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Journal of the Korean Society of Hazard Mitigation 2014;14(4):379-379.
Published online August 31, 2014.
장치형 비점오염저감시설의 유입수로 분기각과 단면비율에 따른 수두손실계수 분석
송영석, 이희섭, 박민규, 박무종
Analysis of Head Loss Coefficient for Non-point Pollutants Removal Equipments with Branch Angle and Cross-section Ratio of Inflow Channel
Youngseok Song, HeeSub Lee, Minkyu Park, Moojong Park
Abstract
Various NPS (Non-Point Sources) pollutants flow into a stream after rainfall event that directly causes water quality deterioration. NPRE (Non-point Pollutants Removal Equipments) is necessarily emphasis for water quality improvement. Existing installed NPRE only consider conditions of location or digestion capacity that causes low removal efficiency. In this study, head loss coefficient are analyzed by branch angle and ratio of channel flow area of inflow channel when polluted stream water flows in NPRE. Branch angle of inflow channel ($30^{circ}$, $45^{circ}$, $60^{circ}$, $75^{circ}$, $90^{circ}$) and entrance channel on ratio of channel flow area of inflow channel (20%, 30%, 40%) are analyzed Using Two-dimensional hydraulic modeling. Result from decreasing branch angle of inlet and increasing entrance channel on ratio of channel flow area of inlet that showed decreasing head loss coefficient.
Key Words: Non-point pollutants removal equipments; Head loss coefficient; Different shape of inflow channel; Branch angle of inflow channel; Two-dimensional numerical modeling
요지
강우발생시 각종 비점오염물질은 우수유출수와 함께 하천으로 유입되는 수질저하의 직접적인 원인으로 비점오염원 저감시설의 필요성이 대두되고 있다. 기존에 설치된 장치형 비점오염저감시설의 경우 단순히 입지조건이나 처리용량만을 고려한 설계로서 처리효율이 낮은 실정이다. 본 연구에서는 오염된 하천수가 장치형 비점오염저감시설로 유입시 유입수로 분기각과 단면비율에 따른 수두손실계수를 분석하고자 한다. 분석모형으로는 2차원 수치모델을 활용하였으며 유입부의 분기각($30^{circ}$, $45^{circ}$, $60^{circ}$, $75^{circ}$, $90^{circ}$)과 본류수로에 대한 유입수로 단면비율(20%, 30%, 40%)에 대하여 분석을 진행하였다. 분석결과 유입수로의 분기각이 감소할수록, 본류수로에 대한 유입수로 단면비율이 증가할수록 수두손실계수는 감소하는 것으로 나타났다.
핵심용어: 장치형 비점오염저감시설; 수두손실계수; 유입수로 형상; 유입수로 분기각; 2차원 수치모델
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