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Current Affiliation Organization 【 display / non-display 】

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Affiliated academic organizations 【 display / non-display 】

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Research Theme 【 display / non-display 】

• Red soil Runoff

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• Pedotransfer functions to estimate hydraulic properties of tropical Sri Lankan soils

  Gunarathna M.

  Soil and Tillage Research ( Soil and Tillage Research )  190   109 - 119   2019.07

  Type of publication: Research paper (scientific journal)

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• Sensitivity analysis of plant- And cultivar-specific parameters of APSIM-SUGAr model: Variation between climates and management conditions

  Gunarathna M.

  Agronomy ( Agronomy )  9 ( 5 )   2019.05

  Type of publication: Research paper (scientific journal)

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• Optimized subsurface irrigation system: The future of sugarcane irrigation

  Gunarathna M.

  Water (Switzerland) ( Water (Switzerland) )  10 ( 3 )   2018.03

  Type of publication: Research paper (scientific journal)

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• Optimized subsurface irrigation system (OPSIS): Beyond Traditional Subsurface Irrigation

  M. H. J. P. Gunarathna,Kazuhito Sakai,Tamotsu Nakandakari,Tsuneo Onodera,Hiroyuki Kaneshiro,Hiroshi Uehara,Kousuke Wakasugi

  Water ( MDPI )  9 ( 8 ) 599   2017.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• サトウキビ畑における土壌物理性および地下浸透量の推定に土壌サンプリング時期の違いが及ぼす影響

  岡本 健, 酒井 一人, 仲村渠 将, 後藤 慎古

  Journal of Rainwater Catchment Systems ( 日本雨水資源化システム学会 )  23 ( 1 ) 43 - 50   2017

  Type of publication: Research paper (scientific journal)

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  <p>  On the small islands of Okinawa, reliance on groundwater is high. The main land use in areas of groundwater recharge is sugarcane fields. To model groundwater recharge in these fields, it is important to analyze infiltration, so the appropriate choice of soil hydraulic parameters is important. Sugarcane crops can take up to 2 years to mature, so the effects of time on soil physical parameters and groundwater recharge need to be considered. To model groundwater recharge, we collected 49 soil core samples 4 times in 2½ years in 7 fields and measured soil physical parameters. Using cluster analysis, we classified the data and groundwater recharge, which was simulated in Hydrus-1D software. Values of bulk density, saturated hydraulic conductivity, and soil hydraulic parameter <i>n</i> were related to time after planting. Cluster analysis identified 4 clusters according to groundwater recharge rate and soil physical condition, and the results were affected by the time of sampling. These results indicate that it is necessary to take sampling date into account while simulating groundwater recharge in sugarcane fields. </p>

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Presentations 【 display / non-display 】

• N2O emissions from a sugarcane field for spring planting in Okinawa

  Bellido Jose, Sakai Kazuhito, Nakamura S, Kazuro M, Okamoto Ken, Nakandakari T

  第22回日本雨水資源化システム学会研究発表会  (福井市)  2014.11  -  2014.11 

• Analysis of Sediment Yield under Different Sugarcane Cultivation Systems in Urajigawa Watershed Area in Kume Island, Okinawa

  W. H. A. Shantha, Kensuke Okada, Kazuhito Sakai, Tamotsu Nakandakari

  2012 JSIDRE Annual Conference  (札幌市)  2012.09  -  2012.09 

• Identification of Factors Affecting Sugarcane Farmers' Decision on Adoption of Soil Conservation Measures in Okinawa

  W. H. A. Shantha, Kazuhito Sakai, Anshun Yoshinaga, Tamotsu Nakandakari

  2010 JSIDRE Annual Conference  (神戸市)  2010.08  -  2010.09 

• The Effects of Sedimentation Tank to Prevent Suspended Soil Runoff

  Tamotsu Nakandakari, Anshun Yoshinaga, Kazuhito Sakai, Kazutoshi Osawa

  2006 ASABE Annual International Meeting  2006.07  -  2006.07 

Academic Awards 【 display / non-display 】

Academic Awards 【 display / non-display 】

• JRCSA Young Scientists Award

  2013.11   Japan Rainwater Catchment Systems Association  

  　View Summary

  Suspended Soil and Nutrients Trap in Sedimentation Tanks Constructed for Preserving Water Environment in Okinawa

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2019.04  -  2022.03 

• Grant-in-Aid for Young Scientists(B)

  Project Year: 2011  -  2013 

  Direct: 3,500,000 (YEN)  Overheads: 1,050,000 (YEN)  Total: 4,550,000 (YEN)