Bivariate Drought Frequency Analysis to Evaluate Water Supply Capacity of Multi-Purpose Dams

유지수,; 신지예,; 권민성,; 김태웅,

doi:10.12652/ksce.2017.37.1.0231

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…There are many ways to determine the threshold level. Because the characteristics of drought vary according to threshold level, an appropriate threshold level should be chosen [12]. In this study, the threshold level was determined as percentiles of precipitation based on the empirical cumulative distribution function (ECDF).…”

Section: Threshold Level Methodsmentioning

confidence: 99%

“…A threshold level method is another frequently applied tool for defining a drought event and has practical advantages-(i) no a-priori knowledge of probability distributions is required and (ii) it simply and directly produces drought characteristics such as duration and severity [9,10]. Mirakbari et al [11] and Yu et al [12] defined drought events using a certain threshold level of hydro-meteorological variables and analyzed the probabilistic return period through hydrological drought frequency analysis.…”

Section: Introductionmentioning

confidence: 99%

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Hydrologic Risk Assessment of Future Extreme Drought in South Korea Using Bivariate Frequency Analysis

Kim

Yoo

Chung

et al. 2019

Water

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Recently, climate change has increased the frequency of extreme weather events. In South Korea, extreme droughts are frequent and cause serious damage. To identify the risk of extreme drought, we need to calculate the hydrologic risk using probabilistic analysis methods. In particular, future hydrologic risk of extreme drought should be compared to that of the control period. Therefore, this study quantitatively assessed the future hydrologic risk of extreme drought in South Korea according to climate change scenarios based on the representative concentration pathway (RCP) 8.5. A threshold level method was applied to observation-based rainfall data and climate change scenario-based future rainfall data to identify drought events and extract drought characteristics. A bivariate frequency analysis was then performed to estimate the return period considering both duration and severity. The estimated return periods were used to calculate and compare hydrologic risks between the control period and the future. Results indicate that the average duration of drought events for the future was similar with that for the control period, however, the average severity increased in most future scenarios. In addition, there was decreased risk of maximum drought events in the Yeongsan River basin in the future, while there was increased risk in the Nakdong River basin. The median of risk of extreme drought in the future was calculated to be larger than that of the maximum drought in the control period.

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Section: Threshold Level Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrologic Risk Assessment of Future Extreme Drought in South Korea Using Bivariate Frequency Analysis

Kim

Yoo

Chung

et al. 2019

Water

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“…이수안전도는 우리나라에서 ≷수자원장기종합계획(2006 ∼2020)≸ (MOCT, 2006)에서 처음 도입되었고 ≷댐설계기준≸ (MLTM, 2011) 등에서 용수공급시설의 규모 설정 및 운영 기준 수립 등을 위한 기준으로 적용되고 있다. 우리나라의 용수공급능력 평가 지표는 주로 보장공급량과 신뢰도 방식으 로 사용되며 각각 갈수 발생빈도와 물 부족 발생빈도를 기준으 로 하는 지표이다 (Kim and Yu, 2016;Yu et al, 2017). 우리나라 는 치수와 관련된 수자원시설의 운영 및 설계 기준은 명확하 게 제시되어 있는 반면, 이수에 대한 안전도 평가는 표준화된 방법이 명확하게 정립되지 않아 (Yu et al, 2017) 저수지 설계시 사용된 자료기간과 평가기준이 다르다.…”

Section: 서 론unclassified

Evaluation of Irrigation Safety by Operation Management of Water Supply from Large Scale Agricultural Reservoirs

정¹,

범²,

성³

et al. 2021

J. Korean Soc. Hazard Mitig

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Due to recent climate change, droughts occur frequently, thereby causing a shortage of agricultural water. However, supplies to most agricultural reservoirs have been designed assuming that droughts occur at a frequency of 10 years. Therefore, continuous drought has led to low storage rates. Thus, in this study, a water balance analysis was performed on the Naju reservoir, and the changes in the water shortage according to the minimum storage rate restriction management to cope with drought were evaluated. As a result, a higher management storage rate level results in a higher initial storage rate in the next year, thereby decreasing the annual average shortage. In addition, it shows that a decrease in the frequency of drought and its intensity can be reduced according to the minimum storage management during wet years.

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“…For multipurpose dams, effective dam operation is essential to overcome the water supply conditions caused by changes in climate as well as the uncertainties of future water management. Many studies have assessed the performances of the water resource systems of multipurpose dams, and most have applied decision-making methods to establish water supply plans [4] or assessed the water supply capacities and reliability of multipurpose dams using operation methods [5][6][7][8][9][10][11][12] or assessment indices [13][14][15][16] for multipurpose dams. No et al [17], Choi [18], and Nam et al [19] assessed the water supply capacity of a prospective multipurpose dam using future climate change scenarios.…”

Section: Introductionmentioning

confidence: 99%

Improving Reservoir Operation Criteria to Stabilize Water Supplies in a Multipurpose Dam: Focused on Nakdong River Basin in Korea

Kim

Park

Jang

et al. 2018

Water

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Recently, torrential rain and drought have occurred in close temporal proximity and for similar durations due to changes in the spatiotemporal patterns of rainfall owing to climate change. In particular, when a drought occurs, it tends to be prolonged, making it necessary to improve the operation of multipurpose dams that not only control flooding but also serve as water supplies. In this study, standard water volume lines and action plans by response stage were improved so that water could be stored in advance of a drought instead of reservoir operation criteria set based on data from the past. The minimum water demand by use (domestic water, industrial water, and agricultural water) was also calculated. The improved reservoir operation criteria were applied to multipurpose dams in the Nakdong River Basin, and their effects were analyzed by calculating additionally secured water volumes. In the future, in case of lowered water volumes in multipurpose dams owing to a drought, the application of these improved reservoir operation criteria is expected to contribute to water supply stability by delaying entry into the drought stage and minimizing the damages caused by limited water supplies.

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Bivariate Drought Frequency Analysis to Evaluate Water Supply Capacity of Multi-Purpose Dams

Cited by 11 publications

References 11 publications

Hydrologic Risk Assessment of Future Extreme Drought in South Korea Using Bivariate Frequency Analysis

Hydrologic Risk Assessment of Future Extreme Drought in South Korea Using Bivariate Frequency Analysis

Evaluation of Irrigation Safety by Operation Management of Water Supply from Large Scale Agricultural Reservoirs

Improving Reservoir Operation Criteria to Stabilize Water Supplies in a Multipurpose Dam: Focused on Nakdong River Basin in Korea

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