Re-evaluation of Soyang Dam inflow based on modifying a simple water balance method considering evaporation

Jiyoung Yoo; Dong Jin Lee; Do-Guen Yoo; Tae-Woong Kim

doi:10.3741/JKWRA.2022.55.6.461

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2022 Vol.55, Issue 6 Preview Page Next Page

Re-evaluation of Soyang Dam inflow based on modifying a simple water balance method considering evaporation 증발량을 고려한 단순 물수지 방정식 개선을 통한 소양강댐 유입량의 재평가

30 June 2022. pp. 461-469

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Abstract

It is very important to ensure the reliability of dam inflow data, which is critical in planning and managing the supply and demand of water resources in a basin. However, the simple water balance model sometimes results in negative inflows and does not consider the actual inflow characteristics. In this study, to address these issues, the existing water balance formula was modified by considering evaporation which is available for calculation among other outflows. The modified water balance formula was applied to the Soyang Dam. The results showed that the rate of negative inflows decreased in the re-evaluated dam inflow data and it was possible to secure consistency for the total inflow volume. In addition, investigating the water availability in the Soyang Dam watershed based on the water balance concept considering evaporation, it was found that direct water use in the human aspect was about 60%, and the indirect water use in the natural aspect was about 40%. In drought years, it was also confirmed that the proportion of indirect use of water resources increased.

Keywords

Dam inflow

Water balance

Soyang Dam

Evaporation

유역의 수자원 수급계획 시 중요하게 사용되는 댐 유입량은 자료의 신뢰성을 확보하는 것이 매우 중요하다. 하지만 단순 물수지법에 의해 산정되는 댐 유입량은 음유입량이 다수 발생하고, 댐 방류량 이외의 유출량을 생략함으로써 실제 유입량 특성을 반영하지 못한다. 본 연구에서는 이러한 문제를 해결하기 위하여, 물수지에서의 유출량 중 고려 가능한 증발량을 고려하여 물수지 개선식을 제시하였다. 소양강댐을 대상으로 재평가된 댐유입량 시계열에서 음유입량의 발생비율이 감소하고, 자료 생산주기별 유입량의 체적은 일관성을 확보하였다. 이외에도 소양강댐 유역에서의 가용수자원 특성을 검토한 결과, 인간적 측면에서의 직접적인 사용이 약 60%이고, 자연적 측면에서의 간접적 사용이 약 40%인 것으로 나타났다. 또한 가뭄해에는 전체 수자원의 총량 중 간접적인 수자원 이용의 비중이 증가하는 것이 확인되었다.

키워드

댐 유입량

물수지법

소양강댐

음유입량

증발량

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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 :6
Pages :461-469
Received Date : 2022-03-17
Revised Date : 2022-05-15
Accepted Date : 2022-05-21
DOI :https://doi.org/10.3741/JKWRA.2022.55.6.461

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

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