浅水分潮对海岸地下水波动影响初步研究

Primary Study on the Influence of Shallow Water Constituents on Coastal Groundwater Fluctuations

基于一维Boussinesq方程,在斜坡海岸边界条件中综合考虑了半日潮及其浅水分潮的作用,得到了方程的二阶摄动解,并结合现场实测资料,比较分析了浅水分潮对海岸地下水波动的影响。分析结果显示,考虑浅水分潮后,其摄动解较之仅考虑半日潮的同阶解与现场实测数据更为接近,而且解的阶数越高,解的精度越高。研究结果表明,浅水分潮对海岸地下水波动振幅的影响比较显著,也能较好地改善相位上的偏移。因此,在对海岸地下水波动研究时,应该考虑浅水分潮的作用。

Based on the one-dimensional Boussinesq equation, considering the semidiurnal tide and shallow water constituents under the boundary conditions of sloping beaches, the second-order perturbation solution is de- rived, and combining with field datas, comparing and analysing the influence of shallow water constituents on coast- al groundwater fluctuations. The results show that, after considering shallow water constituents, the perturbation so- lution comparing to which only considering the semidiurnal is closer to field datas. And with higher order solutions, the accuracy of the perturbation solution is higher. The results indicate that, the shallow water constituents have significant effect on the amplitude of coastal groundwater fluctuations, which can also better improve the phase off- set. Therefore, when studying on coastal groundwater fluctuations, the effect of shallow water constituents should be considered.