摘要
海塘塘脚冲刷是影响河口海塘结构稳定的主要因素之一。准确把握河口区复杂水动力下海塘塘脚冲淤规律并提出精准的海塘塘脚冲刷预测方法,对保障海塘工程安全起着重要作用。为此,以钱塘江河口西江塘海塘为例,利用2010年以来的逐月实测断面监测资料,分析了海塘塘脚冲淤的变化规律,并基于悬移质挟沙力输沙和河床变形理论,提出了基于过程的非恒定水流下塘脚冲刷预测方法,利用该方法计算了其塘脚冲刷深度。结果表明,西江塘段海塘呈现洪冲潮淤的变化规律,其塘脚冲刷的临界径流量约为5 000 m~3/s,冲刷预测误差可降低到20%以内,预测精度得到明显提升。
The scour of seawall toe is the one of the main factors for influencing structural stability of seawall estuary.The study of the scour characteristics at seawall toe under complex hydrodynamics and prediction method is of great significance for the seawall stability.Based on the field monthly measured topographic data since 2010,the time evolution of toe scour at Xijiangtang Seawall in Qiantang Estuary was discussed and the influence of flood was identified.The research results show that the seawall toe is eroded during flood,while there is silting during tide,and the critical flood discharge for scouring is about 5 000 m~3/s.Based on the theory of sediment carrying capacity and riverbed deformation,a new scour prediction method is developed and the relative error is significantly improved within 20%.
作者
张芝永
陈甫源
曾剑
杨元平
何昆
ZHANG Zhi-yong;CHEN Fu-yuan;ZENG Jian;YANG Yuan-ping;HE Kun(Zhejiang Institute of Hydraulics and Estuary,Hangzhou 310020,China;Key Laboratory of Estuary and Coast of Zhejiang Province,Hangzhou 310020,China)
出处
《水电能源科学》
北大核心
2023年第11期35-38,共4页
Water Resources and Power
基金
浙江省自然科学基金水利联合基金重大项目(LZJWD22E090002)
浙江省水利河口研究院院长基金(ZIHE21Z007)
浙江省省属科研院所扶持专项(河口A21014)。
关键词
河口
塘脚冲刷
挟沙力
预测方法
estuary
seawall toe scour
sediment carrying capacity
prediction method
