A study on the characteristics of silt loading on paved roads in the Seoul metropolitan area using a mobile monitoring system

Abstract

This study is considered the first attempt to apply a mobile monitoring system to estimating silt loading on paved roads in a megacity such as the Seoul metropolitan area. Using a mobile monitoring system developed in 2005, we estimated silt loadings on representative paved roads in the Seoul metropolitan area, including the city of Incheon, over a period of 3 yr. The temporal and spatial characteristics of silt loading were investigated for the carefully selected roads that may reflect the characteristics of the cities of Seoul and Incheon. In this study, changes in the average silt loading values were investigated in terms of land use, the temporal resolution of data acquisition (i.e., seasonal, daily, three-hour scale), the road width or number of lanes, and rainfall, which may affect the characteristics of the average silt loading significantly. It was found that the advantages of using the mobile monitoring system are its ability to obtain a large quantity of silt loading data in a short period of time and over a wide area and its ability to create a silt loading map showing the relative magnitude of silt loading in relation to a specific location, which makes it possible to easily locate hot spots.Implications: This study may be considered the first practical application of a mobile monitoring system to obtain the silt loading data on paved roads in a mega-city such as Seoul. It was found that the advantages of using the mobile monitoring system are its ability to obtain a large quantity of silt loading data in a short period of time and over a wide area and its ability to create a silt loading map showing the relative magnitude of silt loading in relation to a specific location, which makes it possible to easily locate hot spots to be cleaned cost-effectively by city officials.

A Review of Road Traffic-Derived Non-Exhaust Particles: Emissions, Physicochemical Characteristics, Health Risks, and Mitigation Measures

“…On-road TRWP sampling and measurements on instrumented cars have adopted various approaches. 83 − 85 Studies based on the TRAKER method report that particles sampled behind the front wheel of a car have a size distribution peaking at about 2–3 μm, with a high content of crustal elements, indicating a high contribution from road wear and dust. 38 , 86 Beji et al, using electrical low pressure impactor devices, measured a bimodal size distribution (<0.03 μm and 0.05–0.30 μm by number; 0.1–0.6 μm and 1.0–15 μm by mass) when sampling from the front tire.…”

“…A broad size range (10 nm to 10 μm) of laboratory generated TRWP has been measured (Figure c,d), − with a unimodal mass distribution in the 1–7 μm range and number size distribution of 10–200 nm. On-road TRWP sampling and measurements on instrumented cars have adopted various approaches. − Studies based on the TRAKER method report that particles sampled behind the front wheel of a car have a size distribution peaking at about 2–3 μm, with a high content of crustal elements, indicating a high contribution from road wear and dust. , Beji et al, using electrical low pressure impactor devices, measured a bimodal size distribution (<0.03 μm and 0.05–0.30 μm by number; 0.1–0.6 μm and 1.0–15 μm by mass) when sampling from the front tire . Studded tires, used in cold climates to improve grip, generate ultrafine particles (<100 nm) (Figure c,d), that is speculated to originate from evaporation and subsequent condensation of softening oils in the rubber mix …”