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泥沙淤积是水库运行面临的难题,絮凝是影响泥沙淤积的主要因素之一,三峡水库絮凝研究对合理规划水库的运行调度方式具有重要意义。本文通过分析三峡水库庙河段至坝前汛期实测数据,包括泥沙粒径、水温、盐度和水流速度,结合已有泥沙絮凝影响因素的研究成果,利用模糊综合评判法分析了三峡水库泥沙絮凝的可能性并加以验证。计算结果显示指标均处在絮凝临界范围和有利于絮凝的范围内,模糊评价结果是三峡水库泥沙存在絮凝的可能性较大,实测数据验证了三峡水库庙河段至坝前汛期存在粒径较大的絮团,进一步证实了三峡水库存在泥沙絮凝现象。
Sedimentation is a difficult problem in reservoir operation. Flocculation is one of the main factors that affect sedimentation. The study on the flocculation of the Three Gorges Reservoir is of great significance to the rational planning of reservoir operation and dispatching methods. This paper analyzes the measured data of the flood season in the Three Gorges reservoir area from the Miaoxian to the dam, including the sediment particle size, water temperature, salinity and water flow velocity. Combined with the research results of the influencing factors of sediment flocculation, the paper uses the fuzzy comprehensive evaluation method to analyze the Three Gorges Reservoir Sediment flocculation possibilities and to be verified. The calculated results show that the index is within the critical range of flocculation and the range of flocculation. The fuzzy evaluation results are more likely to flocculate the sediment of the Three Gorges Reservoir. The measured data verify the existence of particle size Larger flocs further confirmed the sediment flocculation in the Three Gorges Reservoir.