Most offshore wind farms are expected to be develop mostly within 5 to 10 km from shores, since water depth can be significant further offshore. Power output and loads of wind turbines in such wind farms will be affected by onshore terrains which slow down the wind speed and also increase the turbulence level. In this study, we perform large-eddy simulations to investigate the effect of coastal terrain on the performance of nearshore offshore wind farms. To that end, two LES cases are defined using the characteristic surface roughness of land and sea surfaces. It is found that the case in which onshore terrain is considered, both mean flow field and power output of the wind farm is lower compared to the case in which the effect of onshore terrain is neglected. The power output for the case in which onshore terrain is considered is almost 47% lower than the case in which onshore terrain is not considered.
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