The convective heat transfer coefficient(CHTC) of building exterior surface is an important parameter for energy-saving and urban environment simulation.

建筑外表面对流换热系数是建筑节能和城市环境模拟中的重要参数。

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An automatic accident detection method based on traffic flow parameters will be accessed, through simulating the physical environment of urban tunnel with traffic simulation software VISSIM.

采用VISSIM交通仿真软件，对城市隧道内的物理环境进行仿真，可设计出一种基于交通流参数的交通事故自动检测方法。

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