Estimating evapotranspiration by atmospheric water budget method using GPS precipitable water vapor

Research Project

Project/Area Number	24656295
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Hydraulic engineering
Research Institution	Kyoto University
Principal Investigator	YOROZU kazuaki 京都大学, 工学(系)研究科(研究院), 助教 (90554212)
Project Period (FY)	2012-04-01 – 2015-03-31
Project Status	Completed (Fiscal Year 2014)
Budget Amount *help	¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000) Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000) Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000) Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords	GPS可降水量 / 蒸発散量 / 移流モデル / 蒸発散推定 / 可降水量 / GPS 可降水量 / 蒸発散
Outline of Final Research Achievements	An applicability of atmospoheric water budget method using GPS precipitable water vapor was deeply examined for estimating evapotranspiration. This approach is an evapotranspiration estimation method using observation as possible. In this study, whether an advection model could describe a horizontal advection to water vapor was investigated. GPS precipitable water vapor was used with ~20km spatial interval and 3-hour time interval. It was assumed that it is possible to estimate advection vector when 100km spatial interval was applied. Moreover, estimated evapotranspiration by proposed method showed diurnal cycle. This may suggests an applicability of proposed method to estimate evapotranspiration.