IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 1- MANAGING DELTAS : FRESHWATER RELATED TRANSPORT PROCESSES IN THE ELBE ESTUARY
FRESHWATER RELATED TRANSPORT PROCESSES IN THE ELBE ESTUARY
Author : HARTMUT HEIN , STEPHAN MAI & ULRICH BARJENBRUCH
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.
File Size : 4,705,650 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 1- MANAGING DELTAS
Date Published : 18/04/2016
Download Now