Geobag stepped spillway for check dams: A pilot study  

作　　者：Shu Yu Fan Yue Qiang Zhang Zuyu Chen Penghai Yin Jianwei Hao Laizhang Zhang Ludong Hao 

机构地区：[1]State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100048,China [2]Northwest Engineering Corporation Limited,Xi'an 710065,China [3]State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China [4]Guilin University of Technology,Guilin 541006,China [5]Upper and Middle Yellow River Bureau,Yellow River Conservancy Commission of the Ministry of Water Resources,Xi'an 710021,China [6]Suide Test Station of Soil and Water Conservation,Yellow River Conservancy Commission of the Ministry of Water Resources,Yulin 719000,China

出　　处：《International Journal of Sediment Research》2023年第1期115-127,共13页国际泥沙研究（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(Grant Nos.41731289 and 51879285);the Research Program on Key Technologies of Water Resources of Ministry of Water Resources of the People's Republic of China(Grant No.GE110145B0032021);the Power Construction Corporation of China(Grant No.DJ-ZDXM-2021-5)。

摘　　要：Check dams are widely used worldwide for the soil and water conservation.Many of them have no spillways,resulting in frequent dam breach failures during heavy rainfall events.This paper proposes a new geobag stepped spillway for small check dams.The structure of the spillway primarily consists of a stepped chute created from geobags filled with local soil compacted and consolidated with a small amount of cement.The developed composite geosynthetic material exhibits water erosion resistance,high strength against puncture,and high tensile strength.To examine the feasibility of the proposed geobag stepped spillway,a prototype pilot test was designed and constructed in a check dam in Shaanxi Province,China,with a height of 10 m and a downstream slope of 1(vertical)to 2(horizontal).More than 30 overflow tests were done for a geobag stepped spillway under uncontrolled and gated weir flow conditions.Based on the measurements of flow velocities and flow depths of four cross sections,it was observed that the energy dissipation ratio ranged between 73.8%and 92.8%for all the examined conditions.In addition,no significant deformation of the geobag stepped spillway was observed,although the maximum flow velocity at the spillway toe was 6.7 m/s.This study confirms that the proposed geobag stepped spillway is a promising approach for providing an effective,safe,and economical flood release structure for small check dams.

关 键 词：Geobag stepped spillways Check dams Composite geosynthetic material Energy dissipation 

分 类 号：TV14[水利工程—水力学及河流动力学]