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Urban Multi-scale Environmental Predictor
https://umep-docs.readthedocs.io/
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SUEWS 2018b - how to correctly simulate external water use #81

Closed sunt05 closed 5 years ago

sunt05 commented 5 years ago

Original report by rary2013 (Bitbucket: rary2013, ).

The original report had attachments: Irrig_Sim.7z

Hi Ting

I have been through innumerable permutations to correctly simulate external irrigation. But still unsuccessful. LUCY Qf works (emissionsmethod = 0) but waterusemethod = 1 fails. The hourly "Irr" output is false, where it seems 0 is substituted by 999. It gets worse if the output is 10 min intervals.

If you have some time and the inclination, would it be possible for you to run the attached simulation?

It is all set up to run. It is a shortened version of the test simulation's input files, using alternative lat:lon values. Time interval: 10 min Date: 10 Apr 2007 to 27 Oct 2007 (DOY 100 - 300)

The main purpose would be to find where I am incorrectly setting it up for irrigation. Once I have the correct method, then I am good to go forward.

Thanks for any assistance!

sunt05 commented 5 years ago

Original comment by Ting SUN (Bitbucket: sunt05, GitHub: sunt05).

Hi, the issue is simple: you chose/set an inappropriate irrigation configuration in your SUEWS_Irrigation.txt file, where the InternalWaterUse was set as an invalid value (-999). This setting led to abnormal irrigation results as:

Irrigation = wuh (external water use set as forcing) - internal_water_use.

So, the solution to your case is to set IrrigationCode to a more realistic one (e.g., 660) in your SUEWS_SiteSelect.txt file.

I admit this is not well documented and we will/should improve this soon. Thanks for your reporting!

sunt05 commented 5 years ago

Original comment by rary2013 (Bitbucket: rary2013, ).

Many thanks Ting! it now seems a better output. Very grateful for you solving this and the clarification!!

And also the reminder: Irrigation = wuh (external water use set as forcing) - internal_water_use

I created several codes in the SUEWS_Irrigation.txt file (670, 671, 99999, 999, -999) and tried all the permutations, based on the SUEWS manual specifiying -999 as the other column values (i.e. waterusemethod=1).

sunt05 commented 5 years ago

Original changes by Ting SUN (Bitbucket: sunt05, GitHub: sunt05).

changed title from "SUEWS 2017b - how to correctly simulate external water use" to "SUEWS 2018b - how to correctly simulate external water use"

sunt05 commented 5 years ago

Original changes by Ting SUN (Bitbucket: sunt05, GitHub: sunt05).

changed state from "new" to "resolved"