A Tank Model Application to Soyanggang Dam and Chungju Dam with Snow Accumulation and Snow Melt

Lee, Sang-Ho; An, Tae-Jin; Yun, Byung-Man; Shim, Myung-Pil

doi:10.3741/jkwra.2003.36.5.851

Cited by 6 publications

(3 citation statements)

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“…Some studies paid attention to certain hydrological reservoirs to improve model simulation. Bae and Oh (1998) and Lee et al (2003), for example, considered snowmelt in order to improve runoff estimations in mountain watersheds. Lee et al (2001) and Kim and Won (2004), however, focused on ground water simulation in order to improve runoff simulation for dry periods.…”

Section: Introductionmentioning

confidence: 99%

Long‐term trend of precipitation and runoff in Korean river basins

Bae

Jung

Chang

2008

Hydrological Processes

137

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Abstract:The spatial and temporal variations of precipitation and runoff for 139 basins in South Korea were investigated for 34 years . The Precipitation-Runoff Modelling System (PRMS) was selected for the assessment of basin hydrologic response to varying climates and physiology. A non-parametric Mann-Kendall's test and regression analysis are used to detect trends in annual, seasonal, and monthly precipitation and runoff, while Moran's I is adapted to determine the degree of spatial dependence in runoff trend among the basins. The results indicated that the long-term trends in annual precipitation and runoff were increased in northern regions and decreased in south-western regions of the study area during the study period. The non-parametric Mann-Kendall test showed that spring streamflow was decreasing, while summer streamflow was increasing. April precipitation decreased between 15% and 74% for basins located in south-western part of the Korean peninsula. June precipitation increased between 18% and 180% for the majority of the basins. Trends in seasonal and monthly streamflow show similar patterns compared to trends in precipitation. Decreases in spring runoff are associated with decreases in spring precipitation which, accompanied by rising temperatures, are responsible for reducing soil moisture. The regional patterns of precipitation and runoff changes show a strong to moderate positive spatial autocorrelation, suggesting that there is a high potential for severe spring drought and summer flooding in some parts of Korea if these trends continue in the future.

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Section: Introductionmentioning

confidence: 99%

Long‐term trend of precipitation and runoff in Korean river basins

Bae

Jung

Chang

2008

Hydrological Processes

137

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“…국내에서 개념적 강우-유출모형을 이용하여 저수지 유입량을 예측한 연구들 중에는 Tank 모형을 이용 하여 저수지 유입량을 모의하고 저수지 거동을 분석한 연 구들이 대부분이다 (Kim and Park, 1988;Huh et al, 1993a and1993b;Kim and Park, 1994). 또한 모형의 매개변수 를 저수지 실측 저수량과 모의치의 오차를 최소화하는 방 향으로 최적화하여 저수지 유입량을 추정한 연구들도 수 행된 바가 있다 (Noh, 2000;Kang, 2004 (Sugawara, 1972), 국내 중 소유역 유 출해석에 적용되어 비교적 양호한 결과를 제시한 바가 있 다 (Lee et al, 2003). 특히 Kim and Park(1988) 과 Huh et al (1993a) (Lee et al, 2003;Lee and Kang, 2007).…”

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“…또한 모형의 매개변수 를 저수지 실측 저수량과 모의치의 오차를 최소화하는 방 향으로 최적화하여 저수지 유입량을 추정한 연구들도 수 행된 바가 있다 (Noh, 2000;Kang, 2004 (Sugawara, 1972), 국내 중 소유역 유 출해석에 적용되어 비교적 양호한 결과를 제시한 바가 있 다 (Lee et al, 2003). 특히 Kim and Park(1988) 과 Huh et al (1993a) (Lee et al, 2003;Lee and Kang, 2007). 또한 Huh et al (1993a) …”

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Parameter Regionalization of a Tank Model for Simulating Runoffs from Ungauged Watersheds

강민구¹,

Lee²,

박기욱³

2013

Journal of Korea Water Resources Association

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To provide a reliable tool for runoff simulations of ungauged watersheds upstream of reservoirs, a daily runoff simulation model, Tank model, is restructured, the parameter regionalization of the model is conducted, and the model's applicability is evaluated. Taking into account the characteristics of runoffs from the watersheds, a three-tank model is employed. The percolation process of the model's third tank is eliminated, considering the water budgets of the watersheds, and its evapotranspiration component is improved, reflecting the conditions of meteorological observation in South Korea. The sensitivity analysis of the model shows that the model's behaviors, varying with a sensitive parameter, α, are reasonable. The regional parameter estimation equations are determined, using the characteristics and land uses of the watersheds as variables. The model is applied for the runoff simulations of three watersheds and the water stage simulation of one reservoir, and the simulation results are then compared with the observed values, which prove to be in close agreement with the observations. In addition, the results from simulating inflows of twenty-four reservoirs using the model show that the averages of evapotranspiration rate and runoff rate are 42.8% and 56.6%, respectively, which are resonable. Consequently, it is concluded that the model is practically applicable to simulating runoffs from watersheds upstream of reservoirs, and simulated inflow data are useful for watershed management and reservoir planning, design, and operation.

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