Abstract
ABSTRACT: The seasonal Kendall test is used for detecting water‐quality trend or lack of trend for monthly data of 15 water‐quality constituents at 15 sampling stations in the Arkansas River, the Neosho River, and the Verdigris River basins. Trends of individual constituents and the trends of the first four principal components for the correlation matrix of water‐quality data at each station are determined, and the relationships between the trends of constituents and the trends of principal components are established. Using the principal components not only reduces the high dimensionality of the original data to a few principal components, but also presents an overall picture of water‐quality trend of these river basins.
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