UFZ-Seminar "Water and Environment"

Programme 2017

16 January 2017, 3pm - Lee Bryant (University of Bath, UK)

20 February 2017, 3pm - Uwe Müller (LfULG)

10 April 2017, 3pm - Steven Fassnacht (Colorado State University, USA)

19 June 2017, 3pm - Michael Hupfer (Leibniz-Institut für Gewässerökologie und Binnenfischerei, Berlin)

16 October 2017, 3pm - Sarian Kosten (Institute for Water and Wetland Research , Radboud University, Nijmegen/NL)

18 December 2017, 3pm - Stephan Hilgert (KIT)

Programme 2018

15 January 2018, 3pm - Thomas Alexander Davidson (Aarhus University, DK)

19 February 2018, 3pm - Hubert Lohr (SYDRO Consult GmbH)

16 April 2018, 3pm - Stephan Heimerl (FICHTNER Water & Transportation GmbH, Stuttgart)

Stephan Hilgert (Institute for Water and River Basin Management, Department of Aquatic Environmental Engineering, Karlsruhe Institute of Technology (KIT), Germany)

From point to spatial information - Investigations of freshwater reservoirs using hydro acoustic methods and potential implications for the reservoir management

Monday, December 18th 2017, 3pm
Brückstraße 3a, 39114 Magdeburg, Seminarroom

Hydropower generation and the supply of drinking water as well as water for irrigation represent the most important purposes of reservoirs. However, the construction of reservoirs leads to severe disruptions of riverine ecosystems. Transported material is trapped in front of the dams and accumulates as sediment in the impoundment. The sediment in the reservoirs plays a major role in the context of eutrophication, greenhouse gas production and loss of storage volume. Changing morphology, hydrodynamic conditions and reservoir operation as well as wide-ranging characteristics of the catchment area may lead to reservoir-specific sediment characteristics. The often very large surface area of the reservoirs will make it impossible to obtain sufficient sediment information for a reliable spatial interpolation. Therefore, the application of modern techniques for sediment detection and classification are needed.
We combined two echo sounding setups (EA 400: linear 200 kHz, 38 kHz and SES 2000 compact: parametric sub-bottom profiler 100 kHz, 6 kHz), in order to obtain detailed acoustic sediment information. The acoustic data was processed and assessed for the following purposes:
• Sediment mass detection
• Gas void detection
• Sediment classification
For all three parameters specific ground truthing data was collected using a gravity corer, of a dynamic penetrometer and freeze cores. Altogether, five reservoirs in Germany and Brazil were investigated.
It could be shown that hydro acoustic data can be highly valuable for the lifetime assessment, the sediment management, carbon budget calculation and greenhouse gas emission estimations as well as general reservoir operation strategies.