INFLUENCE OF WATER CONTROL FACILITIES ON THERMAL STRATIFICATION OF OGOUCHI RESERVOIR FOR 58 YEARS

DOI Web Site 被引用文献2件 参考文献7件
  • DUKA Maurice
    Dept. of Civil and Environmental Eng., Tokyo Metropolitan University / Land and Water Resources Division, University of the Philippines Los Baños
  • YOKOYAMA Katsuhide
    Dept. of Civil and Environmental Eng., Tokyo Metropolitan University
  • SHINTANI Tetsuya
    Dept. of Civil and Environmental Eng., Tokyo Metropolitan University
  • IGUCHI Kei
    Dept. of Civil and Environmental Eng., Tokyo Metropolitan University
  • KOIZUMI Akira
    Dept. of Civil and Environmental Eng., Tokyo Metropolitan University
  • IWASAKI Hiromi
    Bureau of Waterworks, Tokyo Metropolitan Government
  • UENO Toshiaki
    Bureau of Waterworks, Tokyo Metropolitan Government
  • CHIBA Tetsuya
    Bureau of Waterworks, Tokyo Metropolitan Government

抄録

<p> Selective withdrawal (SW) systems regulate the temperature of water released downstream of dam while vertical curtains (VC) prevent phytoplanktons from the shallow upstream reaches to disperse into the main reservoir. These water control facilities can affect the reservoir’s temperature distribution. Through long term analysis of Ogouchi’s temperature data together with numerical simulation, this paper explains the variation in temperature profiles during the three distinct periods in the reservoir’s operation namely, (1) deep penstock withdrawal (DPW), (2) purely SW and (3) combined SW and VC. Schmidt’s Stability Index (SSI) and Thermocline Strength Index (TSI) were computed to define thermal stratification. DPW promotes mixing and makes the reservoir generally warmer while SW creates a strong thermocline (high TSI) and when combined with VC, increases thermal stability (high SSI). Using 3-D hydrodynamic simulation, the conditions were successfully replicated. Results showed that outflow location and facilities largely affect the temperature and velocity profiles and the mixing and transport of river water within the reservoir.</p>

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