01622555

Component

https://doi.org/10.3141/2641-14

Decomposition and transformation algorithms are important tools in data analyses, including air pollution data processing, which has been a principal environmental concern for many decades. One of the main sources of air pollution is vehicular emissions, which contain harmful greenhouse gases. In addition to such factors as speed and acceleration affecting the quantity of emissions and fuel consumption, pavement roughness is an indirect factor. The portable emissions measurement system (PEMS) is used to collect on-road emissions data every second, and smartphone apps such as Roadroid are used to estimate road roughness. These data can be combined and correlated with vehicular activities such as speed, acceleration, and vehicle specific power and analyzed in detail to reveal the actual impact of roughness on emissions. However, analytical modeling can provide only an average estimation and does not retain local roughness and how it affects emissions. Such detailed information is necessary for pavement diagnosis and maintenance and emissions control. This paper presents a discrete wavelet transform (DWT) procedure that can offer local and supplementary relationships between pavement roughness and emissions that other simplified techniques cannot. PEMS data of four road segments in greater Houston, Texas, were considered to be decomposed by one-dimensional DWT for analysis of the wavelet subbands and their energies. The results of this study can be used in planning to minimize emissions with consideration for pavement conditions.

01634655

17-01471

English

pp 111–125

2017

Transportation Research Record: Journal of the Transportation Research Board

9780309441995

Digital/other

Figures (12) ; References (13)

Exhaust gases; Integral transforms; Roughness; Surface course (Pavements); Wavelets

Houston (Texas)

Environment; Highways; Pavements

TRIS, TRB, ATRI

Dec 8 2016 10:29AM

• Application of the Texas Department of Transportation Continuous Deflection Device to Select Rehabilitation Strategies for Concrete Pavements
• Assessment of Using Inertial Profilers to Measure Ride Quality on Short Projects
• Backcalculation of Flexible Pavement Layer Moduli from Traffic Speed Deflectometer Data
• Characterization of Permanent Deformation Behavior of Silty Sand Subgrade Soil Under Repeated Load Triaxial Tests
• Determination of an Optimum Backcalculation Cross Section for Unconventional Pavement Profiles
• Development of a Mean Profile Depth to Mean Texture Depth Shift Factor for Asphalt Pavements
• Dynamic Backcalculation of Viscoelastic Asphalt Properties and Master Curve Construction
• Evaluation of Moduli and Structural Coefficients of South Carolina’s Asphalt Base Mixtures
• Finite Element Framework for the Computation of Runway Friction of Aircraft Tires
• Finite Element Modeling of Permanent Deformation in the Loaded Wheel Tracker Test
• Implementation of the Structural Condition Index into the Louisiana Pavement Management System Based on Rolling Wheel Deflectometer Testing
• Implementation of the Thin Bonded Concrete Overlay of Existing Asphalt Pavement Design Procedure in the AASHTOWare Pavement ME Design Software
• Nondestructive In Situ Characterization of Elastic Moduli of Full-Depth Reclamation Base Mixtures
• Novel Macro- and Microtexture Indicators for Pavement Friction by Using High-Resolution Three-Dimensional Surface Data
• Research on Comfort and Safety Threshold of Pavement Roughness
• Simulation of Lightweight Deflectometer Measurements Considering Nonlinear Behavior of Geomaterials
• Study of Influence of Operating Parameters on Braking Distance
• Temperature Adjustment for Light Weight Deflectometer Application of Evaluating Asphalt Pavement Structural Bearing Capacity