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SS 농도를 고려한 내성천 하류의 유사특성과 하상변동 예측
조창대,윤종수,이재운,천세억,Jo. Chang Dae,Yoon. Jong Su,Lee. Jae Woon,Cheon. Se Uk 한국방재학회 2013 한국방재학회논문집 Vol.13 No.4
본 연구에서는 우리나라의 대표적인 충적하천인 내성천 하류를 대상으로 장기하상변동에 적합한 HEC-6 모형을 개선한 HEC-RAS 모형을 이용하여 유사이송 공식에 따른 장기하상변동을 예측 및 평가하였다. HEC-RAS 모형으로 모의한 결과를 평가하기 위하여 평균제곱근오차(Root mean square error, RMSE)와 상대평균절대오차(Relative mean absolute error, RMAE)의 통계적 변량을 사용하였으며, 또한 91개의 River Station 지점의 시계열 계산결과를 검토하였다. 내성천 유역의 부유사 흐름에 대한 확인을 위하여 SS 농도를 검토한 결과 유량이 적은 갈수기에도 일정량 이상의 농도를 유지함으로써 지속적인 유사이송이 진행되고 있음이 확인되었다. This study was conducted with the national river, Naeseong stream which is typical alluvial river. In this paper, various sediment transport equations were used to predict and estimate long-term riverbed variation for downstream in Naeseong stream. Statistical variables such as RMSE(Root Mean Square error) and RMAE(Relative Mean Absolute Error) were used to evaluate reliability of HEC-RAS model. Also calculations of time-series of 91 river stations were reviewed. To confirm flow of suspended load of the Naeseong stream, We examined SS concentrations. As a results, SS flow was retained by maintaining over the certain concentration in dry season.
낙동강수계 수질의 시·공간적 특성에 대한 통계학적 분석
서미진 ( Mijin Seo ),조창대 ( Changdae Cho ),임태효 ( Taehyo Im ),김상훈 ( Sanghun Kim ),윤현정 ( Hyunjeong Yoon ),김용석 ( Yongseok Kim ),김경훈 ( Gyeonghoon Kim ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.3
Water quality is characterized by various complex factors. Therefore, a systematic understanding of water quality trends is required to carry out a proper evaluation. In this study, we analyzed the spatio-temporal water quality characteristics of the Nakdong River using five-year data from 2012 to 2016. Data was collected on the pH, DO, BOD, COD, SS, TN, TP, TOC, WT, EC, NH<sub>3</sub>-N, NO<sub>3</sub>-N, PO<sub>4</sub>-P, Chl-a, rainfall, and total and fecal coliforms. A total of 38 water quality measurement stations, from Andong1 to Gupo, were considered. Statistical analyses including trend, cluster, and factor analyses were conducted to identify the dominant water quality components affecting the Nakdong River. The Nakdong River was spatially classified into three groups for up-stream (Andong1 to Sangju1), mid/up-stream (Donam to Dalseong), and mid/down-stream (Hwawonnaru to Gupo) data collection, and temporally into two groups for summer/fall (7~10), and the rest of the season (11~6) data. The water quality of the entire Nakdong River showed trends similar to the mid/down-stream section, which indicates the importance of water quality management in this section. Suspended solids, phosphorus, and coliform groups were established as important factors to be considered in the summer/fall season across the river, especially in the mid/down-stream section. Nitrogen and organic matter were identified as important factors to be considered in the rest of the season, especially in the mid/up-stream section. This study could help determine the water quality components that should be intensively monitored in the Nakdong River.