海潮负荷效应是大地测量和地球物理观测中一个非常重要的信号。海潮负荷的影响在沿海地区对重力、倾斜和位移的影响已经远远超过了目前仪器的观测精度，而且我国幅员辽阔、具有较长的海岸线且岛屿众多，因此很有必要建立一个适合于在我国沿海和岛屿实施的重力、水准和GPS测量的高精度海潮负荷改正模型。基于此，本项目拟首先根据顾及Crust2.0地壳模型的地球模型、最新的全球和区域不同海潮模型、高空间分辨率的海陆边界、全球海水密度模型，基于积分格林函数方法对海潮负荷的计算进行综合研究，分析这些计算模型对结果的影响，并以实际观测资料作为约束，获得适合于中国区域海潮负荷计算的最优计算模型；然后利用海潮模型和数字高程模型确定由于海水涨落导致的动态海陆边界，结合最优的计算模型计算海潮负荷对重力、倾斜和位移的影响，构建我国沿海和岛屿高空间分辨率的海潮负荷改正模型，并以实测的重力、水准和GPS观测资料评估所构建模型的精度。

Ocean tide loading effect is an important signal in geodesy and geophysics. The magnitudes of ocean tide loading on gravity, tilt and displacement are far larger than the contemporary accuracies of the corrsponding instruments. Furthermore, our country has broad area and long coastline and has a lot of islands, therefore it is necessary to construct the accurate ocean tide loading correction models for gravity, leveling and GPS measurements over coastal area and islands.Consequently, this project is about to comprehensively study the computation of ocean tide loading effect by using earth model which takes the Crust2.0 crust model into account,some latest global and regional ocean tide models and a high spatial resolution land-sea boundary as well as a density model of global ocean mass in terms of the integrated Green's function method, and to analyze these computation models'impacts on the result.As a result,the optimal computation models will be determined for ocean tide loading computation,using the observational data as constraints.Then according to the optimal computation models, the correction models of gravity, tilt and displacement due to ocean tide loading over coastal area and islands will be constructed considering ocean-tides-induced dynamical land-sea boundary which will be defined by a high resolution digital elevation model and ocean tide model. Meanwhile, the measurements of gravity, leveling and GPS will be used to evaluate the precisions of the constructed ocean tide loading correction models.