Natural recovery of infiltration capacity in simulated bank filtration of highly turbid waters.

摘要: As a consequence of the suspended sediments in river water, cake formation on streambed and clogging aquifer may occur, leading to decline production yield riverbank filtration systems, particularly highly turbid waters. However, naturally occurring flow forces induce sufficient scouring streambed, thereby self-regulating thickness formed layer. This study assessed recovery infiltration capacity simulated physically clogged system, due self-cleansing processes. A straight tilting flume, provided with an column at bottom, was used for emulating clogging, self-cleansing. Based presented research it be concluded that mixture different sediments, as found natural water bodies, can already recovered low shear stresses. Clay silt behaved very differently, difference cohesiveness. produce persistent sticky layer, whereas penetrated deeper into bed, both resulting absence velocity recovery. layer fine sand easiest remove, dune streambed. deep bed by particles coarser did not fully recover. The interaction between mixed (5% clay, 80% silt, 15% sand) resulted uneven erosion patterns during is low. Altogether bank waters expected long carries too coarse.