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SWAT 모형을 이용한 시.공간적 토지 이용변화에 따른 유량 및 유사량 특성분석
신용철,임경재,김기성,최중대,Shin, Yong-Chul,Lim, Kyoung-Jae,Kim, Ki-Sung,Choi, Joong-Dae 한국관개배수위원회 2007 한국관개배수논문집 Vol.14 No.1
In this study, the Soil and Water Assessment Tool (SWAT) model was used to assess spatiotemporal effects on watershed runoff and sediment characteristics due to land uses changes from 1999 to 2002 at the small watershed, located in Chuncheon-si, Gangwon province. The annual average flow rate of Scenario I (long-term simulation using land use of 1990), II (long-term simulation using land use of 1996), III(long-term simulation using land use of 200) and IV(simulation using land use of 1990, 1995, and 2000) in long-term simulation) using the SWAT model were 29,997,043 m3, 29,992,628 m3, 29,811,191 m3 and 29,931,238 m3, respectively. It was shown that there was no significant changes in estimated flow rate because no significant changes in land uses between 1990 and 2000 were observed. The annual average sediment loads of Scenarios I, II, III and IV for 15 year period were 36,643 kg/ha, 45,340 kg/ha , 27,195 kg/ha and 35,545 kg/ha, respectively. The estimated annual sediment loads from Scenarios I, II, and III, were different from that from the scenario IV, considering spatio-temporal changes in land use and meterological changes over the years, by 10%, 127%, and temporal changes in land use and meterological changes over the years, by 10%, 127%, and 77%. This can be explained in land use changes in high soil erosion potential areas, such as upland areas, within the study watershed. The comparison indicates that changes in land uses upland areas, within the study watershed. The comparison indicates that changes in land uses can affect on sediment yields by more than 10%, which could exceed the safety factor of 10% in Total Maximum Daily Loads (TMDLs). It is, therefore, recommended that not only the temporal analysis with the weather input data but also spatial one with different land uses need to be considered in long-term hydrology and sediment simulating using the SWAT model
FRAGSTATS 모형을 이용한 도암댐 유역의 산림 파편화 분석
허성구 ( Sung Gu Heo ),김기성 ( Ki Sung Kim ),안재훈 ( Jae Hun Ahn ),윤정숙 ( Jong Suk Yoon ),임경재 ( Kyoung Jae Lim ),최중대 ( Joong Dae Choi ),신용철 ( Yong Chul Shin ),유창원 ( Chang Won Lyou ) 한국지리정보학회 2007 한국지리정보학회지 Vol.10 No.1
강원도 평창군에 위치한 도암댐 유역은 인간의 개발행위에 따른 산림지역 파편화로 인해 산림지역의 상당부분이 농업/도시 지역으로 변화되어 왔다. 이러한 토지이용변화로 인해 하류 수역에서는 많은 부정적인 영향이 발생하고 있다. 그러나 토지이용변화가 도암댐 유역내 경관에 미치는 영향을 과학적인 분석 툴을 이용하여 수계단위로 분석한 예는 그리 많지 않다. 따라서 본 연구에서는 산림의 파편화가 경관에 미치는 영향을 정량적으로 분석하기 위하여 경관분석 프로그램인 FRAGSTATS를 이용하였다. 복잡한 계산식으로 구성된 경관지수를 자동으로 산출해주는 FRAGSTATS 프로그램은 경관분석에 많이 이용해 왔으나, 각 경관지수별 설명이 충분하지 않아 FRAGSTATS를 처음 사용하는 사용자가 이를 이용하여 정량적 경관분석을 수행하기에는 다소 어려움이 있어 왔다. 따라서 본 연구에서는 경관 파편화가 발생하기 전과 후의 가상적이면서 단순화 된 경관을 구성하여 경관지수를 설명하였다. 본 연구에서 기술된 경관지수를 이용하여 도암댐 유역내에서 산림 파편화가 경관에 미치는 영향을 정량적으로 평가하였다. 총 19개 소유역중 S1 유역이 1985년부터 2000년까지 가장 많은 산림 파편화가 진행된 것으로 분석되었다. 본 연구의 결과는 산림지역의 파편화, 이에 따른 토지이용변화가 수질에 미치는 영향을 수계단위로 평가하는데 매우 유용하게 사용될 수 있으리라 판단되며, FRAGSTATS과 같은 경관분석 프로그램의 결과를 바탕으로 한 환경친화적 토지이용계획을 수립하는데 매우 유용하리라 판단된다. The Doam-dam watershed, located at Kangwon Province, Korea, has been experiencing significant changes in land uses, conversion from forest to agricultural/urban areas, with human involvements. However, no thorough investigation of the landscape impacts of land use changes was performed at this watershed using the scientific analytical tool. Thus, the FRAGSTATS model was utilized to quantitatively analyze the landscape impacts of forest fragmentation in this study. To provide the detailed explanations for 11 landscape indices considered in this study, two artificial and simplified landscapes, before and after fragmentations, were constructed. Using these 11 indices, the landscape impacts of forest fragmentation in 19 subwatersheds of the Doam-dam watershed were analyzed. The S1 subwatershed, one of 19 subwatersheds of the Doam-dam watershed, was found to have experienced the significant forest fragmentation from 1985 to 2000 based on landscape analysis using the FRAGSTATS model. The results obtained in this study can be used to evaluate the water quality impacts of forest fragmentations/land use changes at watershed scale level, and establish environment-friendly land use planning based on the results obtained using landscape analytical tool, FRAGSTATS.
김영익,연규석,최중대,김기성,서지연,김용성,Kim, Young-Ik,Yeon, Kyu-Seok,Choi, Joong-Dae,Kim, Ki-Sung,Seo, Ji-Yeon,Kim, Yong-Seong 한국농공학회 2011 한국농공학회논문집 Vol.53 No.2
This study was performed to evaluate the water purification properties of bio-composites planting blocks using oyster shell and effective microorganism that have high absorption ability of heavy metals and organics to develop environmentally friendly river embankment technique contained various factors such as oyster shells, effective microorganism, porous concrete and planting embankment block. To maximize greening effect, the seeds were arbitrarily sown. In addition, in order to analyze the effect of water quality purification after the planting, the samples were collected from each designated zone 1, 7 and 30 days after steeping in water. Then, the samples were analyzed in terms of seven test items such as SS, BOD, COD, T-N, T-P, pH, etc. on the basis of the test method for water pollution. The following conclusions were reached from the test result. As a result of analysis for water quality purification for the concrete block containing the effective microorganism, it was found that the values for SS, BOD, T-N and T-P for the sample taken after 30 days were lower than the initial values, which indicated that the water purification effect had been created. The result of the water quality purification analysis for the concrete block containing oyster shell showed that the values for SS, BOD, COD and T-P for the sample taken after 30 days were lower than the initial values which also indicated that it had been effective in water quality purification.