## 9 Conclusions  
A novel method for conducting a preliminary evaluation of the size and propagation of landslide-induced waves in mountain lakes is proposed. A set of equations is used within a numerical modeling framework to characterize the geometric characteristics of a lake and quickly assess the possible wave threat in terms of wave dissipation and expected flow depth along the shoreline (which is different from the expected run-up). Wave propagation controlled by lake geometry provides a general indication of where run-up or inundation would be the highest, although the behavior of the breaking wave is also heavily influenced by topography along the shoreline. The incorporation of landslide properties, behavior, and locations into the workflow will further increase the utility of this approach. The proposed method can be used as a first-order indicator for prioritizing lakes that appear to be particularly susceptible to landslide-induced impulse waves. The findings of this study reveal that _WDPP_ is a valid metric for the \"dissipation power\" (attenuation) of an impulse wave in a mountain lake and that it correlates well to lake geometrical characteristics, particularly area and water volume. The linear relationship between _WDPP_ and _ShpP_, a metric that takes into account diverse lake properties, provides a valuable approach for estimating potential wave dissipation. If the _ShpP_ is unavailable, for example in lakes with complex shapes, water volume can be used to estimate _WDPP_. Furthermore, _WDPP_ can be used to calculate the expected flow depth at the lake shoreline. Results suggest that large periapine lakes (\(V_{w}>10.000\) Mm\({}^{3}\)) are more likely to disperse impulse waves; these attenuate less in smaller alpine lakes (\(V_{w}<10\) Mm\({}^{3}\)). This method can be applied worldwide to mountain lakes that differ in shape, extent, and volume. The minimum required input data are the geometrical characteristics of the lakes. Unlike other proposed methodologies, specific technical knowledge or additional inputs such as digital elevation data are not required, making the proposed method easy to use. However, inclusion of high-resolution digital bathymetric data would produce more accurate assessments. The proposed method is tested with data available for the 2007 Chehalis Lake landslide-generated wave event. Results match well those obtained using the empirical equations published by ETH Zurich (2019 Edition--3D approach, [17; 46]). Despite the positive results, one case study is insufficient to assess the overall reliability of our novel approach, and a validation considering real, observed data is still required. Indeed, additional historic events in which wave characteristics have been directly observed would be particularly valuable for further assessing the method. Furthermore, the applicability of impact volumes that differ from the one used in this study, together with a variety of impact characteristics, must be determined. This study is an initial step in the development of this methodology; additional research is required to improve the method and its application, for example by taking into account properties of the potential impacting mass. Stability analyses of slopes bordering lakes with high hazards from impulse waves, including implications of external triggers such as intense rain events or earthquakes, are recommended to contribute to a proper estimate of the related hazard in a cascade effect context. Recently formed alpine lakes due to glacier retreat should also be included in these investigations.