Effective Hydraulic Properties Determined from Transient Unsaturated Flow in Anisotropic Soils
Journal Article
·
· Vadose Zone Journal, 6(4):913-924
Hydraulic parameters including the pore connectivity/tortuosity tensor (L_i) were inversely estimated using the STOMP numerical simulator coupled with the parameter estimation code, UCODE. Results show that six of eight parameters required for a modified van Genuchten-Mualem model could be inversely estimated using water content measured during transient infiltration from a surface line source and approximated prior information. Soils showed evidence of saturation-dependent anisotropy that was well described with the connectivity tensor. Variability of the vertical saturated hydraulic conductivity was larger than the horizontal. The autocorrelation ranges for the horizonatal and vertical Ks; the inverse of the air-entry value, and the horizontal connectivity were between 2.4 and 4.6 m whereas the van Genuchten shape parameter, n, and saturated water content showed no autocorrelation. Accurate upscaling of hydraulic properties requires the correct assessment of the connectivity of facies.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 924678
- Report Number(s):
- PNNL-SA-55334; 25448; 830403000
- Journal Information:
- Vadose Zone Journal, 6(4):913-924, Journal Name: Vadose Zone Journal, 6(4):913-924 Journal Issue: 4 Vol. 6
- Country of Publication:
- United States
- Language:
- English
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