• Assistant Professor, Disaster Prevention Research Institute, Kyoto University, Japan, JSPS Postdoctoral Fellow for Research Abroad (Aug. 2007 - Aug. 2009, Oregon State University.)
  

Academic Degree

• Rainfall-runoff modeling based on the understandings of runoff generation processes
• Uncertainty and scale issues of distributed rainfall-runoff predictions
• Real-time flood forecasting and flood disasters

Publications

(2005 to present)

• Takahiro SAYAMA, Keiko TATSUMI, Yasuto TACHIKAWA, Kaoru TAKARA: Hydrograph separation based on spatiotemporal record of stream flow in a distributed rainfall-runoff model, Journal of Japan Society of Hydrology and Water Resources, Vol. 20, No. 3, pp. 214-225, 2007 (in Japanese).
  
• Takahiro SAYAMA, Yasuto TACHIKAWA, Kaoru TAKARA: Model building unit for rainfall-runoff simulation, Journal of Civil Engineering, JSCE, Vol. 63, No. 2, pp. 92 - 107, 2007 (in Japanese).
  
• Sunmin KIM, Yasuto TACHIKAWA, Takahiro SAYAMA and Kaoru TAKARA : Ensemble Flood Forecasting with Stochastic Radar Image Extrapolation and a Distributed Hydrologic Model, Hydrological Process (in review), 2007.
  
• Le Minh NHAT, Yasuto TACHIKAWA, Takahiro SAYAMA, and Kaoru TAKARA: A simple scaling charateristics of rainfall in time and space to derive intensity duration frequency relationships, Annual Journal of Hydraulic Engineering, JSCE, vol. 51, 2007.
  
• Takahiro SAYAMA, Yasuto TACHIKAWA, Kaoru TAKARA, and Yutaka ICHIKAWA: Distributed rainfall–runoff analysis in a flow regulated basin having multiple multi-purpose dams, IAHS Publication, no. 303, 2006.
  
• Takahiro SAYAMA, Hiroki KANNO, Yasuto TACHIKAWA, Kaoru TAKARA : Assessment of flood safety levels in the Yodo River basin with a rainfall-runoff prediction system incorporating dam operation models, Journal of Hydroscience and Hydraulic Engineering, 50, pp. 601-606, 2006 (in Japanese).
  
• Yasuto TACHIKAWA, Roshan SHRESTHA and Takahiro SAYAMA: Flood disaster and flood runoff modeling in Japan, Predictions in Ungauged Basins, IAHS PUB Publication, 301, pp. 78-86, 2006.
  
• Kenichiro KOBAYASHI, Yasuto TACHIKAWA, Takahiro SAYAMA, and Kaoru TAKARA, Analisis of the Yuragawa-river flood by typhoon No. 23 in October 2004 using distributed rainfall-runoff model, Annual Journal of Hydraulic Engineering, JSCE, vol. 50, pp. 313-318, 2006.
  
• Sunmin KIM, Yasuto TACHIKAWA, Takahiro SAYAMA, and Kaoru TAKARA: Ensemble rainfall-runoff prediction with radar image extrapolation and its error structure, Annual Journal of Hydraulic Engineering, JSCE, vol. 50, pp. 43-48, 2006.
  
• Takahiro SAYAMA, Yasuto TACHIKAWA, Kaoru TAKARA, and Yutaka: Development of a distributed rainfall-runoff prediction system and assessment of the flood control ability of dams, Journal of Civil Engineering, JSCE, No. 803 / II-73, pp. 13-27, 2005 (in Japanese).
  
• Takahiro SAYAMA, Yasuto TACHIKAWA, Kaoru TAKARA: Gauge-radar rainfall adjustment with incorporating estimation uncertainty by using Cokriging-type Sequential Gaussian Simulation, Journal of Civil Engineering, JSCE , No. 803 / II-73, pp. 1-11, 2005 (in Japanese).
  
• Takahiro SAYAMA, Yasuto TACHIKAWA, Kaoru TAKARA: Uncertainty evaluation of rainfall-runoff models and its application to model selection, Journal of Civil Engineering, JSCE, No. 782 / II-71, pp. 1-13, 2005 (in Japanese).
  
• Satoru OISHI, Takahiro SAYAMA, Hajime NAKAGAWA, Yoshifumi SATOFUKA, Yasunori MUTO, Dian SISINGGIH, and Kengo SUNADA: Development of estimation method for impact energy of raindrop considering raindrop size distribution and the relationship between the impact energy and local sediment yield, Annual Journal of Hydraulic Engineering, JSCE, vol. 49, pp. 1087-1092, 2005.

Personal Interests

• Photograph, Tennis (beginner level), Kendo (Japanese martial arts with bamboo sword)