التفاصيل البيبلوغرافية
العنوان:
Simulating multimodal floc size distributions of suspended cohesive sediments with lognormal subordinates: Comparison with mixing jar and settling column experiments
المؤلفون:
Michael Fettweis , Xiaoteng Shen , Erik Toorman , Qing He , Byung Joon Lee
المصدر:
Coastal Engineering . 148:36-48
بيانات النشر:
Elsevier BV, 2019.
سنة النشر:
2019
مصطلحات موضوعية:
POPULATION BALANCE-EQUATIONS , Technology , Engineering, Civil , Flocculation , Environmental Engineering , 010504 meteorology & atmospheric sciences , Kernel density estimation , Population balance equation , Ocean Engineering , Soil science , 01 natural sciences , Standard deviation , CHANGJIANG ESTUARY , Engineering , Breakage , MOMENTS , QUADRATURE METHOD , Engineering, Ocean , 0105 earth and related environmental sciences , Science & Technology , 010505 oceanography , Turbulence , NUMERICAL SIMULATIONS , Sediment , AGGREGATION , VELOCITY , FINE-GRAINED SEDIMENTS , PARTICLE-SIZE , Floc size distribution , Settling column , Log-normal distribution , FLOCCULATION , Cohesive sediments , Environmental science , Mixing jar , Subordinate lognormal distributions
الوصف:
© 2019 Elsevier B.V. The Floc Size Distributions (FSDs) of suspended fine-grained sediment flocs play a prime role to estimate their own fate and the transport of contaminates attached to the flocs. However, developing an efficient flocculation model that is capable of simulating continuous and multimodal FSDs is still a challenge. Recently, the population balance equation solved by the Quadrature-Based Method of Moments (QBMM) with lognormal kernel density functions has been developed to investigate the aggregation and breakage processes. It coincides with some recent observations which describe a measured FSD in coastal waters with a set of constituted lognormal distributions. The newly developed lognormal QBMM was tested with several ideal flocculation kinetic kernels, none of which, however, was used for interpreting cohesive sediment dynamics. Therefore, it raised our interest to evaluate the model performance for fine-grained sediments in shear turbulence dominated environments. In this study, additional validations against two kaolinite laboratory experiments were tested in the framework of the extended QBMM. It is hypothesized that these subordinate lognormal distributions share the same value of standard deviation. Different from the previous methods, the common standard deviation is determined empirically to reduce the number of tracers and better represent the FSDs. With sediment flocculation kinetics, the predicted FSDs reasonably reproduce the FSDs observed in both the mixing chamber and the settling column experiments. Despite the lacking of explicit descriptions of microbial effects at the current stage, this model has the potential to be implemented into large-scale particle transport models and deserves a more in-depth study in the future. ispartof: COASTAL ENGINEERING vol:148 pages:36-48 status: published
تدمد:
0378-3839
URL الوصول:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::56a52d581cfd2d9eb789f3e3f8def84c https://doi.org/10.1016/j.coastaleng.2019.03.002
حقوق:
OPEN
رقم الأكسشن:
edsair.doi.dedup.....56a52d581cfd2d9eb789f3e3f8def84c
قاعدة البيانات:
OpenAIRE
