Pavelic, P. and Johnston, C.D
(1993)
A laboratory study of the flow processes through layered profiles in relation to clogging in artificial recharge basins.
Technical Report.
CSIRO, Canberra, Australia.
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Abstract
Laboratory column experiments were performed to study the flow processes which occur in artificial recharge basins where clogging causes a low permeability layer to develop on topof higher permeability materials. Experiments were conducted to produce different pressure heads in the coarse materials under the fine textured layer. Two different sets of experiments compared behaviour where the materials were able to desaturate by allowing air access to the column and behaviourwhere air was excluded from the column. Results showed that flow rates were reduced dramatically when the pressure head in the coarse materials fell below their air entry value and the materials desaturated. Where air was prevented from entering the column. pressure head fell below the air entryvalue without affecting the hydraulic conductivity of the materials or the column as a whole. Apparent difficulties with the stability of the fine textured layer and tensiometer emplacement prevented conclusions to be drawn about any possible desaturation in the fine textured layer and its effecton flow rates. The experiments have shown that hydraulic processes within the subsoil below the crust or clogging layer may dominate flow rates through the profile. Development of unsaturated conditions should be avoided to maximize flow rates. Also, the unsaturated hydraulic characteristics of thematerials below a crust or finer textured layer are important to the operation of a recharge basin.
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