This study conducted a long-term flow monitoring to investigate effects wind-driven currents influenced by topographic effects in Lake Kasumigaura where tidal currents and geostrophic current do not influence. In addition, a high resolution numerical model was developed to reproduce wind-driven currents in the study area. Observed results show that wind-driven currents tend to be enhanced near the coast leading to intensified kinetic energy. Meanwhile, in the middle of the lake basin, counter currents are generated by enhanced wind-induced currents along the coast, which results in suppressed kinetic energy in the middle of the lake basin. Numerical simulations provide enhanced wind-induced currents along the coast same as the observed results. However, model results in the middle of the lake basin are different from the observations. This inconsistency is supposed to be caused by small-scale sub-grid scale turbulent motions that are not considered in the numerical model.