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장재호 ( Jae Ho Jang ),강형식 ( Hyeong Sik Kang ),정광욱 ( Kwang Wook Jung ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.6
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 measure 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 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.
SWAT모형을 이용한 유량 및 유사 예측 정확성 평가 및 최적관리 기법 효과 분석
이지민,류지철,강현우,강형식,금동혁,장춘화,최중대,임경재,Lee, Ji-Min,Ryu, Ji-Chul,Kang, Hyun-Woo,Kang, Hyeong-Sik,Kum, Dong-Hyuk,Jang, Chun-Hwa,Choi, Joong-Dae,Lim, Kyoung-Jae 한국농공학회 2012 한국농공학회논문집 Vol.54 No.1
Soil erosion and sediment from agricultural farmland has caused various negative impacts on environment in recent years. The effect of rice straw mat on soil erosion has been investigated by many researchers these days. In this study, the SWAT model was applied to Hongcheon watershed to evaluate SWAT flow and sediment, and the effect of rice straw mat on sediment yield at watershed outlet was evaluated. The Nash-Sutcliffe model efficiency (NSE) and coefficient of determination ($R^2$) values for flow simulation (calibration period) were 0.66 and 0.67, and the NSE values for sediment was 0.90. The calibrated parameters were used to analyze the reduction of sediment yield in the farmland with rice straw mat. Average daily sediment yield without rice straw mat was 49.8 ton/day and sediment yield with rice straw mat was 25.5 ton/day, and the reduction rate was 38.7 %. Also, average daily sediment yield with/without rice straw mat were 97.5 ton/day and 190.7 ton/day during the rainy season (Jun. 2008 - Aug. 2009), with the reduction rate 46.3 %.
국토환경에 대한 정책관 형성의 영향요인: 낙동강 대권역 47개 지자체 실무자를 대상으로 한 실증분석
조성철 ( Cho Sung Chul ),강형식 ( Kang Hyeong Sik ) 한국지방행정연구원 2017 地方行政硏究 Vol.31 No.1
본 연구는 국토환경에 대한 정책실무자의 관점을 보전주의와 개발주의로 구분하고 이에 대한 개인적·조직적·사회적 요인의 효과를 추정한다. 개인적 요인으로서 환경에 대한 가치관 및 지식의 역할을 고찰했으며, 조직적 요인으로서 소속부서와 지자체의 환경효능감 및 환경지식 수준의 역할을 검토했다. 사회적 측면에서는 지역 시민사회의 환경문제 협력 전망 및 환경 관련 갈등 수준이 영향을 미치리라 가설을 설정하였다. 이러한 가설을 실증하기 위해 낙동강 대권역에 소속된 47개 지방자치단체에서 1,037명의 공무원 표본을 수집하였다. 분석 결과, 생태중심적 가치관은 각 공무원이 보전주의적인 정책관을 갖는 데에 강한 영향을 미쳤고, 인간중심적 가치관은 개발주의 정책관과 강하게 상관되었다. 조직 수준에서는 각 지자체가 환경문제에 의미 있는 기여를 할 수 있다고 믿는 효능감의 정도가 소속 공무원들의 보전주의 정책관 수준에 통계적으로 유의한 상관성을 나타내었다. This study examines the antecedents of public officials` policy stance on environmental issues. To this aim, we collected a survey sample of 1,037 public officials from 47 local governments in Nakdong river basin. Regression analyses showed that public officials` environmental values, conceptualized via ecocentric and anthropocentric perspectives, were positively and significantly correlated with their policy stance on environmental issues. The perceived organizational efficacy, which refers to a belief that governments` policy efforts can make a significant difference for the sake of environment, also turned out to be positively significant in influencing individuals` policy stance on environmental issues.
구윤모 ( Yoon Mo Koo ),강형식 ( Hyeong Sik Kang ),이미숙 ( Mi Suk Lee ) 한국환경생태학회 2014 한국환경생태학회지 Vol.28 No.1
본 연구는 최근 홍천강의 생태적 기능을 되살리기 위해 계획 중인 생태하천 복원사업의 경제적 편익을 정량적으로 추정하는 것을 목적으로 하고 있다. 생태하천 복원사업의 결과물은 시장에서 거래되는 재화가 아니기 때문에 가격을 이용한 가치 측정에 어려움이 있으므로, 사용가치 및 비사용 가치에 대한 지불의 사액을 분석하는 조건부 가치측정법을 적용하였다. 또한 지불의 사액이 0인 응답자들을 고려한 스파이크 모형을 추가적으로 이용하였다. 분석 결과 사업지 인근에서는 가구당 연간 3,300원~4,628원, 비사업지에서는 가구당 연간 1,308원~2,929원의 지불의사가 있었다. 이를 우리나라 전체로 확대할 경우, 홍천강 생태하천 복원사업의 경제적 편익은 현재가치로 약 976억 원~2,163억 원에 이를 것으로 판단된다. The goal of this study is to estimate economic benefit of restoring ecological stream of Hong Cheon river. The benefit is determined by estimating willingness-to-pay for the value of Hong Cheon river because it is a non-market good which is difficult to be measured in terms of monetary value. Specifically, the spike model, one of the contingent valuation methods, is used to distinguish respondents having zero willingness-to-pay for Hong Cheon river. The results show that a household located near the Hong Cheon river is willing to pay 3,300~4,628 Korean Won per year, while a household not located near the Hong Cheon river is willing to pay 1,308~2,929 Korean Won per year. Thus, total benefit of restoring ecological stream of Hong Cheon river is estimated as 97.6~216.3 billion Korean Won.