1. Fluid Mechanics
2. Hydraulic Design
3. Hydrology
4. Hydraulic Engineering
5. Remote Sensing and GIS

1. Integrated Water Resources Management
2. Policy evaluation to tackle climate change
3. Climate change impact assessment on water systems
4. The nexus between population, water resources and climate change
5. The use of remote sensing in combination with GIS to assess and monitor land use change and components of hydrologic systems
6. River basin management and irrigation scheme management in arid/ semi arid regions
7. Risk assessment using probability models
8. Statistical methods: non-linear regression, cluster analysis

Peer Reviewed International Journal Publications

1. Sanduni Ashvini, H.G.D., Gunasekara, N.K., Fernando, W.C.D.K. and Prasanna, R.,2025. The current insurance practices employed to manage flood risk in the global built environment and their applicability to Sri Lanka, International Journal of Disaster Resilience in the Built Environment, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/IJDRBE-08-2024-0098
2. Gunasekara N.K., Al-Wardy, M.M., Al-Rawas, G.A. and Charabi, Y., 2015. Applicability of VI in arid vegetation delineation using shadow affected SPOT imagery, Environmental Monitoring and Assessment, Springer. 187: 454. https://doi.org/DOI:10.1007/s10661-015-4662-8
3. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2014. Water conflicts in countries with different degrees of adaptability to changes in water availability and its unequal distribution. Water Resource Management. 28(1), 169-184. https://doi.org/DOI:10.1007/s11269-013-0478-x
4. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2013. The effects of country-level population policy for enhancing adaptation to climate change. Hydrology and Earth System Sciences, 17, 4429-4440. https://doi.org/doi:10.5194/hess-17-4429-2013
5. Gunasekara N.K. and Kazama, S., 2011. Monitoring inequalities in irrigation supplies for sustainable irrigation management, Annual Journal of Hydraulic Engineering, Japan Society of Civil Engineers, JSCE, 55, S-115 ? S-120. https://doi.org/ DOI:10.2208/jscejhe.67.I_115
6. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2010. Inequalities in water resources distributions and water related conflicts, Annual Journal of Hydraulic Engineering, JSCE, 54, 115-120.
7. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2009. The potentially available global water resources distributions under climate change, Annual Journal of Hydraulic Engineering, JSCE, 53, 13-18.

Book Chapters

1. N. K. Gunasekara, S. Kazama, D. Yamazaki, T. Oki, Water conflict vulnerability of Mekong countries in the near future. K. Yamamoto, H. Furumai, H. Katayama, C. Chiemchaisri, U. Puetpaiboon, C. Visvanathan and H. Satoh (Eds.), Southeast Asian Water Environmnet 5, pp.205-211, 2014.1. 
2. Nilupul Gunasekara and So Kazama, Water conflict vulnerability of regions. In G. Blöschl, K. Takeuchi, S. Jain, A. Farnleitner & A. Schumann (Eds.), Risk in water resources management, IAHS Publication (Red Book) 347, pp.267-273, 2011.

Conference Proceedings

1. Ashvini, H.G.D.S., Gunasekara, N.K., Fernando, W.C.D.K. and Prasanna, R., 2023. Assessing the role of insurance companies in flood insurance coverage in Sri Lanka. Proceedings of the Disaster Risk Reduction and Management in Sri Lanka: Science, Policy and Practice (DRRMSL 2023) National Conference. Ratmalana, Sri Lanka. 25 July 2023. pp 29-30.
2. Ranasinghe, L.S., and Gunasekara, N.K., 2023. Monitoring the spread of pollutants released by the X-Press Pearl to the Indian Ocean. Proceedings of the Disaster Risk Reduction and Management in Sri Lanka: Science, Policy and Practice (DRRMSL 2023) National Conference. Ratmalana, Sri Lanka. 25 July 2023. pp 27-28.
3. Dissanayake, D.M.L.P.B. and Gunasekara, N.K., 2023. Examining the impact of land use change patterns on streamflows for flood mitigation in the lower Kelani Basin. Proceedings of the Disaster Risk Reduction and Management in Sri Lanka: Science, Policy and Practice (DRRMSL 2023) National Conference. Ratmalana, Sri Lanka. 25 July 2023. pp 76-78.
4. Gunasekara, N.K., Ashvini, H.G.D.S., Fernando, W.C.D.K., 2022. Decision Making on Flood Risk in Small Ungauged Urban Basins, Proceedings of the Information Systems for Crisis Response and Management (ISCRAM) Asia Pacific regional conference. Melbourne, Australia and Online. 7-9 November 2022.
5. Sammandapperuma, S. M. A. D. R. M., Gunasekara, N. K. and Herath, C. 2021. Employing satellite image derived water surface areas to estimate the small tank capacities in data-scarce regions. Proceedings of International Conference on Sustainable Water Resources Management (ICSWRM) – Committee on Global Environment –JSCE. Online, 10^th September 2021. pp 38-40.
6. Gunasekara, N. K. and Rashmika, T. D. S., 2021. A comparison of the quality of spatial rainfall data products available over Attanagalu Oya catchment, Sri Lanka. Proceedings of International Conference on Sustainable Water Resources Management (ICSWRM) – Committee on Global Environment –JSCE. Online, 10^th September 2021. pp 41-42.
7. Ediriweera, E. T. D. and Gunasekara N. K., 2021. Identifying Current Trends in Source Selection of Household Water Use in an Area in Kalutara. Proceedings of the 14th International Research Conference-KDU. 09-10^th September 2021. pp 107-113. 
8. Thusitha, G.A., Gunasekara, N.K., Shanaka, P.S., Sandeepa, P.D.Y., Aboobakur, S., Witharana, P.S., Bogoda, S.T., Wijeweera, K.P. and Bandara, R.M.T.B.2021. Flood Modelling and Disaster Risk Reduction in Small Catchments of Sri Lanka, Transactions of the Annual Conference of IESL-2020 Part B, Submission 57. ISBN 978-624-5810-01-7.
9. Wickramarachchi, W.C.P., Gunasekara, N.K., Fernando, W.C.D.K. and Wickramasuriya, S.S. 2019. A study of flood forecasting and mapping in Attanagalu Oya. 5^th Int. Conf.  on Science, Engineering & Environment (SEE), Bangkok, Thailand, November 11-13, 735-740. 
10. Herath H.M.K.N.M. and Gunasekara N.K., 2019. Sliding susceptibility of solid waste fills indicated by physical parameters on-site. Proceedings of the12th International Research Conference-KDU. 11-12th September 2019. p 34.
11. Jayasinghe J.A.A. and Gunasekara N.K., 2017. Cost effective Construction using alternative materials. 10th International Research Conference-KDU. 3^rd-4^th August 2017. p 60.
12. Gunasekara, N. K., Samarakoon, T.M.W.R.M.B. and Chaminda, S.P., 2016. Identifying current vulnerability hotspots of Kirindi Oya Irrigation and Settlement Project (KOISP) Sri Lanka to extreme weather events. IAHR APD 2016, Colombo Sri Lanka. 2F005_AB.
13. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2012. Effects of Population control policy as adaptation strategy to climate change. Annual Session of the Japan Society of Civil Engineers – Tohoku Branch. pp. II-16.
14. Gunasekara N.K. and Kazama,S., 2011. Water conflict vulnerability of regions. Proceedings of: Risk in water resources management. Earth on the edge: Science for a sustainable planet. XXV IUGG General Assembly. Melbourne, Australia. 267-273.
15. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2011. Water conflict vulnerability of Mekong countries in the near future. Conference proceedings of the 9^th International Symposium on Southeast Asian Water Environment. Bangkok, Thailand. 25-32. 
16. Gunasekara N.K. and Kazama, S., 2011. A country classification to identify water conflicts, Annual Session of the Japan Society of Civil Engineers – Tohoku Branch, pp. II-16.
17. Gunasekara N.K. and Kazama, S., 2010. Implications of water resources inequality for small scale irrigation scheme management. Hydrological regime and water resources in the context of climate change. 5^th Conference of Asia Pacific Association of Hydrology and Water Resources. Hanoi, Viet Nam. 352-357. 
18. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2010. Inequality in water resources and water conflicts. Proceedings of Annual conference of Japan Society of Hydrology and Water Resources. pp. 14-15.
19. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2009. Applicability of Gini Coefficient as a quantifier of potentially available water resources distributions, Annual Conference of Japan Society of Civil Engineers, pp. II-194.
20. Gunasekara N.K., Kazama, S., Yamazaki, D. and Oki, T., 2009. Potentially available water resources distributions of earth under climate change and their implications for water resources management, Conference of JSCE Tohoku branch, pp. 143~144 (II-25).

1. Graduate School of Environmental Studies Incentive Prize, Tohoku University, Japan. (2011)
2. The Japanese Government scholarship and research grant granted by the Ministry of Education, Culture, Sports, Science, and Technology (MONBUKAGAKUSHO). (2010)
3. The Social Innovation Scholarship, granted by the Akira Foundation, Japan. (2009)
4. Mitsubishi UFJ Trust Scholarship, granted by the Mitsubishi UFJ Trust Foundation, Japan. (2008)

Memberships in Professional Bodies

1. Member of the International Association for Hydrological Sciences (IAHS)
2. Member of the Sri Lanka Association for Advancement of Science (SLAAS)
3. Associate Member of the Institution of Engineers (IESL).
4. Member of Engineering Council- Sri Lanka (ECSL)