초록 ▼

본 연구에서는 복잡한 지형과 자연 하천구조의 동역학적인 흐름환경을 효과적으로 해석할 수 있는 하천흐름해석모형(RAM2), 하천에 유입된 오염물질의 이송-확산 과정을 해석하는 오염확산해석 모형(RAM4), 토사 이송 및 하천의 하상변동을 해석할 수 있는 하상변동해석모형(RAM6) 및 세 개의 모형에 전, 후처리 기능을 제공하는 GUI시스템의 연계를 통하여, 하천에서의 흐름특성을 해석하고 예측할 수 있는 효율적이고 유기적인 유한요소모형 RAMS를 개발하였음.

본 3단계 연구에서는 각 해석엔진의 개선, 소프트웨어의 검증 및

본 연구에서는 복잡한 지형과 자연 하천구조의 동역학적인 흐름환경을 효과적으로 해석할 수 있는 하천흐름해석모형(RAM2), 하천에 유입된 오염물질의 이송-확산 과정을 해석하는 오염확산해석 모형(RAM4), 토사 이송 및 하천의 하상변동을 해석할 수 있는 하상변동해석모형(RAM6) 및 세 개의 모형에 전, 후처리 기능을 제공하는 GUI시스템의 연계를 통하여, 하천에서의 흐름특성을 해석하고 예측할 수 있는 효율적이고 유기적인 유한요소모형 RAMS를 개발하였음.

본 3단계 연구에서는 각 해석엔진의 개선, 소프트웨어의 검증 및 RAMS 상용화 출시를 목적으로 지속적이고 정기적인 베타버전 출시 미 회의 과정을 거쳤으며, 이를 통하여 모형 간 연동 범위 및 GUI 기능 구현 범위 등을 혐의하고 실질적인 업무를 추진하였음.

RAMS는 국내 상용버전이 완성되어 서울대, 연세대, 경북대, 인제대, 창원대 등에서 하천 현장에 적용하여 검증이 완료 되었으며, 현재 상용버전 출시회를 남겨두고 있음.
(출처 : 보고서 요약서 5P)

Abstract ▼

4. Application of the result
1) River flow analysis system(RAM2)
a. In this study, efficient processing of irregular geometry are taken into account. Also analysis of wet/dry situation depending on rise/drop of water level is performed. With the results, applications were verified for various

4. Application of the result
1) River flow analysis system(RAM2)
a. In this study, efficient processing of irregular geometry are taken into account. Also analysis of wet/dry situation depending on rise/drop of water level is performed. With the results, applications were verified for various type of wet/dry algorithm

b. The Dry/Wet algorithm developed in this study is Deforming Grid Method which requires the definition of new meshes and renumbering of the nodes. Any drop of water level in the two-dimensional domain results in eliminating nodes and elements.

c. A new module which is capable of performing 1 dimensional hydrodynamic analysis using finite difference method in a 2 dimensional finite element model is developed. Thus, initial water surface elevation calculated from 1 dimensional model can be used as the initial elevation of the 2 dimensional model by assigning the computed elevation to each node of the 2 dimensional model. And simulation results from both 1 and 2 dimensional model can be displayed and compared.

d. In order to extract necessary cross section data for 1 dimensional hydrodynamic model from 2 dimensional finite element meshes, an algorithm is developed for producing HEC-2 data as well as the relations between bottom elevation and channel width. And a linkage module that is capable of assigning simulation results estimated by 1 dimensional model to the nodes of 2 dimensional model is also developed.

e. To verify application of developed model, various types of flow analysis that include two dimensional dam-break flow including floodplain, trapezoidal cross section, adverse dam break flow, and transcritical f10w are performed. The accuracy of the developed model is verified with comparison between simulations and measured value.

f. The developed model is based on Streamline Upwind/Petrov-Galerkin finite element method and Boussinesq’s eddy viscosity theory. The method developed in the study is depth-averaged mixing length model which assumes anisotropic and local equilibrium state of turbulence.

g. Several numerical simulations were carried out, which examined the performance of the turbulence model for the purpose of sensitivity analysis. Artificial channels that appear horizontal flow and vertical flow were carried out. Validation and verification were performed by comparing with analytical solution and observation data. The simulation on the Han river were performed for tests. The results were compared with the observation data. The suggested model displayed reasonable flow distribution compare to the observation data.

h. To verify application of developed RAM2 model in the study, it applied for a dry condition channels at Milyang river, Kumho river, Gamchun confluent, Paldang-dam downstream and the effect of tide region that Youngsan estuary-dam basin, Han river downstream. This model verified accuracy of results by comparing with existing commercial use model and measured values.

i. To verify application of the developed model, the model was applied to natural rivers with wetting and drying domain areas such as Han river and Nakdong river. The simulation results have shown good agreements with observed data and the results for the developed model were more accurate and improved stability of numerical computation than those of RMA-2 model.

j. If the analysis of contaminant advection-diffusion and sediment transport are performed with the study results, the results can be effectively applied to river flow analysis and ecological hydraulics.

2) Pollutant transport analysis system(RAM4)

To prepare the commercialization of the RAM4 software, a poll was taken from over 100 institutions to find out the strengths 하ld weakness of the RAM4 program. The mass input function and contaminant input for inner mesh has been considered its strength. Applying the needs of the actual future users, the RAM4 program has added the BOO /00 co-related simulation, water temperature simulation, and has established a mathematical model for the simulation of SS. If the software was distributed as shareware, 85% of the SMS program users have answered that they would use this software. So the target market is susceptible to the distribution of the new software.
A mathematical model was established for the BOD/DO co-related simulation and water temperature simulation. The mathematical model for the diffusion of these factors varies from 1D to 3D and each model has different concepts and characteristics. The 2D advection-dispersion equation is mostly used for these attempts. In this research a response term was added to the general equation for the erosion, sedimentation to analyze the movement of floating material. Also the OD/DO co-related simulation and water temperature simulation added a response term for the mathematical model.
To assess the mass conservation for the RAM4 a estimated equation was derived from the general equation and the mass input problem was simulated for the rectangular channel and similar 20 flow velocity field. For the point input example, research was done on the effects of flow direction and mesh construction. The Galerkin method and SUPG method were compared for the mass conservation check. Results showed that with small Pe numbers the mass conservation was complete but higher numbers led to a 5% conservation error. In these cases a finer mesh will solve the problem.
With cooperation of Warwick University of England and Toyko Institute of Technology we have applied the RAMS program to several other channels and natural streams, to prove the applicability of the RAMS program. Further verifications were done on numerical simulations on bar type, diamond, circular channels on various Froude numbers. Also the RAMS program was applied to the Tone river in Japan for the applicability of the 2d general hydrodynamic model.
Applied simulations to the Han River, Nakdong River, Hyungsan River and Yeongsan River was done for the dispersion of contaminants for the range of the spread area. Since we’ve prepared to launch the RAMS commercial version, tests are made focusing on huge mesh size (more than 15,000 nodes in Han River) and tidal boundary condition (Han River and Yeongsan River). For the Nakdong River the flow rate, water elevation and crossing length were measured on the field for data for geography, boundary conditions, and verification.
Using RAM2 the flow velocity field of Mulgeum intake facility was analyzed and RAM4 was used for the simulation of contaminant accidents at the Daepo and Sogam river. An ADCP was used to compare and verify the RAM2 results, and RAM4 verification was done by BOD, TN, TP data measured in Nakdong River. A hypothetical scenario was created to find the contaminant dispersion characteristics in the river. The data simulated did not have a absolute match, but the results showed well the 2D flow characteristics of the measured data.

3) Bed elevation change analysis system(RAM6)
The developed program will be applied to more various real and natural cases, like as natural channel, floodplain, dam, waterway, pier and weir, etc. Through the verification and estimation of developed program, and the additional research, more practical and stable analysis system will be developed.

4) RAMS-GUI System
- Development of graphic engine for enhanced performance of preprocessor
- Development of integrated GUI between preprocessor and postprocessor
- Development of advanced front method for mesh generation
- Analysis of needs and requirement about RAMS beta version
- Refactoring RAMS beta version
(출처 : SUMMARY 19P)

목차 Contents

• 표지 ... 1
• 제출문 ... 3
• 보고서 요약서 ... 5
• 요약문 ... 7
• SUMMARY ... 19
• 목차 ... 27
• CONTENTS ... 30
• 제1장 연구개발과제의 개요 ... 33
• 제1절 연구개발과제의 목적 ... 33
• 1. 하천흐름해석시스템(RAM2) ... 33
• 2. 하천수질해석시스템(RAM4) ... 34
• 3. 하상변동해석시스템(RAM6) ... 35
• 4. 범용 하천흐름/수질/하상변동 해석 GUI 모형 ... 35
• 제2절 연구개발의 필요성 ... 36
• 1. 하천흐름해석시스템(RAM2) ... 36
• 2. 하천수질해석시스템(RAM4) ... 36
• 3. 하상변동해석시스템(RAM6) ... 42
• 4. 범용 하천흐름/수질/하상변동 해석 GUI 모형 ... 42
• 제3절 연구개발의 범위 ... 44
• 1. 하천흐름해석시스템(RAM2) ... 44
• 2. 하천수질해석시스템(RAM4) ... 46
• 3. 하상변동해석시스템(RAM6) ... 48
• 4. 범용 하천흐름/수질/하상변동 해석 GUI 모형 ... 49
• 제2장 국내외 기술개발 현황 ... 52
• 제1절 하천흐름해석시스템(RAM2) ... 52
• 제2절 하천수질해석시스템(RAM4) ... 54
• 제3절 하상변동해석시스템(RAM6) ... 58
• 제4절 범용 하천흐름/수질/하상변동 해석 GUI 모형 ... 59
• 제3장 연구개발 수행내용 및 결과 ... 68
• 제1절 RAM2 해석엔진의 개선 및 소프트웨어 검중 ... 68
• 1. 해석엔진의 최종점검 및 확장 ... 68
• 2. 개발 모형 적용 ... 105
• 3. 실제유역에 대한 모형의 적용 및 검증 ... 154
• 4. 수공구조물이 설치된 하천구간 적용 ... 228
• 5. 보가 설치된 하천구간 적용 ... 235
• 6. 연구결과 ... 260
• 제2절 RAM4 해석엔진의 개선 및 소프트웨어 검증 ... 263
• 1. 해석엔진의 개선 ... 263
• 2. 소프트웨어의 검증 ... 308
• 제3절 RAM6 해석엔진의 개선 및 소프트웨어 검증 ... 407
• 1. 해석엔진의 개선 및 적용성 확장 연구 ... 407
• 2. RAM6 흐름모형의 검증 ... 416
• 3. RAM6 하상변동 모형의 검증 ... 434
• 제4절 RAMS GUI의 개선 및 최종점검 ... 459
• 1. RAMS 개발 방법론 정의 ... 459
• 2. RAMS 개발 프로세스 정의 ... 462
• 3. RAMS 개발 문서화 체계 수립 ... 468
• 4. RAMS 개발을 위한 사용자 요구분석 ... 470
• 5. Mesh generation 기반기술 개발 및 모듈 설계 ... 473
• 6. Mesh Creation 및 Editing 기술 구현 ... 484
• 7. RAMS 입력자료 생성 모듈 개발 ... 505
• 8. RAMS Preprocessor 개발 ... 519
• 9. RAMS Postprocessor 개발 ... 526
• 10. GUI의 개선 ... 544
• 11. GUI의 최종점검 ... 562
• 제5절 RAMS 상용화 ... 564
• 1. 국제교류 및 공동연구 ... 564
• 2. 사용자 불편사항 조사 ... 577
• 3. RAMS 베타버전 출시 및 워크숍 ... 580
• 4. RAMS 홈페이지 운영 및 관리 ... 582
• 5. 사용자 교육 콘텐츠 작성 ... 584
• 6. RAMS 홍보 ... 588
• 제4장 목표달성도 및 관련분야에의 기여도 ... 609
• 제1절 하천흐름해석시스템(RAM2) ... 609
• 제2절 하천수질해석시스템(RAM4) ... 612
• 제3절 하상변동해석시스템(RAM6) ... 614
• 제4절 범용 하천흐름/수질/하상변동 해석 GUI 모형 ... 616
• 제5장 연구개발결과의 활용계획 ... 617
• 제1절 하천흐름해석시스템 (RAM2) ... 617
• 제2절 하천수질해석시스템(RAM4) ... 618
• 제3절 하상변동해석시스템(RAM6) ... 619
• 제4절 범용 하천흐름/수질/하상변동 해석 GUI 모형 ... 620
• 제6장 연구개발과정에서 수집한 해외과학기술정보 ... 621
• 제1절 하천흐름해석시스템(RAM2) ... 621
• 제2절 하천수질해석시스템(RAM4) ... 621
• 제3절 하상변동해석시스템(RAM6) ... 622
• 제4절 범용 하천흐름/수질/하상변동 해석 GUI 모형 ... 622
• 제7장 참고문헌 ... 624
• 끝페이지 ... 633