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  • Variations in soil dispersivity across a gully head displaying shallow sub-surface pipes, and the role of shallow pipes in rill initiation
  • Almería ; Badland ; Duricrust ; Geochemistry ; Grain size distribution ; Gully erosion ; Micromorphology ; Rill wash ; Spain ; Watershed
  • ). It is concluded that calcium replaces sodium in the crust during leaching, leaving a calcic crust, and a sub-crust that is sodic and prone to subsequent pipe enlargement. Rill morphology in these materials also suggests that rills develop from these pipes when