Effect of ship locking on sediment oxygen uptake in impounded rivers.

Lorke, A., McGinnis, Daniel F., Maeck, A. and Fischer, H. (2012) Effect of ship locking on sediment oxygen uptake in impounded rivers. Water Resources Research, 48 (12). W12514. DOI 10.1029/2012WR012483.

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Abstract

In the majority of large river systems, flow is regulated and/or otherwise affected by
operational and management activities, such as ship locking. The effect of lock operation on
sediment-water oxygen fluxes was studied within a 12.9 km long impoundment at the Saar
River (Germany) using eddy-correlation flux measurements. The continuous observations
cover a time period of nearly 5 days and 39 individual locking events. Ship locking is
associated with the generation of surges propagating back and forth through the
impoundment which causes strong variations of near-bed current velocity and turbulence.
These wave-induced flow variations cause variations in sediment-water oxygen fluxes.
While the mean flux during time periods without lock operation was 0.5 6 0.1 g m�2 d�1,
it increased by about a factor of 2 to 1.0 6 0.5 g m�2 d�1 within time periods with ship
locking. Following the daily schedule of lock operations, fluxes are predominantly
enhanced during daytime and follow a pronounced diurnal rhythm. The driving force for the
increased flux is the enhancement of diffusive transport across the sediment-water interface
by bottom-boundary layer turbulence and perhaps resuspension. Additional means by which
the oxygen budget of the impoundment is affected by lock-induced flow variations are
discussed.

Document Type: Article
Additional Information: WOS:000312399900003
Keywords: impoundment ; river ; sediment oxygen uptake ; ship navigation; EDDY-CORRELATION; ENVIRONMENTAL FLOWS; DISSOLVED-OXYGEN; BOTTOM BOUNDARY; FLUX; LAKES; TURBULENCE; NUTRIENT; SYSTEMS; LAYER
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2012WR012483
ISSN: 0043-1397
Date Deposited: 17 Dec 2012 09:14
Last Modified: 26 Apr 2016 09:36
URI: http://oceanrep.geomar.de/id/eprint/19830

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