Assessing the hydrological behaviour of large-scale potential green roofs retrofitting scenarios in Beijing

Zhou, Demin; Liu, Yinxue; Hu, Shanshan; Hu, Deyong; Neto, Susana; Zhang, Yue

doi:10.1016/j.ufug.2017.12.010

Cited by 28 publications

(19 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The delineation of the catchments was carried out by combining multi-source data: the 1:10,000 Digital Elevation Model (DEM), the urban drainage pipelines data, sewage outlets, and water dams locations [41]. In this paper, the study area was divided into 77 catchments for surface runoff simulation.…”

Section: Data Sourcesmentioning

confidence: 99%

Assessing the Effect of Land Use Change on Surface Runoff in a Rapidly Urbanized City: A Case Study of the Central Area of Beijing

Yun-yun

Zhang

2020

Land

Self Cite

View full text Add to dashboard Cite

The change in land use during the process of urbanization affects surface runoff and increases flood risk in big cities. This study investigated the impact of land use change on surface runoff in Beijing’s central area during the period of rapid urbanization from 1984 to 2019. Land use maps of 1984, 1999, 2009, and 2019 were generated by image classification of Landsat images. Surface runoffs were calculated with the Soil Conservation Service curve number (SCS-CN) model. Correlation analysis was used to identify the dominant factor of land use change affecting surface runoff. The result showed that the variation trend of surface runoff was consistent with the trend of impervious land in Beijing’s central area, which increased during 1984~2009 and decreased during 2009~2019. Correlation analysis showed that changes in surface runoff were most strongly correlated with changes in impervious surfaces when compared with the correlation of runoff with other types of land use. The results of this study may provide a reference for city flood control and urban planning in fast growing cities worldwide, especially in developing countries.

show abstract

Section: Data Sourcesmentioning

confidence: 99%

Assessing the Effect of Land Use Change on Surface Runoff in a Rapidly Urbanized City: A Case Study of the Central Area of Beijing

Yun-yun

Zhang

2020

Land

Self Cite

View full text Add to dashboard Cite

show abstract

“…A green building with possibly watered green roofs and greenery on the façades can have an effect of the same magnitude and encourage "climate neutrality". Zhou et al [12] calculated that if only 20% of a city's potential roofs were green, 13 of the 20 inundated underpasses could remain without flooding. Francis and Jensen [13] summarized the urban planning and quantifiable advantages of EGR from various literature sources as follows: Green roofs have a cooling effect on the street level.…”

Section: Introductionmentioning

confidence: 99%

Increasing Evapotranspiration on Extensive Green Roofs by Changing Substrate Depths, Construction, and Additional Irrigation

et al. 2019

View full text Add to dashboard Cite

Urban environments are characterized by dense development and paved ground with reduced evapotranspiration rates. These areas store sensible and latent heat, providing the base for typical urban heat island effects. Green roof installations are one possible strategy to reintroduce evaporative surfaces into cities. If green roofs are irrigated, they can contribute to urban water management and evapotranspiration can be enhanced. As part of two research projects, lysimeter measurements were used to determine the real evapotranspiration rates on the research roof of the University of Applied Sciences in Neubrandenburg, Germany. In this paper, we address the results from 2017, a humid and cool summer, and 2018, a century summer with the highest temperatures and dryness over a long period of time, measured in Northeast Germany. The lysimeter measurements varied between the normal green roof layer (variation of extensive green roof constructions) and a special construction with an extra retention layer and damming. The results show that the average daily evapotranspiration rates can be enhanced from 3 to 5 L/m2/day under optimized conditions. A second test on a real green roof with irrigation was used to explain the cooling effects of the surface above a café building in Berlin.

show abstract

“…However, it is fundamental to evaluate the mitigation capacity of these tools over an entire city or large neighbourhood in order to identify the most suitable solution, depending on the study area characteristics. Only a few works have investigated the effects of potential installation at medium city-scale of either GRs [ 33 , 34 ], or RWH [ 35 ] systems, and none of them have considered the impact of combined solutions. In this work, we analyse the mitigation efficiency in terms of runoff generation reduction and runoff peak delay, achievable thanks to a large-scale installation of GRs and RWH systems on the entire urban areas.…”

Section: Introductionmentioning

confidence: 99%

Comparison of blue-green solutions for urban flood mitigation: A multi-city large-scale analysis

et al. 2021

View full text Add to dashboard Cite

Flooding risk in cities has been recently exacerbated by increased urbanization and climate change, often with catastrophic consequences in terms of casualties and economic losses. Rainwater harvesting systems and green roofs are recognized as being among the most effective blue-green mitigation measures. However, performances of these systems have currently been investigated only at laboratory or very-small local scales. In this work, we assess the potential benefit of the extensive installation of these solutions on all the rooftops of 9 cities, with different climatological and geographical characteristics. Both surface discharge reduction and delay between rainfall and runoff peak generation have been investigated. Green roofs ensure a larger average lag time between rainfall and runoff peaks than rainwater harvesting systems, without significant differences between intensive and extensive structures. On the other hand, the cost-efficiency analysis, considering the entire urban area, shows a higher retention capacity with a lower financial investment for rainwater harvesting rather than for green roofs in most cases. For extreme rainfall events, large-scale installation of rainwater harvesting systems coupled with intensive green roofs over the entire city have shown to be the most efficient solution, with a total discharge reduction that can vary from 5% to 15%, depending on the city characteristics and local climate.

show abstract

Assessing the hydrological behaviour of large-scale potential green roofs retrofitting scenarios in Beijing

Cited by 28 publications

References 33 publications

Assessing the Effect of Land Use Change on Surface Runoff in a Rapidly Urbanized City: A Case Study of the Central Area of Beijing

Assessing the Effect of Land Use Change on Surface Runoff in a Rapidly Urbanized City: A Case Study of the Central Area of Beijing

Increasing Evapotranspiration on Extensive Green Roofs by Changing Substrate Depths, Construction, and Additional Irrigation

Comparison of blue-green solutions for urban flood mitigation: A multi-city large-scale analysis

Contact Info

Product

Resources

About