저영향개발 시설 설계 기준에 따른 용량 평가 방법 연구
Research on Design Capacity Evaluation of Low Impact Development according to Design Criteria
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전 세계적으로 도시화로 인해 파괴된 자연물 순환시스템 회복을 위해 저영향개발 (Low Impact Development, LID) 시설에대한 관심이 커지고 있다. 하지만, LID 시설 용량 적정성 평가를 위한 종합적인 분석이 이루어지지 않아 LID 시설 도입에많은 어려움이 제기되고 있다. 본 연구에서는 LID 시설 4개소(식생수로, 식생여과대, 식생체류지 및 투수블록)의 강우 모니터링결과를 바탕으로 저감 효율 및 적정 용량 산정 방안을 분석하였다. WQV과 WQF을 설계 기준으로 하는 LID 시설의 강우유출수(37%) 및 오염물질(TSS, BOD, TN 및 TP) 별 저감 효율(20% ~ 37.1%)이 차이를 보이는 것으로 나타났다. 이를 바탕으로용량 적정성 평가를 위한 SA/CA 그래프 도출 결과 모든 항목에서 결정계수 0.5 이상(비선형회귀모형 기준)으로 나타났으며, 특히 강우 유출수 및 TP에서 높은 결정계수를 보였다. 그리고 본 연구에서 제안하는 LID 시설의 구조적 차이를 고려한 ‘SA/CA & L/CA’ 그래프 도식 결과, ‘SA/CA’보다 강우 유출수, TSS 및 TP 결정계수가 향상됨을 확인하였다. 본 연구를 통해 LID 시설의 용량 적정성 평가를 위한 ‘SA/CA & L/CA’ 적용 가능성을 확인하였으며, 향후 일반화 및 표준화를 위한 추가적인연구를 수행할 필요가 있다
Abstract
The interest in LID facilities is increasing worldwide for recovery of natural water cycle system to destroy by urbanization. However, problems are raised when installation of LID because comprehensive analysis about design capacity adequacy of LID facilities was not conducted completely. In this research, removal efficiency and design volume adequacy of LID facilities were analyzed based on rainfall monitoring data in four LID facilities(Vegetated Swale, Vegetative Filter Strip, Bio-Retention and Permeable Pavement). As a result, group of LID facility designed on WQV was shown higher flow(37%) and pollutants(TSS, BOD, TN and TP) removal efficiencies(20 ~ 37%) than group of LID facility designed on WQF. SA/CA graph was drawn for evaluation of design volume adequacy based on rainfall monitoring data. In this SA/CA graph, coefficient of determination show over 0.5 in all parameter, especially, Flow and TP were show over 0.95. And, ‘SA/CA & L/CA’ graph considering difference of structure mechanism in LID facility suggested in this research was confirmed that improved coefficient of determination in flow, TSS and TP than SA/CA graph. According to this research results, feasibility of applying ‘SA/CA & L/CA’ graph for evaluation of design volume adequacy in LID facility, and it is necessary to follow up research for generalization and normalization.
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