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含沙水体浓度较高时,泥沙沉降速度受到周围泥沙颗粒的影响,进入制约沉降阶段。总结了泥沙制约沉降速度的影响因素,如含沙水体浮力、黏性、回流等。在此基础上对黏性细颗粒泥沙、粉砂、混合沙制约沉降速度计算方法进行分析。总结了细颗粒泥沙制约沉降速度的主要计算方法,对于黏性细颗粒泥沙或粉砂,主要包括Richardson-Zaki公式及其修正公式、组合式沉降公式;对于混合沙主要包括基于连续性方程、多分散质沉降方法为框架推导的制约沉降公式及其修正扩展公式。事实上多组分泥沙成分复杂,制约沉降计算具有较大的不确定性,后续研究可围绕泥沙组分、生物作用、盐度等因素的作用展开制约沉降速度计算方法的研究。
Abstract：Hindered settling occurs when the settling velocity of sediment is affected by surrounding sediment particles in a hyper-concentrated sediment suspension. The main factors causing hindered settling such as buoyancy, viscosity, wakes, etc., are analyzed. The calculation methods of hindered settling velocities are reviewed for different kind of sediments such as clay, silt and sediment mixtures. The main methods for calculating hindered settling velocities for fine sediments are elaborated. For clay and silt fractions, the Richardson-Zaki formula and its correction formula, combined settling formula are included. For clay-silt mixtures, the main approaches based on the continuity equations and polydisperse concentrated suspensions theory. Due to the complex composition of sediment mixtures, uncertainties exist for of the calculation of hindered settling velocity.
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基本信息:
DOI：10.16239/j.cnki.0468-155x.2022.01.011
中图分类号:TV142.1
引用信息:
[1]许春阳,罗雯,陈永平,等.细颗粒泥沙制约沉降速度计算方法综述[J].泥沙研究,2022,47(01):73-80.DOI:10.16239/j.cnki.0468-155x.2022.01.011.
基金信息:
国家自然科学基金项目(51620105005);国家自然科学基金项目(51979076,51709084,52071129); 国家重点研发计划课题(2018YFC0407501); 中央高校基本科研业务费项目(B200204017)
2021-07-05
2021
2021-09-30
2021-11-19
2021
1
2021-11-22
2021-11-22
2021-11-22