Abstract
Recently, torrential rain and drought have occurred in close temporal proximity and for similar durations due to changes in the spatiotemporal patterns of rainfall owing to climate change. In particular, when a drought occurs, it tends to be prolonged, making it necessary to improve the operation of multipurpose dams that not only control flooding but also serve as water supplies. In this study, standard water volume lines and action plans by response stage were improved so that water could be stored in advance of a drought instead of reservoir operation criteria set based on data from the past. The minimum water demand by use (domestic water, industrial water, and agricultural water) was also calculated. The improved reservoir operation criteria were applied to multipurpose dams in the Nakdong River Basin, and their effects were analyzed by calculating additionally secured water volumes. In the future, in case of lowered water volumes in multipurpose dams owing to a drought, the application of these improved reservoir operation criteria is expected to contribute to water supply stability by delaying entry into the drought stage and minimizing the damages caused by limited water supplies.
Highlights
The functional definition of a drought is a prolonged shortage of rainfall resulting in serious damage to crops and their production
Differences in precipitation between regions have increased due to anthropogenic climate change, and the resulting local droughts have caused extreme water shortages when they lasted for prolonged periods of time
For each of the six multipurpose dams in the Nakdong River Basin, the water volumes from the completion year to 2015 under the existing dam operation criteria were compared with those under the adjusted criteria to analyze their effects
Summary
The functional definition of a drought is a prolonged shortage of rainfall resulting in serious damage to crops and their production. A meteorological drought that occurs because of a long-term rainfall shortage or an extended period of no rainfall develops into an agricultural drought owing to a lack of moisture in the soil, which develops into a hydrological drought in which there are shortages in major water resources, such as dams and rivers. Such water shortages may develop into a socioeconomic drought, causing damages to society at large [1].
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