Landslides, rockfalls, and iceberg calving impacting into a water body generate large landslide-tsunamis posing serious hazard in lakes reservoirs. These waves can impact even overtop dams as the 1963 Vajont disaster Italy. However, estimating effects of tsunamis on dams, e.g. pressures forces, 3D is challenging. An accurate prediction these also important for range coastal offshore application...