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Irrigation mask

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shaider2

New member
Hi,
I am doing a seasonal run and I am using irrigation scheme for my control run. For my experiment I want to replace the grid cells which are irrigated with grassland. I wanted to know how does WRF creates the Irrigation mask. Is it just the grid cells with irrigated cropland (LU_INDEX = 3)? Or does they use any other parameter for selecting irrigation mask.
 
Hi, where is your study domain? and Are you using the irrigation scheme in NoahMP LSM?

For USGS land use type, irrigation will be on with LU_INDEX between 3~6, and for MODIS land use type, irrigation will be on with LU_INDEX = 12 or 14:
github.com

noahmp/src/module_sf_noahmplsm.F at e5c0859874407859936739e8be8741f9aed369ee · NCAR/noahmp

Noah-MP Community Repository. Contribute to NCAR/noahmp development by creating an account on GitHub.
github.com github.com

And there are some irrigation-related variables needed in wrfinput file: IRFRACT (irrigation fraction), and NoahMP will determine if it will irrigate based on this irrigation fraction. There are three types of irrigation method, flood irrigation, sprinkler irrigation and micro irrigation, each method has a fraction in the wrfinput file: FIFRACT (flood), SIFRACT (spinkler) and MIFRACT (micro).

Then the irrigation scheme is called, depending on the grid cell irrigation fraction, and irrigation methods for that grid cell:
github.com

noahmp/src/module_sf_noahmplsm.F at e5c0859874407859936739e8be8741f9aed369ee · NCAR/noahmp

Noah-MP Community Repository. Contribute to NCAR/noahmp development by creating an account on GitHub.
github.com github.com
 
Hi,
Thanks! it is very helpful. My study area is Nebraska and I'm using noah lsm. Does that have similar criteria for LU_index. I am asking as a large portion of dryland cropland has high irrigation fraction.
 
shaider2 said:
Hi,
Thanks! it is very helpful. My study area is Nebraska and I'm using noah lsm. Does that have similar criteria for LU_index. I am asking as a large portion of dryland cropland has high irrigation fraction.
Click to expand...
You may check between LU_INDEX=3 and irrigation fraction, are they consistent or very different.
For Noahmp, if the LU_INDEX=3, but with very small irrigation fraction, the irrigation water sill be small.
 
zhezhang said:
You may check between LU_INDEX=3 and irrigation fraction, are they consistent or very different.
For Noahmp, if the LU_INDEX=3, but with very small irrigation fraction, the irrigation water sill be small.
Click to expand...

zhezhang said:
For Noah lsm, you may check out this line:
github.com

WRF/phys/module_sf_noahlsm.F at f52c197ed39d12e087d02c50f412d90d418f6186 · wrf-model/WRF

The official repository for the Weather Research and Forecasting (WRF) model - wrf-model/WRF
github.com github.com
Click to expand...
Is there any technical documentation for this one? I have already found the technical documentation for Naohmplsm. Thank you so much for that
 
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