Experimental observations of tsunami induced scour at onshore structures

Journal article


McGovern, D, Todd, D, Rossetto, T, Whitehouse, RJS, Monaghan, J and Gomes, E (2019). Experimental observations of tsunami induced scour at onshore structures. Coastal Engineering. 152, p. 103505.
AuthorsMcGovern, D, Todd, D, Rossetto, T, Whitehouse, RJS, Monaghan, J and Gomes, E
Abstract

Tsunami inundation of the coastal environment can induce scour at structure foundations leading to failure. A series of
experiments are made using a unique Pneumatic Long Wave Generator to generate tsunami wave periods of 25 - 147
s equating to 3 - 17.3 mins at 1:50 Froude scale. The waves propagate over a sloping bathymetry and impinge upon a
square structure founded onshore in a flat sediment bed. Flow velocity, height and scour are recorded as a function of
time during tsunami inundation. The rate of scour is observed to be time dependent. Equilibrium, which is not attained,
is argued to be an inappropriate measure for time-dependent transient flows such as tsunami in which the flow
velocity, depth and direction are variable. The maximum scour depth is recorded and critically is observed not to be
equal to the final depth due to significant sediment slumping when flow velocities reduce in the latter stages of
inundation. Current and wave scour predictor equations over predict the scour, while the ASCE 7-16 method under
predicts. Comparisons with available data in the literature show longer inundation durations increase the amount of
scour.

Year2019
JournalCoastal Engineering
Journal citation152, p. 103505
PublisherElsevier
ISSN0378-3839
Digital Object Identifier (DOI)doi:10.1016/j.coastaleng.2019.103505
Publication dates
Print20 May 2019
Publication process dates
Deposited31 May 2019
Accepted11 May 2019
Accepted author manuscript
License
CC BY-NC-ND 4.0
Permalink -

https://openresearch.lsbu.ac.uk/item/8668y

Accepted author manuscript

  • 1
    total views
  • 0
    total downloads
  • 0
    views this month
  • 0
    downloads this month

Related outputs

Experiments on Tsunami Impact with a Vertical Sea Wall
McGovern, D, Robinson, T and Rossetto, T (2016). Experiments on Tsunami Impact with a Vertical Sea Wall. 1st International Conference on Natural Hazards & Infrastructure. Chania, Greece 28 - 30 Jun 2016
Tsunami Simulators in Physical Modelling – Concept to Practical Solutions
McGovern, D (2017). Tsunami Simulators in Physical Modelling – Concept to Practical Solutions. European Geophysical Union. Vienna 23 - 27 Apr 2017 London South Bank University.
Understanding wave generation in pneumatic tsunami simulators
McGovern, D (2016). Understanding wave generation in pneumatic tsunami simulators. 6th International Conference on the Application of Physical Modelling in Coastal and Port Engineering and Science. Ottawa, Canada 10 - 13 May 2016 London South Bank University.
Experimental Study of the Runup of Tsunami Waves on a smooth Sloping Beach
McGovern, D (2016). Experimental Study of the Runup of Tsunami Waves on a smooth Sloping Beach. 6th International Conference on the Application of Physical Modelling in Coastal and Port Engineering and Science. Ottowa, Canada 10 May - 13 Jul 2016 London South Bank University.
Experimental study on kinematics of sea ice floes in regular waves
McGovern, D and Bai, W (2014). Experimental study on kinematics of sea ice floes in regular waves. Cold Regions Science and Technology. 103, pp. 15-30.
Time Development of Scour around a Cylinder in Simulated Tidal Currents
McGovern, D, Ilic, S, Folkard, AM, McLelland, SJ and Murphy, BJ (2014). Time Development of Scour around a Cylinder in Simulated Tidal Currents. Journal of Hydraulic Engineering. 140 (6), pp. 04014014-04014014.
Experimental study of wave-driven impact of sea ice floes on a circular cylinder
McGovern, D and Bai, W (2014). Experimental study of wave-driven impact of sea ice floes on a circular cylinder. Cold Regions Science and Technology. 108, pp. 36-48.
Response of small sea ice floes in regular waves: A comparison of numerical and experimental results
Bai, W, Zhang, T and McGovern, D (2016). Response of small sea ice floes in regular waves: A comparison of numerical and experimental results. Ocean Engineering. 129, pp. 495-506.
Pneumatic Long-Wave Generation of Tsunami-Length Waveforms and their Runup
McGovern, D, Robinson, T, Chandler, ID, Allsop, W and Rossetto, T (2018). Pneumatic Long-Wave Generation of Tsunami-Length Waveforms and their Runup. Coastal Engineering. 138, pp. 80-80.