| 摘要: |
| 曹娥江大闸系我国已建的潮汐河口最大挡潮闸,大闸建成以来闸下冲刷问题比较突出,已经陆续实施了三次防冲加固措施。为了摸清闸下冲淤规律及其主要影响因素,本文基于长系列的闸下实测地形和大闸泄水资料,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。研究成果表明：(1)钱塘江涌潮会造成闸下大范围的普遍淤积,在大闸不泄水的情况下,闸下单月平均淤积幅度可达2.2 m；(2)大闸泄流时将闸下泥沙向下游单向搬运,是造成闸下河床刷深的主要动力因素。将闸门泄流量和闸下冲刷幅度建立关系可知,闸门泄流量越大则闸下最深点高程降低幅度越大；(3)闸下前期地形也是影响冲淤幅度的重要因素之一,在闸门泄流量接近的情况下,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流量、前期地形相关的闸下冲刷高程预测公式,可为大闸的运行调度提供参考。 |
| 关键词: 曹娥江大闸、冲刷、实测资料分析、多元回归分析 |
| DOI： |
| 分类号:TV131 |
| 基金项目: |
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| Analysis of influencing factors and prediction of terrain downstream of the Cao"e River Sluice |
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LinYinan, HUChengfei, FANLidong
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Zhejiang Institute of Hydraulics and Estuary
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| Abstract: |
| The Cao"e River Sluice is the largest floodsluice built in China for tidal estuaries, Since the construction of the sluice, the problem of scouring downstream of the sluice has been quite prominent, three anti scour reinforcement measures have been implemented in succession. In order to understand the law of scouring and sedimentation downstream of the sluice and its main influencing factors, this article analyzes the impact of Qiantang River tidal bore, sluice discharge, and previous terrain on downstream scouring and sedimentation based on a long series of measured terrain and sluice discharge data. The research results indicate that: (1) The tidal bore of the Qiantang River will cause widespread sedimentation downstream of the sluice, and the average monthly sedimentation amplitude downstream of the sluice can reach 2.2 meters without water discharge;(2) The one-way transport of sediment downstream during the discharge of the sluice is the main dynamic factor causing the scouring. Establishing a relationship between the sluice discharge and the scouring amplitude downstream of the sluice indicates that the larger the sluice discharge, the greater the decrease in the elevation of the deepest point under the sluice;(3) The terrain in the early stage downstream of the sluice is also one of the important factors affecting the scouring and sedimentation amplitude. When the sluice discharge is close, the higher the terrain in the early stage, the greater the scouring amplitude. A prediction formula for the scouring elevation downstream of the sluice related to the discharge of the sluice and the previous terrain was established through multiple regression analysis, which can provide reference for the operation and scheduling of the sluice. |
| Key words: Cao"e River Sluice Scouring Analysis of measured data Multiple regression |
