ABSTRACT
Climate change offers new perspectives for reservoirs near the glacial environment. These reservoirs will benefit from increased water supply but will also likewise be affected by increased sedimentation. In the present project, sediment transport processes were studied in the Griessee reservoir. 48% of its catchment area is covered by glaciers. Particle size distribution (PSD) and suspended sediment concentration (SSC) were examined. Measurements were conducted with Niskin bottle sampler, laser in-situ scattering transmissometry (LISST), acoustic Doppler current profiler (ADCP) and were compared with each other. PSD and SSC show only minor fluctuations in the lake. The major part of the suspended sediments consists of silt, median diameters are between 5 and 10 μm. Average SSC is 80 mg/l. A turbidity current was detected with ADCP. The combination of the three techniques was proven to be suitable for assessing sediment fluxes in periglacial reservoirs at high resolution.
