• 농촌계획
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• 제7권1호
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• pp.3-13
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• 2001

In an effort to effectively manage and evaluate a water environment at a small watershed, a decision support system for a water environment management and evaluation has been developed. This paper described the overall features and functions of the water environment management and evaluation systems (WEMES) for environmental management, conservation, and evaluation at a small watershed. WEMES consisted of fore subsystems: data, simulation model, evaluation model, and user interface. Each of the systems were briefly described. And special features like simulation and evaluation models were also introduced.

• 농업과학연구
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• 제47권4호
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• pp.885-901
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• 2020

A forest watershed management project was introduced in 2004 to develop ecologically sound forest watersheds. It includes landslide prevention and erosion control, water resource management, landscape development, and forest resource management. However, it has been managed fragmentarily and inefficiently, far from the original intents. This study investigated current status, problems, and improvement measures of the project. Literature reviews were conducted on forest watershed management in Korea and other countries, and surveys were conducted on 201 erosion control experts. When introduced, the forest watershed management project was well planned and implemented as intended. It later turned to focus only on disaster prevention such as erosion control dams and stream conservation measures. The survey results showed that a majority (89% and 86%) of surveyees wanted increases in the project period and budget. They also responded that conflicts with local residents (51%) and determining project locations (32%) were the most difficult tasks when implementing the projects, and only 36% kept project records. To plan and implement the projects as intended, the following suggestions should be considered: (1) establishment of a solid legal foundation and improvement of the erosion control practices law; (2) increase in the project period (from 1 to 2 - 3 years) and budget; (3) development of a manual for project site selection and guidelines; (4) monitoring and systematic information management; and (5) development of spatial analysis tools for watershed analysis and management.

• 한국물환경학회지
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• 제32권5호
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• pp.450-457
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• 2016

The Total Maximum Daily Load (TMDL) is a watershed management system that involves the establishment of the target water quality, the calculation of permission loading (allocation loading), and the control of total pollutants for each unit watershed. Allocation loading is assessed through the comprehensive implementation assessment of the previous year's plan. Assessment results are used for follow-up management measures such as the limit of development and updating of TMDL Management Implementation Plans for the next planning period. Although detailed assessment criteria are important, they are not currently available. Therefore, we suggested assessment criteria by comparing two methods('integration method' and 'separation method') using combination point and non-point discharge loading. We also examined the penalty criteria considering controllable load local government and updating methods of the TMDL Management Implementation Plan for the next planning period.

• 농촌계획
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• 제7권1호
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• pp.15-25
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• 2001

This paper described the overall operations and applications of the water environment management and evaluation systems (WEMES) for environmental management, conservation, and evaluation for a small watershed. WEMES was to be applied with field data from small watersheds ranging from 0.4 to 29.79km2 in size which have steep topography and complex landuses. WEMES was a computer aided decision support system, that was comprised of the database subsystem, the simulation model subsystem, the environmental evaluation model subsystem, and the graphic user interface subsystem that visualizes the simulated results. The water environment management and evaluation with WEMES was successfully performed.

• 한국물환경학회지
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• 제28권6호
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• pp.819-832
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• 2012

HSPF model based on BASINS was applied for the Hwaseong Reservoir watershed (HRW) to evaluate the feasibility of water quality management. The watershed was divided into 45 sub-basins considering various watershed environment. Streamflow was calibrated based on the measured meteorological data, discharge data of treatment plants and observed streamflow data for 2010 year. Then the model was calibrated against the field measurements of water qualities, including BOD, T-N and T-P. In most cases, there were reasonable agreements between observed and predicted data. The validated model was used to analyze the characterization of pollutant load from study area. As a result, Non-point source pollutant loads during the rainy season was about 66~78% of total loads. In rainy-season, water quality parameters depended on precipitation and pollutant loads patterns, but their concentration were not necessarily high during the rainy season, and showed a decreasing trend with increasing water flow. As another result of evaluation for load duration curves, in order to improve water qualities to the satisfactory level, the watershed managements considering both time-variant and pollution sources must be required in the HRW. Overall, it was found that the model could be used conveniently to assess watershed characteristics and pollutant loads in watershed scale.

• 한국물환경학회지
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• 제32권4호
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• pp.349-356
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• 2016

Total Maximum Daily Loads (TMDLs) System has been used to improve water quality in the Youngsan·Tamjin river basin since 2004. The Basic Policy of TMDLs sets up the standard flow based on the average dry condition or mid-range flow during the last 10 years. However, Target Water Quality (TWQ) assessment on TMDLs has been used to evaluate water quality through eight-day intervals over 36 times a year. The results for allocation evaluation and target water quality evaluation were different from each other in the same unit watershed during the first period. In order to improve the evaluation method, researchers applied Load Duration Curve (LDC) to evaluate water quality in nine unit watersheds of the Youngsan·Tamjin river basin. The results showed that achievement rates of TWQ assessment with the current method and LDC were 67~100% and 78~100%, respectively. Approximately 11% of the achievement rates with use of LDC were higher than those with use of the current method. In conclusion, it is necessary to review the application of the LDC method in all Four Major River Watersheds.

• 한국수자원학회논문집
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• 제39권2호
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• pp.161-178
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• 2006

유역통합관리의 이론을 적용한 의사결정지원 시스템을 구축하기 위해서는 Heathcote (1998)가 제안한 다음과 같은 7단계를 수행하는 것이 바람직하다. 단계별 절차는 (1) 대상유역에 대한 정보수집, (2) 문제점 도출 및 우선 순위의 결정, (3) 분명하고 구체적인 목표의 설정, (4) 모든 대안의 제시, (5) 가능한 대안의 선별, (6) 선별된 대안의 효과분석, (7) 최종대안의 수립으로 이루어져 있으며 본 연구는 $1\~5$단계의 과정에 해당된다. 1단계에서는 유역의 물순환에 대해 현장답사 및 문헌조사 등을 통하여 구체적이고 정량적인 정보를 수집하였으며 2단계에서는 중 유역 별로 다양한 지수(홍수피해 잠재능, 건천화 잠재능, 수질오염 잠재능) 및 유역평가 지수를 이용하여 치수, 이수, 수질 측면에서 각각 또는 종합지역으로 문제가 되는 중 유역을 도출하였다. 3단계에서는 유역통합관리 측면에서 우선적으로 고려되어 할 중 유역을 제시하였으며 이를 해결하기 위한 핵심목표를 건천화 방지로 선정하였고 수질개선, 홍수피해 저감의 효과도 고려하는 것으로 하였다. 4단계에서는 이를 위한 구조적, 비구조적 방아을 포함하는 제안들을 제시하였으며 5단계에서는 남아있는 대안에 대해 기술적, 경제적, 환경적 가능성 등을 정성적으로 파악하여 실현 가능한 대안들을 선별하였다. 이렇게 선별된 대아들을 중 유역 별로 필요성 및 가능성을 검토하여 구체적인 예비타당성 계획을 수립하였다.

• 한국수자원학회논문집
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• 제55권7호
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• pp.481-494
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• 2022

본 연구는 미호천 유역의 월 단위 지하수위 관리 취약 시기 평가와 LSTM을 이용한 미래 지하수위 관리 취약 시기 평가 기법을 제안하였다. 미호천 유역 내의 지하수위 및 강수량 관측소 관측자료를 수집하고, LSTM을 구성한 후 강수량과 지하수위에 대한 2020~2022년 예측 값을 산정하고, 미래 지하수위 관리 취약시기 평가를 수행하였다. 지하수위 관리 취약시기 평가를 위하여 지하수위와 강수량 간의 상관관계를 고려한 가중치와 기후변화로 인한 관측자료의 변동을 고려하기 위한 가중치를 산정한 후, 이를 조합하여 최종 가중치를 산정하였다. 평가 결과 미호천 유역은 2월, 3월, 6월에 지하수위 관리 취약성이 높게 나타났고, 특히 천안수신 관측소 인근은 미래에 지하수위 관리 취약성 지수가 악화 될 것으로 분석되어 추가 관리 방안 도입이 필요할 것으로 나타났다. 본 연구의 결과는 지하수위 관리 취약 시기 평가 및 LSTM을 활용한 미래 예측 기법을 제시함으로써 발생할 수 있는 유역 내 지하수자원 문제에 선제적인 대응방안 도출에 기여할 것으로 기대된다.

• 한국물환경학회지
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• 제26권6호
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• pp.903-909
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• 2010

The purpose of this study was evaluated on the applicability of Load Duration Curve Method (LDC Method) using HSPF watershed model and sampling data for efficient TMDLs in Korea. The LDC Method was used for assessment pollutant characteristics in watershed and water quality variation in each water flow level. Load Duration Curve is applied for judge the level of impaired water-body and can be estimated the impaired level by pollutant, such as BOD, T-N, and T-P in this study depending on variation of stream flow. As a result, BOD, T-P was usually exceed the standard value at low flow and dry hydrologic period. Improvement of effluent concentration from WWTP and riparian buffer protection zone are effective to improve the water quality. T-N showed the worst condition at mid-range hydrologic period and moist hydrologic period. Therefore, soil erosion control program and BMPs for non-point source pollution control is effective for recovery the water quality, which can be useful method for management of water quality in the plan of recovery water quality spontaneously. Applicability of LDC Method was evaluated in the Nakbon A watershed. However, we need to consider more detailed and accumulated data set such as accurate GIS data and detail pollution data, and WWTP discharge water quality data for accurate evaluation of watershed. Overall, The LDC Method is adequate for evaluation of watersheds characteristics, and its application is recommended for watershed management and TMDL Implementation.

• 대한토목학회논문집
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• 제38권6호
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• pp.1013-1020
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• 2018

급속한 산업화와 인구증가에 따라 많은 사람들이 도시에서 살기 위해 이동하고 있다. 이러한 도시화는 건설 및 개발 활동에 따라 도심지내 불투수성 면적을 증가시키며, 이로 인해 지하수위가 낮아지고 유역내 첨두홍수량이 커지며 토양유실이 증가한다. 토양과 수자원을 보전하기 위해서 전세계적으로 유역 관리 사업이 시행되고 있다. 따라서 토양 및 수자원의 보전기술을 활용하여 전체 유역에 대하여 평가하는 것이 바람직하다. 본 연구에서는 한국, 대만 및 필리핀의 녹색건물인증제도(GBRS)의 물관리 관련 항목에 대하여 논의하였다. 또한 G-SEED(한국), BERDE(필리핀), EEWH(대만)의 용수관리 기술의 평가기준을 적용하고 비교하였다. 본 연구의 결과는 포괄적인 유역평가 시스템 개발에 활용될 것으로 기대된다. 정량적인 유역평가기준은 미래의 수자원 관련 잠재적 위험도를 파악하고 보다 효율적이고 효과적으로 대응할 수 있을 것으로 판단된다.