| Title |
Hydrochemical Effects of Tributaries and Discharged Waters in the Yangjae Stream Flowing Peri-urban Area |
| Authors |
김연태 ( Youn-tae Kim ) ; 정의진 ( Euijin Chung ) ; 박종훈 ( Jonghoon Park ) ; 우남칠 ( Nam C. Woo ) |
| DOI |
https://doi.org/10.15681/KSWE.2018.34.6.678 |
| Keywords |
Discharge; Seoul; Urban stream; Water chemistry |
| Abstract |
The purpose of this study was to understand the unique and complicated feature of urban stream receiving various inflows. The Yangjae stream, the second tier of the Han River, runs through the southern parts of Seoul, Korea and its middle part flows on the boundary of Seoul where land use is actively changing. Stream flow was greatly influenced by rainfall. Other than rainfall events, effluent discharge from wastewater treatment plant (WWTP) comprised 51 % of stream flux. As a result, majority ions water chemistry was changed at the receiving zone of the discharged effluent (Zone A). Its contribution increased to 69.9 % at the second sampling period with low stream flow. In the middle zone, inflows from the northern area, recently developed to a residential district showed low NO3-N and high HCO3, Ca, SO4, and SiO2 indicating the effects of groundwater and concrete. One inflow (T-8), with extremely high Na and Cl, median SiO2, was assessed to have anthropogenic influence, however its contribution to main stream was under 1 %. Road construction near Y-13 also affected water chemistry leading to the highest Na and Cl concentration. These hydro chemical changes can be critically used to evaluate the changes in water budget and fate of chemicals in a peri-urban watershed occasioned by human activities on the Yangjae. |