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http://dx.doi.org/10.3741/JKWRA.2021.54.9.693

Spatial assessment of heat wave and river water quality  

Lee, Jiwan (Division of Civil and Environmental Engineering, College of Engineering, Konkuk University)
Kim, Sehoon (Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University)
Han, Daeyoung (Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University)
Shin, Hyungjin (Rural Research Institute)
Lim, Hyeokjin (Korea Institute of Hydrological Survey)
Kim, Seongjoon (Division of Civil and Environmental Engineering, College of Engineering, Konkuk University)
Publication Information
Journal of Korea Water Resources Association / v.54, no.9, 2021 , pp. 693-704 More about this Journal
Abstract
The purpose of this study is to evaluate the relationship between heat wave and river water quality. The daily maximum air temperature (Tmax) of 91 meteorological stations of the Korea Meteorological Administration and 13 river water quality factors (DO, BOD, COD, TOC, TN, DTN, NH4-N, NO2-N, NO3-N, TP, DTP, PO4-P, Chl-a) of Ministry of Environment were analyzed. The correlation analysis was performed on Tmax and water quality factors, and the determination coefficients (R2) of DO, Chl-a, and TN with Tmax showed high values of 0.782, 0.609, and 0.691 respectively. To analyze the spatial impact between heat waves and water quality factors, the heat wave intensity (HWI) and heat wave duration (HWD) were calculated using the Tmax. The hotspot and spatial statistical analyses were applied for spatial impact evaluation. As a result of hotspot analysis, the heat wave index (HWD, HWI) showed high spatial pattern in the downstream of Nakdong River basin, and Chl-a and TN showed the same pattern. In case of spatial statistical analysis for water quality due to heat wave, the most obvious spatial variability was DO.
Keywords
Heat wave; Water quality; Correlation analysis; Hotspot analysis; Spatial statistical analysis;
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