Reseach On Road Dust Detection And Emission Strength Accounting Research In Shijiazhuang City

In this thesis,typical roads were chosen as the research object in Shijiazhuang and the sampling method was mobile sampling method for road dust collecting.With the data of silt loading,dust particle size distribution,traffic flow and average vehicle weight,road dust(PM_2.5)emission factor and emission strength were calculated.And vector quantization of roads information was extracted through GIS softwares,road traffic dust emission inventory was accomplished in Shijiazhuang city.The main conclusions are as follows:1)The average of road silt loading was less than 0.12 g·m^-2 for four seasons.Road silt loading was 0.11 g·m^-2 in autumn,2014,0.03 g·m^-2 in winter,0.06 g·m^-2 in spring and0.04 g·m^-2 in summer.And the temproal distribution characteristic of silt loading was autumn>spring>winter>summer.The average silt loading of four road types?express way,trunk road,road and branch?was less than 0.10 g·m^-2.Road silt loading of expressway was 0.08 g·m^-2,trunk road was 0.03 g·m^-2,secondary trunkroad was 0.04g·m^-2 and branch road 0.05 g·m^-2.Therefore silt loading distribution characteristic of different types of road was expressway>branch road>secondary trunk road>trunk road.The average silt loading at each lane?fast lane,middle lane and slow lane?was less than0.08 g·m^-2 in Shijiazhuang.The silt loading of fast lane was 0.04 g·m^-2,middle lane was0.05 g·m^-2 and silt loading of slow lane was 0.08 g·m^-2.So silt loading distribution characteristic of different lane was slow lane>middle lane>fast lane.2)Through the research of road dust emission factor and emission inventory in Shijiazhuang city,typical road dust emission characteristics were obtained.Road dust emission factors were 0.003⁰.103 g·VKT^-1 in autumn,the maximum value appeared in Naner Huan Road,the minimum appeared in Donggang Road.While road dust emission factors were 0.004⁰.016 g·VKT^-1 in winter,the maximum value appeared in Huai'an road,the minimum value in Tanan Road.For these two seasons,roads dust emission factor characteristic was expressway>trunk road>secondary trunk road>branch.Road dust emission strengths were 6.47⁵3.07 t in autumn,while 3.47¹2.02 t in winter.Road dust emission characteristic was expressway>branch>trunk road>secondary trunk road.