中文摘要：

针对受到快速涨落潮位作用的海堤进行非稳定渗流有限元分析，在此基础上结合实测渗压序列构建目标函数对海堤的渗透参数进行反演研究．反演中采用分层搜索技术，先由逐步扫描法确定出渗透参数一个合理的小区间，再用一阶梯度优化方法在该小区间上进行迭代优化以获得合适的渗透参数．以反演得到的渗透参数进行海堤非稳定渗流数值模拟，算例表明，计算及反演步骤合理可行，模拟计算得到的渗压结果与实测序列在数值和动态变化规律上都取得了理想的拟合效果．

英文摘要：

Unsteady seepage of seawall was studied by using the finite element method in view of the effect of rapid fluctuation tidal. The back analysis objective function was constructed based on the finite element analysis results together with monitoring values. Then, the back analysis process of the permeability pa- rameters of seawall was presented. The hierarchical searching technique was used in the back analysis. The small reasonable region of parameters was determined by the stepwise scanning method while the first order gradient optimization algorithm was used to confirm permeability parameters in the above region. The permeability parameters confirmed by back analysis were used in seawall unsteady seepage calculation. The instance shoves that the calculation and back analysis process are reasonable and feasible, and the seep- age pressure simulation results agree very well with monitoring sequences not only in numerical values but also in dynamic rules.