摘要
河岸崩塌是常见的自然灾害,开展其成因分析对于灾害的预防和治理具有重要意义。吉利涌胜利子围段2023年发生河岸崩塌,为探究其成因,采用河床冲淤分析、数值模拟与岸坡抗滑稳定性计算的方法开展了研究。经分析,吉利涌胜利子围段的岸坡崩塌主要与水动力条件和岸坡的泥沙粒径构成相关,崩岸河段的河岸是由下层粉砂、中砂和上层粉土、粘性土组成的二元结构,2022与2023年洪水期坡脚处的流速大于泥沙起动流速,引发了冲刷过程,致使下层坡脚位置的砂土泥沙因冲刷而不断流失,上层由粘性土构成的岸坡继而失去支撑,发生下陷,造成了此次的河岸崩塌。基于研究分析,提出了抛石护脚护坡的建议。
Riverbank collapse is a kind of common natural disaster.The cause analysis is significant for disaster prevention and control.In 2023,a riverbank collapse occurred in the Shengliziwei section of the Jili River.To explore the causes of this collapse,a comprehensive study was conducted using methods of riverbed scour and sedimentation analysis,numerical simulation,and slope anti-slide stability calculation.The analysis revealed that the riverbank collapse in the Shengliziwei section of the Jili River is mainly related to the hydrodynamic conditions and the grain size composition of the bank slope sediments.The riverbank in the collapsed section consists of a bimodal structure,with fine sand or medium sand at the lower layer,and silt or cohesive soil at the upper layer.During the flood season of 2022 and 2023,the flow velocity at the bottom of the slope exceeds the threshold velocity for sediment incipient motion,leading to the bank erosion.As a result,the sand and silt at the lower part of the slope were continuously washed away due to erosion.The upper bank slope,composed of cohesive soil,subsequently lost its support and collapsed.Based on the study result,the riprap protection at the base and slope of the bank is recommended to address the riverbank collapse issue.
作者
陈家豪
李明
李阳帆
陈晖
洪昌红
Chen Jiahao;Li Ming;Li Yangfan;Chen Hui;Hong Changhong(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou510635,China;Guangdong Provincial Key Laboratory of Hydrodynamics Research,Guangzhou510635,China)
出处
《吉林水利》
2025年第7期30-35,共6页
Jilin Water Resources
基金
广东省科技创新战略专项资金科研项目(项目编号:gdsky2023-03)。
