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http://dx.doi.org/10.3741/JKWRA.2020.53.1.71

Evaluation of instream flow in Han river according to the Imnam dam operation in North Korea  

Lee, Jae-Kyoung (Innovation Center for Engineering Education, Daejin University)
Jang, Suk Hwan (Department of Civil Engineering, Daejin University)
Ihm, Nam-Jae (Department of Civil Engineering, Daejin University)
Publication Information
Journal of Korea Water Resources Association / v.53, no.1, 2020 , pp. 71-82 More about this Journal
Abstract
The objective of this study is to evaluate the instream flow in the North Han River basin according to the operation of Imnam Dam in North Korea. The water budget and instream flow satisfaction were analyzed using hourly, daily and monthly data of Water Management Information System (WAMIS) from Jan. 1991 to Dec. 2018. As a analysis result of water budget using hourly data in the North Han River basin, although inflows compared with dam release in the upstream basin of Peace Dam-Hwacheon Dam and Chuncheon Dam-Soyanggang Dam-Uiam Dam were calculated as negative values, the reasonable results using daily and monthly average data were estimated. It showed that the results of water budget analysis of dam inflow and total release may be different by time units of data. The monthly average inflow of Hwacheon Dam decreased significantly after the construction in 2003 of Imnam Dam, which confirmed that the operation of Imnam Dam had a significant effect on the dams in the North Han River basin. The operation of Imnam Dam is one of the main reasons for the lack of instream flow and total shortage amounts and shortage period increased up to +330% due to the decrease in inflow and total release of dams in the North Han River water after the operation of Imnam Dam. It is necessary to study various plans to secure instream flow including transboundary river management
Keywords
Instream flow; Shared river; North Han River; Imnam Dam;
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