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| Titel |
Quantifying spatial and temporal discharge dynamics of an event in a first order stream, using distributed temperature sensing |
| VerfasserIn |
M. C. Westhoff, T. A. Bogaard, H. H. G. Savenije |
| 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 ; 15, no. 6 ; Nr. 15, no. 6 (2011-06-24), S.1945-1957 |
| Datensatznummer |
250012862
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| Publikation (Nr.) |
 copernicus.org/hess-15-1945-2011.pdf |
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| Zusammenfassung |
| Understanding the spatial distribution of discharge can be important for water
quality and quantity modeling. Non-steady flood waves can, particularly as a result of short high
intensity summer rainstorms, influence small
headwater streams significantly. The aim of this paper is to quantify the spatial
and temporal dynamics of stream flow in a headwater stream during a summer
rainstorm. These dynamics include gains and losses of stream water, the
effect of bypasses that become active and hyporheic exchange fluxes that may
vary over time as a function of discharge. We use an advection-dispersion
model coupled with an energy balance model to simulate in-stream water
temperature, which we compare with high resolution temperature observations
obtained with Distributed Temperature Sensing. This model was used as a
learning tool to stepwise unravel the complex puzzle of in-stream processes
subject to varying discharge. Hypotheses were tested and rejected, which led
to more insight in the spatial and temporal dynamics in discharge and hyporheic
exchange processes. We showed that, for the studied stream infiltration losses
increase during a small rain
event, while gains of water remained constant over time. We conclude that,
eventually, part of the stream water bypassed the main channel during peak
discharge. It also seems that hyporheic exchange varies with varying
discharge in the first 250 m of the stream; while further downstream it
remains constant. Because we relied on solar radiation as the main energy
input, we were only able to apply this method during a small summer storm and low
flow conditions. However, when additional (artificial) energy is available, the
presented method is also applicable in larger streams, during higher flow
conditions or longer storms. |
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