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针对预见期短已成为水文预报发挥更大效益的主要障碍的问题,基于GPS遥感大气水汽原理,以美国地基GPS监测网为例,验证了地基GPS探测PWV的精度,探讨了利用区域GPS网探测可降水量时最佳网外辅助站数目。结果表明,GPS方法可在降雨发生数小时前提供时空分辨率远高于传统探空探测方法的可降水量序列,且完全满足区域降雨与洪水预报的精度要求;利用区域GPS网监测大气水汽时加入3个网外辅助站为最佳选择。
Aiming at the problem that short-term forecasting has become the main obstacle of hydrological forecasting to play a greater efficiency, based on GPS remote sensing atmospheric vapor theory, the ground-based GPS monitoring network is taken as an example to verify the accuracy of ground-based GPS detection PWV. Precipitable water network when the number of the best auxiliary stations. The results show that the GPS method can provide the precipitation series with much better temporal and spatial resolution than the conventional sounding and detecting methods before the rainfall occurs, and fully meet the accuracy requirements of regional rainfall and flood forecasting. When using the regional GPS network to monitor the atmospheric water vapor Add 3 network auxiliary stations for the best choice.