Browse > Article
http://dx.doi.org/10.3741/JKWRA.2015.48.5.379

Analysis of Long-Term Riverbed-Level and Flood Stage Variation due to Water Gate Operation of Multi-functional Weirs at Geum River  

Jeong, Anchul (Dept. of Civil Engrg., Chungnam National Univ.)
Jung, Kwansue (Dept. of Civil Engrg., Chungnam National Univ.)
Publication Information
Journal of Korea Water Resources Association / v.48, no.5, 2015 , pp. 379-391 More about this Journal
Abstract
Multi-functional weirs has been installed in four rivers are hydraulic structures across the river. The structures were divided into movable and fixed weirs. Hence, riverbed-level variation and sediment transport can be varied due to water gate operation. In this study, the long-term riverbed-level variation of Geum river basin due to water gate operation of multi-functional weirs was studied. Result of this study shows that the variation of thalweg elevation was greater than the variation of annual average riverbed elevation due to multi-functional weirs construction and water gate operation. Maximum riverbed degradation of thalweg elevation that occurred was 2.79m and riverbed aggradation was 1.90m. Maximum riverbed degradation of the annual average riverbed elevation that occurred was 2.16m and riverbed aggradation was 1.24m. Analysis result of flood stage by the variation of riverbed-level shows that flood stages were increased in majorities area. The maximum increase in the value of flood stage was 2.23m. For this reason, flood stages can be greater than the freeboard of the levees. Therefore, we should consider the water gate operation of multi-functional weirs when planning and managing sediment in the river. We are expecting to use the result of this study in river planning for river management and selecting the river regime.
Keywords
Multi-functional weir; Water gate operation; Riverbed-level variation;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 Ahn, J.M., and Lyu, S. (2013). "Analysis of flow and bed change on hydraulic structure using CCHE2D:focusing on Changnyong-Haman." Journal of KWRA, KWRA, Vol. 46, No. 7, pp. 707-717.
2 Choi, M., Lee, S.O., Ahn, J.H., and Yoon, Y.N. (2008). "An analysis of long-term river bed changes using surface-water modeling system(SMS) model: a case study of Pochon stream basin." Journal of KOSHAM, KOSHAM, Vol. 8, No. 2, pp. 139-147.
3 Chung, S.Y., Park, B.J., and Jung, K.S. (2006). "A study on the applicability of GSTAR-1D to the riverbedlevel variation in the Geum river." Proceedings of the KWRA Conference, pp. 1611-1615.
4 Jang, C.L., and Woo, H. (2009). "Analysis of bed material changes by flushing flow from Daecheong dam." Journal of KWRA, KWRA, Vol. 42, No. 10, pp. 845-855.
5 Ji, U., Son, K.I., and Kim, M. (2009). "Numerical analysis for bed changes in the upstream channel due to installation of sediment release openings in the flood control dam." Journal of KWRA, KWRA, Vol. 42, No. 4, pp. 319-329.
6 K-water. (2012). Dam operational practices handbook.
7 KWRA(Korea Water Resources Association) (2009). Standard and commentary of river design.
8 MLTMA(Ministry of Land, Transport and Maritime Affairs) (2009). Geumriver basin master plan (Changed).
9 MLTMA(Ministry of Land, Transport and Maritime Affairs) (2010). Annual hydrological report on Korea.
10 MOCT(Ministry of Construction and Transportation) (2006). Survey report of Geum river basin.
11 NIER (National Institute of Environmental Research) (2010). The prediction of riverbed change, sediments and dredging period after building gydraulic structures in the Geum river, 2010-91-1266.
12 Shen, H.W. (2010). "Flushing sediment through reservoirs." Journal of Hydraulic Research, IAHR, Vol. 37, No. 6, pp. 743-757.   DOI
13 Son, A., Han, K., and Kwon, T. (2013). "The study of bed change and stability depending on hydraulic structure." Journal of KOSHAM, KOSHAM, Vol. 13, No. 3, pp. 157-166.
14 USACE(US Army Corps of Engineers). (2010). HECRAS river analysis system user's manual version 4.1, CPD-68, California, pp. 623-631.
15 Wang, Z.Y., Wu, B., and Wang, G. (2007). "Fluvial processes and morphological response in the Yellow and Weihe river to closure and operation og Sanenxia dam." Geomorphology, Elsevier, Vol. 91, pp. 65-79.   DOI
16 Wu, B., Wang, G., and Xia, J. (2007). "Case study: delayed sedimentation response to inflow and operations at Sanmenxia dam." Journal of Hydraulic Engineering, ASCE, Vol. 133, No. 5, pp. 482-494.   DOI
17 Yeon, K.S., Jeong, S.M., Yun, C.Y., Lee, J.H., and Shin, K.S. (2009). "A riverbed change prediction by rivercrossing structure-focused on the major river reaches of the multifunctional administrative city-." Journal of KOSHAM, KOSHAM, Vol. 9, No. 1, pp. 107-113.
18 Yu, K. (2011). "New concept of average river bed and general trend of river bed change in the Nakdong river." Journal of KCA, KCA, Vol. 11, No. 6, pp. 486-494.
19 Ziegler, C., and Nisbet, B. (1995). "Long-term simulation of fine-grained sediment transport in large reservoir." Journal of Hydraulic Engineering, ASCE, Vol. 121, No. 11, pp. 773-781.   DOI