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Porosity of bimodal and trimodal sediment mixtures

International Journal of Sediment Research 2022年第2期37卷 258-271页

作者： chamil perera Weiming Wu Ian Knack Department of Civil and Environmental Engineering Clarkson University

This study focuses on the prediction of the porosity of nonuniform sediment mixtures,considering the effects of particle packing.A random particle packing model has been developed for the porosity of bimodal mixtures by extending the existing random particle filling theory.Coefficients in the developed model are calibrated by fitting the model to measured data for a variety of bimodal mixtures,including spherical glass particles,rounded quarry grains,and natural sediments.The model coefficients are found to be functions of the diameter ratio of coarse and fine particles,separately for spherical glass particles and natural sediments due to differences in particle shapes.The bimodal mixture model is then extended to trimodal particle mixtures in three approaches:two based on serial packing and one based on random packing.These models are tested against experimental data of six trimodal mixtures with spherical glass beads.The results show that the random packing model and the fine-medium-coarse particle serial packing model predict well the observed trimodal mixture porosities.

关键词： Porosity Particle filling Particle packing Bimodal mixture Trimodal mixture

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Erosion rate of sand and mud mixtures

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International Journal of Sediment Research 2020年第6期35卷 563-575页

作者： chamil perera Jarrell Smith Weiming Wu David Perkey Anthony Priestas Department of Civil and Environmental Engineering Clarkson University Coastal and Hydraulics Laboratory US Army Corps of Engineers

Erosion of mixed cohesive and noncohesive sediments is studied using the erosion test instrument SEDFlume.The sediment mixtures are composed of well-sorted quartz sand(0.25-0.5 mm) and one of the three used muds:kaolinite,kaolinite-bentonite and Mississippi River muds.The mud contents cover from 0 to 100%.The measured data of erosion rate and bed shear stress are used to examine the segmented linear,nonlinear,and exponential erosion models.The parameters of each erosion model are related to the physical properties of sediment mixtures,including clay fraction,mud fraction,mixture dry density,and mud dry density.It is found that the three models can fit well with the data,and their parameters have strong relations with the mud fraction and mud dry density,to a less extent with the clay fraction,but not with the mixture dry density.

关键词： Cohesive sediments Noncohesive sediments Sand and mud mixtures Segmented linear model Nonlinear model Exponential model

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