Empirical recommendation for planning the observation density of water level in a reservoir (Case study on Hwacheon Dam in Korea)

Jong Gu Hwang-Bo; Jun Hyuk Hong

doi:10.3741/JKWRA.2022.55.10.835

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2022 Vol.55, Issue 10 Preview Page Next Page

Technical Note

Empirical recommendation for planning the observation density of water level in a reservoir (Case study on Hwacheon Dam in Korea) 저수지 수위 관측밀도 제안: 화천댐 중심으로

31 October 2022. pp. 835-841

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Abstract

The water level of the dam reservoir is an important data in the operation of the dam. reservoir storage can be calculated by using water levels or prepared for disasters such as drought and floods. However, the water level is measured near the dam, making it difficult to represent a reservoir with a large area, and there is a high possibility that the water surface will be distorted due to discharge. Furthermore, the results of the survey showed that the water level of the reservoir is irregular rather than constant, and the water level of the reservoir is repeatedly falling and rising by section. In order to calculate such a complex and irregular representative water level, the water level observation density of the reservoir must be increased. In this study, we tried to derive the optimum water level observation density for Hwacheon Dam. A reasonable water level measurement density was derived by investigating the water level elevation of the reservoir and statistically analyzing it. The observation density may vary depending on the size of the reservoir, so the same analysis was conducted on the Goesan Dam and Boseonggang Dam. According to the results, four Hwacheon dams, three Goesan dams, and seven Boseong River dams are needed for observation density.

Keywords

Reservoir water level

Observation density

Water surface

Hwacheon dam

댐 저수지 수위는 댐 운영에 있어서 핵심적인 수문자료라고 할 수 있다. 댐 저수위를 이용하여 저수량을 산정하기도 하고 가뭄 및 홍수 등 재해에 대비하기도 한다. 그러나 저수위는 댐 부근에서만 계측되어 넓은 면적을 가지는 저수지를 대표하기 어렵고 댐 부근은 방류 등의 영향으로 수면이 왜곡될 가능성이 높다. 또한 조사 결과 저수지 수면은 일정하지 않고 불규칙하며 구간별로 하강과 상승을 반복하는 것으로 나타났다. 이렇게 복잡하고 불규칙한 지수지의 대표 저수위 산정을 위해서 저수지 수위 관측밀도를 높여야 하며 본 연구에서는 화천댐에 대하여 최적의 수위 관측밀도를 도출하고자 하였다. 종방향으로 조사된 저수지 수면 표고를 통계분석하여 저수위 계측 적정 개소수를 도출하였다. 저수지 규모 별로 관측 밀도가 다르게 나타날 수 있어 괴산댐과 보성강댐에 대해서 같은 분석을 실시하였다. 그 결과 화천댐은 4개소, 괴산댐은 3개소, 보성강댐은 7개소의 관측밀도가 필요한 것으로 분석되었다.

키워드

저수위

관측밀도

수면형

화천댐

References

HwangBo, J.-G., Oh, S.H., Hong, J.H., Kang, J.S., and Park, D.W. (2022). "Reservoir water surface slope measurement." Proceedings of the Korea Water Resources Association Conference, pp. 1-41.

Kang, S., Kang, T., and Lee, S. (2014). "Application of the SCE-UA to derive zone boundaries of a zone based operation rule for a dam." Journal of Korea Water Resources Association, Korea Water Resources Assocication, Vol. 47, No. 10, pp. 921-934. 10.3741/JKWRA.2014.47.10.921

Kim, N. (1996). Actual conditions and improvement measures for dam operations during the drought and flood periods - Soyang River Multi-Purpose Dam in the Han River basin -. KICT 96-109. Research Report. Korea Institute of Civil Engineering and Building Technology, pp. 43-44.

Kim, Y.-O. (1998). "Sensitivity analysis for opertating a reservoir system to hydrologic forecast accuracy." Journal of Korea Water Resources Association, KWRA, Vol. 31, No. 6, pp. 855-862.

Song, J.-H., Her, Y., and Kang, M.-S. (2022). "Estimating reservoir inflow and outflow from water level observations using expert knowledge: Dealing with an ill-posed water balance equation in reservoir management." Water Resources Research, Vol. 58, No. 4, e2020WR028183. doi: 10.1029/2020WR028183. 10.1029/2020WR028183

Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 55
No :10
Pages :835-841
Received Date : 2022-09-01
Revised Date : 2022-09-20
Accepted Date : 2022-09-24
DOI :https://doi.org/10.3741/JKWRA.2022.55.10.835

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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