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三峡水库下游河道水沙输移特性研究 被引量:12

Characteristics of Water and Sediment Transport in the Downstream Channel of Three Gorges Reservoir
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摘要 三峡水库蓄水运用改变了下泄的水沙条件,引起坝下游水沙过程及输移特性的变化。采用以旬为单位的统计时段,分析比较了三峡水库蓄水前后旬平均流量、输沙量及含沙量的变化。蓄水前后坝下游各站洪水、中水、枯水3个流量区间的出现频率变化分析表明,建库后距坝距离愈远其洪水流量区间出现频率的减小愈显著。统计分析了不同流量级下含沙量的沿程恢复程度,发现高、低水流量级下其沿程恢复程度较中水流量级高。分析了各站悬移质中值粒径和床沙级配的变化,发现床面粗化主要位于距坝较近的荆江河段,由于粗细粒径的交换作用,悬移质中值粒径在下荆江显著变粗。 The impoundment of Three Gorges Reservoir has changed the conditions of water release and sediment,and correspondingly changed the characteristics of water and sediment transport in the downstream channel.With 10-day as the unit of data statistics,the changes of average runoff,sediment discharge and sediment concentration before and after the impounding were compared and analyzed.The analysis of the occurrence probability of high,medium and low water flow intervals showed that the flood flow interval frequency decreased more significantly as the distance from the dam grew larger.The sediment recovery of different flow levels are also analyzed.It is found that the sediment recovery degree of high and low flow levels are higher than that of middle flow level.Furthermore,through analysis on the changes of D50 of suspended sediment and size distribution of bed sediment,it is demonstrated that the bed surface coarsening is located mainly in Jingjiang river reach which is near the Three Gorges Project,and the D50 of suspended sediment was remarkably coarsened in the lower Jingjiang reach due to particle size exchange.
出处 《长江科学院院报》 CSCD 北大核心 2011年第5期75-82,共8页 Journal of Changjiang River Scientific Research Institute
基金 水利部公益性行业专项(200910004)
关键词 三峡水库 流量 悬移质 含沙量 粒径变化 Three Gorges Reservoir flow suspended sediment sediment concentration size distribution
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