Trend Analysis of Streamflow Drought Events in Nebraska

A streamflow drought event, defined by applying the threshold level approach on streamflow time series, is composed of three parameters: duration, severity and magnitude. This study reveals statistical characteristics on streamflow drought event parameters and detects spatial and temporal trends in...

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Bibliographic Details
Published in:Water resources management 2008-02, Vol.22 (2), p.145-164
Main Authors: Wu, Hong, Soh, Leen-Kiat, Samal, Ashok, Chen, Xun-Hong
Format: Article
Language:English
Subjects:
Aquifers
Atmospheric Sciences
Civil Engineering
Creeks & streams
Drought
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environment
Exact sciences and technology
Geotechnical Engineering & Applied Earth Sciences
Groundwater
Hydrogeology
Hydrology
Hydrology. Hydrogeology
Hydrology/Water Resources
Irrigation
Pollution, environment geology
Precipitation
Rivers
statistics
Stream discharge
Stream flow
Studies
surface water
Time series
time series analysis
trend
Trends
Water resources
Water shortages
Watersheds
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Summary:A streamflow drought event, defined by applying the threshold level approach on streamflow time series, is composed of three parameters: duration, severity and magnitude. This study reveals statistical characteristics on streamflow drought event parameters and detects spatial and temporal trends in the streamflow drought in terms of frequency, duration and severity in Nebraska. The studies are conducted on three time periods: 1970-2001 (60 stations), 1950-2001 (43 stations), and 1932-2001 (9 stations). The statistical tests performed on the drought event parameters include correlation between event parameters tests, Hurst coefficients and lag-one coefficients, and trend-free pre-whitening Mann-Kendall (TFPW-MK) tests. The analysis shows that there is no uniform trend on the streamflow drought in the whole state. However, some trends are evident for specific regions. Specifically, it is most likely that droughts in the Republican watershed have become more intense; whereas the drought has become slightly alleviated in the Missouri and nearby watersheds.
ISSN:0920-4741
1573-1650
DOI:10.1007/s11269-006-9148-6