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| Titel |
Geomorphology-based index for detecting minimal flood stages in arid alluvial streams |
| VerfasserIn |
E. Shamir, L. Ben-Moshe, A. Ronen, T. Grodek, Y. Enzel, K. P. Georgakakos, E. Morin |
| 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 ; 17, no. 3 ; Nr. 17, no. 3 (2013-03-07), S.1021-1034 |
| Datensatznummer |
250018820
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| Publikation (Nr.) |
 copernicus.org/hess-17-1021-2013.pdf |
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| Zusammenfassung |
| Identification of a geomorphic index to represent lower thresholds for minor
flows in ephemeral, alluvial streams in arid environments is an essential
step as a precursor for reliable flash flood hazard estimations and
establishing flood warning systems. An index, termed Alluvial wadi Flood
Incipient Geomorphologic Index (AFIG), is presented. Analysis of data from
an extensive field survey in the arid ephemeral streams in southern and
eastern Israel was conducted to investigate the AFIG and the control over
its value across the region. During the survey we identified distinguishable
flow marks in the lower parts of streams' banks, such as niches, vegetation
line, and change in bank material, which are indicative of low flows. The
cross-sectional characteristics of the AFIG were studied in relationship
with contributing drainage basin characteristics such as lithology,
topography, and precipitation. Drainage area and hardness of the exposed
lithology (presented as a basin-wide index) are the preferred descriptors to
be used in estimating a specific AFIG in unsurveyed sites. Analyses of
discharge records from seven hydrometric stations indicate that the
recurrence interval of the determined AFIG is equal to or more frequent than
0.5 yr. |
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