tmax_adj (nhru)

PRMS Parameter Name(s): tmax_adj

BAGIS-P Model Toolbox: bagis_p_climate_methods.tbx

BAGIS-P Model Name: Temp_Adj_Max

Field Name(s):

• tmax_adj

Parameter Description: Derives max temperature (F) adjustment from aspect grid using a different method:

tmax_adj = -1.8 cos(hru_aspect * 0.0175)

This method is recommended on the USGS PRMS parameterization tutorial website. The units are degrees F, and should be F even if your inputs are in C and you have set the temp_units flag accordingly.

Methods:

• 1. Convert input aspect raster to an integer layer by truncation using Int.

  2. Calculate the MEDIAN aspect for each HRU using Zonal Statistics as Table.

  3. Copy the MEDIAN field to the parameter table using Join Field.

  4. Add Field, “fld_tmax_adj”, to the parameter table.

  5. Use Calculate Field to assign values from the MEDIAN field to “fld_tmax_adj” with the following expression:

-1.8 * cos( [MEDIAN] * 0.0174533).

• 1. Delete old MEDIAN field. Update the parameter table.

BAGIS-P GUI Example: