Influence of multiple stressors on N, C and Fe turnover in the hyporheic zone
Climate change is expected to increase the frequency of periods with little or no rainfall, which will lead to low water levels and flow in streams. Such dry periods have been observed several times in Bavaria during mid and late summer over the last decade. During such draught periods there is an increased risk that certain spots of steam sediment have little or no oxygen, which is both chemically and biologically relevant for stream health. The low oxygen levels induces a whole series of chemical reactions, which are easily recognized by the precipitation of reddish brown iron hydroxides on the steam bed, vegetation and other stream material.
When and where do such oxygen-free zones occur? What is the influence of elevated temperatures, low discharge rates and sediment input on their development? The results of this subproject are important to assess the future water quality of streams and their ecological status.
Prof. Dr. Stefan Peiffer
Department of Hydrology
University of Bayreuth
Tel: +49 921 55 2251