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A one-dimensional mixing and flushing model of the Ems-Dollard estuary: calculation of time scales at different river discharges
Helder, W.; Ruardij, P. (1982). A one-dimensional mixing and flushing model of the Ems-Dollard estuary: calculation of time scales at different river discharges. Neth. J. Sea Res. 15(3-4): 293-312
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Helder, W.
  • Ruardij, P.

Abstract
    Setting from longitudinal salinity distributions over the years 1970 to 1977 it was shown that the flushing time decreases with increasing river flow. At average discharge the flushing time of Ems water was found to be 38 days and that of Westerwoldse Aa water within the Dollard 14 days. By segmentation of the Ems-Dollard estuary in 17 compartments a box model was constructed that can be used to predict the dispersion of water and dissolved constituents. Comparison of the distribution of water types (Ems water, WWA water, and sea water) as calculated by the box model are in agreement with independent calculations from using fluorescence (by yellow substance) and salinity as tracers. Comparison of model-predicted and measured salinity distribution show reasonable agreement. Turn-over times, mean ages and residence times are calculated and it is shown that these time scales vary with fresh water discharge too.

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