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为研究高速公路纵坡路段的碳排放规律,以西安绕城高速为依托工程进行现场试验,采用MOVES进行碳排放模拟,并利用试验核算的碳排放数据评估模拟结果。基于MOVES模型得到我国高速公路不同纵坡情况下的碳排量数据库文件,建立高速公路纵坡路段的载重汽车的碳排放模型,并对碳排放模型进行敏感性分析。研究结果表明:高速公路纵坡路段的碳排放量以初速度、坡度、坡长为自变量作多元非线性函数形式的变化;高速公路上坡路段是机动车产生碳排放的主要路段,累计碳排量对坡度i_(上坡_∈[3%,6%]的敏感性居第一位次,对坡长l_(上坡)的敏感性居第二位次,反映出路线设计过程应尽量采用较小纵坡,避免长大纵坡的设计方案;在高速公路下坡路段,累计碳排放对坡度i_(下坡)∈[-3%,-6%]的变化最敏感,坡长次之。
In order to study the law of carbon emission along the longitudinal section of expressway, a field test based on the project of Xi’an Ring Expressway was carried out. The carbon emission simulation was carried out by using MOVES and the simulation results were evaluated by experimentally calculated carbon emission data. Based on the MOVES model, the carbon emission database of Chinese highway with different longitudinal slopes was obtained, and the carbon emission model of the truck was established and the sensitivity of carbon emission model was analyzed. The results show that the carbon emissions of the longitudinal section of expressway take the form of multivariate nonlinear function with initial velocity, gradient and length of slope as the independent variable. The uphill section of expressway is the main section of automobile that produces carbon emissions, The sensitivity to slope i_ (uphill ∈ [3%, 6%]) is the highest, and the sensitivity to slope l_ (uphill) is the second highest, which indicates that the route design process should be used as much as possible The smaller longitudinal slope avoids the design of growing longitudinal slope. In the downhill section of the expressway, the accumulated carbon emission is the most sensitive to the change of gradient i_ (downhill) ∈ [-3%, -6%], followed by the slope length.