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Experimental study on flocculation and sedimentation characteristics of cohesive fine sediment measured using ultrasound in the Pearl River Estuary

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International Journal of Sediment Research 2023年第6期38卷 880-890页

作者： Qinqin Liu Xiaojian Liu Jian Chen Peng Hou Yong He Qisong Wang Xiaowei Zhu Qiang Wang Huan Gao Pearl River Hydraulic Research Institute Pearl River Water Resources Commission of the Ministry of Water Resources Key Laboratory of the Pearl River Estuary Regulation and Protection of the Ministry of Water Resources School of Water Conservancy North China University of Water Resources and Electric Power Department of the College of Water Conservancy and Hydropower Engineering Hohai University

flocculation-settling of cohesive fine sediment is the main cause of sediment deposition and changes in topography and geomorphology in ***,studies on estuary morphology have often focused on a single influencing factor,and sediment deposition characteristics under disturbances in sediment concentration,moisture content,and external forces have rarely been considered *** authors propose an ultrasound-assisted flocculation-settling method to analyze the various factor affecting cohesive *** current study examined the sedimentation patterns of cohesive sediment with a sediment content concentration of 30%-80% through ultrasound *** results show that when the sediment concentration is 40%-50%,the best effect on flocculation and sedimentation is induced by ultrasound *** corresponding settling height at the clear-muddy water interface is 3.05-3.45 cm,and the settling rate is 0.161-0.173 cm/***,using ultrasound waves,a moisture content of the sediment concentration of 30%-80% was analyzed based on wet and dry *** a sediment concentration of 50% as an example,the maximum values of the variation in the water contents of the upper,middle,and lower layers of the wet basis were 0.82%,0.51%,and0.37%,respectively,whereas those of the upper,middle,and lower layers of the dry basis were 4.77%,1.07%,and 0.60%,***,the moisture content of dry and wet sediment varied as follows:Wupper> Wmiddle> *** current research results can provide a theoretical basis and technical reference for siltation in channels,harbors,and reservoirs;the evolution of submarine deltas and coastal beaches;transportation of fluid mud;and the treatment of hyper-concentrated sediment flows.

关键词： Cohesive sediment flocculation-settling Moisture content Ultrasound experiments

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