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Determination of the anisotropy of an upper streambed layer in east-central Nebraska, USA |
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| Authors: | Chengpeng Lu Xunhong Chen Gengxin Ou Cheng Cheng Longcang Shu Donghui Cheng Emmanuel Kwame Appiah-Adjei |
| Institution: | 1. College of Hydrology and Water Resources, Hohai University, 410 Yankai Hall, No. 1 Xikang Rd., Nanjing, 210098, China 2. School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE, 68583-0996, USA 3. School of Environmental Science and Engineering, Chang??an University, Xi??an, 710054, China |
| Abstract: | Information on the anisotropy of streambed hydraulic conductivity (K) is a necessity for analyses of water exchange and solute transport in the hyporheic zone. An approach is proposed for the determination of K, developed from existing in-situ permeameter test methods. The approach is based on determination of vertical and horizontal hydraulic conductivity of streambed sediments on-site and eliminates the effects of vertical flow in the hyporheic zone and stream-stage fluctuation, which normally influence in situ permeameter tests. The approach was applied to seven study sites on four tributaries of the Platte River in east-central Nebraska, USA. On-site permeameter tests conducted on about 172 streambed cores for the determination of vertical hydraulic conductivity (K v) and horizontal hydraulic conductivity (K h) at the study sites indicate that the study sites have relatively small anisotropic ratios, ranging from 0.74 to 2.40. The ratios of K h to K v from individual locations within a study site show greater variation than the anisotropic ratios from the mean or median K at each of the study sites. |
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