For my research work, I want to know which model is best for permaforst hydrology (focusing on surface water flow and ground water recharge) under changing climate and vegetation cover.
You can use SWAT. If your soil systems below permafroset are partially saturated you can use hydros 2D. For this approaches you may change your input in every scenarios. For decrease of vegetation you can decrease water perculation rates. For all scenarios you have to change related inputs.
I am using WEAP Model since last 5 years and also delivered many lecturers and trainings. It is almost impossible to use WEAP-SWAT-Hydrus 2D combination and also not fulfill the required targets as per my knowledge. If you have any idea, welcome to share.