I found one very interesting issue regards with multiple roughness length rose in one WAsP project and I described my process as following: 1. I made a offshore wind farm project map with predefined roughness length of 50kmx50km and load to my WAsP Project. The roughness length rose looked like 0 for left side and 0.03~1.2 for right side. 2. I selected a semi-offshore met mast as wind atlas source. 3. I inserted two wind turbine in offshore area which is 8km away from semi-offshore met mast and each wind turbine has 900m space. 4. I perform AEP calculation and revived one value. However, if I assigned individual roughness length rose to each wind turbine I will get 1% higher AEP than original value. Is it possible for WAsP to apply multiple roughness length rose in one project? How WAsP to deal roughness length rose conflict?
