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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Climate variability and changes in streamflow and precipitation extremes
Climate variability and changes in streamflow and precipitation extremes
Author : RAMESH S. V. TEEGAVARAPU
ABSTRACT
Evaluation of the influences of coupled oceanic-atmospheric oscillations affecting streamflow and precipitation extremes
and characteristics at a regional scale is the focus of this study. Two oscillations considered in this study and they are:
Atlantic multidecadal oscillation (AMO), El Nino southern oscillation (ENSO). The study area is the South-Atlantic Gulf region
of the U.S. Several standard low flow indices, streamflow deficit durations, temporal occurrences of these deficits and other
characteristics of low flow extremes during two different phases of these oscillations are evaluated. Higher end streamflow
and precipitation extremes are also evaluated using several extreme indices. Variability of streamflows and precipitation
extremes are evaluated using a joint probability approach. Long-term precipitation and streamflow data from 45 Hydro-
Climatic Data Network (HCDN) basins that are least distributed by anthropogenic influences are used for evaluation.
Parametric hypothesis tests are used to evaluate statistically significant changes in the characteristics of low and high flows
and precipitation extremes. Inferences about influences of oscillations on droughts/floods from the results of statistical
analysis and possible physical basis explanations are expected outcomes of this study. Evaluation and understanding of
changes in frequency and intensity (severity) of droughts as well as floods conditioned on precipitation extremes and their
links to climate variability are critical for basin scale water resources management. Spatially varying (uniform and nonuniform
influences of oscillations on streamflow and precipitation extremes are noted. Regional climatology defines the
extent of these influences in the region.
File Size : 1,142,797 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
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