基于DEM数据的古沉积面的重建方法--以青藏高原东北缘青海贵德盆地为例  

A method of reconstructing the paleosurface based on EDM data—A case study of the Guide basin, Qinghai, China, on the northeastern margin of the Qinghai-Tibet Plateau

作　　者：高明星[1,2,3] 刘少峰[1,2,3] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学岩石圈构造、深部过程及探测技术教育部重点实验室,北京100083 [3]中国地质大学北京地球科学与资源学院,北京100083

出　　处：《地质通报》2008年第4期545-551,共7页Geological Bulletin of China

基　　金：国家自然科学基金项目(编号:40672135);中国地质调查局地质调查工作项目(编号:1212010660601)资助

摘　　要：广泛使用的数字高程模型(DEM)数据使得古沉积面的恢复成为可能。以青藏高原东北缘的青海贵德盆地为例,分析对比了前人获取代表古沉积面地表露头样本数据的几种方法,提出了插值样本应选择露头中代表原始沉积地层的顶面点的优选方法,并提取了更新统地表露头顶面点的样本数据。通过分析样本的特征、比较插值的结果,选择了自然邻点法进行插值预测,重建了贵德盆地更新统的古沉积面。正确样本点的提取加上合适插值算法的选择,优化了重建的古沉积面。The extensively used digital elevation model （DEM） data make it possible to reconstruct the paleosurface, In this paper, take the Guide basin for example, several methods for extracting the data of surface exposure samples representing the paleosurface have been analyzed and compared. The authors propose an optimal method, i.e. the top point representing the original sedimentary strata in the outcrops should be selected as the interpolated sample. They extracted the sample data of the top of the Pleistocene surface outcrop. Based on an analysis of the sample characters and a comparison of the interpohted values, the natural neighbor interpohtion has been adopted to reconstruct the Pleistocene paleosurface of the study area, The error of the reconstructed paleosurface has been decreased by using the proper interpolation to the properly selected samples. The extraction of correct sample points plus the selection of the proper interpolation have optimized the reconstruction of the paleosurface.

关 键 词：DEM 沉积面 空间插值 自然邻点法 

分 类 号：P512.2[天文地球—地质学]