Prof. N.P. Ratnayake

Harshika Imanjali Rathnayaka, Nadun Ansanayaka, Constantine Pragash, Maheshwari Gangawo Wickrama, Nilupul Senarathne, Nalin Ratnayake,".Assessing the Applicability of Sub-Bottom Profiling Towards Identification of the Bedrock Level-A Case Study in Colombo Harbor, Sri Lanka.",2023 Moratuwa Engineering Research Conference (MERCon),Colombo,2023,414-419

Pubudi Dilshara, Sandun Senarath, Nalin Ratnayake, B Abeysinghe, Ranjith Premasiri, Nimila Dushyantha, Amila Ratnayake, Nadeera Batapola,".Assessment of Ni phytomining potential in Ginigalpelessa serpentinite deposit, Southeast Sri Lanka.",2023 Moratuwa Engineering Research Conference (MERCon),Colombo,2023,31-35

Nadeera Batapola, Nalin Ratnayake, B Abeysinghe, Ranjith Premasiri, Sudath Rohitha, Nimila Dushyantha, IM Saman K Ilankoon, Oscar Dissanayake, Pannipitye Dharmaratne,".Rare earth element enrichment in intrusive rocks of Sri Lanka as a potential low-grade source.",2022 Moratuwa Engineering Research Conference (MERCon),Sri Lanka,2022,1-6

1. Batapola, N.M. Ratnayake, N.P. Premasiri, H.M.R. Abeysinghe, A.M.K.B. Dushyantha, N.P. Rohitha, L.P.S. Ilankoon, I.M.S.K. Dissanayake, D.M.D.O.K. Dharmaratne, P.G.R. Dilshara, R.M.P. ,".Prospecting Rare Earth Element Potential in Intrusive Rocks of Sri Lanka.",The 38th Technical Session of Geological Society of Sri Lanka (GSSL 2022),,Colombo,2022,

Batapola, N., Dushyantha, N., Ratnayake, N., Premasiri, R., Abeysinghe, B., Dissanayake, O., Rohitha, S., Ilankoon, S. and Dharmaratne, ,".Rare earth element potential in the beach placers along the southwest coast of Sri Lanka. Moratuwa Engineering Research Conference (MERCon 2021), .",MERCon 2021,Online,2021,

W.A.P. Weerakoon, Neerja Jha, H.A.H. Jayasena, Harinam Joshi, Deepthi Yakandawala, Rohana Chandrajith, Nalin Rathnayake and Neha Aggarwal,".PALYNOFACIES BASED DEPOSITIONAL ENVIRONMENTS IN TABBOWA JURASSIC BEDS, SRI LANKA .",33rd Technical Session of Geological Society of Sri Lanka,Sri Lanka,2017,

Pathirage SS, Hemala PVA, Rohitha LPS, Siriwardana YPS, Ratnayake NP,".Identifying the Key Contaminants of Major Types of Vein Quartz in Badulla Area and Reduce Iron Content to Suit Manufacturing Chemically Reinforced Glass.",33rd Technical Session of Geological Society of Sri Lanka,Colombo,2017,

J.M.S.T.W. Jayasinghe, A.C. Kurukulasuriya, W.M.T.U. Jayasinghe, M.A.D.M.G. Wickrama, A.M.A.Damith M. Senadhira ,".Pore-Pressure and Fracture Pressure Gradient Prediction Model for Few Exploration Blocks in Mannar and Cauvery Basins, Sri Lanka. .",Annual Sessions of the Institution of Engineers, Sri Lanka ,Colombo,2016,235-242

15. RML Udarika, EPN Udayakumara, K Amalan, NP Ratnayake and HMR Premasiri ,".Comparison of Heavy Mineral Composition along Mahaweli River with Placer Deposits at North East Coast of Sri Lanka.",International Symposium on Agriculture and Environment,University of Ruhuna,2016,141-143

Upul Premarathne, Noriyuki Suzuki ,".A simple method to remove drilling oil in sediment cuttingsfor elemental analysis: A case study from the Mannar basin,offshore Sri lanka..",32nd Technical Sessions of Geological Society of Sri Lanka,,2016,18

W.A.P. Weerakoon, H.A.H. Jayasena, Neerja Jha, N.P. Ratnayake,R.L.R. Chandrajith, Deepthi Yakandawala, Anjum Frooqui and Neha Aggarwal,".Depositional characteristics of sediments from mires in and around Horton Plains national park, Sri lanka.",32nd Technical Sessions of Geological Society of Sri Lanka,,2016,21

,".Capacity building of earth sciences towards decrease of geo hazards in Sri Lanka.",Workshop at 3rd United Nation World Conference on Disaster Risk Reduction at Sendai, Japan,Tokyo, Japan,2016,7-Jun

48. Pathirage S.S., Hemalal P.V.A., Rohitha L.P.S., Siriwardana S.,,".Producing Raw Silica from Sri Lankan Vein Quartz Suitable for High End Glass Industry.",32nd Technical Sessions of Geological Society of Sri Lanka,Sri Lanka,2015,31

AS Ratnayake, TDU Wijewardhana, T Haraguchi, K Goto, NP Ratnayake, H Tetsuka, Y Yokoyama, Y Miyairi, AMANB Attanayake,".Sedimentological observations and geochemical characteristics of paleo-tsunami deposits along the east coast of Sri Lanka in the Indian Ocean.",Quaternary International,,2023

Dushyantha, N., Ratnayake, N., Premasiri, R., Batapola, N., Panagoda, H., Jayawardena, C., ... & Dilshara, P.,".Geochemical exploration for prospecting new rare earth elements (REEs) sources: REE potential in lake sediments around Eppawala Phosphate Deposit, Sri Lanka.",Journal of Asian Earth Sciences,243,2023

RMRM Jayathilaka, NP Ratnayake, TMN Wijayaratna, KBA Silva, K Arulananthan,".A Review of coastal erosion mitigation measures on Sri Lanka's Western Coast, an Island Nation in the Indian Ocean: Current gaps and future directions.",Ocean & Coastal Management,242,2023

Nanayakkara, C. J., Dushyantha, N. P., Ratnayake, N. P., Premasiri, H. M. R., Abeysinghe, A. M. K. B., Batapola, N. M., ... & Kumarapperuma, M. Y.,". Risk evaluation and remedial measures for heavy metal contamination in lagoonal sediments of the Negombo Lagoon, Sri Lanka after the X-Press Pearl maritime disaster.",Regional Studies in Marine Science,,67,2023

Kusala Madhushani Premaratne, Rohana Chandrajith, Nalin P Ratnayake, Si-Liang Li, Kasun Gayantha, Joyanto Routh,".North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka.",The Holocene,online first,2023

Dilshara, P., Abeysinghe, B., Premasiri, R., Dushyantha, N., Ratnayake, N., Senarath, S., ... & Batapola, N.,". The role of nickel (Ni) as a critical metal in clean energy transition: applications, global distribution and occurrences, production-demand and phytomining.",Journal of Asian Earth Sciences,105912.,2023

Batapola, N., Ratnayake, N., Abeysinghe, B., Premasiri, R., Dushyantha, N., Ilankoon, I. S. K., ... & Dilshara, P. ,".The potential of REEs in the Eppawala Phosphate Deposit, Sri Lanka: REE enrichment, mineralization, and economic significance. Environmental Earth Sciences.",Environmental Earth Sciences,82(19),2023

Gunasinghage Prasadh Gunasinghe, Nalin Prasanna Ratnayake, Amila Sandaruwan Ratnayake, GVI Samaradivakara, Nimila Praneeth Dushyantha, Ravindra Jayaratne, Kodithuwakka Arachchige Dinusha, Akalanka Silva,".Monsoon-Driven Geomorphological Changes Along the West Coast of Sri Lanka: A Combined Approach Utilizing ‘CoastSat’and Google Earth Engine.",Ocean Science Journal,,2022

IMSK Ilankoon, NP Dushyantha, N Mancheri, PM Edirisinghe, SJ Neethling, NP Ratnayake, LPS Rohitha, DMDOK Dissanayake, HMR Premasiri, AMKB Abeysinghe, PGR Dharmaratne, NM Batapola,".Constraints to rare earth elements supply diversification: Evidence from an industry survey.",Journal of Cleaner Production,331,2022

Dushyantha, N., Ilankoon, I. S. K., Ratnayake, N. P., Premasiri, H. M. R., Dharmaratne, P. G. R., Abeysinghe, A. M. K. B., ... & Batapola, N. M.,".Recovery Potential of Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management..",Minerals,12(11),2022

NP Dushyantha, NP Ratnayake, HMR Premasiri, IMSK Ilankoon, PVA Hemalal, CL Jayawardena, Rohana Chandrajith, LPS Rohitha, AMKB Abeysinghe, DMDOK Dissanayake, PGR Dharmaratne, AS Ratnayake, NM Batapola,".Leaching of Rare Earth Elements (REEs) from lake sediments around Eppawala phosphate deposit, Sri Lanka: A secondary source for REEs.",Hydrometallurgy,205,2021

Nadeera Batapola, Nimila Dushyantha, Nalin Ratnayake, Ranjith Premasiri, B Abeysinghe, Oscar Dissanayake, Sudath Rohitha, Saman Ilankoon, Pannipitye Dharmaratne,".Rare earth element potential in the beach placers along the southwest coast of Sri Lanka.",2021 Moratuwa Engineering Research Conference (MERCon),,2021

Nimila Dushyantha, Nalin Ratnayake, Hemalal Panagoda, Chulantha Jayawardena, Amila Sandaruwan Ratnayake,".Phosphate mineral accumulation in lake sediment to form a secondary phosphate source: A case study in lake sediment around Eppawala Phosphate Deposit (EPD) in Sri Lanka.",International Journal of Sediment Research,36 (4),2021

Panchala Weerakoon, Harinam Joshi, Neha Aggarwal, Neerja Jha, Hetti Arachchige Hemachandra Jayasena, Deepthi Yakandawala, Rohana Chandrajith, Nalin Prasanna Ratnayake, Pooja Tiwari,".Late Jurassic-Early Cretaceous palynostratigraphy and palaeoclimate in the Andigama Basin, Sri Lanka.",Journal of Asian Earth Sciences,6,2021

Nimila Dushyantha, Sarath Weerawarnakula, Ranjith Premasiri, Bandara Abeysinghe, Nalin Ratnayake, Nadeera Batapola, Meththa Ranasinghe,".Potential ecological risk assessment of heavy metals (Cr, Ni, and Co) in serpentine soil at Ginigalpelessa in Sri Lanka.",Arabian Journal of Geosciences,14(13),2021

ND Madumini Senanayake, Amila Sandaruwan Ratnayake, UM Premila Wijesinghe, Nalin Prasanna Ratnayake,".Geochemistry and sedimentology of tropical mangrove sediments along the southwest coast of Sri Lanka: Fingerprints for development history of wetlands.",Regional Studies in Marine Science,46,2021

UMP Wijesinghe, AS Ratnayake, NP Ratnayake,".Geochemistry of Negombo Lagoon sediments in Sri Lanka: implications for environmental monitoring.",Journal of the National Science Foundation of Sri Lanka,49(1),2021

P Gunasinghe, Lilani Ruhunage, NP Ratnayake, AS Ratnayake, GVI Samaradivakara, Ravindra Jayaratne,".Influence of manmade effects on geomorphology, bathymetry and coastal dynamics in a monsoon-affected river outlet in Southwest coast of Sri Lanka.",Environmental Earth Sciences,80 (7),2021

DSM Weththasinghe, NP Ratnayake, PVA Hemalal, NP Dushyantha,".Enhancing scientific and societal understanding of geohazards in Sri Lanka.",Geological Society, London, Special Publications,501(1),2021

Lakshika Palamakumbure, Amila Sandaruwan Ratnayake, HM Ranjith Premasiri, Nalin Prasanna Ratnayake, Jinadasa Katupotha, Nimila Dushyantha, Shanaka Weththasinghe, WA Panchala Weerakoon,".Sea-level inundation and risk assessment along the south and southwest coasts of Sri Lanka.",Geoenvironmental Disasters,7(1),2020

NM Batapola, NP Dushyantha, HMR Premasiri, AMKB Abeysinghe, LPS Rohitha, NP Ratnayake, DMDOK Dissanayake, IMSK Ilankoon, PGR Dharmaratne,".A comparison of global rare earth element (REE) resources and their mineralogy with REE prospects in Sri Lanka.",Journal of Asian Earth Sciences,200,2020

Nimila Dushyantha, Nadeera Batapola, IMSK Ilankoon, Sudath Rohitha, Ranjith Premasiri, Bandara Abeysinghe, Nalin Ratnayake, Kithsiri Dissanayake,".The story of rare earth elements (REEs): Occurrences, global distribution, genesis, geology, mineralogy and global production.",Ore Geology Reviews,122,2020

N.P. Dushyantha, P.V.A. Hemalal, C.L. Jayawardena, Nalin Prasanna Ratnayake,".Application of geochemical techniques for prospecting unconventional phosphate sources: A case study of the lake sediments in Eppawala area Sri Lanka. .",Journal of Geochemical Exploration,201,2019

Amila Sandaruwan Ratnayake, Yoshikazu Sampei, Nalin Prasanna Ratnayake,".Characteristics of sedimentary organic matter and vascular plants in tropical brackish Bolgoda Lake, Sri Lanka: Implications for paleoecology and chemotaxonomy.",Regional Studies in Marine Science,30,2019

Amila Sandaruwan Ratnayake, Yoshikazu Sampei, Nalin Prasanna Ratnayake,".Molecular indicators of early stage diagenesis in the tropical coastal Bolgoda Lake, Sri Lanka.",Journal of the National Science Foundation of Sri Lanka,47(1),2019

NP Ratnayake, AS Ratnayake, RM Azoor, SM Weththasinghe, IDJ Seneviratne, N Senarathne, R Premasiri, N Dushyantha,".Performance analysis of the beach nourishment and breakwater construction to control the coastal erosion at Uswetakeiyawa, Sri Lanka.",SN Appl Sci,1,2019

S.S. Pathirage, P V A Hemalal, L.P.S Rohitha, Nalin Prasanna Ratnayake,".Production of industry-specific quartz raw material using Sri Lankan vein quartz.",Environmental Earth Sciences,78 (3),2019

Yusuke Yokoyama, Shoko Hirabayashie, Kazuhisa Goto, Jun'ichi Okuno, Adam D.Sprosona, Tsuyoshi Haraguchih, Nalin Ratnayake, Yosuke Miyairia,".Holocene Indian Ocean sea level, Antarctic melting history and past Tsunami deposits inferred using sea level reconstructions from the Sri Lankan, Southeastern Indian and Maldivian coasts.",Quaternary Science Reviews,206,2019

Nalin Prasanna Ratnayake, Amila Sandaruwan Ratnayakee, Rukshan M. Azoor, Shanaka Maduranga Weththasinghe, Indunil De J. Seneviratne, Nilupul Senarathne Ranjith Premasiri1 · Nimila Dushyantha ,".Erosion processes driven by monsoon events after a beach nourishment and breakwater construction at Uswetakeiyawa beach, Sri Lanka.",SN Applied Sciences ,1(1),2019

Amalan, K., Ratnayake, A. S., Ratnayake, N. P., Weththasinghe, S. M., Dushyantha, N., Lakmali, N., & Premasiri, R.,".Influence of nearshore sediment dynamics on the distribution of heavy mineral placer deposits in Sri Lank.",Environmental Earth Sciences,77(21),2019

W.A. Panchala Weerakoon, Neha Aggarwal, Neerja Jha, H.A.H.Jayasena, Harinam Joshi, Deepthi Yakandawala, Rohana Chandrajith, K.V. Gayantha Sashika Perera, Nalin Prasanna Ratnayake,".Reconstruction of the Upper Gondwana palaeoclimates based on palynostratigraphy, palynofacies and sedimentology of the Jurassic sequences in the Tabbowa Basin, Sri Lanka.",Journal of Asian Earth Sciences ,172,2019

Ratnayake, Amila Sandaruwan, Nalin Prasanna Ratnayake, Yoshikazu Sampei, A. V. P. Vijitha, and Sanjeewani Disna Jayamali,".Seasonal and tidal influence for water quality changes in coastal Bolgoda Lake system, Sri Lanka. Journal of Coastal Conservation.",Journal of Coastal Conservation ,22(6),2019

Kananathan Amalan, Amila Sandaruwan Ratnayake, Nalin Prasanna Ratnayake, Shanaka Maduranga Weththasinghe, Nimila Dushyantha, Nalika Lakmali, Ranjith Premasiri,".Influence of nearshore sediment dynamics on the distribution of heavy mineral placer deposits in Sri Lanka.",Environmental earth sciences,77(21),2018

Nalin Prasanna Ratnayake, Amila Sandaruwan Ratnayake, PV Keegle, MAKM Mallawa Arachchi, HMR Premasiri,".An analysis of beach profile changes subsequent to the Colombo Harbor Expansion Project, Sri Lanka.",Environmental earth sciences,77(1),2018

Shanaka Maduranga Weththasinghe, Amila Sandaruwan Ratnayake, Nimila Dushyantha, Nalin Prasanna Ratnayake, GVI Samaradivakara, AVP Vijitha,".Sub-bottom features and physical properties of water of the Tangalle Bay, Sri Lanka.",Journal of the Geological Society of Sri Lanka,19(2),2018

Amila Sandaruwan Ratnayake, Yoshikazu Sampei, Nalin Prasanna Ratnayake, Barry P. Roser ,".Middle to late Holocene environmental changes in the depositional system of the tropical brackish Bolgoda Lake, coastal southwest Sri Lanka. .",Palaeogeography, Palaeoclimatology, Palaeoecology,465,2017

A.S. Ratnayake, N. Dushyantha, N. De Silva, H.P. Somasiri, N.N. Jayasekara, S.M. Weththasinghe, G.V.I. Samaradivakara, A.V.P. Vijitha, N.P. Ratnayake ,".Sediment and physicochemical characteristics in Madu-ganga estuary, southwest Sri lanka.",Journal of Geological Society of Sri Lanka,18-2,2017

N. Dushyantha, P.V.A. Hemalal, C.L. Jayawardena, A.S. Ratnayake, H.M.R. Premasiri, N.P. Ratnayake ,".Nutrient characteristics of lake sediments around Eppawala phosphate deposit, Sri lanka.",Journal of Geological Society of Sri Lanka,18-2,2017

EN Lakmali, WGA Deshapriya, KGA Jayawardene, RMP Raviranga, NP Ratnayake, HMR Premasiri, IP Senanayake,".Long term coastal erosion and shoreline positions of Sri Lanka.",Survey in Fisheries Sciences,3(2),2017

U Premarathne, N Suzuki, N Ratnayake, C Kularathne,".Burial and thermal history modelling of the Mannar Basin, offshore Sri Lanka. .",Journal of Petroleum Geology,39,2016

Upul Premarathne, Noriyuki Suzuki and N.P. Ratnayake. ,".Modelling of Hydrocarbon Generation, Migration and Accumulation in the Northern Part of Mannar Basin, Offshore Sri Lanka.",Journal of Geological Society of Sri Lanka,17,2015

Amalan, K, and Weerawarnakula, ,".Prospection sand resources at the continental shelf in offshore Galle, Sri Lanka..",Journal of Geological Society of Sri Lanka,16,2014

Puswewala UGA, Chaminda SP, Ekanayake EMTM and Jayawardene MN,".Evaluation of the potential of sea sand as an alternative to river sand for concrete production in Sri Lanka.",Journal of Geological Society of Sri Lanka,16,2014

KBA Silva, IGIK Kumar,".Chloride contamination in construction aggregates due to periodic saline water intrusion: a case study in the Kaluganga River Estuary, Sri Lanka. Environmental Earth Sciences.",Journal of Environmental Earth Sciences,69,2013

Amo, M., Suzuki, N., Shinoda, T., Ratnayake, N. P. and Takahashi, K. ,".Diagenesis and distribution of sterenes in Late Miocene to Pliocene marine siliceous rocks from Horonobe (Hokkaido, Japan).",Organic geochemistry,38(7),2007

Ratnayake, N. P., Suzuki, N., Okada, M., & Takagi, M. ,".The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years.",Chemical geology,228(4),2006

Ratnayake, N. P., Suzuki, N., & Matsubara, M. ,".Sources of long chain fatty acids in deep sea sediments from the Bering Sea and the North Pacific Ocean.",Organic geochemistry,36(4),2005

Ratnayake, N. P., Sampei, Y., Tokuoka, T., Suzuki, N., & Ishida, H. ,".Anthropogenic impacts recorded in the sediments of Lunawa, a small tropical estuary, Sri Lanka.",Environmental Geology,48(2),2005

Ratnayake, N. P. and Suzuki, N. ,".Global changes of vegetation recorded in deep-sea sediments from Subarctic Pacific Ocean during the last 250,000 years.",Ocean Monthly,,2003

Kehelpannala, K. V., and Ratnayake, N. P. ,".Evidence for post-metamorphic metasomatism of high-grade orthogneisses from Sri Lanka.",Gondwana Research,2(2),1999