• 대한원격탐사학회지
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• 제2권2호
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• pp.117-131
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• 1986

The purpose of this study was to develop techniques acquiring hydrologic parameters that affect runoff conditions from Landsat imagery. Runoff conditions in a study area were analyzed by employing the U.S. Soil Conservation Service(SCS) Method. SCS runoff curve numbers(CN) were estimated by the computer analysis of Landsat imagery and digiral terrain model(DTM) data. The SCS Method requires land use/cover and soil conditions of the area as input parameters. A land use/cover map of 5 hydrological classes was produced from the Landsat multi-spectral scannerr imagery. Slope-gradient and contour and contour maps were also made using the DTM topographic data. Inundation areas depending on reservoir levels were able to be mapped on the Landsat scene by combining the contour data.

• 한국수자원학회논문집
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• 제32권5호
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• pp.515-524
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• 1999

본 연구는 토양수분의 공간적 분포를 고려하는 과정에서 TOPMODEL이 가지고 있는 구조상의 문제를 해결하는 방안을 제시한다. 포화초과유출을 모의하는 기존 TOPMODEL은 유출모의시 유역내 포화부분의 공간적인 정보를 반영하는 과정에 있어 포화면적의 연결성을 고려한 유출 알고리즘의 개발로 발전되었다. 개발된 알고리즘은 TOPMODEL의 매개변수를 증기시키지 않고 개선된 유출경로 추적의 근거를 제시함으로써 모형의 합리성과 적용성을 제고시켰다. 본 연구에서 개발된 포화면적 연결모형과 기본적인 통계적 입력모형형태의 TOPMODEL을 국제수문개발계획 대상유역인 위천유역내의 동곡소유역에 적용한 결과 본 연구에서 개발된 포화면적 연결모형이 다른 두 모형에서 발생하는 모의시 과도첨두유량계산의 문제를 해결할 수 있었다.

• 한국관개배수논문집
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• 제18권2호
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• pp.3-14
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• 2011

Increased impervious surfaces alter stream hydrology resulting in lower flows during droughts and higher peak flows during floods. Not only urban area but also rural area has been expanded impervious surfaces because of increasing of greenhouses. The main objective of this study was to evaluate the performance of the AnnAGNPS (Annualized Non-Point Source Pollution Model) on the surface runoff characteristics of the Daejeon-Stream watershed, and to predict the hydrological effects due to increasing of impervious surfaces. The model parameters were obtained from the geographical information system (GIS) databases, and additional parameters calibrated with the observed data. The model was calibrated by using 2004 of the runoff data and validated by using 2002 data obtained from WAMIS (Water Management Information System) to compare the simulated results for the study watershed. R2 values and efficiency index (EI) between observed and simulated runoff were 0.78 and 0.80, respectively at the calibration period. In this study, expanding of impervious surfaces such as greenhouses caused increasing of surface runoff, but caused decreasing of total nitrogen and total phosphorus loads.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.539-542
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• 2006

To investigate the streamflow impact of land cover changes by a typhoon, WMS HEC-1 storm runoff model was applied by using land cover information before and after the typhoon. The model was calibrated with three storm events of 1985 to 1988 based on 1985 land cover condition for a 192.7 $km^2$ watershed in northeast coast of South Korea. After the model was tested, it was run to estimate impacts of land cover change by the typhoon RUSA occurred in 2002 (31 August - 1 September) with 897.5 mm rainfall. The land covers before and after the typhoon were prepared using Landsat 7 ETM+ of September 11 of 2000 and Landsat 5 TM of September 29 of 2002 respectively. For the 6.9 $km^2$ damaged area (3.6 % of the watershed), the peak runoff and total runoff by the changed land cover condition increased 12.5 % and 12.7 % for 50 years rainfall frequency and 1.4 % and 1.8 % for 500 years rainfall frequency respectively based on AMC (Antecedent Moisture Condition)-I condition.

• 상하수도학회지
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• 제22권6호
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• pp.697-704
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• 2008

Stormwater runoff from urban road area as non-point source has a tendency of including lots of pollutants at initial rain period. Recently, there are several cases of having installed treatment facilities for reducing pollution discharge from the impervious cover in urban area to prevent watershed environment from getting worse. The filtration type among non-point source treatment systems has been known as one of the most efficient system for treatment of non-point source pollutants. Therefore, various kinds of filter media such as expanded polypropylene(EPP), granular activated carbon, zeolite, perlite, illite, sand, gravel has been developed. This study was conducted to verify performance and hydraulic characteristics of filter media as measures for non-point source. The experiment was carried out to evaluate applicability and variation of 4 kind of most popular filter media(EPP, GAC, Zeolite, Perlite) in headloss with elapsed time and influent flow rate and to obtain data base that could be used to establish management plan for road runoff treatment. In experiment by tap water, it showed that EPP and perlite those are floatable materials showed stable operating performance and lower headloss than the others.

• 상하수도학회지
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• 제27권2호
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• pp.197-206
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• 2013

Recently, climate change causes climatic anomaly such as global warming, the typhoon and severe rain storm etc. and it brings damage frequently. Climate change and global warming are prevalent all over the world in this century and many researchers including hydrologists have studied on the climate change. In this study, Seonakdong river watershed in the Nakdong river basin was selected as a study area. Real-time monitoring system was used to draw the rating curves, which has 0.78 to 0.96 of $R^2$. To predict runoff change in Seonakdong river watershed caused by climate change, the change in hydrologic runoff were predicted using the watershed model, SWAT. As a result, the runoff from the Seonakdong river watershed was increased by up to 45 % in summer. Because of the non-point sources from the farmland and the urban area, the water quality will be affected by the climate change. In this study, the operating plan of the water gates in Seonakdong river will be suggested by considering the characteristics of the watershed runoff due to the climate change. The optimal watergate opening plan will solve the water pollution problems in the reservoir-like river.

• 한국방재학회 논문집
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• 제7권1호통권24호
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• pp.57-66
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• 2007

본 연구에서는 WMS를 이용하여 소유역 분할에 따른 수문지형정보의 변화와 강우-유출모의를 통한 효과적인 분할방법을 제공하는데 있다. 대상유역은 금강수계의 미호천 유역으로 선정하였으며 유역의 분할 방법은 유역면적, 하천경사, 하천연장에 대하여 분할하였다. 소유역 분할 방법에 대한 유역의 수문학적 적용은 Clark 단위도법, SCS 무차원단위도법, Snyder 단위도법으로 실제 관측수문곡선과 비교하였다. 적용결과 유역면적에 의해 5개의 소유역으로 분할할 경우에 SCS 단위도법이 가장 좋은 결과를 나타났으며, 본 연구는 미호천유역의 유출변동에 대한 기초 자료로 활용될 수 있다.

• 대한원격탐사학회지
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• 제22권5호
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• pp.407-413
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• 2006

To investigate the streamflow impact of land cover changes by a typhoon, HEC-l storm runoff model was applied by using land cover information before and after the typhoon. The model was calibrated with three storm events of 1985 to 1988 based on 1985 land cover condition for a $192.7km^{2}$ watershed in northeast coast of South Korea. After the model was tested, it was run to estimate impacts of land cover change by the typhoon RUSA occurred in 2002 (31 August-1 September) with 897.5 mm rainfall. The land covers before and after the typhoon were prepared using Landsat 7 ETM+ of September 11 of 2000 and Landsat 5 TM of September 29 of 2002 respectively. For the $6.9km^{2}$ damaged area (3.6 % of the watershed), the peak runoff and total runoff by the changed land cover condition increased 12.5 % and 12.7 % for 50 years rainfall frequency and 1.4 % and 1.8 % for 500 years rainfall frequency respectively based on AMC (Antecedent Moisture Condition)-I condition.

• 상하수도학회지
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• 제26권1호
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• pp.55-68
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• 2012

Impervious surface increase due to urbanization, one of the leading causes of pavement increased the runoff coefficient, peak flow, and reducing the infiltration flow and thereby causing flooding and river erosion is occurring in aquatic ecosystems are known to impair. This study aimed to classify use type of detailed land into the road, reststop, tollgates and etc. focused on major domestic highways, to understand the characteristics of rainfall runoff pollutants and to calculate applicable unit pollution load. Because of high runoff coefficient and short travel time to drainage. first flush occurred clearly. Average EMCs of runoff in the highway was investigated as TSS 108.47 mg / L, COD 28.16 mg / L, BOD 13.61 mg / L, TN 6.38 mg / L, TP 0.03 mg / L, Cu 118.17 ${\mu}g$ / L, Pb 345.3 ${\mu}g$ / L, Zn 349.47 ${\mu}g$ / L. Unit pollution loads calculated by detailed land use area of highways based on average annual rainfall, EMCs, applicable basin areas and etc. were 46.6 kg/km2/day of BOD, 1.4 kg/km2/day of TP, 8.81 kg / km2/day of TN and these were BOD 50.8%, TP 66.7%, TN 64.4%in comparison of the unit pollution loads which applies fallow land standards of the TMDL(Total Maximum Daily Load). It was considered that discharged loads can be excessively calculated in case highway non-point management plans based on unit pollution load of the current land standard.

• 한국수자원학회논문집
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• 제31권2호
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• pp.199-208
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• 1998

유역의 지형특성에 근거를 두고 유출기여면적의 변화를 고려한 분포형 모형인 TOPMODEL을 이용하여 홍수유출해석에 대한 적용성을 연구하였다. 건설교통부에서 설치운영중인 위천대표시험유역의 소유역인 동곡 및 고로지점을 분석대상유역으로 선정하였으며, 1/25,000 지형도를 이용하여 수치고도지도를 작성하였고 지형인자분석은 지리정보 시스템 도구인 Arc/Info를 이용하였다. 두 소유역의 지형상수가 서로 비슷하였고 각 연도별 동일호우사상에 대한 모형매개변수도 서로 유사한 특성을 나타내었다. TOPMODEL을 이용한 홍수유출에 대한 첨두유량의 모의 결과는 관측치와 비교할 때 그 재현성이 매우 우수하였다. 격자의 크기별로 유역을 분할하고 그에 따른 첨두유량과 발생시각의 변화를 동곡소유역은 100,120,240m, 고로유역은 120,200,360m 격자로서 분석한 결과 두 유역 모두 격자 크기의 증가에 따라 첨두유량은 증가하고 발생시각은 격자의 크기와 관계없이 일정한 것으로 나타났다.