scholarly journals Mathematical interpretation of pollutant wash-off from urban road surfaces using simulated rainfall

2007 ◽  
Vol 41 (13) ◽  
pp. 3025-3031 ◽  
Author(s):  
Prasanna Egodawatta ◽  
Evan Thomas ◽  
Ashantha Goonetilleke
Keyword(s):  
Simulated Rainfall ◽  
Urban Road ◽  
Road Surfaces ◽  
Mathematical Interpretation

scholarly journals Adsorption of heavy metals by road deposited solids

2013 ◽  
Vol 67 (11) ◽  
pp. 2622-2629 ◽  
Author(s):  
Chandima Gunawardana ◽  
Ashantha Goonetilleke ◽  
Prasanna Egodawatta
Keyword(s):  
Heavy Metals ◽  
Kinetic Studies ◽  
Field Studies ◽  
Water Soluble ◽  
Trivalent Cation ◽  
Urban Road ◽  
High Charge Density ◽  
Road Surfaces ◽  
Adsorption Desorption ◽  
Exchangeable Form

The research study discussed in the paper investigated the adsorption/desorption behaviour of heavy metals commonly deposited on urban road surfaces, namely, Zn, Cu, Cr and Pb, for different particle size ranges of solids. The study outcomes, based on field studies and batch experiments, confirmed that road deposited solids particles contain a significantly high amount of vacant charge sites with the potential to adsorb additional heavy metals. Kinetic studies and adsorption experiments indicated that Cr is the most preferred metal element to associate with solids due to the relatively high electronegativity and high charge density of trivalent cation (Cr3+). However, the relatively low availability of Cr in the urban road environment could influence this behaviour. Comparing total adsorbed metals present in solids particles, it was found that Zn has the highest capacity for adsorption to solids. Desorption experiments confirmed that a low concentration of Cu, Cr and Pb in solids was present in water-soluble and exchangeable form, whilst a significant fraction of adsorbed Zn has a high likelihood of being released back into solution. Among heavy metals, Zn is considered to be the most commonly available metal among road surface pollutants.

scholarly journals Influence of pollutant build-up on variability in wash-off from urban road surfaces

2015 ◽  
Vol 527-528 ◽  
pp. 344-350 ◽  
Author(s):  
Buddhi Wijesiri ◽  
Prasanna Egodawatta ◽  
James McGree ◽  
Ashantha Goonetilleke
Keyword(s):  
Urban Road ◽  
Road Surfaces

scholarly journals Process variability of pollutant build-up on urban road surfaces

2015 ◽  
Vol 518-519 ◽  
pp. 434-440 ◽  
Author(s):  
Buddhi Wijesiri ◽  
Prasanna Egodawatta ◽  
James McGree ◽  
Ashantha Goonetilleke
Keyword(s):  
Process Variability ◽  
Urban Road ◽  
Road Surfaces

A Study on the Effects of Factors of Traffic Accidents Caused by Frozen Urban Road Surfaces in the Winter

2015 ◽  
Vol 17 (2) ◽  
pp. 79-87 ◽  
Author(s):  
Sangyoup Kim ◽  
◽  
Youngsoo Jang ◽  
Sungkyu Kim ◽  
Dongchan Min ◽  
...  
Keyword(s):  
Traffic Accidents ◽  
Urban Road ◽  
Road Surfaces

scholarly journals Analysis of build-up of heavy metals and volatile organics on urban roads in gold coast, Australia

2011 ◽  
Vol 63 (9) ◽  
pp. 2077-2085 ◽  
Author(s):  
Parvez Mahbub ◽  
Ashantha Goonetilleke ◽  
Godwin A. Ayoko ◽  
Prasanna Egodawatta ◽  
Tan Yigitcanlar
Keyword(s):  
Heavy Metals ◽  
Gold Coast ◽  
Particulate Fraction ◽  
Strong Correlations ◽  
Volatile Organics ◽  
Urban Road ◽  
Urban Water Quality ◽  
Road Surfaces ◽  
Volatile Organic ◽  
Volatile Organic Pollutants

Urban water quality can be significantly impaired by the build-up of pollutants such as heavy metals and volatile organics on urban road surfaces due to vehicular traffic. Any control strategy for the mitigation of traffic related build-up of heavy metals and volatile organic pollutants should be based on the knowledge of their build-up processes. In the study discussed in this paper, the outcomes of a detailed experimental investigation into build-up processes of heavy metals and volatile organics are presented. It was found that traffic parameters such as average daily traffic, volume over capacity ratio and surface texture depth had similar strong correlations with the build-up of heavy metals and volatile organics. Multicriteria decision analyses revealed that that the 1–74 μm particulate fraction of total suspended solids (TSS) could be regarded as a surrogate indicator for particulate heavy metals in build-up and this same fraction of total organic carbon could be regarded as a surrogate indicator for particulate volatile organics build-up. In terms of pollutants affinity, TSS was found to be the predominant parameter for particulate heavy metals build-up and total dissolved solids was found to be the predominant parameter for the potential dissolved particulate fraction in heavy metals buildup. It was also found that land use did not play a significant role in the build-up of traffic generated heavy metals and volatile organics.

Mathematical relationships for metal build-up on urban road surfaces based on traffic and land use characteristics

Chemosphere ◽  
2014 ◽  
Vol 99 ◽  
pp. 267-271 ◽  
Author(s):  
Janaka Gunawardena ◽  
Abdul M. Ziyath ◽  
Prasanna Egodawatta ◽  
Godwin A. Ayoko ◽  
Ashantha Goonetilleke
Keyword(s):  
Land Use ◽  
Urban Road ◽  
Road Surfaces ◽  
Mathematical Relationships

scholarly journals Understanding road surface pollutant wash-off and underlying physical processes using simulated rainfall

2008 ◽  
Vol 57 (8) ◽  
pp. 1241-1246 ◽  
Author(s):  
Prasanna Egodawatta ◽  
Ashantha Goonetilleke
Keyword(s):  
Current Knowledge ◽  
Road Surface ◽  
Detailed Knowledge ◽  
Simulated Rainfall ◽  
Design Strategies ◽  
Urban Stormwater ◽  
Physical Constraints ◽  
Study Results ◽  
Road Surfaces ◽  
Pollutant Source

Pollutant wash-off is one of the key pollutant processes that detailed knowledge is required in order to develop successful treatment design strategies for urban stormwater. Unfortunately, current knowledge relating to pollutant wash-off is limited. This paper presents the outcomes of a detailed investigation into pollutant wash-off on residential road surfaces. The investigations consisted of research methodologies formulated to overcome the physical constraints due to the heterogeneity of urban paved surfaces and the dependency on naturally occurring rainfall. This entailed the use of small road surface plots and artificially simulated rainfall. Road surfaces were selected due to its critical importance as an urban stormwater pollutant source. The study results showed that the influence of initially available pollutants on the wash-off process was limited. Furthermore, pollutant wash-off from road surfaces can be replicated using an exponential equation. However, the typical version of the exponential wash-off equation needs to be modified by introducing a non dimensional factor referred to as ‘capacity factor' CF. Three rainfall intensity ranges were identified where the variation of CF can be defined. Furthermore, it was found that particulate density rather than size is the critical parameter that influences the process of pollutant wash-off.

scholarly journals Relationships between rainfall intensity, duration and suspended particle washoff from an urban road surface

2011 ◽  
Vol 42 (4) ◽  
pp. 239-249 ◽  
Author(s):  
Ian M. Brodie ◽  
Prasanna Egodawatta
Keyword(s):  
Rainfall Intensity ◽  
Suspended Particle ◽  
Measured Data ◽  
Storm Event ◽  
Storm Events ◽  
Constant Intensity ◽  
Urban Road ◽  
Road Surfaces ◽  
Basic Understanding ◽  
Average Rainfall

A basic understanding of the relationships between rainfall intensity, duration of rainfall and the amount of suspended particles in stormwater runoff generated from road surfaces has been gained mainly from past washoff experiments using rainfall simulators. Simulated rainfall was generally applied at constant intensities, whereas rainfall temporal patterns during actual storms are typically highly variable. This paper discusses a rationale for the application of the constant-intensity washoff concepts to actual storm event runoff. The rationale is tested using suspended particle load data collected at a road site located in Toowoomba, Australia. Agreement between the washoff concepts and measured data is most consistent for intermediate-duration storms (duration <5 h and >1 h). Particle loads resulting from these storm events increase linearly with average rainfall intensity. Above a threshold intensity, there is evidence to suggest a constant or plateau particle load is reached. The inclusion of a peak discharge factor (maximum 6 min rainfall intensity) enhances the ability to predict particle loads.

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