浅水分潮对海岸潮致地下水波动特征的影响

基于一维Boussinesq方程,在斜坡海岸边界条件中考虑了半日潮及其浅水分潮的综合作用,应用摄动法得到了方程的二阶解。通过与现场实测资料和数值解的比较,分析了浅水分潮对海岸潮致地下水波动特征的影响。分析结果显示,考虑浅水分潮后,方程数值解能较好地反映实测的潮致地下水波动基本特征;方程各阶摄动解虽与现场实测数据有一定误差,但基本上能反映其波动的趋势性特征。研究结果表明,浅水分潮对海岸潮致地下水波动振幅及其超高值的影响比较显著,也能较好地改善相位上的偏移,因此在对海岸潮致地下水波动特征进行研究分析时,应该考虑浅水分潮的作用。

On the influence of shallow water constituent on tide-induced groundwater fluctuations in coastal area

Based on the one-dimensional Boussinesq equation, and considering the comprehensive effect of semidiurnal tide and shallow water constituent under the boundary condition of sloping beaches, the second-order perturbation solution is derived. By analysing the influence of shallow water constituent on tide-induced groundwater fluctuations, field data and numerical resullts are compared. The results show that after considering shallow water constituent, the numerical solutions can better reflect the basic characteristics of measured tide-induced groundwater fluctuations;and each order perturbation solution has certain disagreeable values with the field data, but basically reflects the trend characteristics of the fluctuations. The results indicate that the shallow water constituent has significant effects on the amplitude and over height of tide induced groundwater fluctuations, which can also better improve the phase shift. Therefore, when studying the tide induced groundwater fluctuations in coastal area, the effect of shallow water constituent should be considered.