江邊濾過水 開發對象地域 評價 및 開發可能量 算定에 관한 硏究 = (A) study on a site evaluation and yield assessment for river bank filtration

다국어 초록 (Multilingual Abstract)

The candidate areas reviewed for river bank filtration are scattered over tens of kilometer. To increase efficiency and cost-effectiveness, screening those candidates and selecting the optimum districts must be preceded before implementation. Based on the previous research data and information, a set of standards to conduct electrical specific resistance, boring tests, and pumping test was prepared. These surveys and tests were performed according to the standards. Based on the survey and test results, hydraulic conductivity, aquifer thickness, and the length for bank filtration were calculated. By assuming the use of horizontal collection wells, potential intake volumes were calculated through the primary MODFLOW modeling.
As hydraulic conductivity, thickness of the major aquifer, and length are the most important factors in calculating intake volume, these three elements were given specific weight values to score the candidate districts. Using the scores, the candidate districts were ranked. The ranking was compared with the ranking acquired through the primary MODFLOW modeling to adjust the scoring methodology. From the ranked candidate list, pumping tests were conducted at the top 3 districts again to calculate accurate hydraulic conductivity. Those districts were scored again and the scores were compared with the secondary MODFLOW modeling results.
Using the groudwater modeling program, FEFLOW, a model to estimate intake volume was prepared. Studies on the entire modeling processes from survey, and modeling to calibration, were conducted. The results, including the Definition of a modeling area, mesh and aquifer composition, FEFLOW modeling composition, application of hydraulic constants were analysed. The model was adjusted using the behaviour of static groundwater data before bank filtration; and calibrated using unsteady groundwater flow level to the function of timely changes of water level of the Nak-dong River. Groundwater flow was modeled by assuming 10 radial horizontal collection wells to evaluate intake volume.
Additionally, in terms of water quality, oxidation processes of iron and manganese when bank filtered water with low DO and high iron and manganese is combined with water from the Nam-gang Dam with high content of DO were studied using EPANET-MSX (multi-species extension). Equations for reactions were developed and for the first time in Korea, by building a numeric model, concentrations of iron and manganese were predicted.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 1.1 연구배경 1
• 1.2 연구목적 4
• 1.3 연구범위 및 내용 5
• 제 2 장 국내외 연구동향 7
• 2.1 국내 연구동향 7
• 2.2 국외 연구동향 14
• 제 3 장 이론적 배경 19
• 3.1 개발량 추정을 위한 모델선정 및 기본이론 19
• 3.1.1 개발량 산정방법 19
• 3.1.2 개발량 추정에 쓰이는 모델 22
• 3.1.3 장단점 비교에 의한 모델선정 24
• 3.1.4 FEFLOW 26
• 3.1.5 FEFLOW의 입력인자 30
• (1) 수리전도도 30
• (2) 저류계수 32
• (3) 비저류계수 34
• (4) 비산출률 40
• 3.2 혼합수 수질예측을 위한 모델 선정 및 기본이론 40
• 3.2.1 혼합수 수질예측의 필요성 40
• 3.2.2 수질예측 모델의 선정 41
• 3.2.3 EPANET-MSX(Multi-Species Extension) 46
• 제 4 장 개발대상지역 평가방법 51
• 4.1 연구대상지역 51
• 4.1.1 연구대상지구 개관 51
• 4.1.2 연구방법 및 절차 53
• 4.2 현지조사 55
• 4.2.1 현지조사 기준수립 55
• 4.2.2 전기비저항탐사 및 시추조사 56
• 4.3 지구별 우선순위 점수평가법 개발 62
• 4.3.1 평가지표 선정 62
• 4.3.2 1차 모델링을 통한 점수평가법 개발 65
• 4.3.3 2차 모델링을 통한 점수평가법 검증 74
• 제 5 장 적용 및 결과분석 81
• 5.1 FEFLOW를 통한 개발가능량 산정 81
• 5.1.1 FEFLOW 모델 수립 81
• (1) 모의영역 설정 83
• (2) 격자망 및 대수층 구성 84
• (3) FEFLOW 모델구성 90
• (4) 수리특성 값 설정 94
• 5.1.2 모델의 보정 103
• (1) 정류모의 조건에 따른 보정 103
• (2) 부정류모의 조건에 따른 보정 108
• 5.1.3 방사형 수평 집수정 설치에 따른 개발량 산정 113
• (1) 자갈층에서 개발하는 경우 119
• (2) 모래층 및 자갈층에서 개발하는 경우 123
• (3) 개발가능량 확정 127
• 5.2 혼합수 수질예측 127
• 5.2.1 혼합수 수질예측 입력자료 127
• 5.2.2 혼합수 수질예측 결과 및 분석 134
• 제 6 장 결론 138
• 참고문헌 140
• ABSTRACT 147