应强,张幸农,罗龙洪,等. 基于父子型窝塘地形变化探讨窝崩机理[J]. 水利水运工程学报,2020(3):37-42. doi: 10.12170/20190425002
引用本文: 应强,张幸农,罗龙洪,等. 基于父子型窝塘地形变化探讨窝崩机理[J]. 水利水运工程学报,2020(3):37-42. doi: 10.12170/20190425002
(YING Qiang, ZHANG Xingnong, LUO Longhong, et al. Discussion on the mechanism of pit collapse based on topographic change of the father-son’s caving pond[J]. Hydro-Science and Engineering, 2020(3): 37-42. (in Chinese)). doi: 10.12170/20190425002
Citation: (YING Qiang, ZHANG Xingnong, LUO Longhong, et al. Discussion on the mechanism of pit collapse based on topographic change of the father-son’s caving pond[J]. Hydro-Science and Engineering, 2020(3): 37-42. (in Chinese)). doi: 10.12170/20190425002

基于父子型窝塘地形变化探讨窝崩机理

Discussion on the mechanism of pit collapse based on topographic change of the father-son’s caving pond

  • 摘要: 窝崩涉及水与土的交互作用,因其发展速度快,且位于水下难以观测,故其发展过程和运移规律很难掌握,对窝崩的成因机理也存在不同观点。选择长江下游和畅洲左汊洲头进口侧2012年发生的窝崩(子窝崩)作为研究对象,此窝崩是在原已发生窝崩(父窝崩)的窝塘湾腰上的继发性窝崩,比较了父窝塘及口门附近长江深槽窝崩前4年的地形变化,发现窝崩口门外长江地形呈淤积状态,这与已往认为窝崩是由深槽冲蚀引起的概念不相符。父窝塘上湾腰地形2010年11月至2012年2月间淤积,2012年2月至2012年10月窝崩前无地形资料比较,根据水文资料分析,推测为冲刷,说明在较浅槽一个水文年内的河床冲刷可引发窝崩。子窝崩发生前后,父窝塘下部区域地形变化不大,说明窝崩产生的泥沙在近底层向较低处输移,对周边相对较高河床地形影响不大。

     

    Abstract: The pit collapse is a sloop failure that involves the interaction of water and soil. Its formation mechanism is still not fully understood because of its rapid development and difficult observation under water. A typical collapse occurring at the entrance of the left branch of Hechangzhou Island in 2012 in the lower Yangtze River, which is a reoccurring failure with a father-son’s caving pond, is chosen as a case study by comparing the topographic changes of the main channel near the mouth of the pond in the past four years before the son’s collapse. It is shown that there was siltation in the main channel with no erosion, which is inconsistent with the common situation. The topography changes of the pond upstream bend between 2011 and 2012 indicate that the pit collapse can occur when the riverbed of a shallow trough within a hydrological year is scoured. Before and after the occurrence of the son’s collapse, the bending topography of the downstream side of the father's scour pools did not change much, which indicated that the sediment generated by the pit collapse moved from the bottom to the lower level, and had little effect on the relatively high riverbed topography around it.

     

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