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註釋Glaciers, permafrost, and the hydrologic cycle are expected to change in response to anticipated future atmospheric warming by the end of the 21st century, which could effect water yields to the proposed Susitna-Watana hydroelectric reservoir in Alaska. This study quantifies future changes in glacier wastage, surface and groundwater, permafrost, and evapotranspiration and their combined effect on runoff into the proposed reservoir. This report summarizes findings about potential future changes in runoff associated with anticipated climate change, and describes the glaciers, permafrost, hydrology, and climate, and soils of the upper Susitna River basin. Field measurements and computational modeling were combined to provide estimates of river discharge into the proposed reservoir through the end of the 21st century.