长江口深水航道分流比与汊道稳定性评估

潮汐河口汊道整治工程通常引起工程所在一支汊道分流比减少,目前对这种分流比减少的河势效应缺乏量化的评估.通过窦国仁河相方程,探讨长江口深水航道整治工程开工以来北槽水、沙条件的变化与河相调整间的相关关系.结果显示:1)整治工程可产生的河相调整幅度小于实际增幅.期间,大规模的疏浚工程和区域含沙量的降低是平衡河相实际调整的两大...

Assessment of water diversion ratio and channel stability in the Yangtze estuary deep-water channel

The regulation of a bifurcated tidal estuary usually can lead to the water diversion ratio to decrease.At present,there is no quantitative assessment of the river regime effect of such diverging ratio reduction.Based on the DOU Guo-ren equation,the correlation is analyzed between the changes in water and sand conditions and river hydraulic geometry relationship of the North Passage since the implementation of the Yangtze estuary deep-water channel regulation project.The results show that:1)The theoretical adjustment range of river hydraulic geometry relation after the project is less than the actual change.The large-scale dredging and the decrease of local sediment concentration are the two important roles in balancing the actual adjustment of river hydraulic geometry relation.2)At present,the low sediment content environment of the North Passage supports the increase of the average depth in the main trough,but the volume of the main trough still needs to be stabilized by dredging.