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Multimodal particle size distributions of fine-grained sediments: mathematical modeling and field investigation

机译：细颗粒沉积物的多峰粒度分布：数学建模和现场调查

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摘要

Multimodal particle size distributions (PSDs) of fine-grained cohesive sediments are common in marine and coastal environments. The curve-fitting software in this study decomposed such multimodal PSDs into subordinate log-normal PSDs. Four modal peaks, consisting of four-level ordered structures of primary particles, flocculi, microflocs, and macroflocs, were identified and found to alternately rise and sink in a flow-varying tidal cycle due to shear-dependent flocculation. The four modal PSD could be simplified further into two discrete size groups of flocculi and floes. This allowed the development of a two-class population balance equation (TCPBE) model with flocculi and floes to simulate flocculation involving multimodal PSDs. The one-dimensional vertical (1-DV) TCPBE model further incorporated the Navier-Stokes equation with the κ-ε turbulence closure and the sediment mass balance equations. Multimodal flocculation as well as turbulent flow and sediment transport in a flow-varying tidal cycle could be simulated well using the proposed model. The 1 -DV TCPBE was concluded to be the simplest model that is capable of simulating multimodal flocculation in the turbulent flow field of marine and coastal zones.
机译：细粒粘性沉积物的多峰粒度分布（PSDs）在海洋和沿海环境中很常见。本研究中的曲线拟合软件将这种多峰PSD分解为从属对数正态PSD。四个模态峰由初级粒子，絮凝物，微絮凝物和大絮凝物的四级有序结构组成，由于剪切相关的絮凝作用，在一个随风变化的潮气周期中交替上升和下沉。可以将四个模态PSD进一步简化为絮状和絮状的两个离散大小组。这允许开发具有絮凝物和絮凝物的两类人口平衡方程（TCPBE）模型，以模拟涉及多峰PSD的絮凝。一维垂直（1-DV）TCPBE模型进一步将Navier-Stokes方程与κ-ε湍流闭塞和沉积物质量平衡方程相结合。使用所提出的模型可以很好地模拟多流絮凝以及湍流变化中的湍流和泥沙输送。结论1 -DV TCPBE是最简单的模型，能够模拟海洋和沿海地区湍流场中的多峰絮凝。

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