Urban stormwater runoff thermal characteristics and mitigation effect of low impact development measures

2018 ◽  
Vol 10 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Junqi Li ◽  
Yongwei Gong ◽  
Xiaojing Li ◽  
Dingkun Yin ◽  
Honghong Shi
Keyword(s):  
Retention Volume ◽  
Low Impact Development ◽  
Stormwater Runoff ◽  
Thermal Characteristics ◽  
Weather Conditions ◽  
Vegetative Cover ◽  
Urban Stormwater ◽  
Open Graded Friction Course ◽  
Urban Stormwater Runoff ◽  
Land Surfaces

Abstract Thermal pollution has become a severe environmental problem in China, but studies on thermal characteristics of urban stormwater runoff are scarce. The thermal enrichment of runoff from typical land surfaces was assessed during 2012–2014 in Beijing and Shenzhen, China. The temperature of stormwater runoff from rooftops, grass surfaces and different types of road surfaces was investigated under different rainfall conditions. The mitigation effects of low impact development (LID) measures were also evaluated. Impervious asphalt or concrete surfaces store and transfer heat, and were found to cause thermal enrichment of runoff from the start of a rainfall event. In addition to surface types, pre-event weather conditions and rainfall intensity influenced runoff temperature. The pervious surface of open graded friction course (OGFC) pavement postponed the time of peak runoff temperature. The retention volume of bioretention cells resulted in thermal energy mitigation by directing runoff into the soil and vegetative cover. The grass swales showed effective reduction of runoff temperature by approximately 1–2°C compared to asphalt, concrete and marble pavements. Therefore, LID measures, such as OGFC porous pavements, bioretention cells and grass swales, can mitigate the thermal impacts of urban stormwater runoff and alleviate resulting ecological problems.

scholarly journals A Review of Green Roof Applications for Managing Urban Stormwater in Different Climatic Zones

2018 ◽  
Vol 10 (8) ◽  
pp. 2864 ◽  
Author(s):  
Musa Akther ◽  
Jianxun He ◽  
Angus Chu ◽  
Jian Huang ◽  
Bert van Duin
Keyword(s):  
Review Paper ◽  
Low Impact Development ◽  
Green Roof ◽  
Stormwater Runoff ◽  
Green Roofs ◽  
Influential Factors ◽  
Urban Stormwater ◽  
Climatic Zones ◽  
Typical Type ◽  
Urban Stormwater Runoff

Many regions have turned to low impact development technologies (LIDs), which are implemented to restore the changes in stormwater runoff that have resulted from urbanization. Green roofs are one typical type of LID. Until now, many studies have validated their roles in managing urban stormwater runoff. However, they have also revealed that the performance of green roofs largely varies with their design configuration, as well as their hydro-climatic exposure. The objectives of this review paper are to statistically synthesize the effects of the influential factors, including design and hydrologic variables, on green roof performance and to explore their effects in different climatic zones. The review’s results confirm the differences in the influential variables and, thus, the performance of green roofs in different climatic zones. These are the barriers to knowledge translation among engineering designers, stormwater managers, and policymakers in different climatic zones when implementing green roofs. Consequently, region- or site-specific studies are necessary to implement green roofs with confidence.

Spatial and Temporal Distribution of Heavy Metals Concentration in Urban Stormwater Runoff

2013 ◽  
Vol 726-731 ◽  
pp. 1801-1804 ◽  
Author(s):  
Shu Min Wang ◽  
Hui Yu
Keyword(s):  
Heavy Metal ◽  
Stormwater Runoff ◽  
Temporal Distribution ◽  
Urban Region ◽  
Spatial And Temporal Distribution ◽  
Urban Stormwater ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Urban Stormwater Runoff ◽  
Cu And Zn

In order to know the characteristic of spatial and temporal distribution of heavy metal concentrations in urban stormwater runoff, rainfall runoff from impervious underlying surfaces in urban region was observed during rain events. Results showed that during the precipitation process, heavy metal concentrations decreased gradually temporally (except Cd); concentrations of Fe, Cu and Zn meet Class III standard of Environmental Quality Standards for Surface Water in terminal runoff, but concentrations of Cd and Pb go beyond this standard far. Heavy metal concentrations in runoff from different types of landuses were significantly different. The arithmetic average concentrations of Fe, Cd, Cu and Zn in stormwater runoff from roof (e.g.,34.4mg/L, 0.15mg/L, 1.25mg/L and 1.23mg/L, respectively) were obviously higher than that in stormwater runoff from road (e.g., 11.8mg/L, 0.05mg/L, 0.13mg/L and 0.69mg/L, respectively).

Using Multiple Isotopes to Identify Sources and Transports of Nitrate in Urban Residential Stormwater Runoff

2021 ◽  
Author(s):  
Qiyue Hu ◽  
Song Zhu ◽  
Zanfang Jin ◽  
Aijing Wu ◽  
Xiaoyu Chen ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
Aquatic Ecosystems ◽  
Stormwater Runoff ◽  
Organic N ◽  
Road Runoff ◽  
Urban Stormwater ◽  
Roof Runoff ◽  
The Road ◽  
Urban Stormwater Runoff ◽  
Siar Model

Abstract Increased nitrogen (N) from urban stormwater runoff aggravates the deterioration of aquatic ecosystems as urbanisation develops. In this study, the sources and transport of nitrate (NO3−) in urban stormwater runoff were investigated by analysing different forms of N, water isotopes (δD-H2O and δ18O-H2O), and NO3− isotopes (δ15N-NO3− and δ18O-NO3−) in urban stormwater runoff in a residential area in Hangzhou, China. The results showed that the concentrations of total N and nitrate N in road runoff were higher than those in roof runoff. Moreover, high concentrations of dissolved organic N and particulate N in road runoff led to significantly different TN concentrations in road runoff (mean: 3.76 mg/L) and roof runoff (mean: 1.23 mg/L). The high δ18O-NO3− values (mean: 60 ± 13.1‰) indicated that atmospheric deposition was the predominant NO3− source in roof runoff, as confirmed by the Bayesian isotope mixing model (SIAR model), contributing 83.6–97.8% to NO3−. The SIAR model results demonstrated that atmospheric deposition (34.2–91.9%) and chemical fertilisers (6.27–54.3%) were the main NO3− sources for the road runoff. The proportional contributions from soil and organic N were smaller than other sources in both the road runoff and roof runoff. For the initial period, the NO3− contributions from atmospheric deposition and chemical fertilisers were higher and lower, respectively, than those in the middle and late periods in road runoff during storm events 3 and 4, while an opposite trend of road runoff in storm event 7 highlighted the influence of short antecedent dry weather period. It was suggested that reducing impervious areas and more effective management of fertiliser application in urban green land areas were essential to minimize the presence of N in urban aquatic ecosystems.

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