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| Titel |
Surfacewater-groundwater interaction inferred from discharge vs. basin area curves |
| VerfasserIn |
Basudev Biswal, Nagesh Kumar |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250082217
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| Zusammenfassung |
| Peak discharge (QP) vs. basin area (A) curves have been studied for long time leading to the
development of some of the promising hydrological response models. In this study we
also analyze discharge vs. basin area curves for recession periods. We denote the
characteristic discharge, Qn, as the discharge observed in the n-th day after a peak,
then for each value of n we analyze Qn vs. A curves, which typically follow a
power law equation of type: QP = Aθn. The exponent θn for n = 0 is known to
take value between 0.5 and 1 (note that Qn = QP for n = 0), and the commonly
accepted theoretical explanation for it is that QP is controlled by width of channel
network and effective rainfall duration. This premise is based on the assumption that
surface flow dominates during a flood event in a basin and that flow velocity is
constant everywhere in the stream network of the basin. As n increases, i.e. during
recession periods, Qn is expected to be controlled by subsurface flow. According to the
geomorphological recession ow model Qn for higher values of n is controlled by
the dynamics of saturated channel network, and for this case the value of θn is
close to 1. Results here show that θn increases and approaches 1 as n increases,
conforming the notion that a transition from surface water dominated flow process to
subsurface water dominated flow process occurs with time during a recession event. |
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