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FLOW STRUCTURES DETERMINING RIVER LEVEL IN AN ESTUARY

Research Project

Project/Area Number 13450199
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionHokkaido University

Principal Investigator

YOSHIDA Shizuo  Hokkaido Univ., Grad. School of Eng., Asso. Prof., 大学院・工学研究科, 助教授 (30001324)

Co-Investigator(Kenkyū-buntansha) NISHIDA Shuzo  Osaka Univ., Grad. School of Eng., Asso. Prof., 大学院・工学研究科, 助教授 (40172663)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 2003: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥4,700,000 (Direct Cost: ¥4,700,000)
KeywordsESUTURY / WATER LEVEL / WIND STRESS / TIDE / RIVER DISCHARGE / ATMOSPHERIC PRESSURE / SALT WEDDGE / H-Q CURVE / エスチャリー / エスチュアリ / 二層密度流 / 感潮河川 / 吹き寄せ / 気圧 / H-Q式 / 水位-流量曲線 / 感潮域 / セットアップ / 河口流 / 非定常流
Research Abstract

It is essential to find the correct relationship between flow rate and river level in order to have information about the flow rate during flood and about uses of the river water like agriculture and hydroelectric generation. Normally, the river flow rate is assumed to be given by the level through the empirical H-Q equation, where H is the water level (height) and Q is the flowrate, but during drought, it becomes extremely more difficult to apply this expression to the estuary than to locations upstream. This is because the river level can take a large range of values under the influence of the four key factors of tide, atmospheric pressure, wind direction and wind speed. In this study, it was attempted to derive a method for quantitative estimation of the effects of tide, atmospheric pressure, wind direction and wind speed on flowrate in the estuary of the Ishikari River, where these four factors dramatically lower the correlation between water level (H) and river flowrate (Q). It was found that the effect of tide and atmospheric pressure on sea level is almost exactly reflected in the fluctuations of river level. Data from observations of river level under windless conditions and steady river flowrate allowed application of empirical rules for river rise due purely to flowrate, providing a quantitative estimate of the relation between wind and river behavior. Next, the flowrate was estimated at a certain location using the obtained quantitative relation between the four factors and river level, and this was found to be nearly identical to the observed flowrate. This confirmed the practical validity of this study.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 横尾啓介, 吉田静男, 西田修三, 荒川範彦: "感潮域における河川水位決定要因の定量的評価"水工学論文集. 47. 961-966 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 吉田静男, 西田修三, 横尾啓介, 中道陽文: "石狩川の密度成層構造と地形,気象,海象-IX"福田水文センター. 348 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Yoshida, K.Yokoo, C.P.CaulfieLd, P.F.Linden: "River Basin Management II"WIT Press. 491 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 吉田静男, 西田修三, 横尾啓介, 中道陽文: "石狩川の密度成層構造と地形,気象,海象-X"福田水文センター. 397 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 吉田静男, 西田修三, 横尾啓介: "石狩川の密度成層構造と地形,気象,海象-XI"福田水文センター(印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Yoshida, K.Yokoo, C.P.Caulfield, P.F.Linden: "Quantitative Assessment of the Most Decisive Factors Determining River Level in an Estuary"River Basin Management II (WIT Press). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Yoshida, K.Yokoo, S.Nishida, N.Arai: "Quantitative assessment Of the most decisive factors determining river level in an estuary (in Japanese)"Annual Journal of Hydraulic Engineering, JSCE. Vol.47. 961-996 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Yoshida, K.Yokoo, S.Nishida, Y.Nakamichi: "Fukuda Suimon Corp."Stratified Flow Strictures Affected by Topology, Weather and Sea Condition at the Mouth of Ishikari River-IX (in Japanese). 348 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Yoshida, K.Yokoo, S.Nishida, Y.Nakamichi: "Fukuda Suimon Corp."Stratified Flow Strictures Affected by Topology, Weather and Sea Condition at the Mouth of Ishikari River-X (in Japanese). 348 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Yoshida, K.Yokoo, S.Nishida: "Fukuda Suimon Corp."Stratified Flow Strictures Affected by Topology, Weather and Sea Condition at the Mouth of Ishikari River-XI (in Japanese)(in print).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 横尾啓介, 吉田静男, 西田修三, 荒川範彦: "感潮域における河川水位決定要因の定量的評価"水工学論文集. 47. 961-966 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田静男, 西田修三, 横尾啓介, 中道陽文: "石狩川の密度成層構造と地形,気象,海象-IX"福田水文センター. 348 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Yoshida, K.Yokoo, C.P.Caulfield, P.F.Linden: "River Basin Management II"WIT Press. 491 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田静男, 西田修三, 横尾啓介, 中道陽文: "石狩川の密度成層構造と地形,気象,海象-X"福田水文センター. 397 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田静男, 酉田修三, 横尾啓介: "石狩川の密度成層構造と地形,気象,海象-XI"福田水文センター(印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 横尾啓介, 吉田静男, 西田修三, 荒川範彦: "感潮域における河川水位決定要因の定量的評価"水工学論文集. 47. 961-966 (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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