A Study on Water Quality Modeling for TMDL in Nadong River, Korea

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Kim Young Do, Jung Woo Suk, Lee Sung Jun, Lee Yong Gon

Thursday 2 july 2015

12:48 - 12:51h at Asia (level 0)

Themes: (T) Hydro-environment, (ST) Impacts of pollutants on the water environment, Poster pitches

Parallel session: Poster pitches: 11G. Environment - Impact

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Total Maximum Daily Loads (TMDL) management system is a policy in new era to achieve both the development and conservation of watershed through a scientific method different from conventional one which focuses only on regulations for the conservation of water quality. Recently, sixteen weir were built in four major rivers as part of the river environment change business and of those sixteen, eight of the hydraulic structures (multi-functional weirs) were installed and dredged in Nakdong river which caused the change of the river cross-section. It eventually led to the change of river environment and hydraulic properties such as hydraulic retention time, river cross-section, longitudinal section of stream, water level, energy grade, flow velocity. The characteristics of river are mostly affected by hydraulic and hydrologic characteristics. Therefore, one should consider the importance of hydraulic properties which influence water quality prediction during water quality modeling. In this research, we have applied new hydraulic properties by the change of river environment and conducted water quality modeling in order to predict target water quality and water quality prediction using pollution load reflecting the pollution source, i.e., population, sewage treatment plant in unit watershed along with TDML in Nakdong river.