双台风期间横沙八期超大滩涂圈围工程基准站ZTD影响研究

Impact study on base station ZTD in Hengsha super tidal flat reclamation phase Ⅷ project during binary typhoons

水汽在灾害性天气演变能量传输中至关重要,受其影响GNSS信号传播过程中对流层延迟会发生相应变化,通过研究GNSS观测中对流层延迟演化特征可间接分析极端天气发展规律。为分析ZTD短临时计算关键因素,计算了0.5 h对流层天顶延迟,其精度可达到与1 h、2 h相当的精度;采用超快速精密星历参与数据处理可获得与最终精密星历相当的精度,通过上述参数配置可计算短临时对流层天顶延迟。为分析台风对局域ZTD的影响,以横沙八期超大滩涂圈围工程基准站为例,讨论了2016年9月双台风"莫兰蒂"和"马勒卡"影响期间项目区上空对流层天顶延迟的演化过程,分析得到台风对局域ZTD的影响,与其距离和强度关系密切。

Water vapor is critical in the evolution of energy in severe weather, due to which the tropospheric delay in theprocess of GNSS signal propagation will change accordingly. The development of extreme weather can be analyzed indirectly bystudying the tropospheric delay evolution characteristics in GNSS observations. In order to analyze the key factors of shorttemporary ZTD calculation, we calculated the half an hour zenith tropospheric delay, the precision can reach to the accuracy of1 hour or 2 hours calculation. Using ultra-fast precise ephemeris shall render the accuracy of final precise ephemeris in dataprocessing. The short temporary zenith tropospheric delay can be calculated by the parameter configuration described above.For the impact of typhoon on the local ZTD, taking base station of Hengsha super tidal flat reclamation phase VIII project as anexample, we discussed the evolution of the zenith tropospheric delay over the project area during the period of the binarytyphoons ＂Meranti＂ and ＂Malakas＂ in September 2016, thus confirmed typhoon＇s influence on the local ZTD in respect of itsdistance and intensity.