건강한 하천 유지를 위한 건천화 지표 선정 및 건천화 잠재지수(SDPI) 산정

초록

Recently, stream depletion has been accelerated due to drought occurred by abnormal climate, increase of water demand and decrease of long-term run off by urbanization. In this study, a methodology for indexing was applied to 115 medium influence areas and characteristics of drying stream was analyzed using GIS. Stream depletion indicators are composed of rainfall (rainfall, maximum consecutive dry days), basin area, river water intake, recycled water, long-term run off (underground water intake, land use), dam supplying channel flow for maintenance. Indicators for underground water intake and land use distinctly have regional difference while indicators for river water intake and dam supplying channel flow for maintenance lose distinction because they have low regional variations in area without localized area. Six indicators composed of eight factors used normalized value by using z-score method. Stream depletion potential index involving six indicators is calculated and map was made for grasping possibility of stream depletion deepen. Then, qualitative analysis was performed for stream depletion in this study. The index would be practical for maintenance and management of river by leading to provide not countermeasure but preventive policy.

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