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| Titel |
A daily salt balance model for stream salinity generation processes following partial clearing from forest to pasture |
| VerfasserIn |
M. A. Bari, K. R. J. Smettem |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 10, no. 4 ; Nr. 10, no. 4 (2006-07-11), S.519-534 |
| Datensatznummer |
250008139
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| Publikation (Nr.) |
 copernicus.org/hess-10-519-2006.pdf |
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| Zusammenfassung |
| We developed a coupled salt and water balance model to represent the stream
salinity generation process following land use changes. The conceptual model
consists of three main components with five stores: (i) Dry, Wet and
Subsurface Stores, (ii) a saturated Groundwater Store and (iii) a transient
Stream zone Store. The Dry and Wet Stores represent the salt and water
movement in the unsaturated zone and also the near-stream dynamic saturated
areas, responsible for the generation of salt flux associated with surface
runoff and interflow. The unsaturated Subsurface Store represents the salt
bulge and the salt fluxes. The Groundwater Store comes into play when the
groundwater level is at or above the stream invert and quantifies the salt
fluxes to the Stream zone Store. In the stream zone module, we consider a
"free mixing" between the salt brought about by surface runoff, interflow
and groundwater flow. Salt accumulation on the surface due to evaporation
and its flushing by initial winter flow is also incorporated in the Stream
zone Store. The salt balance model was calibrated sequentially following
successful application of the water balance model. Initial salt stores were
estimated from measured salt profile data. We incorporated two lumped
parameters to represent the complex chemical processes like
diffusion-dilution-dispersion and salt fluxes due to preferential flow. The
model has performed very well in simulating stream salinity generation
processes observed at Ernies and Lemon experimental catchments in south west
of Western Australia. The simulated and observed stream salinity and salt
loads compare very well throughout the study period with NSE of 0.7 and 0.4
for Ernies and Lemon catchment respectively. The model slightly over
predicted annual stream salt load by 6.2% and 6.8%. |
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