基于GIS的绿潮漂移预测数值模拟系统的建设与应用分析

Construction and application analysis of a GIS-based numerical simulation system for forecast of green tide drift

实现了海洋数值模式计算与地理信息系统(GIS)空间分析及产品制作的集成。针对数值模式计算时间长的问题,从空间数据组织角度研究了绿潮数值模式的并行计算,将数据与计算模式按空间范围进行分解并建立其对应的空间索引,实现了分区计算过程自动化,大幅缩短了计算时间。采用GIS空间表达技术,研究了绿潮数值模拟结果在GIS中的可视化,将绿潮预测结果转换为以散点表示的绿潮覆盖点与以边框线表示的绿潮分布范围,并以矢量元素实时绘制,实现了绿潮漂移过程的空间动态表达。采用GIS专题地图制作技术,结合绿潮业务化特点,研究了绿潮预测产品的业务化制作,从长时间序列数据查询与抽取、多源预报数据综合、标准化报告等角度,实现了绿潮专题图与快报等产品的标准化输出。

The numerical oceanic mode and the geographic information system （GIS） were integrated to perform the spatial analysis and product fabrication of forecasting of green tide drift. The green tide mode was calculated with the parallel computing technique based on the spatial data structure to shorten the numerical mode computing time. The source data and the simulation modes of green tide were divided based on the spatial distribution, and the corresponding spatial indexes were respectively built to automatically implement the numerical simulation of each partition. The results of the numerical simulation of green tide were expressed in the GIS environment with the spatial visualization technique. The forecasting results were expressed with the discrete points and the border lines as the distribution of green tide which were drawn with the vector elements in real time to achieve the visualization of the green tide drift procedure. The operational products of green tide forecasting were made with the thematic mapping technique in GIS based on the operational characteristics of green tide, including the inquiry and extraction of long time series, the integration of multi-source forecasting data, the normalized reports, etc. The thematic maps and bulletins of green tide can be normally released to satisfy the requirements of monitoring and management of green tide.