Statistical and geostatistical features of streambed hydraulic conductivities in the Platte River, Nebraska

被引:47
作者
Chen, XH [1 ]
机构
[1] Univ Nebraska, Sch Nat Resources, Lincoln, NE 68588 USA
来源
ENVIRONMENTAL GEOLOGY | 2005年 / 48卷 / 06期
关键词
streambed; permeameter test; hydraulic conductivity; variogram models; Platte River;
D O I
10.1007/s00254-005-0007-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This paper presents streambed hydraulic conductivities of the Platte River from south-central to eastern Nebraska. The hydraulic conductivities were determined from river channels using permeameter tests. The vertical hydraulic conductivities (K-v) from seven test sites along this river in south-central Nebraska belong to one statistical population. Its mean value is 40.2 m/d. However, the vertical hydraulic conductivities along four transects of the Ashland test site in eastern Nebraska have lower mean values, are statistically different from the K-v values in south-central Nebraska, and belong to two different populations with mean values of 20.7 and 9.1 m/d, respectively. Finer sediments carried from the Loup River and Elkhorn River watersheds to the eastern reach of the Platte River lowers the vertical hydraulic conductivity of the streambed. Correlation coefficients between water depth and K-v values along a test transect indicates a positive correlation - a larger K-v usually occurs in the part of channel with deeper water. Experimental variograms derived from the vertical hydraulic conductivities for several transects across the channels of the Platte River show periodicity of spatial correlation, which likely result from periodic variation of water depth across the channels. The sandy to gravelly streambed contains very local silt and clay layers; spatially continuous low-permeability streambed was not observed in the river channels. The horizontal hydraulic conductivities were larger than the vertical hydraulic conductivities for the same test locations.
引用
收藏
页码:693 / 701
页数:9
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