抄録
Water shortage has been a serious problem for a long time in many countries and areas in the world. In Japan, a research programme is now in progress to sophisticate the cloud seeding techniques to enhance the snowfall in the catchment of dams located downwind the Echigo Mountains. We conducted the long-term numerical experiments through two winters, using a high resolution meso-scale model, in order to evaluate how frequently the suitable situations for cloud seeding appeared in this region. As a result, the opportunities appeared in one-third of the total cases concerned here. In addition, it was attempted to estimate the seeding effect on the surface snowfall in the focused dam catchment. It was found that the surface snowfall enhancement was expected to be more than 200 mm, if the cloud seeding was conducted in all preferable cases through the winter when we had a record little snowfall.
