Re-evaluate all transpiration coefficients

[kpalmqui]

Revisit the transpiration coefficients for each functional type held in soils.in and make sure they are accurate and reasonable for the vegetation represented in STEPWAT2.

[dschlaep]

I don't use the default transpiration coefficient values in SOILWAT2s testing folder for any simulation project. I only use them as code example and code testing. I haven't checked them for a long time; they may likely need adjustments to properly represent current's STEPWAT2 representation.

rSFSW2 always pulls it's own values based on vegetation cover and soil depth using it's spreadsheet 1_Input/treatments/LookupTranspCoefs/TranspirationCoefs_v2.csv (in the data-raw folder of the source package) and passes them to the function rSOILWAT2::TranspCoeffByVegType. The values in the spreadsheet are based on different sources (see spreadsheet), but the ones I mostly use are derived from Schenk & Jackson 2003.

Schenk, H. J., and R. B. Jackson. 2003. Global distribution of root profiles in terrestrial ecosystems. Data set. doi:10.3334/ORNLDAAC/660. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.

[kpalmqui]

@dschlaep thanks very much for the quick reply! I will re-evaluate our current transpiration coefficients based on TranspirationCoefs_v2 (and the depths and plant functional types we are representing).

[dschlaep]

Let me know if I can help interpret the spreadsheet!

On Mar 4, 2020, at 19:51, Kyle Palmquist notifications@github.com wrote:

@dschlaep https://github.com/dschlaep thanks very much for the quick reply! I will re-evaluate our current transpiration coefficients based on TranspirationCoefs_v2 (and the depths and plant functional types we are representing).

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[kpalmqui]

@dschlaep thanks! for a layer that represents 0 to 10 cm, I averaged the individual cm values from 1 to 10 cm depth from the appropriate Schenk & Jackson 2003 column.

Is that the proper intepretation and application of these values?

[dschlaep]

The values should be summed per layer, and then normalized across the profile, see rSOILWAT2::TranspCoeffByVegType.

[kpalmqui]

@dschlaep thank you for the additional clarification!!

[kpalmqui]

Here are the update transp coeffs:

new_transp_coeffs.xlsx

[kpalmqui]

resolved by https://github.com/DrylandEcology/STEPWAT2/commit/b07d5e80671b18ce99e94d0e158c357c1705a01b