snow_water_equivalence

hydrometlib.cosmos.snow_water_equivalence(cts_smo, cts_est, n0_mod)

Calculate snow water equivalence (SWE) for an above ground COSMOS sensor [mm water equivalent]

\[SWE = -\Lambda \, \ln\!\left( \frac{C_{smo} - N_{wat}}{C_{est} - N_{wat}} \right), \qquad \Lambda = 48, \quad N_{wat} = 0.38 \, N_0\]

where \(N_0\) is n0_mod.

References

• Wallbank J. R., Cole S. J., Moore R. J., Anderson S. R., Mellor E. J. (2020),

  Estimating snow water equivalent using cosmic-ray neutron sensors from the COSMOS-UK network, Hydrological Processes, 35(5), e14048. https://doi.org/10.1002/hyp.14048

• Desilets, D. (2017). Calibrating a non-invasive cosmic ray soil moisture probe for snow water equivalent.

  Hydroinnova Technical Document 17-01.

Parameters:

• cts_smo (Expr) – Smoothed neutron counts, corrected for influences on cosmic-ray intensity [counts h-1]

• cts_est (Expr) – Estimated counts during snow periods [counts h-1]

• n0_mod (Expr) – Site attribute of a calibration coefficient obtained from field calibration [counts h-1]

Return type:

Expr

Returns:

Expression or Series for SWE [mm water equivalent]