of vessels. In order to understand the sediment movement inside the enclosed basins, Haydarpasa port in the sea of Marama is selected as a case study to understand the motion of tsunamis inside the port and identify their effects on harbor functions. The highest po...
Tsunami hydrodynamics in coastal zones
Özer, Ceren; Yalçıner, Ahmet Cevdet; Department of Civil Engineering (2012)
This study analyzes the parameter “hydrodynamic demand” that is also defined by the square of Froude Number representing the damage of tsunami waves on structures and coastlines, and other hydrodynamic parameters, i.e., the distribution of instantaneous flow depths, runup values and the direction of maximum currents, occurred during tsunami inundation by using advanced numerical modeling. The analyses are performed on regular-shaped basins with different bottom slopes and real-shaped topographies using diff...
Fault-based Probabilistic Seismic Hazard Assessment of the Makran Subduction Zone and the Chaman Transform Fault in Pakistan: Emphasis on the Effects of Source Characterization of Megathrust
Shah, S Tanvir; Özacar, Atilla Arda; Gülerce, Zeynep (2019-04-07)
Seismic source characterization (SSC) for probabilistic seismic hazard assessment (PSHA) in regions characterized by subduction megathrusts involves a considerable degree of ambiguity due to the complex nature of subducting plates and large seismogenic depths. The lack of detailed geologic, seismic, and geodetic histories increase the uncertainties involved in constraining the parameters of the SSC model. The enigma is further enhanced in the regions where thin skinned accretionary prism faults associated w...
Earthquake imprints on a lacustrine deltaic system: The Kurk Delta along the East Anatolian Fault (Turkey)
Hubert-Ferrari, Aurelia; El-Ouahabi, Meriam; Garcia-Moreno, David; Avşar, Ulaş; Altinok, Sevgi; Schmidt, Sabine; Fagel, Nathalie; Cagatay, M. Namik (2017-08-01)
Deltas contain sedimentary records that are not only indicative of water-level changes, but also particularly sensitive to earthquake shaking typically resulting in soft-sediment-deformation structures. The Kurk lacustrine delta lies at the south-western extremity of Lake Hazar in eastern Turkey and is adjacent to the seismogenic East Anatolian Fault, which has generated earthquakes of magnitude 7. This study re-evaluates water-level changes and earthquake shaking that have affected the Kurk Delta, combinin...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
D. R. Fuhrman, B. E. Larsen, C. Baykal, and B. M. Sumer, “Tsunami induced scour around a monopile foundation,” presented at the 35th International Conference on Coastal Engineering, 17 - 20 Kasım 2016, Antalya, Türkiye, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/86278.