The ALEX17 diurnal cycles in complex terrain benchmark

Abstract The NEWA ALEX17 experiment was conducted with the objective of characterizing wind conditions upstream Alaiz Test Site for validation flow models. From intensive operational period, a case study has been selected Wakebench benchmark consisting four consecutive days relatively persistent winds from North. is centered around 118-m mast at site and six additional masts located along valley lee side ridge delimiting 8-km long area interest. follow-up GABLS3 diurnal cycle in flat terrain to test mesoscale-to-microscale transient steady-state modeling methodologies assessment stability-dependent bin-averaged conditions. Meso-micro reduce speed mean bias 32%, 3-km mesoscale, ±5%. Beyond mitigation, these initial results demonstrate added value meso-micro coupling reproducing non conventional like high-shear low-level jets stable negative shear unstable also discusses challenges each methodology going forward.