三峡水库泥沙絮凝可能性分析

Study on sediment physicochemical properties and the possibility of flocculation in the Three Gorges Reservoir

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 problem after reservoir operation. Flocculation is one of the main factors affecting sedimentation. It is significant meaningful to study on flocculation in the Three Gorges Reservoir for rational planning of reservoir operation scheduling. The essay analyzed the possibility of sediment flocculation by fuzzy analysis method,on the basis of test data and research results of the Three Gorges Reservoir,including sediment particle size,temperature,electrolyte and flow velocity. The results showed that the indicators are within range of the critical flocculation or conducive to flocculation and fuzzy evaluation demonstrates that sediment flocculation is more likely exist in Three Gorges Reservoir. The result of measured data validation is the existence of the Three Gorges Reservoir larger floc particle size and it further confirmed the existence of the Three Gorges Reservoir flocculation.