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Geostatistical features of streambed vertical hydraulic conductivities in Frenchman Creek Watershed in Western Nebraska
Hydrological Processes ( IF 3.2 ) Pub Date : 2020-06-21 , DOI: 10.1002/hyp.13823
Olufemi P. Abimbola 1 , Aaron R. Mittelstet 1 , Troy E. Gilmore 1, 2
Affiliation  

This study evaluated the spatial variability of streambed vertical hydraulic conductivity (Kv) in different stream morphologies in the Frenchman Creek Watershed, Western Nebraska, using different variogram models. Streambed Kv values were determined in situ using permeameter tests at 10 sites in Frenchman, Stinking Water and Spring Creeks during the dry season at baseflow conditions. Measurements were taken both in straight and meandering stream channels during a 5 day period at similar flow conditions. Each test site comprised of at least three transects and each transect comprised of at least three Kv measurements. Linear, Gaussian, exponential and spherical variogram models were used with Kriging gridding method for the 10 sites. As a goodness‐of‐fit statistic for the variogram models, cross‐validation results showed differences in the median absolute deviation and the standard deviation of the cross‐validation residuals. Results show that using the geometric means of the 10 sites for gridding performs better than using either all the Kv values from the 93 permeameter tests or 10 Kv values from the middle transects and centre permeameters. Incorporating both the spatial variability and the uncertainty involved in the measurement at a reach segment can yield more accurate grid results that can be useful in calibrating Kv at watershed or sub‐watershed scales in distributed hydrological models.

中文翻译:

内布拉斯加州西部弗朗西曼克里克流域的河床垂直水力传导率的地统计特征

这项研究使用不同的变异函数模型评估了内布拉斯加州西部弗朗西曼克里克流域在不同河流形态下河床垂直水力传导率(K v)的空间变异性。在基流条件下的干旱季节,在法国人,臭水和斯普林克里克的10个地点使用渗透计测试现场测定了河床的K v值。在相似的流量条件下,在5天的时间内在直流和蜿蜒的水流通道中进行了测量。每个测试位点至少包含三个样点,每个样点至少包含三个K v测量。线性,高斯,指数和球面变异函数模型与Kriging网格法一起用于10个地点。作为变异函数模型的拟合优度统计,交叉验证的结果表明,交叉验证残差的中位数绝对偏差和标准偏差有所不同。结果表明,使用10个位置的几何平均值进行网格划分的效果要好于使用93个渗透仪测试的所有K v值或使用中样线和中心渗透仪的10 K v值。结合在到达段的测量中涉及的空间变异性和不确定性可以产生更准确的网格结果,这对于校准K v很有用 在分布式水文模型中的分水岭或分水岭规模。
更新日期:2020-06-21
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