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水流挟沙力是反映河床处于冲淤平衡状态下水流挟带泥沙能力的综台性指标。作者通过对众多挟沙力公式的分析比较,基于量纲和谐的考虑,建立了新的挟沙力公式形式。本文以长江口的泥沙输运为例,利用长江口泥沙实测资料,研究了新建立的挟沙力公式在长江口的适用性。计算结果表明,本文作者建立的公式在长江口具有一定的适用性,与刘家驹公式相比较,计算精度差不多,计算结果尚令人满意,但还存在一定的误差,说明将本文建立的挟沙力公式进行率定后,可以将其推广到近岸河口海域,为工程实践提供有益的参考价值。
Sediment-carrying capacity of water flow is a comprehensive index that reflects the ability of sediment to carry sediment under the scouring and silting balance of the riverbed. Based on the analysis and comparison of many formulas of sediment carrying capacity, the author establishes a new formula of sediment carrying capacity based on the consideration of dimensional harmony. Taking the sediment transport in the Yangtze Estuary for example, this paper studies the applicability of the newly established sediment-carrying capacity formula in the Yangtze Estuary by using the measured sediment data from the Yangtze Estuary. The calculation results show that the formula established by the author has some applicability in the Yangtze Estuary. Comparing with the Liujiaju formula, the calculation accuracy is similar, but the calculation result is still satisfactory, but there is still some error, indicating that the sediment-carrying force After formulating the formula, it can be extended to nearshore estuary waters, providing useful reference value for engineering practice.