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为计算椒江河口的挟沙能力,依据近年来的水文泥沙实测资料,从“背景含沙量”概念入手,结合水流紊动作用与泥沙重力作用的对比关系,得出了适用于椒江河口的挟沙能力经验式。运用该式预测了短期内河床的冲淤趋势,并将预测结果与实测及数模计算数据进行了比较。结果表明,椒江河口背景含沙量的形成是由最大浑浊带的存在、潮波作用以及悬、底沙在径、潮流作用下频繁交换等几个因素引起;引入“背景含沙量”的挟沙能力经验式可较好地计算椒江河口的挟沙能力,可用于预测河床冲淤趋势,计算结果与实测情况基本一致。研究成果可用于椒江河口的河床冲淤估算,并为类似河口的闸下淤积预估提供了参考。
In order to calculate the sediment carrying capacity of Jiaojiang Estuary, based on the measured data of hydrological sediment in recent years, starting from the concept of “sediment concentration in the background” and combining with the contrast between the turbulent flow and sediment gravity, Jiaojiang Estuary sediment carrying capacity of experience. This equation is used to predict the tendency of riverbed erosion and sedimentation in a short period of time, and the predicted results are compared with the measured and calculated data. The results show that the sediment concentration in the background of Jiaojiang Estuary is caused by the existence of the largest turbid zone, the action of tidal waves and the frequent exchange of suspended sediment and sediment under the influence of the diameter and tidal current. The introduction of “background sediment concentration” The empirical formula of sediment carrying capacity can well calculate the sediment carrying capacity of Jiaojiang River estuary, and can be used to predict the tendency of riverbed scouring and silting. The calculation results are basically consistent with the measured data. The research results can be used to estimate the riverbed erosion and sedimentation in the Jiaojiang River Estuary and provide a reference for the prediction of siltation in the sluice near the estuary.