Transforming Hydrographs in the Hillslope Subsurface

• Published in: Journal of Hydrology and Hydromechanics 2009-12, Vol.57 (4), p.264-275
• Main Authors: Sanda, Martin, Císlerová, Milena
• Format: Article
• Language: English
• Subjects: crystalline granite bedrock; dystric cambisol; dystrická kambizem; experimental catchment; experimentální povodí; hydrological monitoring; hydrologické monitorování; Hydrology; krystalické žulové podloží; podpovrchový příkop; preferential flow; preferenční proudění; půdní vlhkost; Sea level; soil moisture; subsurface trench
• ISSN: 0042-790X; 1338-4333
• DOI: 10.2478/v10098-009-0023-z

Transforming Hydrographs in the Hillslope Subsurface To reveal and evaluate the mechanism of transforming rainfall into runoff in the region, where the subsurface flow plays a dominant role in the runoff formation, a continuous hydrological and climatic data monitoring has been set-up in the experimental catchment Uhlírská (the Jizera Mountains, CR). The soil profile (Dystric Cambisol), formed on the weathered granite bedrock, is shallow and highly heterogeneous. Beside a standard catchment data observation a hillslope transect was instrumented to control the flow dynamics in the soil profile. From three soil horizons, the subsurface outflow is recorded in the subsurface trench. Adjacent to the trench the soil water suction is scanned by triplets of automatic tensiometers. Within the soil profile the unsaturated regime prevails, nevertheless the soil keeps almost saturated. Nearly simultaneous reaction of suction on a rainfall in all soil horizons implies a rapid vertical flow. Local preferential flow paths are conducting infiltrating water at significantly variable rates when saturation is reached. Groundwater table, soil moisture and subsurface runoff measured at the hillslope transect and the total outflow from the catchment, are correlated. The outflow from the catchment is dominantly controlled by soil moisture however the mechanism of its generation is not yet fully understood.