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ABSTRACT
Changes in streamflow magnitudes have ecological, hydrological, and geomorphological implications. Improved knowledge and understanding of the drivers of changes in streamflow conditions remain critical in water resource management. Spatiotemporal patterns of changes in streamflow conditions for five flow percentiles between two comparative periods: historical period (1944–1980) and recent period (1984‒2022) were determined in 18 watersheds of North Carolina Piedmont. The observed percentage changes in streamflow magnitudes for the five flow percentiles were attributed to change magnitudes in monthly mean precipitation and monthly mean temperature using a statistical modeling framework (i.e. gamma regression model). The results showed reduced streamflow magnitudes for the 10th, 25th, 50th, and 75th percentile flows, respectively, while an increased streamflow magnitude was found for the 90th percentile flow at many of the sites in recent period. The regression models captured the relationships between change magnitudes in streamflow conditions and changes in climate variables across all the sites.
Acknowledgments
I am very grateful to my advisor, Dan Royall, PhD, for reading the first draft of this manuscript. His insightful comments and suggestions were greatly helpful in refining the final manuscript. This work also greatly benefitted from the meaningful suggestions of two anonymous reviewers and Dr Steven Quiring.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Data availability statement
The author confirms that the data supporting the findings of this study are available within the article.