FLOW PATTERNS DURING EXTENDED SATURATED FLOW IN 2, UNDISTURBED SWELLING CLAY SOILS WITH DIFFERENT MACROSTRUCTURES

Large, undisturbed soil columns with an average height of 30cm, a diameter of 25cm, and with 2 different types of macrostructure were sampled in moist clay soil. Type 1 had vertical wormchannels and 'rough' peds; type 2 had no worm channels and 'smooth' peds. Flow patterns were characterized by repeatedly measuring Ksat and chloride breakthrough curves. Effective pore size distributions were calculated from the latter with the Klinkenberg procedure. -from Authors