Abstract
Time Variations of Sediment Floc Size and Density by using Settling Column Data
Highlights
The investigation of settling process and cohesive sediments consolidation in dam reservoirs and beaches is one of the most important issues playing an effective role in different descaling and sediment controlling designs, including dredging projects and hydraulic sediment removal operations
Results showed as the initial concentration of experiment increases, the gradient of deep changes in concentration increases as well, such that the average gradient of depth changes in concentration for initial concentration of 3 gr/ L is equal to 0.3 g/l per each meter of depth
The results show that the maximum settling velocity of sediments is about 8 times the average settling velocity of the sediments, which shows significant flocculation of the sediments
Summary
The investigation of settling process and cohesive sediments consolidation in dam reservoirs and beaches is one of the most important issues playing an effective role in different descaling and sediment controlling designs, including dredging projects and hydraulic sediment removal operations. The superfine cohesive sediments even settle in the canals in which the existing standard criteria of design have been observed. They have settled in dam reservoir and resulted in trapping efficiency near 100%. In addition to reducing the service life of reservoir, this problem has changed the limpidity of the water released from the existing reservoir, ecology and morphology of the downstream river. In the beaches and seaports, the cohesive sediments settlement has caused an increase in dredging costs. In many cases it is impossible to overcome this phenomenon in practice [1]
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