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与小粗糙度条件相比，大粗糙度条件下的泥沙起动规律更为复杂，经典的希尔兹曲线难以直接应用于大粗糙度条件。鉴于此，基于床面阻力研究中的流层划分原理，提出了大粗糙度条件下的临界希尔兹数计算方法。在前人的研究基础上，基于小粗糙度条件下的泥沙起动规律，建立了小粗糙度条件下的临界希尔兹数计算公式。对比分析大粗糙度和小粗糙度条件下的泥沙起动规律，建立了大粗糙度条件下的临界希尔兹数计算公式。经与水槽实测资料、野外实测资料及其他经典泥沙临界希尔兹数公式的对比，表明建立的公式具有良好的适用性。
Abstract：In comparison with small roughness conditions, the initial law of sediment motion under large roughness conditions is more complex, and the classical Shields curve is difficult to apply directly to conditions with large roughness. In view of this, based on the principle of flow layer division in the study of bed surface resistance, a calculation method for the critical Shields number under high roughness conditions is proposed. A formula for calculating the critical Shields number under small roughness conditions is established based on the corresponding sediment initiation law of previous research. By comparative analysis of the sediment initiation laws under conditions of high and low roughness, a critical Shields number under conditions of high roughness is established. The formula has good applicability after comparing flume data, field measurements, and other classical sediment critical Shields number formulas.
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基本信息:
DOI：10.16239/j.cnki.0468-155x.2026.01.002
中图分类号:TV143
引用信息:
[1]许晓阳,王平,魏欢,等.大粗糙度条件下的临界希尔兹数[J].泥沙研究,2026,51(01):9-15.DOI:10.16239/j.cnki.0468-155x.2026.01.002.
基金信息:
国家自然科学基金项目(U2243218);国家自然科学基金项目(51879227); 河南省重大科技专项(231100320100)
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