• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.711-714
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• 2008

The objective of this study is to analyze the relationship between the watershed characteristics and the critical duration of design rainfall. For estimation of critical duration, adjustment Huff's method and ILLUDAS urban runoff model were applied to urban 21 areas. Watershed characteristics such as area, channel length, channel slope, shape factor, and pipe density were used to simulate correlation analysis. The conclusions of this study are as follows; it is revealed that critical duration is influenced by the watershed characteristics such as pipe density, area and channel length. Also, multiple regression analysis using watershed characteristics is carried out and the determination coefficient of multiple regression equation shows 0.972.

• 상하수도학회지
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• 제34권6호
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• pp.503-512
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• 2020

Identifying the water circulation status is one of the indispensable processes for watershed management in an urban area. Recently, various water circulation models have been developed to simulate the water circulation, but it takes a lot of time and cost to make a water circulation model that could adapt the characteristics of the watershed. This paper aims to develop a water circulation state estimation model that could easily calculate the status of water circulation in an urban watershed by using multiple linear regression analysis. The study watershed is a watershed in Seoul that applied the impermeable area ratio in 1962 and 2000. And, It was divided into 73 watersheds in order to consider changes in water circulation status according to the urban characteristic factors. The input data of the SHER(Similar Hydrologic Element Response) model, a water circulation model, were used as data for the urban characteristic factors of each watershed. A total of seven factors were considered as urban characteristic factors. Those factors included annual precipitation, watershed area, average land-surface slope, impervious surface ratio, coefficient of saturated permeability, hydraulic gradient of groundwater surface, and length of contact line with downstream block. With significance probabilities (or p-values) of 0.05 and below, all five models showed significant results in estimating the water circulation status such as the surface runoff rate and the evapotranspiration rate. The model that was applied all seven urban characteristics factors, can calculate the most similar results such as the existing water circulation model. The water circulation estimation model developed in this study is not only useful to simply estimate the water circulation status of ungauged watersheds but can also provide data for parameter calibration and validation.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2007년도 정기총회 및 학술발표대회
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• pp.207-210
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• 2007

The accurate estimation of the area of individual landuse in each subbasin is crutial. However, because of the complication in landuse of an urban watershed, it is almost impossible to estimate the area of individual landuse in each subbasin by manual ways. For this reason, in this study, a systematic methodology is suggested to estimate individual landuse area of each subbasin using GIS. To construct data for applying GIS, CAD data including sewer layout and landuse are collected and converted into the GIS data such as shape files. An urban watershed, then, is divided into subbasins with respect to sewer layout and landuse. For each subbasin, the area of individual landuse including road areas are estimated by applying several GeoProcessing functions. The proposed methodology is applied to the Goon-Ja watershed in Seoul to demonstrate its applicability and it is concluded that the proposed methodology can estimate individual landuse properties efficiently and accurately.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2008년도 공동추계학술대회
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• pp.151-152
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• 2008

The planning and management of the watershed environment require huge amount of information regarding almost all aspects of natural and manmade features of the area. Until lately this study could be achieved through days of exhaustive surveys map generation and tedious calculations. Remote sensing and GIS provides huge temporal database for an area and GIS provides the powerful tool for spatial and non-spatial analysis of remotely sensed data. The paper highlights the assessment of land potentiality using weighed overlay analysis with drainage density, soil, slope and lineament, LULC map was used to identify the utilization area of the watershed. The arithmetic overlay analysis was performed with potential and utilization layer to assess the availability of land for the future development.

• 한국도시환경학회지
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• 제18권4호
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• pp.419-428
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• 2018

본 연구는 도시개발로 인하여 농촌에서 도시로 급격한 토지이용 변화를 겪은 신도시 지역의 수문변화 예측과 저감방안 도출을 목적으로 하였다. 대표농도경로(Representative Concentration Pathway, RCP) 기후변화 시나리오로 2100년까지 분석결과 강수량 증가가 유출고 증가에 직접적으로 기여함을 알 수 있었다. 기후변화와 함께 도시 용지 형태도 저영향개발(Low Impact Development; LID) 기법으로 적용한 식생체류지의 효율에 영향을 미쳤다. 서로 다른 도시 시설 용지를 결합하면 각 시설 용지 별 차이가 있는 저류 가능 강수량을 보완할 수 있고 첨두유출량 경감과 도달시간 지체를 유도할 수 있어 도시개발로 인한 수문 영향을 완화시킬 수 있는 새로운 접근이 될 수 있음을 제시하였다.

• 환경영향평가
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• 제12권5호
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• pp.359-367
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• 2003

The total pollution load management system of watershed has been implemented upon Special Law pertaining to the Han River Watershed Water Quality Improvement and Residents Support, Special Law pertaining to the Nakdong River Watershed Water Management and Residents Support, Special Law pertaining to the Youngsan River Watershed Water Management and Residents Support, and Special Law pertaining to the Seomjin River Watershed Water Management and Residents Support in Korea since 2002. But many other similar systems with total pollution load management system of watershed are being operated separately or independently, even though its purpose is nearly same with those of the total maximum pollutants load management in Law on Water Quality Environmental Protection, environmental impact assessment(EIA) in Law of Impact Assessment on Environment, Transportation and Disaster and Pre-environmental assessment of Environmental Policy Act. Therefore the contents of total pollution load management system of watershed and many other related systems could be overlapped and at some times have inconsistency among them. This study suggests first the integrated operation of total pollution load management system of watershed, EIA, pre-environmental assessment, urban planning, and sewage planning and secondly EIA system development by integration of EIA and pre-environmental assessment and strategic environmental assessment(SEA).

• 환경영향평가
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• 제16권1호
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• pp.79-87
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• 2007

The performance of a stream water quality analysis model depends upon many factors attributed to the geological characteristics of a watershed as well as the distribution behaviors of pollutant itself on a surface of watershed. Because the model run has to import the pollution load from the watershed as a boundary condition along an interface between a stream water body and a watershed, it has been used to introduce a pollution delivery coefficient to behalf of the boundary condition of load importation. Although a nonlinear regression model (NRM) was developed to cope with the limitation of a conventional empirical way, this an up-to-date study has also a limitation that it can't be applied where the pollution load washed off (assumed at a source) is less than that delivered (observed) in a stream. The objective of this study is to identify what causes the limitation of NRM and to suggest how we can purify the process to evaluate a pollution delivery coefficient using many field observed cases. As a major result, it was found what causes the pollution load delivered to becomes bigger than that assumed at the source. In addition, the pollution load discharged to a stream water body from a specific watershed was calculated more accurately.

• 한국습지학회지
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• 제19권4호
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• pp.491-500
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• 2017

하천수량은 하천의 수질, 생태환경보전에 있어 가장 근원적이고 기본적인 사항으로 매우 중요한 요소이다. 본 연구의 목적은 경기도 도심하천의 불투수면적률에 따른 하천수량 변화 원인 및 영향을 분석하여, 경기도 도심하천의 하천수량 확보 방안 및 하천관리 정책에 반영할 있는 자료를 제시하는 것이다. 이를 위해 안양천유역, 탄천유역, 오산천유역을 표본 도심하천으로 선정하고, 불투수면적률(%ISA)에 따른 하천수량 및 수질의 변화와 직 간접적인 하천수 확보방안을 검토하였다. 그 결과를 정리하면 다음과 같다. 안양천유역, 탄천유역, 오산천유역의 불투수면적률은 2014년을 기준으로 약 10년전 보다 각각 5.32%, 6.32%, 7.22% 증가하였으며, 전반적으로 불투수면적률이 증가할수록 유출계수는 증가하는 경향을 보였다. 하천 재이용수량은 탄천유역에서 하천수 확보에 긍정적 효과가 나타났지만 안양천유역과 오산천유역은 하천수 확보 효과가 미흡하였다. 그러나 하천 재이용수량으로 인해 각 하천 수질등급이 개선되는 것으로 나타났다.

• 한국물환경학회지
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• 제22권2호
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• pp.349-357
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• 2006

Nowadays, the discharges of urban streams during dry season are depleted because the hydrologic cycle in the watershed has been destroyed due to the expansion of the impermeable area, the excessive groundwater pumping, climate change, and so forth. The streamflow depletion may bring out severe water quality problems. This research are to investigate the hydrologic characteristics and to develop a technology to restore sound hydrologic cycle of Anyangcheon watershed. For the hydrological cycle analysis of the Anyangcheon watershed, continuous simulations of urban runoff were performed for the upstream basin of Gocheok bridge whose basin area covered 4/5 of the whole catchment area. The increase of impervious area by urbanization was analysed and its effect on urban runoff was evaluated. The SWMM 5 (Storm Water Management Model 5) was used for the continuous simulation of urban runoff. The analysis results of urbanization effect on runoff are as follows: the surface runoff in 2000 increases to 65% of the whole precipitation whereas the surface runoff in 1975 amounts to 50% of the precipitation; the groundwater runoff in 2000 amounts to 7% and shows 6% decrease during the period from 1975 to 2000.

• 한국수자원학회논문집
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• 제37권7호
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• pp.599-612
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• 2004

유역규모의 장기 유출모형인 SWAT은 다양한 토지이용을 고려할 수 있는 장점이 있는 반면, 도시지역에 대한 배수특성을 충분히 고려할 수 없는 단점을 가지고 있다. 반면, 세계적으로 도시지역의 유출현상 규명에 널리 이용되는 SWMM 모형은 도시지역의 지표면 특성과 배수특성을 모두 고려할 수 있는 장점이 있는 반면 유역 내 도시지역 이외의 토지이용에 대한 고려가 힘들다는 단절이 있다. 본 연구에서는 두 모형의 장점을 살리고, 단점을 보완한 SWAT-SWMM 결합모형을 경안천내 오산천 유역에 적용하였다. 이로부터 SWAT-SWMM 결합모형에 대한 모식결과와 SWAT 모형에 의한 모의결과를 증발산, 지표면유출량, 토양으로부터의 유출량, 유역 및 하도 유출량 등 수문성분별로 비교ㆍ평가하였고, 두 모형의 수문성분별 유출모식의 특징에 대하여 논의하였다