Abstract:

For the sake of accurately revealing the water-heat movement of the full-section soil, the in-situ monitoring on the soil water-heat regime of the deep vadose zone in 2011-2012 at Taihang Mountain was carried out by virtue of the calibrated TDR100 system. Results indicate that in the deep vadose zone, 1)the water-heat transport was a kind of relative hysteretic and reciprocating motion which lasted about 2-3 months because of multiple external condition controlling the zone like deep depth and heterogeneous; 2)coarse particle layer was good water delivery gallery. Fine particle layer was the key one which determined the infiltration ability. And the effect on the soil water content reached 15%; 3)precipitation evaporation and surface temperature controlled the soil water-heat movement in the superficial zone. Contrastively, in the deep zone which was below 5.0 m, lithologic distribution characteristics and groundwater level played leading role normally, while heavy percolation and human activities played key role in some instantaneous condition.

Key words: TDR100 system, deep vadose zone, soil water potential, soil temperature, water-heat movement