27 lines
1.2 KiB
JSON
27 lines
1.2 KiB
JSON
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{
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"model": "van_genuchten_munsterkotte",
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"source": "FAO-56 Appendix IV; Rawls et al. (1982)",
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"author": "Arthur Ibay",
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"location": "Salt Lake City, UT",
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"units": {
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"theta_s": "cm3/cm3",
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"theta_r": "cm3/cm3",
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"alpha": "cm^-1",
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"n": "dimensionless",
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"m": "derived (1-1/n)"
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},
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"pedotransfer_functions": {
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"sand": {"theta_s":0.425,"theta_r":0.065,"alpha":0.037,"n":2.12,"bd_base":1.55,"om_coef":0.008},
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"loamy_sand": {"theta_s":0.410,"theta_r":0.075,"alpha":0.045,"n":1.95,"bd_base":1.50,"om_coef":0.009},
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"sandy_loam": {"theta_s":0.405,"theta_r":0.085,"alpha":0.052,"n":1.88,"bd_base":1.45,"om_coef":0.010},
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"loam": {"theta_s":0.400,"theta_r":0.095,"alpha":0.060,"n":1.80,"bd_base":1.35,"om_coef":0.011},
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"silt_loam": {"theta_s":0.395,"theta_r":0.105,"alpha":0.070,"n":1.72,"bd_base":1.30,"om_coef":0.012},
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"clay_loam": {"theta_s":0.385,"theta_r":0.120,"alpha":0.082,"n":1.62,"bd_base":1.25,"om_coef":0.013},
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"clay": {"theta_s":0.375,"theta_r":0.135,"alpha":0.095,"n":1.52,"bd_base":1.20,"om_coef":0.014}
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},
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"adjustments": {
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"bulk_density_correction": "(bd_base - bd_measured) * 0.02",
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"organic_matter_correction": "theta_s += om_pct * om_coef; theta_r *= (1 - om_pct * 0.005)"
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}
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}
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