Browsing by Author "Wahren, A."

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Identification and Model Based Assessment of the Potential Water Retention Caused by Land-Use Changes
(2007) Wahren, A.; Schwarzel, K.; Feger, K. H.; Munch, A.; Dittrich, I.
"The extreme summer flood in the Elbe River watershed initiated a debate on the role of forest conversion and afforestation as measures for preventive flood protection. To quantify the effect of forest conversion and afforestation on flood runoff from catchments reliable model calculations are essential. The article overviews the present state of our work and provides an example for a model-based assessment of potential water retention caused by land-use changes in a catchment in the Central Ore Mountains (Saxony, Germany)."
Land-Use Effects on Flood Generation: Considering Soil Hydraulic Measurements in Modelling
(2009) Wahren, A.; Feger, K. H.; Schwarzel, K.; Munch, A.
"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. The influence of these changes on rainfall-runoff calculations at the test location was analysed in this study."