Virtual geographic environment-based integrated rockfall risk simulation method for canyon bridges     

Yulin Ding  Yuting Wu  Qing Zhu  Liguo Zhang  Qianqian Sun  Weixi Wang 《Transactions in GIS》2023,27(3):797-820

Bridges located in mountainous areas are vulnerable to rockfall accidents, posing a threat to bridge engineering construction and operation safety in these regions. Under the coupling effect of complex environments and engineering disturbances, integrated rockfall risk simulation has become increasingly important for canyon bridge structural protection in long-term construction and operation phases. One of the main scientific challenges in rockfall risk simulation is studying the interaction between rockfalls and the topography and engineering environments during consecutive contacts. To systematically simulate the integrated bridge rockfall risk, an integrated construction of multivariable elements coupled with rockfall risk environments and scenarios is required. In this article, we proposed a VGE-based integrated rockfall scenario simulation method that uses the “associated representation—integrated modelling—interactional simulation” core strategy. Our method constructs a virtual rockfall risk environment by fusing multisource data to represent rockfall factors that induce rockfall disasters, hazard-forming environments, and elements at risk. We design rockfall scenarios under different bridge engineering construction conditions and extreme environmental conditions to analyze the interactional rockfall risks. The results demonstrate that our method enables a systematic analysis of the potential integrated rockfall risk, providing realistic reference value for the timely and effective disposal of emergencies, and reducing the harm and losses caused by such emergencies.  相似文献   

2019年冬季北京海陀山局地环流特征及机理分析     

王倩倩  权建农  程志刚  张曼  薛海乐  伍永学 《气象学报》2022,80(1):93-107

海陀山作为北京冬(残)奥会的主要室外赛场之一,其复杂的地形对风场的精细化预报提出了严峻的挑战,亟需开展加密的风场观测提高对复杂地形下局地环流特征及其影响机理的认识,并为提升赛区精细化预报与服务提供数据支撑.基于2019年度海陀山观测试验,利用加密自动气象站、激光测风雷达、涡动相关仪、云高仪等多源数据,对海陀山风场的水平...  相似文献   

一次雹灾天气过程的三体散射研究          下载免费PDF全文

许晶  孔文甲  周志花  郑玉峰  张连霞  赵海波  张璐  霍志丽  訾倩倩  韩仲强  王志春 《沙漠与绿洲气象(新疆气象)》2022,16(4):57-63

利用自动气象站资料、CINRAD/CD多普勒雷达资料、实地冰雹调查资料及NCEP/NCAR再分析资料，分析2020年一次呼和浩特市托克托县地区强冰雹事件发生时出现的三体散射与风暴云团三维结构、发展特征，结果表明：（1）C波段雷达较S波段雷达容易出现三体散射。（2）三体散射现象和55 dBZ或60 dBZ等强回波密切相关，尤其是60 dBZ强回波出现时，三体散射现象也随之出现。（3）从三体散射与冰雹云体积变化情况来看，60 dBZ冰雹云体积即使在50 km3以下也会出现三体散射。（4）在本个例中发现多重三体散射，其特征是在雷达径向上三体散射长度较长，为强回波距地高度的3~5倍，随着多重散射次数的增加，散射越来越弱，故多重三体散射强度沿着强回波径向上逐渐减弱。（5）三体散射现象首次出现后，开始出现冰雹,下沉气流使冰雹云回波顶高迅速下落，其中60 dBZ回波顶高下落最为明显，垂直厚度减少最为严重。大冰雹降落后60 dBZ回波底高迅速抬升,体积急剧减小,之后风暴云团回波顶高、体积进入平稳阶段。  相似文献