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由瓯江及飞云江的水文实测资料分析入手,注意到垂线平均瞬时含沙量变化滞后于垂线平均流速变化的普遍现象,并对影响垂线平均瞬时含沙量变化的可能因素进行了分析.首次对流向及流向变化率与垂线平均瞬时含沙量的响应进行定量讨论,最终认为流向变化率、水深及底沙、悬沙中值粒径为影响垂线平均瞬时含沙量变化滞后现象的主要因素.采用较直观的方式对挟沙力公式进行了改进,以公式结构的不同复杂程度构造了不同的计算垂线平均瞬时含沙量的公式,经过与实测资料的比较,对各计算公式进行了分析与评价.
Based on the hydrological data from Oujiang River and Feiyun River, we noticed the common phenomenon that the variation of average instantaneous sediment concentration in the vertical line lags behind the average vertical velocity of the vertical line, and the possible factors that affect the average instantaneous sediment concentration change In the first analysis, the change of flow direction and flow rate and the average instantaneous sediment concentration in vertical direction were quantitatively discussed, and the change rate of flow direction, water depth and bottom sediment, suspended sediment median particle size The main factor to change the hysteresis.An intuitive way to improve the sediment carrying capacity formula to formulate different structural complexity of the formula for calculating the average instantaneous sediment concentration of the vertical formula.Compared with the measured data, The calculation formulas are analyzed and evaluated.