Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 21 Transdisciplinary concepts and modelling strategies for the assessment of complex environmental systems 2009 10.5194/adgeo-21-99-2009 http://www.adv-geosci.net/21/99/2009/ http://www.adv-geosci.net/21/99/2009/adgeo-21-99-2009.html http://www.adv-geosci.net/21/99/2009/adgeo-21-99-2009.pdf 99 107 2009-08-12 Land-use effects on flood generation – considering soil hydraulic measurements in modelling A. Wahren wahren@forst.tu-dresden.de K.-H. Feger K. Schwärzel A. Münch Institute of Soil Science and Site Ecology, Dresden Water Center, TU Dresden, Faculty of Forest, Geo and Hydro Sciences, 01735 Tharandt, Germany Dr. Dittrich & Partner Hydro-Consult GmbH, 01728 Bannewitz, Germany The investigation in the catchment of the Mulde (51°0'55" N, 13°15'54" E Saxony, Germany) researches the effect of afforestation measures on the soil hydraulic properties. The concept of a "false chronosequence" was used to quantify the time-dependent dynamical character of the forest impact. Four adjacent plots were identified at a test location with comparable pedological start conditions and a set of tree stands of different age: (1) arable field (initial state); (2) 6-year-old afforestation; (3) 50-year-old afforestation; (4) ancient natural forest ("target" stocking). Water retention curves and unsaturated conductivities were analysed in the lab. In the field, the undisturbed infiltration capacities were measured quantitatively (hood infiltrometer) and qualitatively (brilliant blue tracer). Pronounced differences between all 4 plots were detected. The afforestation causes an increased infiltration and soil water retention potential. Especially the topsoil layers showed a distinct increase in conductivity and portion of coarse/middle pores. 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