Saturated hydraulic conductivity of sulfuric horizons in coastal floodplain acid sulfate soils: Variability and implications

摘要: The saturated hydraulic conductivity (Ks) of sulfuric horizons exerts a fundamental control on the connectivity between shallow groundwater and drains in coastal acid sulfate soils (CASS), strongly influencing rates lateral seepage towards or from field drains. Ks was assessed seven major floodplains eastern Australia using an situ recovery technique conducted ~0.4–0.65 m deep pits. Duplicate tests were total 148 pits located 32 separate geomorphic units across floodplains. Most constructed clay with acidic (pH 500 day -1 . Data are log normally distributed median ~15.4 Over 40% had values >20 , challenging assumption that CASS landscapes is generally low. Visual observations confirm high associated macropore flow. These data demonstrate floodplain can be very extremely variable within individual findings highlight need for site specific assessments soil properties order to ensure appropriate design application management techniques.