Modelling of flocculation and transport of cohesive sediment from an on-stream stormwater detention pond

• Published in: Water research (Oxford) 2002-09, Vol.36 (15), p.3849-3859
• Main Authors: Krishnappan, Bommanna G., Marsalek, Jiri
• Format: Article
• Language: English
• Subjects: Applied sciences; Cohesive sediment; Collision frequency; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Exact sciences and technology; Floc size distribution; Flocculation; Geologic Sediments; Models, Theoretical; Natural water pollution; Pollution; Pollution, environment geology; Rain; Rainwaters, run off water and others; Reservoirs; Rotating circular flume; Sediment transport; Sediments; Settling; Storm water; Stormwater detention pond; Water; Water Movements; Water Pollution - prevention & control; Water treatment and pollution
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/S0043-1354(02)00087-8

A new model to predict the transport characteristics of suspended sediment from an on-stream stormwater management pond is presented. It is based on Krishnappan's model of flocculated settling in still water, which was extended to dynamic conditions and verified by experiments with stormwater pond sediment in a laboratory rotating flume. The model was derived from first principles, but some input parameters, such as floc properties, had to be obtained by calibration, and input parameters describing flow field properties were obtained from a k− ε turbulence model. Simulated suspended concentrations vs. time and the size distribution of the flocculated sediment, produced with the calibrated model, agreed well with flume measurements.