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• W3163644906 endingPage "126474" @default.
• W3163644906 startingPage "126474" @default.
• W3163644906 abstract "Spatial geostatistical interpolation of point measurements of streambed attributes in the hyporheic zone may be constrained by the streambed anisotropy, and data density and spatial distribution may significantly impact the results. Spatial clustering and low spatial data density can be caused by bedrock outcropping at the streambed limiting installation of in-stream piezometers. This study examines parameter error variability of the geostatistical interpolation using anisotropic interpolation methods and increasing the data density by adding left censored values (i.e., data below measurement limit) to locations where measurements were limited by exposed bedrock lining the streambed. The reduction in relative standard error of the interpolation was determined for the spatial distributions of streambed attributes including hydraulic conductivity, seepage flux, and mercury solute flux measured in two different years along a study reach in East Fork Poplar Creek, Tennessee, USA. Two methods to impute the left censored values were compared including the conventional half the detection limit substitution method, and the Stochastic Approximation of Expectation-Maximization (SAEM) algorithm, which both had comparable results. Imputing left censored data increased the data density to recommended ranges, reduced data clustering, increased the spatial dependence for some attributes, and reduced the standard error for each of the three attributes. For the reach considered herein, addition of the left censored values resulted in a larger error reduction than the consideration of anisotropy within the interpolation, which confirms the benefit of data addition to increase data density within data-limited river corridors." @default.
• W3163644906 created "2021-05-24" @default.
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• W3163644906 date "2021-08-01" @default.
• W3163644906 modified "2023-10-16" @default.
• W3163644906 title "Geostatistical interpolation of streambed hydrologic attributes with addition of left censored data and anisotropy" @default.
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• W3163644906 doi "https://doi.org/10.1016/j.jhydrol.2021.126474" @default.
• W3163644906 hasPublicationYear "2021" @default.
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