Effects of variable sediment - water fluxes on water quality in lakes and oceans
Event details
Date | 21.10.2014 |
Hour | 16:15 › 17:15 |
Speaker | Dr Lee Bryant, Research Unit for Water, Environment and Infrastructures Resilience, Dept of Architecture and Civil Engineering, University of Bath, UK |
Location | |
Category | Conferences - Seminars |
Abstract:
Dynamic turbulence in the bottom boundary layer can have significant influence on thevertical distribution of dissolved oxygen (O2)and other solutes at the sediment-water interface. In marine environments, O2 penetration into the sediment is strongly affected by transport processes such as wave-driven turbulence and molecular diffusion. In lacustrine environments, which typically have decreased turbulence and less-permeable sediments, transport of O2 through the diffusive boundary layer controls sediment O2 uptake. While turbulence in marine systems is often much greater than in lakes and reservoirs due to tidal motion, it is becoming apparent that sediment O2 uptake in lacustrine systems may vary in response to turbulence much more extensively than previously thought. Results will be presented from several studies that focus on how turbulence and sediment composition affects sediment O2 uptake, nutrient fluxes, and subsequent water quality in both lacustrine and marine environmentsusing simultaneous in-situ current velocity and concentration measurements. This presentation will highlight the 1) transient nature of sediment-water fluxes and 2) similarities and differences in the processes controlling these fluxes in lacustrine and ocean environments.
Short biography:
Originally from Knoxville, Tennessee, USA, I obtained my Bachelor of Science degree in Civil Engineering at the University of Tennessee in 2000. I performed graduate work on biogeochemical cycling and drinking water quality at Virginia Tech (USA) and Eawag (Master of Science in Geotechnical Engineering in 2003 and PhD in Civil and Environmental Engineering in 2010). I worked as a US NSF Earth Science Postdoctoral Fellow at Duke University (USA) and ETH Zurich from 2010-2012 studying biogeochemical cycling of manganese. I am currently working at the Helmholtz Centre for Ocean Research Kiel (Germany) researching oxygen and nutrient fluxes in oceanic oxygen minimum zones. I will begin a faculty position within the Department of Architecture and Civil Engineering at the University of Bath (UK) in September 2014.
Dynamic turbulence in the bottom boundary layer can have significant influence on thevertical distribution of dissolved oxygen (O2)and other solutes at the sediment-water interface. In marine environments, O2 penetration into the sediment is strongly affected by transport processes such as wave-driven turbulence and molecular diffusion. In lacustrine environments, which typically have decreased turbulence and less-permeable sediments, transport of O2 through the diffusive boundary layer controls sediment O2 uptake. While turbulence in marine systems is often much greater than in lakes and reservoirs due to tidal motion, it is becoming apparent that sediment O2 uptake in lacustrine systems may vary in response to turbulence much more extensively than previously thought. Results will be presented from several studies that focus on how turbulence and sediment composition affects sediment O2 uptake, nutrient fluxes, and subsequent water quality in both lacustrine and marine environmentsusing simultaneous in-situ current velocity and concentration measurements. This presentation will highlight the 1) transient nature of sediment-water fluxes and 2) similarities and differences in the processes controlling these fluxes in lacustrine and ocean environments.
Short biography:
Originally from Knoxville, Tennessee, USA, I obtained my Bachelor of Science degree in Civil Engineering at the University of Tennessee in 2000. I performed graduate work on biogeochemical cycling and drinking water quality at Virginia Tech (USA) and Eawag (Master of Science in Geotechnical Engineering in 2003 and PhD in Civil and Environmental Engineering in 2010). I worked as a US NSF Earth Science Postdoctoral Fellow at Duke University (USA) and ETH Zurich from 2010-2012 studying biogeochemical cycling of manganese. I am currently working at the Helmholtz Centre for Ocean Research Kiel (Germany) researching oxygen and nutrient fluxes in oceanic oxygen minimum zones. I will begin a faculty position within the Department of Architecture and Civil Engineering at the University of Bath (UK) in September 2014.
Practical information
- General public
- Free
- This event is internal
Organizer
- EESS - IIE
Contact
- Prof. Samuel Arey, LMCE