Abstract
AbstractVarious lab and field experiments were conducted to determine the vertical hydraulic conductivity of two highly compressible, organic‐rich clayey silts (Holocene marsh sediments Klei and gyttja). Constant‐head permeameter tests in the lab show an increase in measured hydraulic conductivity with sample size by a factor of 5 (Klei) and 20 (gyttja). On a field scale, six different methods were tested: (1) evaluation of the propagation of the tidal wave from the aquifer into the silts; (2) aquitard reaction test; (3) evaluation of aquifer drawdown; (4) slug test; (5) evaluation of vertical profiles of measured organic contaminant concentrations in the silts; (6) evaluation of benzene concentrations measured in aquifer wells. Porous cup pressure cells instead of piezometers must be used to measure relatively fast changes of hydraulic head in these low‐permeability media. Comparison of the results is hampered by spatial heterogeneity.
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