短距离无线微波链路降雨反演模型研究  

Study on a rainfall intensity retrieval model for short links

作　　者：陈渝青 郑鑫[1,2,3] 宋莹[1,2,3] 张驰 朱信宇[4] 叶文杰 沈玉芳 杨涛 CHEN Yuqing;ZHENG Xin;SONG Ying;ZHANG Chi;ZHU Xinyu;YE Wenjie;SHEN Yufang;YANG Tao(The National Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China;Yangtze Institute for Conservation and Development,Hohai University,Nanjing 210098,China;College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;Huntsman School of Business,Utah State University,Logan 84322,USA)

机构地区：[1]河海大学水灾害防御全国重点实验室,南京210098 [2]河海大学长江保护与绿色发展研究院,南京210098 [3]河海大学水文水资源学院,南京210098 [4]犹他州立大学洪博培商学院,洛根84322

出　　处：《电波科学学报》2024年第3期579-586,共8页Chinese Journal of Radio Science

基　　金：国家自然科学基金(51879068);国家重点研发计划(2018YFC0407906)。

摘　　要：利用商用微波链路进行降雨反演是一种新型的降雨监测手段,且随着通信技术的发展,高密度的商用微波链路网络可提供更高空间分辨率的降雨空间反演结果。目前,幂律模型被广泛用于研究微波衰减与雨率的关系,该模型对长度超过1 km的链路反演精度较高,但在反演短链路(长度<1 km)雨强时出现显著的降雨强度过高估计问题。针对此问题,本文基于ITU-R P.530-16建议书中长期雨衰减公式,建立了雨强反演模型。在瑞典哥德堡地区对该模型进行了验证,并对比分析了本文模型与幂律模型降雨反演结果。结果表明,相比于幂律模型,本文模型在对短链路进行雨强反演时更稳定、精确,确定性系数提升了55.3%,标准化均方根误差下降了76.2%,累计降雨量误差下降了92.4%。本文研究结果为短链路在反演降雨时出现的过高估计问题提供了一个解决思路。Rainfall retrieving via commercial microwave links is a new rainfall monitoring method.With the development of communication technology,high-density commercial microwave link networks can provide higher spatial resolution rainfall retrieval results.At present,the power-law model has been widely used to study the relationship between microwave attenuation and rainfall rate.The model has high inversion accuracy for links over 1 km in length,but there is a significant overestimation when retrieving short links(length<1 km).In response to this issue,this paper studies the long-term rain attenuation calculation formula provided in the ITU-R P.530-16 recommendation,and established the corresponding rainfall retrieval model.The model was validated in Gothenburg,Sweden,and the rainfall retrieval results of the P.530-16 model and the power-law model are compared and analyzed.The results show that compared to the power-law model,the P.530-16 model is more stable and accurate in retrieving rainfall intensity over short links,with a 55.3%increase in coefficient of determination,a 76.2%decrease in normalized root mean squared error,and a 92.4%decrease in relative error of rainfall depth.The results of this paper provide a solution to the problem of overestimation when inverting rainfall over short links.

关 键 词：降雨反演 商用微波链路 雨衰 降雨监测 雨强 

分 类 号：P412.13[天文地球—大气科学及气象学]