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- W2319312986 abstract "Evaluating streamflow changes is one of the most important tasks in hydrology, which provides significant insight regarding the trends that occur in streamflow due to climate variability and change. This study focused on investigating the presence of gradual changes (trends) and abrupt changes (shifts) in 240 unimpaired streamflow stations across the continental United States. Discrete Wavelet Transform (DWT) was used as the trend detection method, which is one of the techniques used in Spectral Analysis. The changes in streamflow in water-year were analyzed along with three dyadic scales (1year, 2 years and 4 years) for 60 years i.e., 1951-2010. The non-parametric Mann-Kendall test was used to identify the trends, whereas the non-parametric Pettitt test was used to identify the shifts. The results showed a significant increase in streamflow in the Northeast and Midwest (Upper Mississippi and Ohio) regions and a decrease in the Pacific Northwest region. The central regions, especially Missouri, had mixed results with a propensity towards increasing trends. The southern U.S. regions did not show any overall significant trends. The shifts were found to be more spatially dispersed and were in agreement with the gradual trends. More stations showed trends and shifts with increasing time scales, which implies the presence of periodic occurrences at 4 years or higher. The presence of persistence was also observed to increase with the increasing time-scales. The results from the current study may assist water managers to efficiently plan and manage the water resources under changing climatic conditions." @default.
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- W2319312986 date "2015-05-14" @default.
- W2319312986 modified "2023-09-30" @default.
- W2319312986 title "Spectral Analysis of Streamflow for Continental U.S.A." @default.
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- W2319312986 doi "https://doi.org/10.1061/9780784479162.112" @default.
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