Changes in hydraulic geometry of the Hwang River below the Hapcheon Re-regulation Dam, South Korea

Shin, Young Ho; Juliën, Pierre Y.

doi:10.1080/15715121003651252

Cited by 27 publications

(17 citation statements)

References 21 publications

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“…This amount decreased to 18 million tons/year after the construction of the Hirfanli Dam (1959), and dropped to 0.46 million tons/year after the construction of the Altinkaya (1987) and Derbent (1990) Dams [35]. The changes in the sediment amount and the flow rate affected the riverbed slope [3,75]. In addition, uncontrolled sand and gravel extractions from the riverbed caused deep excavations in the riverbed.…”

Section: Discussionmentioning

confidence: 99%

Determination of Temporal Changes in the Sinuosity and Braiding Characteristics of the Kizilirmak River, Turkey

Öztürk¹,

Sesli²

2015

Pol. J. Environ. Stud.

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Section: Discussionmentioning

confidence: 99%

Determination of Temporal Changes in the Sinuosity and Braiding Characteristics of the Kizilirmak River, Turkey

Öztürk¹,

Sesli²

2015

Pol. J. Environ. Stud.

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“…Upstream damming can significantly alter the natural flow and sediment regimes entering the downstream rivers, including reduction in the frequency and duration of downstream high flows and the corresponding sediment load, and these changes usually lead to important consequences for geomorphic adjustments (Williams and Wolman, 1984;Long and Chien, 1986;Petts and Gurnell, 2005;Phillips, 2009;Ma et al, 2012;Rubin et al, 2015;Miao et al, 2016). These geomorphic adjustments can include channel degradation, riverbed armouring, reduction in sediment transport, change in longitudinal channel profile, and variation in bankfull channel geometry (Biedenharn et al, 2001;Richard et al, 2005;Wu et al, 2008;Xu and Milliman, 2009;Shin and Julien, 2010;Xia et al, 2014a). A common response to the release of clear water below the dam is degradation of the channel bed, typically at rates much higher than in natural rivers (Knighton, 1998;Ma et al, 2012;Xia et al, 2014a).…”

Section: Introductionmentioning

confidence: 99%

“…A common response to the release of clear water below the dam is degradation of the channel bed, typically at rates much higher than in natural rivers (Knighton, 1998;Ma et al, 2012;Xia et al, 2014a). The variation in bankfull channel geometry is usually dominant owing to channel degradation, compared with other fluvial variables (Phillips et al, 2005;Shin and Julien, 2010;Xia et al, 2014a).…”

Section: Introductionmentioning

confidence: 99%

Geomorphic response of the Jingjiang Reach to the Three Gorges Project operation

Xia

Deng

Zhou

et al. 2016

Earth Surf Processes Landf

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Upstream damming often causes significant downstream geomorphic adjustments. Remarkable channel changes have occurred in the Jingjiang Reach of the Middle Yangtze River, since the onset of the Three Gorges Project (TGP). Therefore, it is important to investigate the variations in different fluvial variables, for better understanding of the channel evolution characteristics as an example of the Jingjiang Reach. Recent geomorphic adjustments in the study reach have been investigated quantitatively, including variations in sediment rating curve, fluvial erosion intensity, channel deformation volume and bankfull channel geometry. These fluvial variables adjusted in varying degrees in response to the altered flow and sediment regime caused by the TGP operation. A focus of this study has been especially on variation in the bankfull channel geometry. Calculated bankfull dimensions at section‐ and reach‐scale indicate that: (i) there were significant bank‐erosion processes in local regions without bank‐protection engineering, with empirical relations being developed to reproduce the variation in bankfull widths at four typical sections; (ii) the variation in the reach‐scale channel geometry occurred mainly in the component of bankfull depth, owing to the construction of large‐scale bank‐revetment works, with the depth increasing from 13.7 m in 2002 to 15.0 m in 2014, and with an increase in the corresponding bankfull area of about 11%; and (iii) the reach‐scale bankfull channel dimensions responded to the previous 5‐year average fluvial erosion intensity during flood seasons at Zhicheng, with higher correlations for the depth and area being obtained when calibrated by the measurements in 2002–2012. Furthermore, these relations developed for the section‐ and reach‐scale bankfull channel geometry were also verified by the observed data in 2013–2014, with encouraging results being obtained. Copyright © 2016 John Wiley & Sons, Ltd.

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“…4. The hypothesis has also been tested on several other rivers including the Jemez River, Wolf Creek and the Arkansas River by Richard et al (2005a) and also on the Hwang River below Hapcheon dam by Shin and Julien (2010). Accordingly, the channel width is a decreasing exponential function of time: …”

Section: Figmentioning

confidence: 99%

Downstream hydraulic geometry of alluvial rivers

Juliën

2015

Proc. IAHS

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This article presents a three-level approach to the analysis of downstream hydraulic geometry. First, empirical concepts based on field observations of 'poised' conditions in irrigation canals are examined. Second, theoretical developments have been made possible by combining basic relationships for the description of flow and sediment transport in alluvial rivers. Third, a relatively new concept of equivalent channel widths is presented. The assumption of equilibrium may describe a perpetual state of change and adjustments. The new concepts define the trade-offs between some hydraulic geometry parameters such as width and slope. The adjustment of river widths and slope typically follows a decreasing exponential function and recent developments indicate how the adjustment time scale can be quantified. Some examples are also presented to illustrate the new concepts presented and the realm of complex river systems.

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Changes in hydraulic geometry of the Hwang River below the Hapcheon Re-regulation Dam, South Korea

Cited by 27 publications

References 21 publications

Determination of Temporal Changes in the Sinuosity and Braiding Characteristics of the Kizilirmak River, Turkey

Determination of Temporal Changes in the Sinuosity and Braiding Characteristics of the Kizilirmak River, Turkey

Geomorphic response of the Jingjiang Reach to the Three Gorges Project operation

Downstream hydraulic geometry of alluvial rivers

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