| Title |
Analysis of Spatial Water Quality Variation in Daechung Reservoir |
| Authors |
이흥수 ( Heung Soo Lee ) ; 정세웅 ( Se Woong Chung ) ; 최정규 ( Jung Kyu Choi ) ; 오동근 ( Dong Geun Oh ) ; 허태영 ( Tae Young Heo ) |
| Keywords |
Daechung reservoir; Model dimension; Reservoir water quality; Spatial variations |
| Abstract |
The uses of multi-dimensional hydrodynamic and water quality models are increasing to support a sustainable management of large dam reservoirs in Korea. Any modeling study requires selection of a proper spatial dimension of the model based on the characteristics of spatial variability of concerned simulation variables. For example, a laterally averaged two-dimensional (2D) model, which has been widely used in many large dam reservoirs in Korea, assumes that the lateral variations of hydrodynamic and water quality variables are negligible. However, there has been limited studies to give a justification of the assumption. The objectives of this study were to present the characteristics of spatial variations of water quality variables through intensive field monitoring in Daechung Reservoir, and provide information on a proper spatial dimension for different water quality parameters. The monitoring results showed that the lateral variations of water temperature are marginal, but those of DO, pH, and conductivity could be significant depending on the hydrological conditions and local algal biomass. In particular, the phytoplankton (Chl-a) and nutrient concentrations showed a significant lateral variation at R2 (Daejeongri) during low flow periods in 2008 possibly because of slow lateral mixing of tributary inflow from So-oak Stream and wind driven patchiness. |