Abstract
The study focused on changes of river's water quality dependent on rainfall events. Hwang River, at South Korea was chosen for the study. Water samples at up and downstream of Hwang River were collected for three different rainfall events on Sep. 10th 2011, Jul. 14th 2012, and Aug. 13th 2012. Samples were analyzed for COD, TSS, T-N and T-P. As results, the changes of water quality due to rainfall events were dependent on the amount of precipitations as well as patterns of rainfall event. Also, changes of water quality at upstream were affected by the amount of discharges from Hapcheon Dam located in upper side of the river. For proper management of Hwang River's water quality, plans for early rainfall events after long-term dry season should be established.
Highlights
The river runs through mountain area, agricultural area as well as urbanized area, so that results of this study would give some ideas to the researchers who are interested in rainfall effects on river’s water quality with various types of watershed
The sampling point at upstream is closed to Hapcheon Dam floodgate and the one at downstream is right before the confluence of Hwang River and Nakdong River
The amount of dam discharge would depend on total precipitation and it greatly affects on upstream flow rate of Hwang River
Summary
Effects of early rainfall events on river’s water quality were investigated focused on Hwang River,. The sampling point at upstream is closed to Hapcheon Dam floodgate and the one at downstream is right before the confluence of Hwang River and Nakdong River. The amount of dam discharge would depend on total precipitation and it greatly affects on upstream flow rate of Hwang River. Streamflow at upstream were dependent on dam discharges and those at downstream had lagged time to respond to rainfall events. (a) Hapcheon Dam (b) Sampling point at upstream and downstream Figure 2. Hapcheon Dam discharge rates were used as streamflow data for upstream sampling station and data from automatic monitoring system of Nakdong Flood Control Center were used as flow rate for downstream sampling point. Sample 1 took before rainfall events, Sample 2 early rainfall events, Sample 3 peak of rainfall events, Sample 4 end of rainfall events, and Sample 5 after rainfall events
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