Dear all,
if a SWAT model is calibarted based on a static land use over the simulation period, can it be used for simulating the watershed with yearly dynamic land use such as yearly rotation? how the crop yields would be reliable?
Best,
Shima
This not recommended the quantification of nutrient dynamics that are related to dynamic changes of land use. Consequently, you will not be able to validate this results. The spatial crop distribution is updated dynamically for each year.
However, you may estimate hydrological system (it would be nice to compare non-agricultural land use areas and potatoes crop, for example).
This presented approach allows to evaluate the land use change to selected best management practices in some countries.
Dear Wiktor Halecki,
Thanks for the response. So such a model can be used for hydrological assessment of the watershed. However, I would like to know how we can compute crop yields of yearly dynamic land use via swat?
Best,
Shima
Dear Shima,
When you apply a hydrological model to simulate the effects of land use changes on the hydrology of a catchment or area, ideally you calibrate the model under dynamic land use conditions and validate the model under dynamic land use conditions as well. In particular in the validation, you would like to show that the model is able to simulate the effects of land use changes on hydrology for the right reasons.
I don't think SWAT is very suitable to simulate (dynamic) crop yields. SWAT primarily is a hydrological model which can be used to simulate a diversity of water quantity and water quality cases and problems. Crop growth simulation models such as Aquacrop, EPIC and Apsim might be more suited for that purpose.
Regards,
Martijn
Dear Martijn,
Thank you very much for the response and explanantion. I also assume that SWAT is more powerful in hydrologocal simulation.
Best,
Shima
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