[논문]황구지천 유역의 오염부하 특성 및 지류 영향 평가

임수진; 임병란; 이한샘; 강주형; 안태웅; 신현상

doi:10.15681/kswe.2021.37.4.249

황구지천 유역의 오염부하 특성 및 지류 영향 평가
Evaluation on Pollution Load Characteristics and Influence of Tributaries in the Hwangguji Stream 원문보기

한국물환경학회지 = Journal of Korean Society on Water Environment, v.37 no.4, 2021년, pp.249 - 262

임수진 (서울과학기술대학교 환경공학과) , 임병란 (서울과학기술대학교 환경공학과) , 이한샘 (서울과학기술대학교 환경공학과) , 강주형 (환경보전협회) , 안태웅 ((주)엔솔파트너스) , 신현상 (서울과학기술대학교 환경공학과)

Abstract ▼ AI-Helper

This study investigated the pollution characteristics of the main pollution zone in the Hwangguji watershed and the influence of the tributary on the main stream. The characteristics of the main pollution zone, including, the water quality index (WQI), stream rating, load duration curve (LDC), delivery load density (DLD), and contribution of the tributary to the mainstream, were evaluated by time-series visual heatmap. The WQI of the mainstream of Hwangguji was lowered to the poor (IV) level from the inflow point of Suwon stream (SW) and the LDC excess rate in the T-P was higher than that of BOD5, especially for the wet season, suggesting that management of non-point source with T-P is preferred. The contribution (%) of the tributaries in the upstream section of Hwangguji watershed were BOD5 14.54%, TOC 15.67%, T-N 5.43%, and T-P 6.97%. In particular, the Suwon sewage treatment plant located in the mainstream showed a high contribution of BOD5 (64.40%) and T-P (53.54%), respectively, due to the high discharge rate (6.019 m3/sec). Meanwhile, Sammi and Gal stream have a large impact on the mainstream with high DLD and poor WQI. Thus, both streams were considered as pollution hot spots. These results provide useful basic data for preparing more effective water quality improvement and management plans in the watershed.

주제어

표/그림 (13)

그림 Fig. 1. River map and sampling sites.
표 Table 1. Monitoring site for the water quality and flow rate of tributaries and mainstream in Hwangguji stream
표 Table 2. Flow rate and water quality of the monitoring sites studied in Hwangguji stream watershed
그림 Fig. 2. Flow rate and water quality of each site in Hwangguji stream watershed, (a) BOD, (b) COD, (c) TOC, (d) T-N, (e) T-P, flow rate of (f1) mainstream and (f2) tributaries.
그림 Fig. 3. WQI for the mainstream and tributaries of Hwangguji stream watershed.
그림 Fig. 4. Heatmap of monthly WQI value distribution of Hwangguji stream watershed.
그림 Fig. 5. Grade classification results according to water quality and flow rate of (a) BOD and (b) T-P.
그림 Fig. 6. LDC analysis results of (1) BOD and (2) T-P in the Hwangguji mainstream at (a) HG-1, (b) HG2, and (c) HG3.
표 Table 3. Excess rate of LDC values calculated for the Hwangguji stream watershed (average values from 2015 to 2020)
표 Table 4. Contribution values and delivery load density in the Hwangguji stream watershed
표 Table 5. The contribution values of BOD and T-P from upstream pollution sources to HG2 site
그림 Fig. 7. Schematic diagram of the lower Hwangguji stream watershed.
표 Table 6. Summary of pollution status for the Hwangguji stream watershed

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