Simulation Analysis on A Rainstorm in Guizhou and Numerical Test about the Terrain Impact

A rainstorm caused by mesoscale convective system (MCS) in Guizhou Province in June 25-26 in 2005 was simulated with the MM5 model. Based on the good simulated results of the MCS developing and the clouds physics process, and by means of reducing the height of Yunnan-Guizhou Plateau and cutting off the middle-east of the Yunnan-Guizhou Plateau on the simulated tests, the question as how the ladder terrain on the west of Yunnan-Guizhou Plateau impact on the rainstorm of Guizhou was studied. The analysis results showed that the second ladder terrain of Yunnan-Guizhou Plateau only affected the development of convective clouds on its backward position,and hardly affected the rain on its upward. The whole terrain of the Yunnan-Guizhou Plateau had a distinct impact not only on the windward slope rainfall of the west of the plateau, but also on the rainfall distribution, intensity and continuing time of the convective clouds on the middle-east of the plateau.

局限地形下不停电作业平台的研制

不停电作业是以实现客户不停电或短时停电为目的,采用多种作业方式对配网设备进行检修的作业。随着城市配电网建设的推进,越来越多的不停电作业场景转向老旧胡同、农田、山区以及变电站出线等局限环境。然而现有不停电作业存在时间长、成本大、作业空间小、需要人员多等难点,文章通过借鉴移动式脚手架对现有不停电作业平台进行改进设计,提出了平台的总体设计思路和各功能模块的设计思路,设计研制了适用于局限地形下的不停电作业平台,并展示了应用成效。

基于粘弹性人工边界的阶梯地形地震波动问题分析

针对阶梯地形地震波动问题,在粘弹性人工边界理论的基础上提出了1种新的"虚拟对称子结构体系"地震动输入技术。该技术不仅有效实现了对阶梯地形的波动输入,也解决了高差引起的输入地震荷载不一致问题。基于商业有限元软件对某典型算例进行动力时程数值分析,结果表明:所述方法具有较高的精确度和实用性;临空面位移幅值表现出显著的放大效应,且斜坡坡度越大,动力放大效应越明显。

贵州暴雨模拟分析及地形影响数值试验

利用中尺度数值预报模式MM5,对贵州省2005年6月25～26日一次由中尺度对流系统(MCS)引起的暴雨过程进行数值模拟,并在MM5很好地模拟了此次MCS过程及伴随的云物理过程基础上,通过分别降低云贵高原的地势及削平云贵高原中东部以东地区模拟试验,研究了云贵高原西部阶梯型地形对贵州地区暴雨的影响。结果表明,云贵高原的第2阶梯地形仅对该地形下游地区对流云系的发展有影响,对上游地区降水影响不大,而云贵高原对高原西侧迎风坡降水有显著影响,对高原中东部地区暴雨的分布、强度和对流云系的持续时间有重要影响。