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Analysis of Evapotranspiration Process for Working System Planning in Water Resources Conservation

Research Project

Project/Area Number 04454080
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 林学
Research InstitutionTHE UNIVERSITY OF TOKYO

Principal Investigator

SHIBANO Hirofumi (1994)  The University of Tokyo, University Forest, Lecturer, 農学部(材), 講師 (00143412)

西尾 邦彦 (1992-1993)  東京大学, 農学部(林), 教授 (60011938)

Co-Investigator(Kenkyū-buntansha) NISHIO Kunihiko  Tokyo University of Agriculture, Forestry, Professor, 農学部, 教授 (60011938)
SHUIN Yasuhiro  The University of Tokyo, Forestry, Assistant Professor, 農学部, 助手 (60221305)
SUZUKI Masakazu  The University of Tokyo, Forestry, Associate Professor, 農学部, 助教授 (10144346)
OHTA Takehiko  The University of Tokyo, Forestry, Professor, 農学部, 教授 (50134797)
芝野 博文  東京大学, 農学部(林), 講師 (00143412)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1992: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsWater Resources Conservation / Evapotranspiration / Discharge Duration Curve / Eddy Correlation Method / Growth of Forest / Trend / Experimental Watershed / 樹冠遍断蒸発 / 単木吊下法 / 林内微気象 / 超音波風速温度計 / 顕熱流束 / 乱流 / 山地
Research Abstract

In this study three methods were adopted to analyze evapotranspiration fundamentally. The first one is a study analyzing actual data with eddy correlation method to measure directly evapotranspiration, the second is a study to apply short term water balance method to daily precipitation and daily runoff, and the last is a study to analyze discharge duration curve on daily discharge rate.
1.Measurement was conducted to turbulent transport on forest crown which locate on rolling terrain in two study sites, University Forest in Aichi and Kinomoto Town in east side of Biwa Lake. Turbulent flux of momentum tau and sensible heat H which was measured by eddy correlation method were used to check goodness of fit on bulk method. The result shows that as to the correlation between u^* from tau and U,the data plots of the forest site were scattered widely, and were closely related to stability, however, the flat field data satisfied the linear correlation.
2.Attempt has been made to identify trends in a long series of discharge duration curve for describing the effect of gradual change in physical processes with forest growth using 56-year discharge records in two small experimental watersheds in the University Forest in Aichi. It was found that the 6th to 220th day discharge on the discharge duration curve linearly increased over the course of several decades in both watersheds using comparative analysis with simple regression models.
3.Short term water balance method was applied to the data of daily discharge and precipitation to get evapotranspiration. After correcting the difference caused by watershed wetness with simple model, good relationship between stand stock of forest and indication value on evapotranspiration was found in three watersheds.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] TAKANORI SHIMIZU: "Application of the eddy correlation method to estimate momentum and sensible hoat flex above a forest on rolling terraim" Prcceedings of International Symposium on Forest Hydrologh. 131-138 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] MASAKAZU SUZUKI: "Forest Influences on discharge duration carve using a 56-year daily discharge rate in two small watersheds" Proceedings of the International Symposium on Forest Hydrology. 611-617 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] TAKANORI SHIMIZU: "Application of the eddy correlation method to estimate momentum and semsible heat flax abobe a forest on rolling torrain" Proceedings of International Symposium on Forest Hydrology. 131-138 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] MASAKAZU SUZUKI: "Forest Influences on discharge duration curve using a 56-year daily discharge rate in two small watersheds" Proceedings of International Symposium on Forest Hydrology. 611-617 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] TAKANORI SHIMIZU: "Application of the eddy correlation method to estimate momentum and sensible heat flux above a ferest on relling terrain" Proceedings of International Symposium on Ferest Hydrology. 131-138 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] MASAKAZU SUZUKI: "Forest Influences on discharge duration curre using a 56 year daily discharge rate in two small watersheds" Proceedings of the International Symposium on Forest Hydrcligy. 611-617 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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