develop another scenario with new land use map base requires uploading data related with the new project and set parameters with new calibrated parameters

I am not sure how it works with SWAT, however based on my experience with other models you just change the land use map or layer, change the crop or vegetation parameters e.g. leaf area, root depth, irrigation etc. Other parameters stays same as in the calibrated and validated model. You can change the climate/weather time series if you want to simulate future or historical land use.

Dear Shima,

Select that applies!

This steps are prompts of the video attached. I Run example SWAT input files for this purpose. See the zipped .MP4 video file attachment side by side. 

Two ways to change the land use and rerun SWAT.

Change the land use map ( time series or changing the spatial detail of the land use map)  OR:

Update the land use in % ( assuming some % increase or decrease in land use for selected sub basins...to account management activities). 

 STEP 1:

Start your step in the HRU analysis for landuse/soil/slope definition ► define and threshold HRU. Remember to update the lookup-table too/ if there is any change in your new land use class.

Follow the same procedure and Run SWAT again. No need to change the climate parameters you need to call though. If you update the existing climate data length and need to account future climate scenarios, you have to use the new input data. 

STEP 2:

But this only works for selected sub basins for % land use change scenario series development; to see the changes in catchment hydrology due to %land use change for selected SWAT sub-basin ( see the steps in the screen record).

OR   go to HRU analysis tab in the ArcSWAT-ArcMap window.

              1. HRU definition           2. Land use refinement

              3. Land use split             4. Add sub land use

               5. Choose whichever applies to you. 

If you want to update the whole catchment once at a time and you have different land use map/ temporal resolution maps/ then you need to follow step 1. 

One thing on top of this!, the changes made during calibration should remain the same for validation.  

You may also use the SWATCUP once running SWAT ( find the SWAT TextInOut folder for the selected scenario and simulation). 

Regards, 

Gebiaw

Dear Gebiaw,

Thanks for informative the description. I will go through them based on the obove-mentioned details and attached file.

Best regards

Shima

You are welcome. Try with the steps and let me know if there is some more to help you. 

Regards, 

Gebiaw

Simply, you can do it in the following ways:

1) keep record of the calibrated parameters which are based on the baseline land use data.

2) Go to HRU analysis in ArcSWAT>> then change only the land use data to the newly prepared land use scenarios. Assuming other inputs are constant if you're looking to see the effect of LUC.

3) Follow similar procedures and Run the model.

4) Alter the parameters based on calibrated/fitted values and rerun the model.

5) Compare the simulated values with baseline to see if there are changes.

Dear Shima,

In addition to the previous information and attachment for land use change scenario you may refer the following paper for calibration validation uncertainty analysis with either of the available SWAT-CUP packages (DOI:10.3390/w9100782).

Regards,

Gebiaw