Author(s): Dongmin Kim; Sewoong Chung

Linked Author(s): Se-Woong Chung

Keywords: Management; Mass balance; Nutrification; Numerical model; Organic carbon; Water quality

Abstract: This study focuses on Daecheong Reservoir, located in a monsoon climate region, facing persistent algae overgrowth and significant organic matter inflow during rainfall events from adjacent forests, farm fields, and rice paddies. This underscores the need for a nuanced approach to organic matter management, particularly addressing recalcitrant organic matter (ROC) and Total Organic Carbon (TOC) emerges as a crucial indicator in this context[1]. The objective of this research was to propose an efficient TOC management strategy by examining the organic matter load characteristics and organic carbon mass balance of Daecheong Reservoir, utilizing a 3D hydrodynamic and water quality model[4]. The analysis revealed higher contribution rates from internal sources during pre- and post-monsoon periods, contrasting with elevated external contributions during the concentrated rainfall of the monsoon period. Over the entire 2018 period, internal load accounted for 56%, surpassing external load at 44%. The study emphasized the predominant impact of internally generated organic carbon within the reservoir. Therefore, a targeted management plan addressing the primary production constituting 38% of the internal origin, is deemed effective for TOC management[2,3]. In addition, during the monsoon period, Sedimentation removal is efficient because a large amount of particulate organic matter flows in with rainfall.

DOI: https://doi.org/10.3850/iahr-hic2483430201-153

Year: 2024