| Title |
Analysis of Pollution Characteristics in the Mainstream and Its Tributaries of Gongneung Stream Using Water Quality Index and Pollution Load Data |
| Authors |
유재현 ( Jae-hyun Yu ) ; 이한샘 ( Han-saem Lee ) ; 임병란 ( Byung-ran Lim ) ; 강주형 ( Joo-hyoung Kang ) ; 안태웅 ( Tae-ung Ahn ) ; 신현상 ( Hyun-sang Shin ) |
| DOI |
https://doi.org/10.15681/KSWE.2020.36.2.125 |
| Keywords |
Delivery ratio; Gongneung stream; Load duration curve; Pollution sources; Tributaries; Water quality index |
| Abstract |
In this study, we identified the major pollution-zones of the mainstream and its tributaries of Gongneung stream and investigated their pollution sources based on water quality, flowrate and pollution-load data of the stream having the characteristics of the urban-rural complex to examine the effect of the tributaries on the water quality changes in the mainstream. The water quality and flowrate data were collected for 10 months (2018 ~ 2019) at 3 points of mainstream and ten tributaries. Water quality index (WQI), load duration curve (LDC), discharge load density (DLD)and delivery ratios for each tributary were obtained so as to investigate the pollution characteristics and some of the information visualized on GIS. The main pollution-zone in the Gongneung stream was in the middle and lower streams, and the tributaries that may affect the pollution of the area were JS, JY, SL and SM. JS and SL had low WQI levels (34.7/37.5) and DLD (kg/d/km2) of BOD and T-P were relatively high in JY (99.2/6.00) and SL (60.0/2.07). BOD and T-P delivery ratios in JS were high (0.94/0.83), suggesting that JS had significant influence on the water quality of the main pollution-zone in the Gongneung stream. Meanwhile, SM having a high T-P delivery ratio (0.97) was found to be more affected by the non-point source due to the higher LDC excess rate (%) in the low flow compared to high flow. This study provides basic data on the water quality and pollution characteristics of the Gongneung stream, and the analysis results are expected to be used as examples for identifying the main pollution-zone and tributaries of stream and their pollution sources. |