辽东湾沉积物石油类GIS空间插值研究

Study on GIS Spatial Interpolation of Petroleum Hydrocarbon in Sediments from the Liaodong Bay

为了客观准确地反映辽东湾海域沉积物中石油类含量的空间分布特征,文中基于GIS的地统计分析模块,对2015年辽东湾海域沉积物石油类调查数据进行探索性数据分析,分别运用反距离权重法、普通克里金法、规则样条函数法和张力样条函数法进行空间插值,采用交叉检验方法对插值精度进行了评估。结果表明:插值精度张力样条函数法>规则样条函数法>反距离权重法>普通克里金法,整体上4种插值方法均能客观地模拟出沉积物石油类含量的空间分布趋势。在局部区域,张力样条函数法插值预测结果更接近真实测量值。辽东湾海域沉积物石油类宜采用张力样条函数法进行空间插值。

In order to objectively and accurately reflect the spatial distribution characteristics of petroleum hydrocarbon in sediments from the Liaodong Bay,exploratory data analysis was conducted on the survey data of petroleum hydrocarbon in sediments from the Liaodong Bay of the Bohai Sea in 2015 based on the geostatistical analysis module of GIS.Four interpolation methods,including inverse distance weighting,ordinary kriging,regularize spline and tension spline,were applied to the spatial interpolation,of which the accuracy was evaluated by cross-checking method.The results indicated that the interpolation accuracies of the four methods were as follows:tension spline>regularize spline>inverse distance weighting>ordinary kriging.The spatial distribution trend of petroleum hydrocarbon in sediments can be all simulated by the four interpolation methods objectively,in which the tension spline method showed the closest results to real measurements in the local areas.So the tension spline method is the most suitable interpolation method for the data analysis of petroleum hydrocarbon in sediments from the Liaodong Bay.