Journal
COMPUTERS & GEOSCIENCES
Volume 37, Issue 8, Pages 1148-1161Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cageo.2010.07.007
Keywords
Models; Particle tracking; Residence time; Age; Freshwater discharge; Salinity; Currents
Funding
- Taiwan's National Science Council [96-2628-E-239-012-MY3]
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A three-dimensional hydrodynamic model that includes a Lagrangian particle-tracking simulation was applied to the Danshuei River estuarine system in northern Taiwan. The model's accuracy was validated with data from 1999: the results from the model agreed well with empirical observations of water surface elevation, tidal currents, and salinity. The validated model was then used to investigate the residence time and water age in response to different levels of freshwater discharge. A regression analysis of the model results revealed that an exponential equation best explained the correlation between residence time and freshwater input. We found that the residence times during the low and high freshwater discharge episodes were 4.4 and 2.5 days, respectively. The water age during the low-flow periods was greater than that during the high-flow periods. The modelled residence time and water age values without density-induced circulation were higher than those with density-induced circulation, which indicates that density-induced estuarine circulation may play a significant role in the estuary. (C) 2010 Elsevier Ltd. All rights reserved.
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