A comprehensive index for stream depletion in coupled human-water systems

摘要: Abstract Intensive land use and cover (LULC) change along with the gradually increasing effects of climate have made streams both hydrologically ecologically vulnerable to depletion. Since stream depletion has a direct impact on human ecological water socioeconomic consequences, it is imperative manage keep them in healthy state. In this study, we developed potential index (SDPI) based concept coupled human-water system (CHWS) operating at simultaneous, interacting scales, tested its applicability watersheds across South Korea. Eight indicators - precipitation, dry days, effective basin area, usage, return flow, groundwater impervious environmental flow supplied by dams were identified as key variables for SDPI. We adopted Structural Equation Model (SEM) estimate weights their causal relationships. Furthermore, applied three different weighting schemes urban, rural, intermediate areas make more applicable watershed LULC. The spatial distribution SDPI results indicated that western Han River, central southern Nak-Dong River some parts southwestern region Korean peninsula are prone from several causes. SDPI, predicting changing streamflow characteristics, can be used policy makers stakeholders determine safe yield without causing long-term decline availability.