Next Article in Journal
Impact of Urban Stormwater Runoff on Cyanobacteria Dynamics in A Tropical Urban Lake
Next Article in Special Issue
Typhoon Soudelor (2015) Induced Offshore Movement of Sand Dunes and Geomorphological Change: Fujian Coast, China
Previous Article in Journal
Formulation and Implementation of Short-Term Optimal Reservoir Operation Schemes Integrated with Operation Rules
Previous Article in Special Issue
A Two Decadal (1993–2012) Numerical Assessment of Sediment Dynamics in the Northern Gulf of Mexico
Article Menu
Issue 5 (May) cover image

Export Article

Open AccessArticle

The Influence of Temperature on the Bulk Settling of Cohesive Sediment in Still Water with the Lattice Boltzmann Method

1
CCCC-FHDI Engineering Co., Ltd., Guangzhou 510230, China
2
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
3
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
4
Key Laboratory of Coastal Disaster and Defence (Hohai University), Ministry of Education, Nanjing 210098, China
*
Authors to whom correspondence should be addressed.
Water 2019, 11(5), 945; https://doi.org/10.3390/w11050945
Received: 9 April 2019 / Revised: 27 April 2019 / Accepted: 1 May 2019 / Published: 5 May 2019
  |  
PDF [5327 KB, uploaded 20 May 2019]
  |  

Abstract

Flocculation is very common and significant for cohesive sediment in coastal areas, and the influence of temperature on it cannot be neglected. The Lattice Boltzmann Method (LBM), combined with the extended Derjaguin‒Landau‒Verwey‒Overbeek (XDLVO) theory, which considers the micro-interaction forces between particles, was applied to simulate the settling and flocculation processes of cohesive sediment under various temperature conditions. The floc size, floc volume, suspended sediment concentration (SSC), and settling velocities were analyzed. The analyses revealed that with increasing temperature, both the mean floc diameter and floc volume grew, while the maximum floc diameter initially increased and then slightly decreased with its peak at 10 °C. During settling, the SSC change rate was exponentially related to the SSC, with an optimal fitting index of 0.3. The LBM sediment settling velocity was also compared with some formulas and physical model tests; the comparison results consistently demonstrated that the LBM was reasonable for modeling the bulk settling of cohesive sediment. Further discussions illustrated that the cohesive sediment is more difficult to flocculate at low temperatures due to the low aggregation frequency, while at high temperatures, some large flocs broke easily due to the effect of the short-distance force and macro force. View Full-Text
Keywords: temperature; cohesive sediment; bulk settling; flocculation; LBM; XDLVO; capture frequency temperature; cohesive sediment; bulk settling; flocculation; LBM; XDLVO; capture frequency
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Qiao, G.-Q.; Zhang, J.-F.; Zhang, Q.-H.; Feng, X.; Lu, Y.-C.; Feng, W.-B. The Influence of Temperature on the Bulk Settling of Cohesive Sediment in Still Water with the Lattice Boltzmann Method. Water 2019, 11, 945.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top