曹娥江大闸闸下地形影响因素分析及预测  

Analysis and prediction of the factors influencing the terrain under the Cao'e River sluice gate

作　　者：林一楠[1,2] 潘虹 胡成飞 郑国诞[1,2] 杨伟军 LIN Yinan;PAN Hong;HU Chengfei;ZHENG Guodan;YANG Weijun(Zhejiang Institute of Hydraulics and Estuary,Hangzhou 310020,China;Zhejiang Provincial Key Laboratory of Estuary and Coast,Hangzhou 310020,China;Shaoxing Cao'e River Basin Center,Shaoxing 312366,China)

机构地区：[1]浙江省水利河口研究院,浙江杭州310020 [2]浙江省河口海岸重点实验室,浙江杭州310020 [3]绍兴市曹娥江流域中心,浙江绍兴312366

出　　处：《水利水运工程学报》2024年第6期97-102,共6页Hydro-Science and Engineering

基　　金：浙江省水利厅科技计划项目(RC2020);浙江省省属科研院所扶持专项(ZIHEYS22001)。

摘　　要：曹娥江大闸建成以来闸下冲刷问题比较突出,已陆续实施了3次防冲加固措施。为厘清闸下冲淤规律及其主要影响因素,基于长系列实测资料、数学模型成果和物理模型试验数据,分析了钱塘江涌潮、大闸泄水量和前期地形对闸下冲淤的影响。研究表明:(1)钱塘江涌潮会造成闸下大范围淤积,在大闸不泄水情况下,闸下单月平均淤积可达2.2 m;(2)大闸泄流时将闸下泥沙向下游单向输移,是造成闸下河床刷深的主要动力因素。由闸门泄水量和闸下冲刷幅度关系可知,闸门泄水量越大则闸下最深点高程降幅越大;(3)闸下前期地形也是影响冲淤幅度的重要因素,在闸门泄水量不变情况下,前期地形越高则冲刷幅度越大。通过多元回归分析建立了与大闸泄水量、前期地形相关的闸下冲刷幅度预测计算式,可为大闸的运行调度和闸下防冲提供参考。Since the completion of the Cao’e River sluice gate,problems related to scouring beneath the gate have been significant,with three rounds of anti-scour reinforcement measures implemented successively.To clarify the patterns of scouring and sedimentation beneath the gate and its main influencing factors,this study analyzed the impact of Qiantang River tidal bore,sluice gate discharge,and prior terrain on the scouring and sedimentation processes.This analysis was based on long-term empirical data,mathematical model results,and physical model experiment data.The research indicates that:(1)The tidal bore of the Qiantang River causes significant sediment deposition beneath the gate,with average monthly sedimentation reaching up to 2.2 m under no gate discharge conditions;(2)sluice gate discharge constitutes the primary dynamic factor responsible for deepening the riverbed beneath the gate by unilaterally transferring the sediment downstream.The relationship between gate discharge and the extent of scouring indicates that greater gate discharge results in a more significant decrease in the deepest elevation point beneath the gate;(3)the prior terrain beneath the gate also significantly impacts the extent of scouring and sedimentation.Under constant gate discharge,a higher initial terrain results in greater scouring.Through multiple regression analysis,a predictive model correlating sluice gate discharge and initial terrain with the extent of scouring beneath the gate was established,providing a reference for the operation and anti-scouring measures of the sluice gate.

关 键 词：冲刷 多元回归分析 曹娥江大闸 

分 类 号：TV131[水利工程—水力学及河流动力学]