Dear Canute,

Here is an example lup.dat file, for two land-use changes, one taking place on 1 1 1990 and the other on 1 1 2000 (i.e., 1 January). See the manual for the format of the data files themselves (what I've named Lup1990s,dat and Lup2000s.dat below). I included every hru in the data file, whether its hru_fr value changed or not:

1 1 1 1990 Lup1990s.dat

1 1 1 2000 Lup2000s.dat

For this to work, your model simulation must begin on or before 1 1 1990 -- otherwise it will ignore any land use change.

And -- note that for some reason, the second line also needed to start with a "1". I thought it should be a "2", but when I put that in, I got a floating point error. It took me several hours of trial and error to get these things figured out.

That's the limit of my experience -- things worked for me at this point. Hopefully one of these minor formatting issues is the source of your problem.

(answer by Jim Almendinger)

I hope this may help you.

All the best !

thanks a million!!!

Welcome and Thanks for your appreciation!

Dear all,

How should we define new cropping patterns scenarios for a calibrated validated swat model? Moreover, having future land use maps, how should we use them in the calibrated model?

thanks for the responses.

Best

Shima

S. Swain i need your email contact. Thank you.

Shima Nabinejad you can create different scenarios for new cropping patterns(like continuous corn or corn-soyabean rotations) whose effect you want to analyze (decide your years upto which you want to follow your decided pattern) and if you simply want to check effect of landuse over years, use land use update tool (LUP.dat)

below is a simple script in R for writting "TxtInOut" files and It will generate lup.dat and HRU_FR file automatically

Hello everyone.

Please can you help me because I create the lup.data in ArcSwat and I run the model and in TxtInOut I don't see any change in hru. table for to HRU_FR.

Please can you help me with an explication.

How to create single ArcSWAT project for all land use scenarios to simulate land use change: https://youtu.be/fbrTXXWW3X8

Dear Liem Duy Nguyen ,

Thanks for the video. I just went through it. It would be nice to add in the video description some links to the R scripts and documentation as well.

Also, I am willing to know how the method implemented oin the R script compares to the one published by Par and Saraswat in 2011 (see attached paper).

Also, as an improvement to the R script, I am having ideas. Instead of a linear interpolation of HRU_FR for intermediate years, it would be interesting to have the feature of implementing a custom user function (in R) to interpolate those coefficient as a function of the current year. I'd like to hear your thoughts on this.

Article SWAT2009-LUC: A tool to activate the land use change module ...

For comparing the HRUs I code a Pandas Python Code: https://github.com/MohsenMVanolya according to the R code of @Liem Duy Nguyen.