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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : Freshwater related transport processes in the elbe estuary
Freshwater related transport processes in the elbe estuary
Author : HARTMUT HEIN(1), STEPHAN MAI(1) & ULRICH BARJENBRUCH(1)
ABSTRACT
One paradigm of estuarine ecology is that the ecology (e.g. phytoplankton) responds to changes in vertical stratification,
which is controlled by the balance between buoyancy flux from freshwater inflow and the dissipation of kinetic energy by
tidal (or wind) mixing. The Elbe River is one of the largest rivers in Europe (O(1000 km)) and tidal influences in the
estuary reaches O(150 km) inward from the center of the German Bight to the weir in Geesthacht. The hydrological
regime of the Elbe estuary is dominated by tides, mainly by the M2 tide and its overtides. Tidal dispersion modifies the
discharge power spectrum upstream the brackish water zone, where mixing and straining processes establish density
driven circulation patterns. Long-term measurements, originated from the Federal Waterways and Shipping
Administration - spanning the years 1998 to 2013 - are analyzed. The measurement instruments of conductivity and
currents are placed near surface as well as near bottom. They attain temporal resolutions of 5 minutes and a spatial
resolution of O(10) km. The measurements of discharge, conductivity and currents undergo strictly quality assurance
including outlier testing, gab filling and breakpoint search. Based on current velocity and conductivity measurements
salinity dynamics are analyzed. Processes like advection, straining and mixing are related to each other. By the means of
numerical modellings the results are reproduced and mixing along the estuary is discussed. Beside tidal dominance in the
Elbe estuary discharge variations on monthly to seasonal timescales modify the freshwater related transport processes.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Managing deltas
Date Published : 19/08/2015
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