Academic Building (B3)-Room 116
Department of Civil and Environmental Technology
Faculty of Technology
University of Sri Jayewardenepura
Mahenwatte, Pitipana North
Homagama 10200
Sri Lanka

Email: himanujahn@sjp.ac.lk

Research Keywords: Hydrological Modeling, Seismic Analysis, Water Quality Management, Groundwater Contaminant Transport, Urban Drainage Modelling, Climate Change Adaptation, Circular Economy in Waste Management, GIS and RS Applications, Soil Mechanics, Ground Improvement Methods, Geoenvironmental Engineering

Hydrological Modeling in Ungauged Basins, Seismic Analysis and Design of Structures, Ground Improvement Techniques, Water Quality Modeling and Management, Urban Drainage Modeling, Groundwater and Contaminant Transport Modeling, Climate Change and Environmental Sustainability, Solid Waste Management and Circular Economy, GIS and Remote Sensing Applications in Hydrology, Geoenvironmental Engineering

Premachandra, B.P.S.A., Himanujahn, S., Fonseka, W.A.K.S., Athapattu, B.C.L. 2024. Investigating Substrate Amendments of Extensive Green Roofs for Water-Sensitive Urban Design. In: Dissanayake, R., et al. Proceedings of the 14th International Conference on Sustainable Built Environment. ICSBE 2023. Lecture Notes in Civil Engineering, vol 517. Springer, Singapore. https://doi.org/10.1007/978-981-97-3737-6_3

Athapattu B.C.L., Himanujahn S., Muhandiram G.M.H.M., Sandanayake S., Perera W.L.G.D., Bandara W.D.C., Edirisinghe E.A.N.V., Maeda M. and Vithanage M., 2024. Irrigation impact on water quality and aquifer vulnerability in Kala Oya basin, Sri Lanka. Groundwater for Sustainable Development, p.101127. doi.org/10.1016/j.gsd.2024.101127

Dharmarathna, D., Galagedara, R., Himanujahn, S., Karunaratne, S. and Athapattu, B., 2024. Assessment of pollution state of Beira Lake in Sri Lanka using water quality index, trophic status, and principal component analysis. Aquatic Ecology, 58(2), pp.159-174. https://doi.org/10.1007/s10452-023-10052-8

Weerabansaga M.Z., Himanujahn S., Iresh A.D.S., Athapattu B.C.L., 2023, Flood Frequency Analysis of Upper Kalu River Basin at Ratnapura, Sri Lanka. 2023, Moratuwa Engineering Research Conference (MERCon), Moratuwa, Sri Lanka, pp. 403-408, doi: 10.1109/MERCon60487.2023.10355531.

Dissanayaka D. M. O. N, Pinsarani W. G. J. R, Himanujahn S and Athapattu B. C. L, 2022, Assessing the impact of eutrophication and hourly discharge on dissolved oxygen fluctuation of urban water system linked to an estuary, Journal of Engineering and Technology 10(1), pp 40-51

Himanujahn, S., Fonseka, W.A.K.S. & Athapattu, B.C.L. (2024). An Overview of Plastic Waste on the Roadmap Towards Net Carbon Zero 2050 Sri Lanka. Proceedings of the 1st International Conference on Plastics & Environmental Sustainability

Himanujahn, S., Andradi, D.M.A.M.S.R., Fonseka, W.A.K.S., Wasalamuni, W.M.S.P.N. & Athapattu, B.C.L. (2024). Optimizing Water Circulation in “Fishbone” Canal Systems to Overcome Salinity Challenges of Mangrove Restoration in Muthupanthiya, Sri Lanka. Proceedings of the 2nd International Conference on Mangroves

Fonseka W.A.K.S, Attanayaka N.N.N, Ilangakoon I.A.S.R, Himanujahn S, Vithanage. M, Athapattu B.C.L, 2023, Mitigation of Hypereutrophic Status in Beira Lake with Coconut Shell Biochar, National Science & Technology Commission 11th Young Scientists Forum

Himanujahn S., Rathnayake R.M.L.S., Perera K.A.R.S. Athapattu B.C.L., 2023. A Conceptual engineering solution for successful management and restoration of Mangrove Forests on the West Coast of Sri Lanka. Proceedings of the 1st International Conference on Mangroves, pp 27-28

Himanujahn S., Fonseka W.A.K.S., Athapattu B.C.L., 2023, Predicting Methane Emissions of Open Dumps in Sri Lanka for Carbon Neutrality in 2050. Proceeding of the Open University Research Sessions, pp 77

Fonseka W.A.K.S., Himanujahn S., Dissanayake H.H., Athapattu B.C.L., 2023, A study on industrial pollutants discharged into the downstream of the Kelani River. Proceeding of the Open University Research Sessions, pp 76

Andradi D.M.A.M.S.R., Himanujahn S., Perera R.A.K.K., Athapattu B.C.L., 2023. Mitigating Urban Heat Island using Cool Pavement strategy: A Case Study in Colombo, Sri Lanka. In Proceedings of the 14th International Conference on Sustainable Built Environment, pp 34

Himanujahn S., Fonseka W.A.K.S., Kaushalya D.H.P., De Silva M.B.T.D., Perera R.A.K.K., Vithanage M., Athapattu B.C.L., 2023. GHG Emission less Open Dumpsite: A Circular Economy approach. In Proceedings of the 14th International Conference on Sustainable Built Environment, pp 258

Bandara N.H.M.S., Himanujahn S., Fonseka W.A.K.S., Athapattu B.C.L., 2023. Assessing the Structural Strength of Fabricated Burnt Clay Eco-Bricks with Rice Husk Ash and Alum Sludge. In Proceedings of the 14th International Conference on Sustainable Built Environment, pp 179

Navaratne R, Himanujahn S, Athapattu B.C.L, 2023, Variation of Particulate Matter in Different Seasonal Conditions in Colombo City, 79th Annual Sessions of the Sri Lanka Association for the Advancement of Science, pp 32

Arachchi C.M.E, Himanujahn S, Athapattu B.C.L, 2023, Optimization of coagulation and flocculation process of palm oil mill effluent using natural coagulant and flocculent, 79th Annual Sessions of the Sri Lanka Association for the Advancement of Science, pp 33

Himanujahn S, Senadheera D.A.N.N, Edirisinghe E. A. N. V, Vithanage M, Athapattu B.C.L, 2022, Assessment of Groundwater Vulnerability by DRASTIC-LU, Kala Oya Basin, Sri Lanka, 78th Annual Sessions of the Sri Lanka Association for the Advancement of Science, pp 27

Attanayaka N.N.N, Fonseka W.A.K.S, Ilangakon I.A.R.S, Himanujahn S, Vithanage M, Athapattu B.C.L, 2022, Remedial techniques to mitigate hypereutrophic status in Beira Lake, 78th Annual Sessions of the Sri Lanka Association for the Advancement of Science, pp 26

Himanujahn S, Diasanayaka D.M.O.N, Rajakumara R.H.M.C.R, Perera T.R, Wijerathna N.S, Karunarathane S, Athapattu B.C.L, 2021, Investigation on sediment nutrients in the Beira Lake for eutrophication, 8th International Symposium on Advances in Civil and Environmental Engineering Practices for Sustainable Development, pp 450-457

Himanujahn S, Senadheera D.A.N.N, Vithanage M, Athapattu B.C.L, 2021, Groundwater Susceptibility Assessment of Kala Oya Basin, Sri Lanka, 77th Annual Sessions of the Sri Lanka Association for the Advancement of Science, pp 30

Himanujahn, S., Fonseka, W.A.K.S., Athapattu, B.C.L. and Vithanage, M., 2025. Biochar in Subsurface Wastewater Infiltration Systems and in Constructed Wetlands. In Biochar Amendments for Environmental Remediation (pp. 238-256). CRC Press. https://doi.org/10.1201/9781003344803

Himanujahn S, (2023) ‘Alternative energies: Solar Energy’, in I am EcoSmart Unleashing Young Eco-Heroes: A Day of Adventure and Learning for Kids! 1st edn. Colombo, Sri Lanka: The Open University of Sri Lanka, pp. 43–54.