EGM2008重力场模型在南水北调中线工程中的应用  

Application of EGM2008 model in the middle route of South-to-North Water Transfer Project

作　　者：王铁生[1] 缑慧娟 杨成龙[3] 

机构地区：[1]华北水利水电大学,郑州450011 [2]贵州省水利电力学校,贵阳550002 [3]中国电建集团贵阳勘测设计研究院有限公司,贵阳550001

出　　处：《南水北调与水利科技》2014年第5期193-195,共3页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金项目(41101373)

摘　　要：针对南水北调中线工程具有线路长、地势较平坦的特点,提出利用EGM2008地球重力场模型的方法。以水准测量成果为真实值,计算高程拟合内外符合精度及每公里高差中误差,评定EGM2008模型与平面拟合方法的高程拟合精度。结合南水北调中线工程实例表明,EGM2008模型获取正常高结果可以达到四等水准测量要求,且拟合精度优于平面拟合精度。因此,EGM2008地球重力场模型在高程测量中的应用,有助于实现南水北调中线工程中平面和高程控制测量的一体化。In terms of the characteristics of long route and smooth terrain of the Middle Route of the South-to-North Water Transfer Project, this paper proposed a method to calculate the height anomaly and obtain the normal height using the EGM2008 model. The leveling results were considered as the true values, the elevation fitting precision and error in the elevation difference per kilometer were calculated, and the height fitting precision based on the EGM2008 model and plane fitting method was evaluated. According to the engineering example, it showed that the normal height results obtaining from the EGM2008 model can meet the demand of fourth-grade-leveling and the fitting precision is better than that obtained from the plane fitting method. Thus, EGM2008 model can realize the integration of horizontal and vertical control survey in the Middle Route of the South-to-North Water Transfer Project.

关 键 词：南水北调 GPS 高程异常 EGM2008 模型 平面拟合法 残差 拟合精度 

分 类 号：TU198.2[建筑科学—建筑理论]