Experimental investigation on dynamic contaminant release from permeable sediment layer under oscillating flow

摘要：

　　The dynamic contaminant release properties for the permeable sediment layer under different flow conditions,including steady flow, periodic unidirectional unsteady flow and bidirectional oscillating (reciprocating) flow, were investigated by means of water channel flume experiment, and the hydrodynamic influencing mechanism of the unsteady flow feature on the contaminant transport process in interfacial exchange zone was further analyzed.The experimental results indicate that the interfacial contaminant dynamic release rate under the bidirectional oscillating flow is shown to be a notable increase as comparing to that in the case of unidirectional steady or unsteady flows.The interfacial contaminant release rate tends to increase with the increasing average flow velocity, decreasing period and augmenting amplitude for the case of the considered oscillating flow.And the hydrodynamic influencing mechanism by which the substantially enhanced direct mass exchange between the overlying water and the pore water within the permeable sediment layer occurs, which becomes a dominant mass transport process in the interfacial exchange zone, is predominantly attributed to the flow reversal during each period under the oscillating flow condition.

关键词： Sediment contaminant dynamic release oscillating flow

作者: Jingyu Fan Daozeng Wang

作者单位: Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University Shanghai 200072, China

会议类型: 国际会议

会议名称: The Second Conference of Global Chinese Scholars on Hydrodynamics(第二届全球华人水动学学术会议)

会议地点: 江苏 无锡

会议语种:英文

页码: 217-221

在线出版日期: 2016-11-11（万方平台首次上网日期，不代表论文的发表时间）