A physically-based model for dissolved pollutant transport over impervious surfaces

Zhang, Taotao; Xiao, Yang; Liang, Dongfang; Tang, Hongwu; Xu, Junzeng; Yuan, Saiyu; Luan, Bin

doi:10.1016/j.jhydrol.2020.125478

Cited by 12 publications

(32 citation statements)

References 36 publications

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“…When compared to L, H C , and n, the influence of S 0 on P T , P R , and P C was insignificant, particularly P C . Additionally, H C decreased with increasing S 0 , as noted by Zhang, Xiao, Liang, Tang, Xu, et al (2020).…”

Section: Factors Influencing Pollutant Transportmentioning

confidence: 74%

“…According to Zhang, Xiao, Liang, Tang, Xu, et al (2020), a shorter area length leads to faster pollutant transport. Although the pollutant transport rate on a long area is high, a longer time is required to reduce the pollutant concentration to zero as the initial pollutant mass on the surface is larger.…”

Section: Factors Influencing Pollutant Transportmentioning

confidence: 99%

“…As mentioned above, the 'control layer' concept proposed by Zhang, Xiao, Liang, Tang, Xu, et al (2020) is adopted in this study. As Zhang, Xiao, Liang, Tang, Xu, et al (2020) suggested, a 'control layer' with a certain depth will be formed due to the surface tension and bottom friction before overland flow occurs, into which the pollutant begins to dissolve. After overland flow commences, the pollutants in the control layer gradually transfer to the upper runoff layer and then flow out of the area, as shown in Figure 1.…”

Section: Pollutant Transport Equationmentioning

confidence: 99%

“…After overland flow commences, the pollutants in the control layer gradually transfer to the upper runoff layer and then flow out of the area, as shown in Figure 1. According to Zhang, Xiao, Liang, Tang, Xu, et al (2020), the control layer is assumed to be stationary and make no contribution to the runoff rate in the outlet. The depth of the control layer keeps constant in a rainfall event and is mainly correlated with the bed slope.…”

Section: Pollutant Transport Equationmentioning

confidence: 99%

“…This transport model assumes that the dissolved pollutants in the upper runoff water are completely mixed with those in the underlying control layer. They conducted a series of simplified laboratory experiments to validate the presented transport model (Zhang, Xiao, Liang, Tang, Xu, et al, 2020). It showed that the depth of the control layer has a limiting minimum value with increasing bed slope.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A two‐layer model for studying 2D dissolved pollutant runoff over impermeable surfaces

Zhang

Xiao

Liang

et al. 2021

Hydrological Processes

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Dissolved pollutants in stormwater are a main contributor to water pollution in urban environments. However, many existing transport models are semi-empirical and only consider one-dimensional flows, which limit their predictive capacity. Combining the shallow water and the advection-diffusion equations, a two-dimensional physically based model is developed for dissolved pollutant transport by adopting the concept of a 'control layer'. A series of laboratory experiments has been conducted to validate the proposed model, taking into account the effects of buildings and intermittent rainfalls. The predictions are found to be in good agreement with experimental observations, which supports the assumption that the depth of the control layer is constant. Based on the validated model, a parametric study is conducted, focusing on the characteristics of the pollutant distribution and transport rate over the depth.The hyetograph, including the intensity, duration and intermittency, of rainfall event has a significant influence on the pollutant transport rates. The depth of the control layer, rainfall intensity, surface roughness and area length are dominant factors that affect the dissolved pollutant transport. Finally, several perspectives of the new pollutant transport model are discussed. This study contributes to an in-depth understanding of the dissolved pollutant transport processes on impermeable surfaces and urban stormwater management.

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Section: Factors Influencing Pollutant Transportmentioning

confidence: 74%

Section: Factors Influencing Pollutant Transportmentioning

confidence: 99%