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| Titel |
Development of streamflow drought severity-duration-frequency curves using the threshold level method |
| VerfasserIn |
J. H. Sung, E.-S. Chung |
| 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 ; 18, no. 9 ; Nr. 18, no. 9 (2014-09-03), S.3341-3351 |
| Datensatznummer |
250120454
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| Publikation (Nr.) |
 copernicus.org/hess-18-3341-2014.pdf |
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| Zusammenfassung |
| This study developed a streamflow drought severity–duration–frequency (SDF)
curve that is analogous to the well-known depth–duration–frequency (DDF)
curve used for rainfall. Severity was defined as the total water deficit
volume to target threshold for a given drought duration. Furthermore, this
study compared the SDF curves of four threshold level methods: fixed,
monthly, daily, and desired yield for water use. The fixed threshold level
in this study is the 70th percentile value (Q70) of the flow
duration curve (FDC), which is compiled using all available daily
streamflows. The monthly threshold level is the monthly varying Q70
values of the monthly FDC. The daily variable threshold is Q70 of the
FDC that was obtained from the antecedent 365 daily streamflows. The
desired-yield threshold that was determined by the central government
consists of domestic, industrial, and agricultural water uses and
environmental in-stream flow. As a result, the durations and severities from
the desired-yield threshold level were completely different from those for
the fixed, monthly and daily levels. In other words, the desired-yield
threshold can identify streamflow droughts using the total water deficit to
the hydrological and socioeconomic targets, whereas the fixed, monthly, and
daily streamflow thresholds derive the deficiencies or anomalies from the
average of the historical streamflow. Based on individual frequency
analyses, the SDF curves for four thresholds were developed to quantify the
relation among the severities, durations, and frequencies. The SDF curves
from the fixed, daily, and monthly thresholds have comparatively short
durations because the annual maximum durations vary from 30 to 96 days,
whereas those from the desired-yield threshold have much longer durations of
up to 270 days. For the additional analysis, the return-period–duration
curve was also derived to quantify the extent of the drought duration. These
curves can be an effective tool to identify streamflow droughts using
severities, durations, and frequencies. |
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