DQRID : D041004.4
Start DateStart TimeEnd DateEnd Time
10/11/2001150009/28/20041509
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Subject:
SGP/EBBR/E15 - Soil Moisture Coefficients Incorrect
DataStreams:sgp30ebbrE15.b1
Description:
The soil Moisture coefficients used for E15 were incorrect from the time of
installation of the system in program version 8.  On 9 July 02 parameter 4  (an offset 
value) of program step 136 was changed from 9.5264 to the correct value 0.95264 (this error 
had been made by the vendor). The error masked the real problem (wrong soil type) and 
after 9 July 02 resulted in very low soil moisture measurements.  The coefficients used were 
for coarse sand.  On 28 Sep 04 I visited the E15 site and found the soil type a fine 
sandy clay or fine sandy loam.  I changed the coefficients  at 1509 GMT to those for a very 
fine sandy loam; this produced reasonable soil moistures for the soil type.

The old coefficients in parameters 4 through 9 for step 136 of the program were: 0.95264, 
-6.7859, 36.224, -58.619, 25.073, 4.2278

The new coefficients are: 10.241, -27.943, 49.523, -12.648, -52.643, 38.054
Suggestions: 
null
Measurements:sgp30ebbrE15.b1:
  • Soil moisture 1, gravimetric(soil_moisture_1)
  • Soil moisture 2, gravimetric(soil_moisture_2)
  • Change in energy storage 1, 0-5 cm soil layer(energy_storage_change_1)
  • Soil moisture 3, gravimetric(soil_moisture_3)
  • Soil moisture 4, gravimetric(soil_moisture_4)
  • Soil moisture 5, gravimetric(soil_moisture_5)
  • Change in energy storage 3, 0-5 cm soil layer(energy_storage_change_3)
  • Change in energy storage 2, 0-5 cm soil layer(energy_storage_change_2)
  • Change in energy storage 5, 0-5 cm soil layer(energy_storage_change_5)
  • Change in energy storage 4, 0-5 cm soil layer(energy_storage_change_4)
  • Surface latent heat flux(latent_heat_flux)
  • Surface soil heat flux 5(surface_soil_heat_flux_5)
  • Surface sensible heat flux(sensible_heat_flux)
  • Surface soil heat flux 3(surface_soil_heat_flux_3)
  • Surface soil heat flux 4(surface_soil_heat_flux_4)
  • Surface soil heat flux 1(surface_soil_heat_flux_1)
  • Surface soil heat flux 2(surface_soil_heat_flux_2)
  • Surface soil heat flux, average of fluxes 1-5(surface_soil_heat_flux_avg)
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