• 한국농공학회지
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• 제37권2호
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• pp.13.2-20
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• 1995

An water balance model was formulated to simulate the change in water levels at the estuary reservoir from sluice gate releases and the inflow hydrographs, and an one-di- mensional flood routing model was formulated to simulate temporal and spatial varia- tions of flood hydrographs along the estuarine river. Flow rates through sluice gates were calibrated with data from the estuary dam, and the results were used for a water balance model, which did a good job in predicting the water level fluctuations. The flood routing model which used the results from two hydrologic models and the water balance model simulated hydrographs that were in close agreement with the observed data. The flood forecasting model was found to be applicable to real-time forecasting of water level fluc- tuations with reasonable accuracies.

• 한국농공학회지
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• 제45권6호
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• pp.109-118
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• 2003

As a fundamental research to establish a safety operation plan for irrigation dams, this study presents hydrologic analysis conducted in Sungju Dam watershed based on various rainfall data. Especially those reservoirs without flood control feature are widely exposed to the risk of flooding, a safe and optimized operation program need to be improved against arbitrary flooding. In this study, reservoir routing program was developed and simulated for reservoir runoff estimation using WMS hydrology model. The model simulated the variations of reservoir elevation under the condition of open or closed emergency gate. In case of closed emergency gate, water surface elevation was given as 193.15 m, and this value exceeds the dam crest height by 1.65 m. When the emergency gate is open, the increment of water surface elevation is given as 192.01 m, and this value exceeds dam crest height by 0.57 m. As an alternative plan, dam height increase can be considered for flood control under the PMP (Probable Maximum Precipitation) condition. Since the dam size is relatively small compare to the watershed area, sound protection can be expected from the latter option rather than emergency gate installation.

• 한국관개배수논문집
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• 제17권2호
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• pp.57-70
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• 2010

This study was performed to analyze the affect of water supply capacity followed by allocating flood control volume in heightening reservoir, of which Baekgog reservoir was selected as a case study in here. Baekgog reservoir is located in Jincheon county, Chungbuk province, of which full water level will be heightened from EL. 100. 1m to EL. 102.1m, and total storage from 21.75M $m^3$ to 26.67M $m^3$. Flood inflow with 200year frequency was estimated to 997 $m^3$/s in peak flow and 22.54M $m^3$ in total volume. Reservoir flood routing was conducted to determine flood limited water levels, which was determined to have scenarios such as EL 97-98-99m in periods of 6.21.-7.20., 7.21.-8.20., and 8.21.-9.20., respectively, EL 97-97-97m, EL 98-98-98m in present reservoir, and EL 99-100-101m, EL 99-99-99m, and EL 100-100-100m in heightened reservoir. Reservoir inflow was simulated by DAWAST model. Annual paddy irrigation requirement was estimated to 33.19M $m^3$ to 2,975ha. Instream flow was allocated to 0.14mm/d from October to April. Operation rule curve was drawn using inflow, irrigation and instream flow requirements data. In case of withdrawal limit reservoir operation using operation rule curve, reduction rates of annual irrigation supply before and after flood control by reservoir were 2.0~4.3% in present size and 1.5~3.6% in heightened size. Reliability on water supply was decreased from 77.3% to 63.6~68.2% in present size and from 81.6% to 72.7~79.5% in heightened size. And reduction rates of water storage at the end of year before and after flood control by reservoir were 7.3~16.5% in present size and 7.7~16.9% in heightened size. But water supplies were done without any water deficiency through withdrawal limit reservoir operation in spite of low flood regulating water level.

• 한국수자원학회논문집
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• 제35권6호
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• pp.787-796
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• 2002

자연하천의 부정류 홍수예측을 위하여 Preissmann기법에 의한 수리학적 홍수추적을 실시하였으며, 민감도 분석을 위한 상류단과 측방유입수문곡선으로서 Log-Pearson Type-III를 사용하였다. 실제하천 적용에 있어서 유역에 대해서는 선형저수지 모형을 적용하고 하도망에 대해서는 수리학적 홍수추적을 실시하였다. 상류단과 측방유입수문곡선은 선형저수지 모형을 이용하여 산정하였으며, 하류단 경계조건으로서 Manning공식을 이용하였다. 유입수문곡선으로서 선형저수지모형이 적용된 부정류모형을 보청천유역에 적용시킨 결과 실측치와 매우 근접한 수문곡선을 예측할 수 있었으며, 본 연구는 측방유입이 있는 경우, 선형저수지 모형을 이용한 수리학적 홍수예측이 가능하고, 부정류모형을 이용하여 흐름계산을 할 경우 조도계수 산정을 위한 수단이 될 수 있을 것으로 판단된다.

• 한국수자원학회논문집
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• 제31권6호
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• pp.727-739
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• 1998

일반적으로 저수지 최적운영의 목적은 한정된 수자원을 여러 목적으로 최적 분배하여 얻는 이익의 최대화와, 홍수 발생으로 인한 과잉 수량을 안전하게 배제시킴으로써 홍수 취약지역의 피해를 최소화시키는 것으로 구분할 수 있다. 저수지 운영에 대한 연구사를 고찰해 볼 때, 지난 수십 년간 첫 번째 영역에 연구가 집중되었음을 알 수 있다. 본 연구의 목적은, 충주 저수지의 홍수조절을 위한 저수지 최적운영의 방법론 개발에 중점을 두고, 하류 홍수피해 최소화와 댐 안전도 및 상류 홍수피해 최소화의 상충되는 목적들이 타협되는 최적 운영정책 수립을 위한 최적화 모형의 개발에 있다. 본 목적 달성을 위해 (1)HYMOS를 이용한 수문자료 검증, (2)강우-유출 호명과 SOBEK 1차원 부정류 홍수추적 모형의 간접결합을 통한 하류 홍수피해 평가 모형의 구성, (3)인공신경망 기법을 이용한 하유 홍수피해 평가 모형의 복제, (4)저수지 최적화모형 개발의 순차적 절차로 연구가 수행되었다.

• 한국수자원학회논문집
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• 제40권1호
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• pp.1-10
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• 2007

더 많은 수자원을 확보하기 위한 하나의 대안으로서 다목적 저수지의 홍수조절공간과 이수공간 사이에서 용량 재할당 방안을 제안하였다. 저수용량 재할당이란 기존의 저수지에 물리적 변화 없이 좀 더 많은 편익을 얻을 수 있도록 상시만수위를 조정하는 관리 기법이다. 본 연구의 목적은 홍수조절에 미치는 악영향을 최소화하면서 용수공급에 필요한 용량을 증대시킬 수 있는 저수지 용량 재할당 방법론을 개발하는 것이다. 이 방법은 다양한 빈도별 유입홍수량에 대한 홍수기 저수지 모의운영, 중요지점까지 홍수추적, 하천최대허용유량 검토, 재할당 수위에 대한 저수지 공급능력 검토 등으로 구성되어 있다. 홍수조절을 위한 저수지 모의운영 모형으로는 Rigid ROM과 HEC-5를 사용하였다. 본 연구에서 제안된 방법을 금강 유역에 적용하였다. 특히 상류의 저수지가 존재할 때와 존재하지 않을 때를 고려하여 서로 경합하는 목적들 사이의 절충을 분석하였다.

• 한국농공학회지
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• 제18권1호
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• pp.4079-4086
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• 1976

In many reservoir projects, economic considerations will necessitate a design utilizing surcharge. Determination of the most economical combination of surcharge and spillway capacity for a given spillway crest level will require flood routing studies and economic studies of the dam-reservoir-spillway combinations. Many methods of actual flood routing have been devised, each of them with its advantages and disadvantages. Some of these methods are listed below: (1) Arithmetical trial-and-error method. (2) Modified Puls' method (3) Cheng's graphical method (4) Horton's arithmetical method (5) Ekadahl's arithmetical method (6) Digital computer programming. For the purpose of preliminary design and cost estimating of dams and spillways, it is often required to estimate, for a given design flood and spillway crest level. the approximate values of two among the three characteristics of the spillway spillway length, maximum discharge and surcharge depth at maximum discharge, when one of these quantities is given. As is well known, the outflow hydrograph for an ungated overflow spillway assumes the form of a wave-shaped curve with a minimum point for Q=o At zero time and a maximum point for Q=Qmax at its intersection with the falling leg of the inflow hydrograph (see Fig. 4) The shaded area between the inflow and outflow hydrographs represents at the approximate scale the temporary retention Vt. In line with the remarks, draw by free hand the assumed outflow hydrograph with its maximum point for the given Qmax (see Fig. 4) and by planimetration find Vt. From the reservoir capacity curve (Fig. 3) find Vs for the given spillway crest level and make V=Vs+Vt. From the above curve find surcharge water elevation for V and surcharge depth Hmax over spillway crest. From the discharge formula compute {{{{L= { Q} over { { CH}^{3/2 } } }}}} The methed provides a means for a quick and fairly accurate estimation of spillway capacity.

• 대한토목학회논문집
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• 제32권2B호
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• pp.93-101
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• 2012

댐 운영에 의한 합리적인 용수공급과 홍수조절을 위하여 HEC-ResSim 모형을 섬진강 댐에 적용하였다. 섬진강 댐과 인근 하류 지역의 홍수피해를 최소화하기 위해 다양한 빈도별로 유입되는 홍수사상에 대하여 홍수기 운영룰을 적용하여 저수지추적을 수행하였고 하류 지역의 수문학적 거동특성을 검토하였다. 홍수기 예비방류에 따른 빈도별 저수지 홍수추적을 수행하여 상시만수위 운영에 따른 댐의 안정성을 검토하였고 가변제한 상시만수위를 이용한 댐 운영시 댐의 용수공급능력 변화와 댐하류단의 유황분석을 통해 수문학적 거동 특성을 검토하여 댐의 운영 수위 설정을 위한 합리적인 평가방법을 제시하였다.

• 한국환경과학회지
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• 제2권3호
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• pp.193-199
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• 1993

This study has two objectives. One is developing the runoff model for Hoe-Dong Reservoir basin located at the upstream of Su-Young River in Pusan. To develop the runoff model, basic hydrological parameters - curve number to find effective rainfall, and storage coefficient, etc. - should be estimated. In this study, the effective rainfall was calculated by the SCS method, and the storage coefficient used in the Clark watershed routing was cited from the report of P.E.B. The other is the derivation of transfer function for Hoe-Dong Reservoir basin. The linear, discrete, input-output model which contained six parameters was selected, and the parameters were estimated by the least square method and the correlation function method, respectively. Throughout this study, rainfall and flood discharge data were based on the field observation in 1981.8.22 - 8.23 (typhoon Gladys). It was observed that the Clark watershed routing regenerated the flood hydrograph of typhoon Gladys very well, and this fact showed that the estimated hydrological parameters were relatively correct. Also, the calculated hydrograph by the linear, discrete, input-output model showed good agreement with the regenerated hydrograph at Hoe-Dong Dam site, so this model can be applicable to other small urban areas. Key Words : runoff, effective rainfall, SCS method, clark watershed iou상ng, hydrological parameters, parameter estimation, least square method, correlation function method, input-output model, typhoon gladys.

• 한국해안해양공학회지
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• 제17권4호
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• pp.269-279
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• 2005

새만금호의 방조제 완공이후와 내부 개발이후 만경강 및 동진강의 홍수량 유입과 내부 수위를 관리하기 위해 수문을 작동할 매 수리특성이 어떻게 반응할 것인가를 평가하기 위한 수치실험이 수심적분된 ADCIRC 모형을 이용하여 실시되었다. 2차원 동적하도추적에 따르면, 상류에서는 홍수수문의 시간적 변화가 민감하나 홍수파가 호 내로 유하 하면서 급확대되는 물리적 특성에 따라 호 중심부터는 안정화된다. 평상시 관리수위를 유지하기 위해 수문을 제어하는 경우, 내부개발이후가 방조제 완공직후에 비해 수문 인근영역에서 유속, 수위 등에 동적응답이 즉각적으로 보다 크게 일어나고, 외해수를 호 내측으로 받아들이면 불규칙 수면교란이 일시적으로 발생하는데 내부개발 전후에 따라 최대 10km 및 16km정도까지 상류방향으로 전파된다.