研究中国东海沉积物变化问题具有重要的科学意义。目前主要有两种研究方法，即传统的现场沉积核测量方法和现代大地测量方法；沉积核测量方法具有成本大、效率低以及无法得到时间变化率的致命缺点，而大地测量方法是一个有效的新途径，但是目前还没有进行过合理有效研究。为了合理有效的研究中国东海地区的沉积质量变化，本项目拟利用重力卫星GRACE以及GRACE Follow-on观测数据，结合现场沉积核数据、气象数据，并考虑合理的物理模型以及数据处理方法，计算中国东海沉积地区的沉积质量变化速率，研究东海沉积物的季节性变化，分析解释影响重力信号变化的主要物理因素。基于该研究的结果进一步分析整个中国东部海域与中国大陆之间的质量迁移过程和机理。

It is of great scientific significance to study sediment changes in the East China Sea. At present, there are two main research methods: the traditional in-situ sedimentary nuclear measurement method and the modern geodetic method; the sedimentary nuclear measurement method has the fatal shortcomings of high cost, low efficiency and the inability to obtain the time-varying rate, while the geodetic method has not been studied reasonably and effectively. In order to study the sediment quality change in the East China Sea reasonably and effectively, this project plans to use GRACE and GRACE Follow-on observation data of gravity satellite, combined with in-situ sedimentary nuclear data and meteorological data, and considering reasonable physical models and data processing methods, calculate the sediment quality change rate in the East China Sea sediment area, and study the seasonal variation of sediments in the East China Sea. The main physical factors affecting the variation of gravity signals are analyzed and explained. Based on the results of this study, the process and mechanism of mass transfer between the whole eastern China sea area and the mainland of China are further analyzed.