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Open AccessArticle

Scouring of Replenished Sediment through Reservoir Flood Discharge Affects Suspended Sediment Concentrations at Downstream River Water Intake

1
Hydrotech Research Institute, National Taiwan University, Taipei 10617, Taiwan
2
National Science and Technology Center for Disaster Reduction, New Taipei City 23143, Taiwan
3
Water Resources Research Center, Disaster Prevention Research Institute, Kyoto University, Goka-sho, Uji-shi 611-0011, Japan
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 1998; https://doi.org/10.3390/w11101998
Received: 5 August 2019 / Revised: 17 September 2019 / Accepted: 20 September 2019 / Published: 25 September 2019
(This article belongs to the Special Issue Experimental, Numerical and Field Approaches to Scour Research)
Dredging is a commonly used sedimentation management strategy to remove mechanically deposited sediment from reservoirs. However, dredged sediment disposal is costly. Dredged sediment can be considered a beneficial resource and used for riverbed replenishment to prevent downstream riverbed degradation and improve aquatic habitats. This study investigated the feasibility of using dredged deposits with cohesive sediment for replenishment at the Shihmen Reservoir. Using the criterion of critical scour velocity, we conducted hydraulic assessments and identified the feasible replenishment area as the experimental domain. A physical model was developed to mimic the scouring process in the replenishment area. By applying dynamic similarity for scouring fine replenished sediment, we derived the regression relationship between flow-critical velocity and sediment-dry density, and used it for model ratio scaling of the grain size, dry density, and concentration in the physical model. Scoured sediment concentrations were measured to study the scour ratio at various flood discharges. Experimental results indicated that the scour ratio was related to factors such as flood discharge, flood duration, and water content of the replenished sediment. The reduction ratio of the concentration of sediment scoured from the replenishment area to the concentration of sediment at the downstream water intake was approximately 90% in the present study. View Full-Text
Keywords: dredging; reservoir sedimentation; replenishment; cohesive sediment; scour dredging; reservoir sedimentation; replenishment; cohesive sediment; scour
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MDPI and ACS Style

Lee, F.-Z.; Lai, J.-S.; Guo, W.-D.; Sumi, T. Scouring of Replenished Sediment through Reservoir Flood Discharge Affects Suspended Sediment Concentrations at Downstream River Water Intake. Water 2019, 11, 1998. https://doi.org/10.3390/w11101998

AMA Style

Lee F-Z, Lai J-S, Guo W-D, Sumi T. Scouring of Replenished Sediment through Reservoir Flood Discharge Affects Suspended Sediment Concentrations at Downstream River Water Intake. Water. 2019; 11(10):1998. https://doi.org/10.3390/w11101998

Chicago/Turabian Style

Lee, Fong-Zuo; Lai, Jihn-Sung; Guo, Wen-Dar; Sumi, Tetsuya. 2019. "Scouring of Replenished Sediment through Reservoir Flood Discharge Affects Suspended Sediment Concentrations at Downstream River Water Intake" Water 11, no. 10: 1998. https://doi.org/10.3390/w11101998

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