Experimental Study on Optimizing Energy Dissipation by Adding Pier to Steep Chute of Open Channel in Wet Collapsible Loess Area

LIU Bo-cheng; LI Guang-ning; HAN Yan-cheng; LIU Yong-de; SUN Shuang-ke

doi:10.11988/ckyyb.20230017

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (5) : 95-102. DOI: 10.11988/ckyyb.20230017

Hydraulics

Experimental Study on Optimizing Energy Dissipation by Adding Pier to Steep Chute of Open Channel in Wet Collapsible Loess Area

LIU Bo-cheng^1,2, LI Guang-ning², HAN Yan-cheng¹, LIU Yong-de³, SUN Shuang-ke²

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Abstract

Adding piers to open channel chute is a highly efficient approach for enhancing energy dissipation, and holds a significant technological edge especially under specific conditions. This approach remains relatively unexplored within China’s research fields. We conducted a 1∶30 scale hydraulic model test on adding piers to the open channel chute of a rainwater drainage project in Xiaokongtong gully, Qingyang, Gansu. The initial design revealed that the flow regime was unstable, characterized by outward splashing that potentially harms the structural integrity of the loess slopes. In response, we refined the original design by reducing the spacing between the energy dissipation piers. This modification significantly stabilized the flow. Specifically, reducing the pier spacing from H/i to 0.5H/i under peak flow conditions achieved a 72.5% reduction in water surface fluctuation and a 40.10% decrease in average flow rate, leading to a more uniform water depth distribution along the channel and eliminating the splashing. Moreover, the total energy dissipation rate improved markedly, increasing from 87.9% to 94.6%.

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wet collapsible loess area / adding pier to open channel chute / model test / energy dissipation / water surface fluctuations

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LIU Bo-cheng, LI Guang-ning, HAN Yan-cheng, LIU Yong-de, SUN Shuang-ke. Experimental Study on Optimizing Energy Dissipation by Adding Pier to Steep Chute of Open Channel in Wet Collapsible Loess Area[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(5): 95-102 https://doi.org/10.11988/ckyyb.20230017

References

[1] 张楚汉,王光谦,李铁键.变化环境下城市暴雨致灾防御对策与建议[J].中国科学院院刊,2022,37(8):1126-1131.(ZHANG Chu-han,WANG Guang-qian,LI Tie-jian.Prevention Countermeasures and Suggestions for Urban Rainstorm Disasters under Changing Environment[J]. Bulletin of Chinese Academy of Sciences,2022,37(8):1126-1131.(in Chinese))
[2] 徐宗学, 叶陈雷. 城市暴雨洪涝模拟:原理、模型与展望[J]. 水利学报, 2021, 52(4): 381-392. (XU Zong-xue, YE Chen-lei. Simulation of Urban Flooding/Waterlogging Processes: Principle, Models and Prospects[J]. Journal of Hydraulic Engineering, 2021, 52(4): 381-392.(in Chinese))
[3] 徐宗学, 李鹏, 程涛. 基于海绵城市理念的LID措施优化布局: 以济南市黄台桥流域为例[J]. 南水北调与水利科技(中英文), 2022, 20(3): 552-562. (XU Zong-xue, LI Peng, CHENG Tao. LID Optimization Layout Facilities in Sponge City: a Case Study of Huangtaiqiao Catchment in Jinan City[J]. South-to-North Water Transfers and Water Science & Technology, 2022, 20(3): 552-562.(in Chinese))
[4] 牛樱. 自重湿陷性黄土地区海绵城市建设特点[J]. 城市道桥与防洪, 2020(7): 160-164, 20. (NIU Ying. Construction Characteristics of Sponge City in Dead Load Collapsible Loess Area[J]. Urban Roads Bridges & Flood Control, 2020(7): 160-164, 20.(in Chinese))
[5] 赵经华,侍克斌,马亮,等.库玛拉克河东岸总干渠大陡槽消力池消能效果[J].人民黄河,2011,33(6):120-121.(ZHAO Jing-hua, SHI Ke-bin, MA Liang, et al. Energy Dissipation Effect of Large Steep Trough Stilling Basin in East Bank of Kumarak Main Canal[J]. Yellow River, 2011, 33(6): 120-121.(in Chinese))
[6] 陈齐海, 谢壮初. 急流渠道的陡槽加糙消能实践与经验[J]. 中国农村水利水电, 1996(10): 45-46. (CHEN Qi-hai, XIE Zhuang-chu. Practice and Experience of Energy Dissipation by Roughening Steep Groove in Rapids Channel[J]. China Rural Water and Hydropower, 1996(10): 45-46.(in Chinese))
[7] 冯鹿鹿. 泄水陡坡后的消力池数学计算模型选择[J]. 水利科技与经济, 2015, 21(8): 8-10. (FENG Lu-lu. Selection of Mathematical Calculation Model of Stilling Basin after Steep Slope of Water Discharge[J]. Water Conservancy Science and Technology and Economy, 2015, 21(8): 8-10.(in Chinese))
[8] 闫滨,郭超,郭成久,等.溢洪道陡槽弯道设置导流墙对挑流消能的影响[J].水电能源科学,2010,28(12):54-56.(YAN Bin, GUO Chao, GUO Cheng-jiu, et al. Effect of Guide Wall in Curved Section of Spillway Chute on Ski-jump Energy Dissipation[J]. Water Resources and Power, 2010, 28(12): 54-56.(in Chinese))
[9] 孙双科. 我国高坝泄洪消能研究的最新进展[J]. 中国水利水电科学研究院学报, 2009, 7(2): 249-255. (SUN Shuang-ke. Summary of Research on Flood Discharge and Energy Dissipation of High Dams in China[J]. Journal of China Institute of Water Resources and Hydropower Research, 2009, 7(2): 249-255.(in Chinese))
[10]徐建荣, 柳海涛, 彭育, 等. 基于泄洪雾化影响的白鹤滩水电站坝身泄洪调度方式研究[J]. 中国水利水电科学研究院学报, 2021, 19(5): 449-456, 468. (XU Jian-rong, LIU Hai-tao, PENG Yu, et al. Analysis of Dam Orifice Operation Mode of Baihetan Hydropower Station Based on the Influence of Flood Discharge Atomization[J]. Journal of China Institute of Water Resources and Hydropower Research, 2021, 19(5): 449-456, 468.(in Chinese))
[11]刘士和.高速水流[M].北京:科学出版社,2005:62-79.(LIU Shi-he.High-velocity Flow[M].Beijing:Science Press,2005:62-79.(in Chinese))
[12]洪振国, 苟勤章, 李海华. 水利工程溢洪道底流消能水力特性分析[J]. 排灌机械工程学报, 2022, 40(3): 258-263. (HONG Zhen-guo, GOU Qin-zhang, LI Hai-hua. Analysis of Hydraulic Characteristics of Spillway Underflow Energy Dissipation in Hydraulic Engineering[J]. Journal of Drainage and Irrigation Machinery Engineering, 2022, 40(3): 258-263.(in Chinese))
[13]张明义, 戚印鑫, 高建新. 乌拉泊水库溢洪道消能防冲模型试验研究[J]. 人民黄河, 2010, 32(3): 83-85. (ZHANG Ming-yi, QI Yin-xin, GAO Jian-xin. Experimental Study on Energy Dissipation and Scour Prevention Model of Spillway in Wulabo Reservoir[J]. Yellow River, 2010, 32(3): 83-85.(in Chinese))
[14]李少伟, 张文传, 王均星, 等. 梯形凹角台阶式溢洪道水力特性[J]. 长江科学院院报, 2022, 39(6): 56-63, 68. (LI Shao-wei, ZHANG Wen-chuan, WANG Jun-xing, et al. Hydraulic Characteristics of Stepped Spillway with Trapezoidal Concave Angle[J]. Journal of Yangtze River Scientific Research Institute, 2022, 39(6): 56-63, 68.(in Chinese))
[15]张志昌,曾东洋,刘亚菲.台阶式溢洪道滑行水流水面线和消能效果的试验研究[J].应用力学学报,2005,22(1):30-35,157.(ZHANG Zhi-chang,ZENG Dong-yang,LIU Ya-fei.Experimental Research on the Presented Water-surface Curve of Skimming Flow on Stepped Spillways and Energy Dissipation[J].Chinese Journal of Applied Mechanics,2005,22(1):30-35,157.(in Chinese))
[16]樊帆, 牧振伟, 张红红, 等. 溢洪道弯段糙条消能工消能率试验研究[J]. 长江科学院院报, 2021, 38(12): 104-110. (FAN Fan, MU Zhen-wei, ZHANG Hong-hong, et al. Experimental Research on Energy Dissipation Rate of Rough Strip Energy Dissipator in Spillway Bend[J]. Journal of Yangtze River Scientific Research Institute, 2021, 38(12): 104-110.(in Chinese))
[17]龚振瀛,刘树坤,高季章.宽尾墩和窄缝挑坎—收缩式消能工的应用[J].水力发电学报,1983,2(3):48-57.(GONG Zhen-ying,LIU Shu-kun,GAO Ji-zhang.Convergent Structures to Enhance Energy Dissipation Flaring Gate Piers and Slit-type Flip Buckets[J]. Journal of Hydroelectric Engineering,1983,2(3):48-57.(in Chinese))
[18]尹舒倩. 多级消力池泄水陡坡水力特性试验研究[D]. 乌鲁木齐: 新疆农业大学, 2015. (YIN Shu-qian. Experimental Study on Hydraulic Characteristics of Sluicing Steep Slope Basin Stage[D].Urumqi: Xinjiang Agricultural University, 2015. (in Chinese))
[19]黄智敏,陈卓英,朱红华,等.内凹型和外凸型阶梯陡坡段水力特性研究[J].水资源与水工程学报,2015,26(5):137-140.(HUANG Zhi-min, CHEN Zhuo-ying, ZHU Hong-hua, et al. Study on Hydraulic Characteristics in Steep Slope Section of Inner Concave and Outer Convex[J]. Journal of Water Resources and Water Engineering, 2015, 26(5): 137-140.(in Chinese))
[20]华东水利学院. 泄水与过坝建筑物水工设计手册(第6卷)[M]. 北京:中国水利水电出版社, 1987. (Hohai University. Handbook of Hydraulic Design of Flow Discharge and Overflow Structure: Volume 6[M]. Beijing: China Water & Power Press, 1987.(in Chinese))
[21]郭睿. 关中地区黄土湿陷性及其防治对策的研究[D]. 西安: 西安科技大学, 2003. (GUO Rui. Collapsibility and Prevention and Countermeasure of Loess in Guanzhong Area[D].Xi’an: Xi’an University of Science and Technology, 2003. (in Chinese))
[22]郭子中. 消能防冲原理与水力设计[M]. 北京:科学出版社,1982. (GUO Zi-zhong. Principle of Energy Dissipation and Hydraulic Design[M]. Beijing: Science Press, 1982.(in Chinese))
[23]胡良明,胡志鹏,谢学东,等.某山区溢洪道流态优化和消能试验研究[J].人民黄河,2020,42(3):87-91.(HU Liang-ming,HU Zhi-peng,XIE Xue-dong,et al.Experimental Study on Flow Regime Optimization and Energy Dissipation of a Flood Spillaway in a Mountainous Area[J].Yellow River,2020,42(3):87-91.(in Chinese))