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撒贝尼演示武警官兵抗洪姿势
“V字型”阵列验证大浪冲击力
科学家张双南
中国网娱乐8月21日讯 每一次发生洪水险情,总能看到一排排武警官兵筑成人堤站在水中抢险的情景。上周日《加油!向未来》通过“世界最强造浪机”验证了洪水来临时自救的最科学方式,而这科学的最佳答案却与武警官兵救灾时的姿势大相径庭。科学家张双南的一番解释,揭开了抗洪战士选择最差自救方式的感人真相。节目播出之后,洪水实验短视频也在网络引大量网友转发热议:“哪有什么岁月静好,只是有人在替我们负重前行”。
“世界最强造浪机”现身节目 “|字”阵列获选自救最佳
今年夏天,南方暴雨导致湖南、广西等城市遭遇洪涝灾害。在发生洪水险情,如何选择科学的方式自救,成为当期《加油!向未来》一大重要科普议题。节目将实验室搬至交通运输部天津水运工程科学研究院,在目前世界上尺寸最大、造浪能力最强、功能最齐全的波浪水槽中模拟洪水来袭,验证哪一种站姿能够抵挡住波浪冲击,为观众呈现最科学的自救选项。
外景实验员路伦一首先单人体验了大浪冲击的力量,实验结果证明体重66千克的路伦一,完全无法凭一己之力抵挡高1.4米、时间周期为4秒的15个波浪冲击,整个人被大浪推离原点2米多远。结合多人组成不同阵列,是否能更科学地自救自保?7位实验员分别以“V字型”、“一字型”和“|字型”阵列再次实验。在造波条件不变的情况下,“V字型”和“一字型”组合极易被大浪冲垮,因为队列中的每个人都会受到大浪的冲击,只要其中一位实验员被冲倒,自救队形就会瞬间崩塌。唯有纵向“|字”阵型成功经受住了考验,源于纵列中只有最前排的人受到直接冲击,而后面队伍中的人既能支撑前方,又能受到前排的保护。因此,当遭遇台风、风暴潮、洪水大浪的情况时,选取纵向“|字”阵列,由前往后依次按身体素质从强到弱的顺序站定,是自保自救最科学方式。
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