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

2014 Fiscal Year Final Research Report

• 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
• Keywords: GPS可降水量 / 蒸発散量 / 移流モデル

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.

Free Research Field

水文学