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2013年3月20日三明市大范围冰雹过程分析 被引量:10
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作者 邝美清 蒋宗孝 +1 位作者 张家斌 沈永生 《广东气象》 2014年第5期36-40,共5页
利用常规观测资料、Micaps资料、三明市区域站加密资料以及多普勒雷达资料,对2013年3月20日三明市大范围冰雹大风过程进行诊断分析。结果表明:500hPa高空槽加深、南支槽东移、三层强劲西南急流、中低层的低涡切变及弱冷空气南下、地... 利用常规观测资料、Micaps资料、三明市区域站加密资料以及多普勒雷达资料,对2013年3月20日三明市大范围冰雹大风过程进行诊断分析。结果表明:500hPa高空槽加深、南支槽东移、三层强劲西南急流、中低层的低涡切变及弱冷空气南下、地面锋面低槽等是该次冰雹过程的主要影响系统。冰雹的发生需要较强的垂直温度梯度t850-500≥25℃,上干下湿,冰雹的0℃层高度约3.5~4.3km左右,一20℃层约在7.0~7.8km左右,低层比湿q≥10g/kg。地面气象要素的剧烈变化对强天气的发生具有一定的指示意义。850hPaθse高能舌向降雹区输送不稳定能量,低层水汽充沛,地面冷空气南下渗透触发了不稳定能量的释放使得中尺度对流天气发生发展。该次冰雹过程强度强、范围大,对流回波(飑线)呈带状自西而东影响三明市。 展开更多
关键词 天气学 冰雹 西南急流 锋面低槽 地面要素 地面浮力 三明市
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A Guide to the Influence of Ground Reaction on Ship Stability
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作者 Ahmed Helmy Abouelfadl Essam Eldin Youssef Abdelraouf 《Journal of Shipping and Ocean Engineering》 2017年第6期262-273,共12页
Grounded ship faces up exceptionally different stability forces unlike in her normal operating condition. This critical situation must be corrected as soon as can minimize hull stress, the risk of pollution and stabil... Grounded ship faces up exceptionally different stability forces unlike in her normal operating condition. This critical situation must be corrected as soon as can minimize hull stress, the risk of pollution and stability failure. Re-floating the ship need full understanding of the impact of ground reaction (R) on the ship buoyancy and stability. Re-floating the ship has different phases and there are several immediate actions that should be taken by ship's crew; one of these phases is re-calculation of ship stability conditions. In this paper, a guide to understanding the effect of the ground reaction (R), determines the amount of ground pressure and its location. With consideration of the seabed form whether symmetric of asymmetric. Calculating the magnitude of the ground reaction (R) using different applicable methods, explaining the effect of using weight to re-float the ship by her own means, focusing on GM calculation after grounding. 展开更多
关键词 Ship grounding ground reaction (R) ground pressure (P) neutral loading point and ship re-floating.
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