Effect of riverbed sediment flushing and clogging on river-water infiltration rate: a case study in the Second Songhua River, Northeast China | Effet de la chasse et du colmatage des sédiments du lit d’une rivière sur le taux d’infiltration de l’eau: une étude de cas dans la deuxième rivière Songhua, au Nord-Est de la Chine Efecto del lavado y la depositación de sedimentos en la tasa de infiltración en el cauce de un río: un estudio de caso en el Second Songhua River, noreste de China 河床沉积物的冲淤对河水入渗速率的影响-以中国东北第二松花江为例 Efeito da descarga e do depósito no leito do rio e na taxa de infiltração da água do rio: um estudo de caso no Segundo Rio Songhua, nordeste da China
2021
Cui, Geng | Su, Xiaosi | Liu, Yan | Zheng, Shida
Infiltration from natural rivers or streams is the most important source of aquifer recharge at riverbank filtration (RBF) sites. Due to the influence of river hydrological processes and changes in suspended solids in rivers, riverbed sediments often undergo significant flushing and clogging processes, which lead to obvious spatial and temporal changes in riverbed sediment permeability. Moreover, the lithology, structure, and thickness of natural riverbed sediments change with time, influencing the bank infiltration rate into groundwater. At present, how riverbed-sediment flushing and clogging influences the sediment hydraulic conductivity is not fully understood, which results in high uncertainty about the amount of water involved in RBF. An RBF site in the middle reach of the Second Songhua River, northeastern China, was studied, and continuous time series data of riverbed-sediment hydraulic conductivity were obtained for the first time. By identifying the hydrological conditions, using field monitoring, laboratory experiments and field tests, the mechanisms of change associated with sediment lithology, infiltration rate, and hydraulic conductivity during flushing and clogging processes were revealed.
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