The Asia Oceania Geosciences Society, or AOGS for short, is an international society established since 2003; formed by likeminded individuals to promote geophysical science and public benefits for Asia and Oceania.http://www.asiaoceania.org/aogs2009/index.asp.
Nonlinear Dynamics of the Coastal Zone session in Ocean Science section will be organized by dr. Ira Didenkulova, prof. Efim Pelinovsky (Institute of Applied Phsics, Russian Federation) and Prof. Narcisse Zahibo (University of Antilles Guyane, Guadeloupe) http://www.asiaoceania.org/aogs2009/mars/confSessionView.asp?sID=52
Measurements of properties and runup of ship-induced waves.
The wave engineering team organised a series of field works, targeted to measurements of properties of ship wakes in Tallinn Bay and runup features of ship-induced long waves. A preliminary series of measurements, with a total duration of 4 weeks, took place at the eastern breakwater of Lennusadam, about 2 km from Linnahall and 3 km from the passenger harbour. The water surface time series was sampled at a frequency of 5 Hz with the use of a downward-looking echsounder. The main part of the field works were performed near and at the island of Aegna in the period 21 June – 20 July. The studies comprised measurements of runup heights, recording of beach profile changes, identification of ship’s type, speed and distance to the study site, visual observations of the overall appearance of the ship wave systems, video recordings of the runup details, GPS-recordings of several tracks of fast ferries, numerical modelling of ship wake patters for realistic ship tracks, and studies of wave-induced changes of the optical properties of sea water.
The entire team, including PhD students at the Department of Mechanics Andrus Räämet and Andres Kask, and several guests (prof. Kevin Parnell, dr. Heiko Herrmann, prof. Efim Pelinovsky, dr. Tony Dolphin, dr. Ants Erm, among others) took part in the planning and practical organisation of the experiment, performing field measurements (which involved about 60 person-days spent at site), analysis of the data and writing of reports. The first publication – an overview of the performed studies and the basic conclusions about the properties of ship wakes and their impact on the coast – is now published in Parnell, K., Delpeche, N., Didenkulova, I., Dolphin, T., Erm, A., Kask, A., Kelpšaite, L., Kurennoy, D., Quak, E., Räämet, A., Soomere, T., Terentjeva, A., Torsvik, T., and Zaitseva-Pärnaste, I.; Far-field vessel wakes in Tallinn Bay, Estonian Journal of Engineering, 14, 4, 273–302, 2008.
Detailed comparison of numerical simulations and experimental data and analysis of variability in spatial patterns of long nonlinear waves from fast ferries is presented in the paper by Tomas Torsvik, Ira Didenkulova, Tarmo Soomere and Kevin Parnell. Variability in spatial patterns of long nonlinear waves from fast ferries.