Bio‐geomorphic alteration through shifting flow regime in a modified monsoonal river system in Korea

River processes and patterns are affected by changes in the watershed driven natural human-induced causes. A sudden pattern alteration from a “white river” (bare soils) to “green (vegetated) influences riverine biodiversity can increase flood risk. Despite these significant impacts, knowledge on triggers that kickstart feedback exacerbating bio-geomorphic is insufficient. In this study, we collected analyzed detailed monitoring data sandy, hydro-morphologically active, monsoon-driven river Korea. The surface area covered vegetation has been increasing; intensified after 2014–2015 drought, which provided window of opportunity for establishment. During pioneer densely colonized bare sandbars temporarily exposed riverbed. partial rejuvenation several subsequent floods, succession woody occurred, resulting stable cover. Narrowing incision low-water channel secondary channels formed inside floodplain. results study show rapid triggered shifts flow regime primed changes. Furthermore, modified rivers might be brink similar bio-physical alterations through shifting following climate change, leading increased risk impacts endemic biodiversity.