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| Titel |
Variability of flow discharge in lateral inflow-dominated stream channels |
| VerfasserIn |
C.-M. Chang, H.-D. Yeh |
| 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 ; 19, no. 5 ; Nr. 19, no. 5 (2015-05-27), S.2505-2511 |
| Datensatznummer |
250120723
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| Publikation (Nr.) |
 copernicus.org/hess-19-2505-2015.pdf |
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| Zusammenfassung |
| The influence of the temporal changes in lateral inflow
rate on the discharge variability in stream channels is explored through the
analysis of the diffusion wave equation (i.e. the linearized Saint-Venant
equation). To account for variability and uncertainty, the lateral inflow
rate is regarded as a temporal random function. On the basis of the spectral
representation theory, analytical expressions for the covariance function
and evolutionary power spectral density of the random discharge perturbation
process are derived to quantify variability in stream flow discharge induced
by the temporal changes in lateral inflow rate. The treatment of the
discharge variance (square root of the variance) gives us a quantitative
estimate of uncertainty in predictions from the deterministic model. It is
found that the discharge variability of stream flow is very large in the
downstream reach, indicating large uncertainty anticipated from the use of
the deterministic model. A larger temporal correlation scale of inflow rate
fluctuations, representing more temporal consistency of fluctuations in
inflow rate around the mean, introduces a higher variability in stream flow discharge. |
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