Dr. Rajapakse R. L. H. L.

A. C. Dahanayake ,".Effects of aquifer parameters, land use change and recharge characteristics on groundwater well drying up in wet and dry zones in Sri Lanka.",EWRI-ASCE IPWE 2016: 8th International Perspective on Water Resources and the Environment American Society of Civil Engineers /Environmental and Water,Colombo, Sri Lanka,2016,15

A. C. Dahanayake ,".An assessment on recharge characteristics and its effect on on groundwater well drying up in wet and dry zones in Sri Lanka.",ACEPS-2016: International Symposium on Advances in Civil and Environmental Engineering Practices for Sustainable Development,University of Ruhuna, Sri Lanka,2016,26-30

Ms. A C Dahanayake,".Application of a Process-based, Distributed, Hydrological and Material Transport Model to Assess Water Resources and Pollute Transport in Malwathu Oya Basin, Sri Lanka.",7th International Conference on Sustainable Built Environment (ICSBE2016),Earls Regency, Kandy,2016,

Peer Reviewed/Refereed Journal Publications

Wijesekera, N.T.S. and Rajapakse, R.L.H.L. (2012). Mathematical Modelling of Watershed Wetland Crossings for Flood Mitigation and Groundwater Enhancement – Case of the Attnagalu Oya River Basin, ENGINEER - The Institution of Engineers, Sri Lanka (July, 2013).

Rajapakse, H., Inomata, H. and Fukami, K. (2010). Diffuse Source Particulate-matter Pollution Modeling in a Semi-Urbanized Agricultural Basin in Japan using Process-based WEP and an Erosion-transport Model. Water Practice & Technology © IWA Publishing 2010 (doi:10.2166/wpt.2010.051

Asaeda, T., Rajapakse, L. and Kanoh, M. (2009). Fine sediment retention as affected by annual shoot collapse: Sparganium erectum as an ecosystem engineer in a lowland stream. River Research and Applications (DOI: 10.1002/rra.1322)

Asaeda, T. & Rajapakse, L. (2008). Effects of spates of different magnitudes on a Phragmites japonica population on a sandbar of a frequently disturbed river. River Research and Applications 24: 1310-1324.Asaeda, T., Rajapakse, L. & Fujino, T. (2008).  Applications of organ-specific growth models; modeling of resource translocation and the role of emergent aquatic plants in element cycles. Ecological Modeling 215: 170-179.

Asaeda, T., Yamamuro, M., Siong, K., Rajapakse, H. and Sanderson, B. (2008). Nutrient sources for charophytes and Najas marina in Myall Lake, Australia, indicated by carbon and nitrogen stable isotope ratios. In: Managing large lakes of the world: health, integrity and risks (Ed.: Jones, Jack. Red., Faaborg, Janice, Proceedings of the 30th Congress of the International Association of Theoretical and Applied Limnology, 12-18 August 2007, Montreal, Canada). Verhandlungen IVL 30: 401-405.

Asaeda, T., Sharma, P. & Rajapakse, L. (2008). Seasonal patterns of carbohydrate translocation and synthesis of structural carbon components in Typha angustifolia. Hydrobiologia 607: 87-101.

Sanderson, B. G., Asaeda, T., Rajapakse, L. & Redden, A. M. (2008).  Mechanisms affecting biomass and distribution of charophytes and Najas marina in Myall Lake, New South Wales, Australia. Hydrobiologia 608: 99-119.

Asaeda, T., Rajapakse, L. & Sanderson, B. (2007). Morphological and reproductive acclimations to growth of two charophyte species in shallow and deep water, Aquatic Botany 86: 393-401.

Rajapakse, L., Asaeda T., Williams, D., Roberts, J., & Manatunge, J. (2006). Effects of water depth and litter accumulation on morpho-ecological adaptations of Eleocharis sphacelata. Chemistry and Ecology 22: 47-58.

Asaeda, T., Manatunge, J., Rajapakse, L. & Fujino, T. (2006). Growth dynamics and biomass allocation of Eleocharis sphacelata at different water depths: observations, modelling, and applications.  Landscape and Ecological Engineering 2: 31-39.

Asaeda, T., Rajapakse, L., Manatunge, J. & Sahara, N. (2006). The effect of summer harvesting of Phragmites australis on growth characteristics and rhizome resource storage. Hydrobiologia 553: 327-335.

Shilla, D. A., Asaeda, T., Siong K., Rajapakse L., & Manatunge, J. (2006). Phosphorus concentration in sediment, water and tissues of three submerged macrophytes in Myall Lake, Australia. Wetlands Ecology and Management 14: 549-558.

Asaeda, T., Fujino, T., Rajapakse, L., Sanderson, B. and Redden, A. (2005). Gyttja production by charophytes and its roles in the interaction with other submerged species in an oligotorphic lake. Japan Society of Civil Engineering (JSCE) Journal of Hydraulic Engineering 49: 1208-1212.



Proceedings of Local Symposia 

Rajapakse, R.L.H.L. (2013). Flood Forecasting and Management in Sri Lanka; where more pragmatic approaches and technical considerations are needed. ICHARM Special Session on Closing Gap Between Research And Practice in Water Resources and Disaster Management: SRJCR 2013, Conference on Sri Lanka - Japan Collaborative Research 2013, 29th  - 31st March, University of Peradeniya, Sri Lanka.

Mayooran S., Manarathna S.P., Gogulan N., Rajapakse R. L. H. L. (2011). An Aquifer Characteristic Analysis for Identifying Groundwater Resource Development Alternatives in the Wet Zone of Sri Lanka, Symposium on Civil Engineering Research for Industry – 2011, Department of Civil Engineering, University of Moratuwa, December 2011.



Proceedings of International Symposia

Rajapakse, H., Inomata, H., & Fukami, K. (2009). Nonpoint Source Pollution Modeling in Yata River Basin, Japan; Process-based approach for assessing excess fertilizer effects and implications for basinwide management. Proceedings of the 12th Annual Conference of the Japan Society on Water Environment (JSWE), pp. 25-26, Tokyo, Japan, 14-15 September 2009.

Hemantha Rajapakse, Hironori Inomata, Kazuhiko Fukami (2009). Diffuse-source Particulate Nitrogen and Phosphorus Pollution Modeling in Yata River Basin in Japan using Process-based WEP model coupled with a Sediment Erosion-transport Model. Proceedings of the JSHWR 2009: Annual Research Session of the Japanese Society of Hydraulics and Water Resources, pp., Kanazawa, Japan, 19-21 August.

Hemantha Rajapakse, Hironori Inomata, Kazuhiko Fukami, Iizumi Yohiko & Tsuyoshi Kinouchi (2008). “The Impact of Nitrogen and Phosphorus Fertilizer Loading on River and Subsurface Water Quality in Yata River Basin, Japan: An Integrated, Basin-wide Modeling Approach”. Proceedings of the JSHWR 2008: Annual Research Session of the Japanese Society of Hydraulics and Water Resources, pp. 58-59, Tokyo, Japan, 26-28 August.

Rajapakse, H. L. & Jayawardena, A. W. (2008). “The Role of Dams in Sri Lanka from Ancient Times to the Present”, Proceedings of the International Seminar on Role of Dams, Annual Session of the Japan Dam Engineering Centre, pp. 55-60, Tokyo, Japan, April 23, 2008.

Lalith Rajapakse, Takashi Asaeda, Takeshi Fujino & Jagath Manatunge (2005).  “Growth and survival strategies of Eleocharis sphacelata in response to different water regimes”.  Proceedings of the 5th Annual Research Session of Sri Lanka Students’ Association in Japan, pp. 18-23, Tokyo, Japan, 04th September 2005.

Lalith Rajapakse, Takashi Asaeda, Takeshi Fujino & Jagath Manatunge (2005). “Adaptations in growth and survival strategies of Eleocharis sphacelata in response to different water regimes”, Proceedings of the JSCE 2005 7th International Summer Symposium, pp. 323-326, Tokyo, Japan, 30 July 2005 (Incl. Oral presentation).

Takashi Asaeda, Takeshi Fujino, Lalith Rajapakse, Brian Sanderson & Anna Redden (2005). “The relationship between production of gyttja and Charophytes in an oligotrophic lake and the effects of depth gradient”. Proceedings of the 49th Water Engineering Conference, Kokushikan University, Tokyo, Japan, 07-15 March 2005.

Takashi Asaeda, Lalith Rajapakse, Manatunge Jagath & Takeshi Fujino, 2004. “Effects of environmental differences on the growth of emergent plants”. Proceedings of the 51st Annual Meeting of the Ecological Society of Japan (JES51), Kushihiro, Hokkaido, Japan, 25-29 August 2004.

Lalith Rajapakse, Takashi Asaeda, Jagath Manatunge & Anna Redden, 2004.  “Contribution of submerged macrophytes in the formation of gyttja and nutrient cycling in Myall Lake, NSW, Australia”.  Proceedings of the 4th Annual Research Session of Sri Lanka Students’ Association in Japan, pp. 22-28, Tokyo, Japan, 17th October 2004 (Incl. Oral presentation).

Rajapakse, L., Sato, K. & Adachi, K. (1999). "An approach based on telemeter data to mitigate land subsidence during drought seasons in Saitama basin". Proceedings of the 54th Annual Conference of Japanese Society of Civil Engineers, pp. 341-345, 22-26 Sept. 1999, Hiroshima, Japan (Incl. Oral presentation).

Rajapakse, L., Sato, K. & Adachi, K. (1999). "Groundwater control and mitigation of land subsidence during drought seasons by means of telemeter data transmission system in Saitama, Japan". Proc. of the International Symposium on Groundwater in Environmental Problems, pp. 47-50, 12-14 January 1999, Chiba University, Japan (Incl. Oral presentation).


Papers presented at International Workshops

Rajapakse, H., Inomata, H., & Fukami, K. (2009). Diffuse Source Particulate-matter Pollution Modeling in a Semi-Urbanized Agricultural Basin in Japan using Process-based WEP and an Erosion-transport Model. Proceedings of the 13th International Conference on Diffuse Pollution and Integrated Watershed Management (IWA-DIPCON 2009), pp. 194-195, Seoul, Korea, 12-15 October 2009.

Asaeda, T., Rajapakse, L. and Kanoh, M. (2009). Retention rate of fine sediments due to the annual shoot collapse; Sparganium erectum as an ecosystem engineer in a lowland stream. Proceedings of the 12th European Weed Research Society (EWRS) International Symposium on Aquatic Weeds, pp. , Jyväskylä, Finland, 24-28 August 2009.

Chavoshian, A., Miyake, K., Sugiura, T., Hai, P. T., & Rajapakse, H. (2009). Charting ICHARM’s strategy for integrated flood risk management in the Lower Mekong River Basin. Proceedings of the 7th Annual Mekong Flood Forum (AMFF-7), Bangkok, Thailand, 13-14 May 2009.

Rajapakse, H., Inomata, H., & Fukami, K. (2008). Effects of surplus fertilizer loading on stream and subsurface water quality in Yata River Basin, Japan: An integrated, basin-wide modeling approach. Proceedings of the 4th Annual Conference of the Asia Pacific Association of Hydrology and Water Resources (APHW), Beijing, China, 03-05 November 2008.

Lalith Rajapakse, Takashi Asaeda, & Takeshi Fujino (2007). “Adaptations of Eleocharis sphacelata to water regime: Modeling of growth, morpho-ecological traits and decomposition to identify management needs”, Proceedings of TAAL 2007: The 12th World Lakes Conference, Jaipur, India, 28 October-2 November 2007.

Takashi Asaeda, Lalith Rajapakse & Takeshi Fujino (2006). “Modelling of the Resource Allocation of the Above- and Belowground Biomass of Eleocharis sphacelata; Emergent Plants in Wetlands and Implications of their Surviving Strategies”, Proceedings of ICEM 2006: International Conference on Ecological Modelling, pp. , Yamaguchi, Japan, 28 August-01 September, 2006.

Asaeda, T., Sanderson, B., Redden, A. & Rajapakse, L. (2006). “Nutrient cycles and vegetation characteristics of gyttja layer in Lake Myall, Australia”, Proceedings of SWS 2006: Annual Session of Soil and Water Society, pp. , Cairns, Australia, 09-14 July, 2006.

Takashi Asaeda, Takeshi Fujino, Lalith Rajapakse (2006). “Effects of flood patterns on the growth of Phragmites japonica - Applications for flood plain management”, Proceedings of ICLEE 2006: International Conference on Ecological Restoration in East Asia 2006, International Consortium of Landscape and Ecological Engineering, pp. , Osaka, Japan, 16-18 June 2006.

Lalith Rajapakse, Takashi Asaeda, Takeshi Fujino & Jagath Manatunge (2005). “Adaptations in growth and survival strategies of Eleocharis sphacelata in response to different water regimes”, Proceedings of the JSCE 2005: 7th International Summer Symposium of the Japanese Society of Civil Engineering, pp. 323-326, Tokyo, Japan, 30 July 2005

Asaeda, T., Sanderson, B., Redden, A., Manatunge, J., Rajapakse, L. & Fujino, T. (2005). “Distribution of charophytes and other submerged macrophytes in Myall Lake, Australia, and its role in nutrient cycling”. Proceedings of the ASLO 2005: Summer Meeting of the American Society of Limnology and Oceanography, pp. , Santiago de Compostela, Spain, 19-24 June 2005.

Takashi Asaeda, Brian Sanderson, Anna Redden, Jagath Manatunge, & Lalith Rajapakse, 2004. “Distribution of Charophytes and other submerged macrophytes in Myall Lake and its role in the nutrient cycling”. Proc. of the ASPAB 2004: 19th Annual Conference of the Australian Society for Physics and Aquatic Botany, Adelaide, Australia, 5-8th December 2004.

Lalith Rajapakse, Takashi Asaeda, Jagath Manatunge, Kian Siong, Daniel Shilla, Anna Redden and Brian Sanderson, 2004. “The role of Charophytes in production and nutrient cycling in Myall Lake, NSW, Australia”. Proceedings of IRGC 2004: the 4th Symposium of the International Research Group on Charophytes on Extant and Fossil Charophytes, pp. 50, Robertson, Australia., 25-27 September 2004.

Anna Redden, Takashi Asaeda, Lalith Rajapakse, Jagath Manatunge, Brian Sanderson and Joanne Wilson (2005). “Seasonal distribution and biomass of Charophytes in Myall Lake, a large and shallow near-pristine lake in NSW, Australia”. Proceedings of IRGC 2004: the 4th Symposium of the International Research Group on Charophytes, pp. 53, Robertson, Australia. 25-27 September 2004.

Takashi Asaeda, Brian Sanderson, Anna Redden, Jagath Manatunge and Lalith Rajapakse, 2004.  “Distribution and abundance of Charophytes and other submerged macrophytes in relation to gyttja thickness and light availability”. Proceedings of IRGC 2004: the 4th Symposium of the International Research Group on Charophytes on Extant and Fossil Charophytes, pp. 11, Robertson, Australia, 25-27 Sept,  2004.

Takashi Asaeda, Lalith Rajapakse, Jagath Manatunge, 2004. “Growth and morphological adaptations of Eleocharis sphacelata to different water depths and climatic conditions”. Proceedings of INTECOL 2004: the 7th International Wetlands Conference, pp. 19, UTRECHT, The Netherlands, 25-30 July 2004.



Theses Submitted

RAJAPAKSE Hemantha Lalith, “Growth and morphological characteristics of littoral zone sedge species and their adaptations to water depth: A comparative study and implications for river restoration and ecosystem management”. A thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy at the Graduate School of Science and Engineering, Saitama University, Japan (September 2005).

Rajapakse R. L. H. L., “Groundwater Control and Mitigation of Land Subsidence During Drought Seasons by means of Telemeter Data Transmission System in Saitama, Japan”. A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering in Civil and Environmental Engineering  at the Graduate School of Science and Engineering, Saitama University, Japan (September 1999).

Rajapakse R. L. H. L., Hapuarachchi, C. L., Weerasekera, I. R. A., “Buckling of slender piles and lateral reaction of the media”. A thesis submitted in partial fulfilment of the requirements for the degree of Bachelor of Science of Engineering in Civil Engineering at University of Moratuwa, Sri Lanka (June 1996).



Other Academic Achievements

Keynote Lectures, Invited Speeches etc.

Rajapakse, R. L. H. L. (2013). Integrated surface water and groundwater modeling approach for flood mitigation and sustainable watershed management, Invited Lecture, International Forum for Mathematical Modeling Workshop on Introduction to Modeling in Water Resources, 13th March 2014, University of Colombo, Sri Lanka.

Rajapakse, R. L. H. L. (2013). Invited Speech/Resource Person for the Professional Development Training Program on Implementation, Operation & Maintenance and Evaluation of Flood Control, Drainage & Irrigation Schemes with Emphasis of Quality Control in Sri Lanka, 02-13 December 2013, AIT Training Program to Bangladesh Delegation, AIT Extension Asian Institute Of Technology, Thailand.

Rajapakse, H. L. (2009). National Water Resources Management Policy for Sustainable Economic Development in Sri Lanka; Better Late Than Never. Keynote Lecture delivered at the 9th Annual Research Session of the SLSAJ (Sri Lankan Students’ Association in Japan). SLSAJ RS/RJ 2009 at the premises of the Embassy of Sri Lanka in Japan, Tokyo, Japan. (08 November 2009, Tokyo, Japan).

Rajapakse, H. (2009). Modelling for NPS Management: Process based modelling of agricultural nonpoint-source pollution at watershed scale; Application to Yata River Basin in Japan and implications for management. Invited presentation at the International Workshop on Non-point Source Management in Rural Area and Saemangeum Watershed. DIPCON 2009 Special Workshop co-organized by Korea Rural Community Corporation and Korea INWEPF (International Network for Water and Ecosystem in Paddy Fields), Seoul, Korea, 13 October 2009.

Rajapakse, H. (2009). River Basin Management in Japan: Past, Present and Future Directions. Invited Lecture at the Special Session at the World City Water Forum (WCWF) 2009 co-organized by Asian Development Bank/Asia-Pacific Water Forum (APWF) KnowledgeHubs on Basin Water Resources & Water Quality Management at the Launch of Knowledge Hub on Water Quality Management in River Basins (K-water, Korea), Incheon, Korea, 18-21 August 2009.

Rajapakse, H. L. 2008. “The Role of Dams in Sri Lanka from Ancient Times to the Present: Historical Development and Changing Perspectives to Serve Diverse Development Needs”, Invited Lecture at the International Seminar on Role of Dams, co-organized by Japan Dam Engineering Centre, National Institute of Water Resources Engineering & Water Resources and Environmental Management Centre; held at Japan Dam Engineering Centre, Tokyo on April 23, 2008.


Others

Rajapakse R. L. H. L. (2016). Session Chair: Session on Surface Water Hydrology. 8th International Perspective on Water Resources and the Environment (IPWE) Conference at the Cinnamon Grand Hotel, January 4th ~ 6th, 2016, Colombo, Sri Lanka.

Rajapakse, H. (2009). Session Chair: Session 16-Diffuse Pollution Modelling-1. The 13th International Conference on Diffuse Pollution and Integrated Watershed Management (IWA-DIPCON 2009), Seoul, Korea, 12-15 October 2009.

Rajapakse L. (2008). Session Chair: The 08th Annual Research Session of SLSAJ (Sri Lankan Students’ Association in Japan) – RS/RJ 2008. Tokyo, Japan, 06 November 2008.

Rajapakse L. (2006). Session Co-chair: The 06th Annual Research Session of SLSAJ (Sri Lankan Students’ Association in Japan) – RS/RJ 2006. Tokyo, Japan, 30 September 2006.


Academic Journal Review and Sub-editorship

Assistant to the Subject Editor for international journals, Landscape and Ecological Engineering, Wetlands Ecology and Management, Limnology (2004-2007) 

Reviewer for the international journals aforementioned and River Research and Applications, Water Science and Technology, Hydrobiologia, Aquatic Botany, Wetlands Ecology and Management,  Limnology (2005-to date)