Supplementary material to "Review article: Flash Floods in Mountainous Regions: Global Research Trends, Process Mechanisms, and Control Measures"

This review employs a systematic, transparent approach to identify, screen, and synthesise academic literature on flash 15 floods in mountainous environments.The objective is to capture a representative body of peer-reviewed evidence while minimising selection bias through a predefined search strategy, explicit inclusion/exclusion criteria, and a staged screening procedure.The overall process was designed to be reproducible and scientifically robust, and it follows established systematic review reporting principles (PRISMA 2020; Page et al., 2021).An exhaustive keyword search was conducted in the Web of Science Core Collection and Scopus databases for the period 20 2000-2025.The search strategy combines (i) disaster-related vocabulary (e.g., flash flood, cloudburst, rapid-onset flood) and (ii) terrain-related descriptors (e.g., mountain, alpine, upland, wadi, arroyo) to cover heterogeneous terminology across disciplines and regions.By jointly constraining hazard type and terrain setting, the search focuses on mountainous flash floods while reducing the inclusion of non-target contexts such as coastal flooding or urban waterlogging.The Boolean query used was: 25 ("flash flood*" OR "flash-flood*" OR "pluvial flash flood*" OR "rapid-onset flood*" OR "short-duration flood*" OR "cloudburst*" OR "cloud burst" OR "pluvial flood*" OR "gully flood*" OR "torrent flood*" OR "mountain torrent*" OR (flood* NEAR/3 (flash OR rapid OR short-duration OR pluvial OR torrent OR gully))) AND 30 (mountain* OR alpine OR "hilly area*" OR hill* OR upland* OR highland* OR plateau* OR "high-elevation" OR "steep slope*" OR foothill* OR headwater* OR "small catchment*" OR orographic OR wadi* OR arroyo* OR ravine* OR torrent* OR gulch*)