Numerical Study on the Process of Sedimentation in Joumine Reservoir, Tunisia

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  • ISHIKAWA Tadaharu
    東京工業大学　大学院総合理工学研究科　環境理工学創造専攻
  • WANG Mingyang
    東京工業大学　大学院総合理工学研究科　環境理工学創造専攻
  • IRIE Mitsuteru
    筑波大学　生命環境系
  • NAKAMURA Takashi
    東京工業大学　大学院総合理工学研究科　環境理工学創造専攻

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Other Title
  • チュニジア国Joumine貯水池の土砂堆積過程に関する研究
  • チュニジアコク Joumine チョスイチ ノ ドシャ タイセキ カテイ ニ カンスル ケンキュウ

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Sedimentation process in the Joumine Reservoir located in the semi-arid area of North Tunisia was studied by numerical simulation. The major sediment component flowing into the reservoir is fine silt of about 5 μm in diameter, and the high SS water carried by floods generates high-turbid current along the reservoir bed. A vertical 2-D flow model was developed to simulate the high-turbid flow, and the model performance was verified by comparison with the data obtained from field measurements. The model reproduced the longitudinal profile of bed deformation for 23 years after the dam construction fairly well. The computation showed the unsteady sedimentation process, in which the small and middle scale floods result in sediment deposition in the upstream reach while the self-accelerating gravity current caused by the large scale floods picks up and transports the sediment downstream to the deepest area near the dam body.

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