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Observation and estimate of net longwave radiation for improving evapotranspiration estimates

Research Project

Project/Area Number 24658198
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeSingle-year Grants
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionUtsunomiya University

Principal Investigator

HIROYUKI MATSUI  宇都宮大学, 農学部, 教授 (30292577)

Project Period (FY) 2012-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords長波放射 / 蒸発散量 / 灌漑計画 / 熱収支 / Brunt式 / 気候依存性
Research Abstract

I measured net longwave radiation on the well-irrigated grassland, reference surface, and showed the tendency of the radiation at Utsunomiya, Tochigi, JAPAN. In Addition, I examined the coefficients of net longwave radiation equation for improving the estimation accuracy of the reference evapotranspiration. As the result, I revealed the following:(1) net longwave radiation shows seasonal variation with higher radiation in winter and lower radiation in summer; (2) the well-known assumption that the daily surface temperature is equal to the daily air temperature was hard to apply throughout the year. The daily mean surface temperature of the reference surface is higher than the daily mean air temperature in summer and lower than the daily mean surface temperature in winter; (3) the coefficients of well-known net longwave radiation equations tends to be the climate dependent variables and are required to re-calibrate coefficients based on the observation data.

Report

(3 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Research-status Report
  • Research Products

    (8 results)

All 2014 2013 2012

All Journal Article (4 results) (of which Peer Reviewed: 1 results) Presentation (4 results)

  • [Journal Article] BSRNデータを用いた下向き長波放射量推定式の検証2014

    • Author(s)
      松井宏之,大澤和敏
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: 58

    • NAID

      130005070238

    • Related Report
      2013 Final Research Report
  • [Journal Article] BSRNデータを用いた下向き長波放射量推定式の検証2014

    • Author(s)
      松井宏之,大澤和敏
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: 58

    • NAID

      130005070238

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Penman式で用いられる有効長波放射量推定式の係数に関する考察2013

    • Author(s)
      松井宏之,勝元修平
    • Journal Title

      農業農村工学会論文集

      Volume: 283 Pages: 75-80

    • NAID

      10031171476

    • Related Report
      2013 Final Research Report
  • [Journal Article] 地表面温度推定値を用いた関東地方における有効長波放射量推定式の比較2013

    • Author(s)
      松井宏之,大澤和敏
    • Journal Title

      応用水文

      Volume: 25 Pages: 15-24

    • Related Report
      2013 Final Research Report 2012 Research-status Report
  • [Presentation] BSRNデータを用いた下向き長波放射量推定式の検証2014

    • Author(s)
      松井宏之,大澤和敏
    • Organizer
      土木学会水工学講演会
    • Related Report
      2013 Final Research Report
  • [Presentation] 宇都宮における有効長波放射量の観測および推定式の検討2013

    • Author(s)
      真木拓也,松井宏之
    • Organizer
      農業農村工学会全国大会
    • Related Report
      2013 Final Research Report
  • [Presentation] 地表面温度推定値を用いた関東地方における有効長波放射量推定式の比較2012

    • Author(s)
      松井宏之・大澤和敏
    • Organizer
      農業農村工学会水文水環境研究部会シンポジウム
    • Related Report
      2013 Final Research Report
  • [Presentation] 地表面温度推定値を用いた関東地方における有効長波放射量推定式の比較2012

    • Author(s)
      松井宏之,大澤和敏
    • Organizer
      農業農村工学会水文水環境研究部会シンポジウム
    • Place of Presentation
      石川県立大学
    • Related Report
      2012 Research-status Report

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Published: 2013-05-31   Modified: 2019-07-29  

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