| Title |
Probabilistic Monitoring of Effect of Meteorological Drought on Stream BOD Water Quality |
| Authors |
서지유 ( Jiyu Seo ) ; 이정훈 ( Jeonghoon Lee ) ; 이호선 ( Hosun Lee ) ; 김상단 ( Sangdan Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2023.39.1.9 |
| Keywords |
BOD; Copula; Environmental Drought Index; Meteorological Drought |
| Abstract |
Drought is a natural disaster that can have serious social impacts. Drought's impact ranges from water supply for humans to ecosystems, but the impact of drought on river water quality requires careful investigation. In general, drought occurs meteorologically and is classified as agricultural drought, hydrological drought, and environmental drought. In this study, the BOD environmental drought is defined using the bivariate copula joint probability distribution model between the meteorological drought index and the river BOD, and based on this, the environmental drought condition index (EDCI-BOD) was proposed. The results of examining the proposed index using past precipitation and BOD observation data showed that EDCI-BOD expressed environmental drought well in terms of river BOD water quality. In addition, by classifying the calculated EDCI-BOD into four levels, namely, ‘attention’, ‘caution’, ‘alert’, and ‘seriousness’, a practical monitoring stage for environmental drought of BOD was constructed. We further estimated the sensitivity of the stream BOD to meteorological drought, and through this, we could identify the stream section in which the stream BOD responded relatively more sensitively to the occurrence of meteorological drought. The results of this study are expected to provide information necessary for river BOD management in the event of meteorological droughts. |