Upstream-Downstream Relationships in Terms of Annual Streamflow Discharges and Drought Events in Nebraska
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Abstract
Upstream-downstream relationships of annual streamflow discharges and severity and frequency of stream-flow drought events are critical in understanding how streamflow droughts propagate over time and space. Such information can be used to resolve water disputes, trigger mitigation strategies, and understand how streamflow changes due to changes in the environment. During drought years, such information is even more critical as water resources are contested. The objective of this research is to study the upstream-downstream relationships of streamflow in Nebraska along four major river systems with diverse hydrologic characteris-tics and human activities: North Platte, Big Blue, Republican, and Niobrara. The relationships among the upstream and downstream stations along the four rivers are investigated by comparing several statistics de-rived from the annual flow discharge and on drought events. Trend analysis and coefficient of variation are applied to annual flow discharge values, and a host of drought-related parameters (e.g., annual maximum drought duration, annual accumulated drought duration, number of drought events) are also computed with respect to five different levels of streamflow drought events: water shortage, mild drought, moderate drought, significant drought, and extreme drought. The paired-t test and ANOVA with MIXED procedure are subse-quently applied to the statistics to observe whether there is a significant difference between upstream and downstream stations along a river. The analysis allows us to characterize the upstream-downstream relation-ships of the four river systems, laying the groundwork for further investigations to identify the reasons for some of the trends and observations. These findings will be essential in water resources management during or prior to hydrological droughts.
- T. F. Homer-Dixon, “Strategies for studying causation in complex ecological political systems,” Occasional Paper, The Myth of Global Water Wars.
- C. A. Flowerday, Ed., “Flat water: A history of nebraska and its water, conservation and survey division institute of agricultural and natural resources,” University of Nebraska-Lincoln, Resource Report, No. 12.
- H. Hisdal and L. M. Tallaksen, Eds., “Assessment of the regional impact of droughts in Europe,” Drought Event Definition,Technical Report, No. 6, pp. 41, 2002.
- M. P. Lawson, A. Reiss, R. Phillips, and K. Livingston, “Nebraska droughts: A study of their past chronological and spatial extent with implications for the future,” Occasional Papers, Department of Geography, University of Nebraska- Lincoln, No. 1, pp. 147, 1971.
- L. B. Leopold, “A view of the river,” Harvard University Press, Cambridge, MA, pp. 298, 1994.
- H. F. Lins and J. R. Slack, “Streamflow trends in the United States,” Geophysical Research Letters, Vol. 26, No. 2, pp. 227?230, 1999.
- M. A. Miah, “Man-made climatic changes in the Ganges basin,” International Journal of Climatology, Vol. 22, pp. 993?1016, 2002.
- R. Neff, H. Chang, C. G. Knight, R. G. Najjar, B. Yarnal, and H. A. Walker, “Impact of climate variation and change on Mid-Atlantic region hydrology and water resources,” Climate Research, Vol. 14, pp. 207?218, 2000.
- C. Revenga, S. Murray, J. Abramovitz, and A. Hammond, “Watersheds of the world: Ecological value and vulnerability,” World Resources Institute and Worldwatch Institute, Washington DC, 1998.
- D. A. Wilhite, “Government response to drought in the United States: With particular reference to the Great Plains,” Journal of Climate and Applied Meteorology, Vol. 22, pp. 40?50, 1983.
- V. Yevjevich, “An objective approach to definition and investigation of continental hydrologic droughts,” Hydrology Paper, Colorado State University, Fort Collins, Colorado, 1967.
- E. Zelenhasic and A. Salwai, “A method of streamflow drought analysis,” Water Resources Research, Vol. 23, No. 1, pp. 156?168, 1987.
- Nebraska Agricultural Statistics Service, http://www.agr. state.ne.us/agstats/cropwthr.htm (accessed in 2009).
- F. J. Wen and X. H. Chen, “Evaluation of the impact of groundwater irrigation on streamflow depletion in Nebraska,” Journal of Hydrology, Vol. 327, pp. 603?617, 2006.