| Title |
Analysis of Water Quality Characteristics According to Short-term Fluctuation of Water Level in the New Dam: Focused on the Upstream Watershed of Yeongju Multipurpose Dam |
| Authors |
이새로미 ( Saeromi Lee ) ; 박재로 ( Jae Roh Park ) ; 황태문 ( Tae Mun Hwang ) ; 안창혁 ( Chang Hyuk Ahnd ) |
| DOI |
https://doi.org/10.15681/KSWE.2020.36.5.431 |
| Keywords |
Lentic system; Short-term period; Water level fluctuation; Water quality parameters; Yeongju Dam |
| Abstract |
The relationship between dam construction and water quality has recently come to be considered an important issue. A dam is a physical factor which causes changes to the river system around it. Considering these points, this study was conducted to obtain basic data by analyzing the relationship between water level fluctuations and water quality parameters in the short-term. In terms of methodology, the new construction of the Yeongju Dam (M5) in 2016 was divided into Stage 1 as the lotic system and Stage 2 as the lentic system, with four years in each period, and the water level fluctuations and water quality were analyzed using official data. As a result of this study, M5, a stagnant area in which organic matter and nutrients accumulate, was found to be an important factor in water quality management. In addition, the water level changed rapidly (0.9±0.2 m → 10.9±7.1 m) as the river environment condition was converted from the lotic system to the lentic system. In addition, water quality parameters such as BOD, COD, TOC, and Chl-a significantly changed in the short-term. Further, since the transport of organic matter and nutrients occurred well in the lotic system, sedimentation was expected to be dominant in the lentic system. Therefore, it was determined that when the river flow is blocked, autochthonous organic matter is an important factor for long-term water quality management in the future. This process can increase the trophic state of the water body. As a result of this study, the TSIKO value was converted from mesotrophic in Stage 1 to eutrophic in Stage 2. Eventually, short-term changes in the river environment will affect not only changes in water level but also changes in water quality. Thus, a comprehensive and strategic approach is needed for long-term water quality management in the future. |