• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2007년도 학술발표회 논문집
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• pp.1798-1802
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• 2007

The practice of business estimate flood discharge by rainfall-flow relation that is easy collection of observation data. The important factor is rainfall, coefficient of runoff, and drainage area for analysis of runoff-flow relation.The practice of business usually use probability rainfall that use a weighted average value after each observation post estimate probability of non-same time. It has more error than same time probability rainfall, and it can excess of estimation because it can't consider space distribution of rainfall.The study of result showed similar aspect with existing ARF but width of coefficient become smaller. And the comparison of peak flow did not different what used by ARF and same time probability rainfall(A group). But non-same time probability rainfall is bigger 25% more than another(B group). Between A group and B group of the difference increased with the lapse of time.

• 산업기술연구
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• 제27권A호
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• pp.95-102
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• 2007

The practice of business estimate flood discharge by rainfall-flow relation that is easy collection of observation data. The important factor is rainfall, coefficient of runoff, and drainage area for analysis of runoff-flow relation. The practice of business usually use probability rainfall that use a weighted average value after each observation post estimate probability of non-same time. It has more error than same time probability rainfall, and it can excess of estimation because it can't consider space distribution of rainfall. The study of result showed similar aspect with existing ARF but width of coefficient become smaller. And the comparison of peak flow did not different what used by ARF and same time probability rainfall(A group). But non-same time probability rainfall is bigger 25% more than another(B group). Between A group and B group of the difference increased with the lapse of time.

• 한국수자원학회논문집
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• 제50권6호
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• pp.359-371
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• 2017

본 연구에서는 안동댐유역을 대상으로 분포형 모형과 미계측유역 자료생성방법인 공간확장자료 생성방법을 사용하여 47개 미계측유역에 대해 홍수유출 시계열자료를 생성하고 3개 관측유역을 포함한 총 50개 유역에 대해 첨두유량을 추출하여 분석함으로써 강우의 공간분포가 유출에 미치는 영향을 실제유역과 실제사상에 대해 자세히 분석하였다. 20개 사상에 대해 GRM 모형의 매개변수 보정 및 검증결과 적절한 모형효율 통계결과를 얻었다. 이 추정된 매개변수와 실제강우(강우의 공간분포를 고려한 강우) 및 공간평균강우(실제강우를 공간적으로 평균한 강우)를 사용하여 50개 유역의 홍수유출 시계열자료를 생성하였으며 이 시계열 자료 중 첨두유량을 추출하여 분석한 결과 공간평균강우에 의한 첨두유량의 분포는 실제강우에 의한 첨두유량의 분포와 차이가 있었다. 강우의 분포가 유역전반에 비슷한 경우에는 실제강우와 공간평균강우에 의한 첨두유량의 분포가 비슷하거나 약간의 차이가 있었다. 하지만 호우가 상류 또는 하류방향으로 이동하거나 강우가 무작위로 분포되는 경우에는 공간평균강우에 의한 첨두유량의 분포가 실제강우에 의한 첨두유량의 분포보다 크게 좁아지는 것을 보였다. 이러한 사상의 비율을 조사한 결과 강우의 공간적 변동성을 고려하지 않고 홍수유출을 모의한다면 약 35%의 사상에 대해서는 적절하지 않은 첨두유량 모의결과를 얻을 수 있는 것으로 조사되었다. 따라서 홍수량 산정 또는 수자원 설계 시 강우의 시간분포 뿐만 아니라 공간분포 또한 고려해야 한다. 계측유역과 미계측유역의 첨두유량의 관계를 조사한 결과 낙동강 지류들에 위치한 미계측유역들의 첨두유량들은 그 크기가 넓게 분포됨에 따라 계측유역의 첨두유량을 사용하여 생성한 power law 관계를 이 미계측유역들의 첨두유량 추정 시 사용할 수 없었다. 또한 계측유역들의 첨두유량 또는 미계측유역 중 상하류로 연결된 비독립적인 소유역들의 첨두유량간에는 power law 가 존재하였으나 낙동강 지류들에 위치한 독립된 소유역들의 첨두유량들 간에는 상관관계가 없었다.

• 한국환경과학회지
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• 제7권4호
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• pp.451-460
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• 1998

The objectives of this study Is to evaluate the total runoff yield, peak flow and peak flow travel time depending on the urbanization, return period and rainfall patterns at the downstream of Manchon urban watershed in TaeGu City. SWM(Storm Water Management Model) is used for runog analysis based on 5 different steps of urbanization and 4 different types of Hufrs quartile according to 8 return periods. It is analyzed that the order of total runoff yield according to raiun patterns is Huffs 4, Huffs 2. Huffs 3 and Huffs 1 quartile, that of peak flow magnitude is Huffs 2, Huffs 1, Huffs 4 and Huffs 3 quartile at present development ratio. under the 60, 70, 80 and 90ft of urbanization to the 50% of urbanization by means of the rainfall patterns, the mean Increasing ratio of total runoff yield for each case is 4.55, 11.43, 16.07 and 20.02%, that of peak flow is 5.82, 13.61, 17.15 and 18.83%, the mean decreasing ratio of peak flow travel time Is 0.00, 2.44, 5.07 and 6.26%, the mean increasing ratio of runoff depth Is 4.51, 11.42, 16.02 and 20.05% respectively. the mean increasing ratio of total runoff yield by means of each and 19.71%. Therefore, as the result of this study. it can be used for principal data as to storm sewage treatment and flood damage protection planning in urban small watershed.

• 한국수자원학회논문집
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• 제44권1호
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• pp.41-49
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• 2011

본 연구는 한 유역 내에서 단위유량도의 첨두치가 강우 강도에 따라 변동되는 기존 연구 분석 사례를 근간으로 하여 고찰된다. 시간불변이라는 이론적 기본 가정과 달리 호우별 강우강도에 따라 시변(時變)하는 단위유량도를 설정하고 강우사상에 적용하여 유출수문곡선을 산출하여 검토한다. 이 때 적용되는 단위유량도의 경우 첨두유량과 첨두발생시간은 기왕 연구된 강우강도와의 관계식을 검토하여 이용하고 단위유량도 형상은 산출된 첨두치를 적용한 Nash의 단위유량도로 설정된다. 비교 목적을 위해서 적용하는 유역 평균 단위유량도는 강우사상별로 유도된 26개의 단위유량도의 평균 첨두치에 의한 Nash의 모형이다. 호우사상의 강우강도별로 변동되는 단위유량도와 평균단위유량도로부터 산출된 수문곡선의 첨두유량과 첨두발생시간을 관측수문곡선과 비교한다. 비교한 결과 본 연구에서 보완적으로 제시한 시변(時變)의 단위유량도는 평균 단위유량도에 의해서 계산한 첨두홍수량과 첨두발생시간 보다 관측치에 접근함을 보인다.

• 한국환경보건학회지
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• 제31권1호
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• pp.1-6
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• 2005

This study was conducted to identify the runoff characteristics of non-point source according to rainfall in Nam watershed. Land-uses of the Nam watershed were surveyed paddy field 4.5%, crop field 6.8%, mountainous 78.7%, urban 2.4%, and etc. 7.7%. Mean runoff coefficients in each area were observed Ⅰ area 0.08, Ⅱ area 0.08, and Ⅲ area 0.05. In the relationship between the rainfall and peak-flow, correlation coefficients(r) were investigated Ⅰ area -0.8609, Ⅱ area 0.6035, and Ⅲ area -0.4913. In the relationship between the antecedent dry period and first flow runoff, correlation coefficients(r) were investigated Ⅰ area -0.9093, Ⅱ area -0.1039, and Ⅲ area -0.7317. The discharge of pollutant concentrations relates to the flow rate of storm-water. In the relationship between the rainfall and watershed loading, exponent values of BOD, COD, SS, and T-N were estimated to 1.2751, 1.2003, 1.3744, and 1.1262, respectively.

• Korean Journal of Hydrosciences
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• 제3권
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• pp.97-104
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• 1992

To design the minor structures in the small watersheds, it is required to calculate the peak discharge. For these calculations the simple peak flow prediction equations, the unit hydrograph method. the syntheic unit hydrograph methods or the runoff simulation models are adopted. To use these methods it is generally requried to know the amount and the distributions of the design rainfall; which are the uniform distribution, the trangular distribution, the trapezoidal distribution, or the Huff type distribution. In this study, the peak discharges are calculated by the different rainfall distributions and the results are compared.

• 한국농공학회지
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• 제42권3호
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• pp.76-88
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• 2000

AGNPS model is applied in this study to analyze the changes of non-point source pollutant according to AMC condition using probable rainfall. Probable rainfall of H-dam area by Gumber's extreme value distribution is computed through frequency analysis for each return period. 35 coarse grids are subdivided into 134 find grids of finite differential network to analyze peak flow soil loss quantity and nutrients of study area and the modified CN estimation equation shows good result about rainfall events-peak flow relationship. And as the consequence of estimation of soil loss quantity for each rainfall event soil loss quantity shows 120%-170% of actual soil loss quantity Regression analysis for the observed and calculated values of flow T-P AMC has an important effect on nutrients concentration of outflow and it if found that the excessive fertilization under AMC III condition may cause eutrophication by nutrients because the range of increase of outflow concentration appears relatively high.

• Water Engineering Research
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• 제5권2호
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• pp.81-99
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• 2004

Long term streamflow regime under virtual climate change scenario was examined. Rainfall forecast simulation of the Canadian Global Coupled Model (CGCM2) of the Canadian Climate Center for modeling and analysis for the IPCC SRES B2 scenario was used for analysis. The B2 scenario envisions slower population growth (10.4 billion by 2010) with a more rapidly evolving economy and more emphasis on environmental protection. The relatively large scale of GCM hinders the accurate computation of the important streamflow characteristics such as the peak flow rate and lag time, etc. The GCM rainfall with more than 100km scale was downscaled to 2km-scale using the space-time stochastic random cascade model. The HEC-HMS was used for distributed hydrologic model which can take the grid rainfall as input data. The result illustrates that the annual variation of the total runoff and the peak flow can be much greater than rainfall variation, which means actual impact of rainfall variation for the available water resources can be much greater than the extent of the rainfall variation.

• 한국환경과학회지
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• 제9권3호
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• pp.193-199
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• 2000

This study is carried out the analysis of the runoff characteristics for the design of the interior drainage systems by SWMM in urbanization basin. The basin analyzed in this study is Bumuh-chun basin which is located in Susung-gu of Taegu city. Huff method is used for rainfall distribution analysis. The optimal rainfall duration in Bumuh-chun basin is analyzed as about 90 minutes decided from comparison of arrival time and critical duration. Flood flow variation pattern is proposed through the comparison of the results of peak flow and peak time analyzed by SWMM about pre-urbanization and post-urbanization of Bumuh-chun basin. It is known that the variation of arrival time caused by the rapid increase of pavement rate in the upper area shows about 20∼25 minutes faster than pre- urbanization. Therefore, the management of surface water for design of water supply and drainage, and channel alteration has to considered the variation of geological factors according to urbanization.