Dr. R. S. Ranasinghe

Senior Lecturer (G I)

Civil Engineering
Faculty of Engineering Technology
web RG GS

Central Campus,

Office: 011-2881470, Ext: 470

Email: rsran@ou.ac.lk

Dr. Suminda Ranasinghe obtained his first degree from the University of Moratuwa, Sri Lanka with a first class honours in Civil Engineering.  He then obtained his Master’s degree and Doctorate specializing in Coastal Engineering from the University of Tokyo, Japan. Soon after the completion of his PhD, Dr. Ranasinghe joined the Department of Civil Engineering, The University of Tokyo as an Assistant Professor and then provided his services as a Lecturer at the School of Planning, Architecture & Civil Engineering, Queen’s University of Belfast, UK. After returning to Sri Lanka in 2011, he made contributions to the development of non-state sector educational institutes in Sri Lanka in partnership with University of the West of England and Heriot-Watt University, UK.

His area of specialization is Coastal Engineering and his research interests include physical and numerical modelling of nearshore hydro-morphodynamics, coastal structures, wave energy converters, climate change impact on coastal zones and image analysis techniques. Dr. Ranasinghe is an Associate Member of the Institute of Engineers Sri Lanka.

Area of Specification:

Water and Coastal Engineering

Research Intrests:

Nearshore hydro-morphodynamics, Coastal structures, Climate change impacts on coastal zone, Wave energy converters, image analysis techniques



Programmes Coordination:

DTech (Civil Engineering), BTech (Civil Engineering),

Course Coordination:

CVX3340 – Introduction to Hydraulics & Hydrology , CVX4240 – Hydraulic Engineering I, CVX5531 – Mechanics of Fluids


APAC 2009 Award (2009) for the best paper

Awarded by the Danish Hydraulic Institute and Nanyang Technological University, Singapore at the 5th International Conference on Asian and Pacific Coasts. 13-16th October.

Monbu-kagaku-sho Scholarship (2006) to pursue Doctoral degree in Civil Engineering.

Awarded by the Ministry of Education, Culture, Sports, Science and Technology, Japan.

“Furuichi” Award (2005) for the excellence in research, thesis and presentation (MEng).

Awarded by the Department of Civil Engineering, The University of Tokyo, Japan.

ADB-JSP Scholarship (2003) to pursue MEng degree in Civil Engineering.

Awarded by the Asian Development Bank.

University of Moratuwa Award (2002) for the best Civil Engineering graduand in Water and Environmental Engineering.

Awarded by the University of Moratuwa, Sri Lanka.

Westpac Award (1992) in Australian Mathematics Competition.

Awarded by The University of Canberra, Australia.


Ranasinghe, R.S. (2019) “Simulation of breaking waves over different seabed configurations using phase-resolving wave models,” (under review).

Ranasinghe, R.S.  “A comparative study of eddy viscosity type sub-models for simulating wave breaking induced energy dissipation in Boussinesq models,” (in preparation).

Ranasinghe, R.S.  “Modelling of wave induced currents in the vicinity of low crested structures using nonlinear wave models,” (in preparation).

Ranasinghe, R.S. (2018) “Numerical modelling of wave transformation over submerged breakwaters using Boussinesq-type models,” Journal of the National Science Foundation, Sri Lanka 49 (3)369-379.

Ranasinghe, R.S., Fukase, Y. Sato, S., Tajima, Y. (2011) “Local concentration of waves due to abrupt alongshore variation of nearshore bathymetry,” Coastal Engineering Journal 53 (3), 20-32.

Fukase, Y., Sato, S., Tajima, Y., Ranasinghe, R.S. (2010) “Mechanisms and countermeasures for local amplification of long-period waves due to alongshore change in nearshore bathymetry (in Japanese),” Coastal Engineering Japan, 57(2) 1282-1286.

Fukase, Y., Ranasinghe, R.S., Tajima, Y., Sato, S. (2009) “Transformation of long-period giant waves on the Shimoniikawa coast (in Japanese),” Coastal Engineering Japan, 56(2) 1411-1415.

Ranasinghe, R.S., Sato, S. (2007) “Beach morphology behind single impermeable submerged breakwater under obliquely incident waves,” Coastal Engineering Journal 49 (1), 1-24.

Koibuchi, Y., Honda, T., Welhena, T., Ranasinghe, R.S., Sato, S. (2005) “The concentration mechanism of damage to south-west coast of Sri Lanka by Indian Ocean Tsunami (in Japanese),” Coastal Engineering Japan, 52(3): 1411-1415.

Ranasinghe, R.S. (2020) “Simulating Evolution of Waves & Currents around Submerged Breakwaters,” at the 22nd IAHR-APD Congress, Sapporo, Japan (accepted for publication)

Ranasinghe, R.S., Fukase, Y., Sato, S., Tajima, Y. (2010) “Locally concentrated damage at Shimoniikawa coast, Toyama Bay, Japan due to giant swell waves,” 32nd Int. Conf. Coastal Engineering, Shanghai, China, paper no: waves. 21. Retrieved from http://journals.tdl.org/ICCE/

Ranasinghe, R.S., Sato, S., Tajima, Y. (2009) “Modelling of waves & currents around porous submerged breakwaters,” in Proc. Coastal Dynamics 2009, ASCE, Tokyo, Japan. paper no.12 (CD proceedings)

Ranasinghe, R.S., Sato, S., Tajima, Y. (2009) “Boussinesq modeling of waves and currents over submerged breakwaters,” in Proc. 5th International Conference on Asian and Pacific Coasts, Singapore, pp 58-64.

Ranasinghe, R.S., Sato, S., Tajima, Y., Muliawan, M.J. (2008) “Evolution of nearshore currents around submerged breakwaters,” in Proc. 31st Int. Conf. Coastal Engineering, ASCE, Hamburg, Germany, pp. 927-939.

Ranasinghe, R.S., Sato, S. (2007) “Longshore sand transport rate measurements using small-scale physical models,” in Proc. Coastal Sediments ’87, ASCE, New Orleans, Lousiana, USA, pp. 68-81.

Ranasinghe, R.S., Sato, S. (2006) “Beach morphology behind an impermeable submerged breakwater under obliquely incident waves,” in Proc. 30th Int. Conf. Coastal Engineering, ASCE, San Diego, USA, pp. 3682-3694.

Ongoing Research:

Development of a numerical model to simulate nearshore wave currents over porous beds.

Research Supervisions:

Development of a shoreline model based on Kamphuis (1991) formula.

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