Identification of sensitivity indicators of urban rainstorm flood disasters: A case study in China

Wu, Manman; Wu, Zening; Ge, Wei; Wang, Shuangfeng; Shen, Yanxia; Jiang, Mengmeng

doi:10.1016/j.jhydrol.2021.126393

Cited by 73 publications

(38 citation statements)

References 45 publications

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“…Based on an empirical study of four mega-cities in China Wu et al (2021) proposed a descriptive framework for cities and communities to identify sensitivity indicators of urban rainstorm flood disasters by using a random forest model. Their results indicate that that urban rainstorm flood disasters are the most sensitive to surface water resources, and are the least sensitive to relief degree of land surface.A multi-criteria decision analysis framework for optimal decision making is developed by Velautham Daksiya, Mandapaka, and Lo (2021) to adapt climate change and associated uncertainties of urban flood risk.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Li and Sivapalan 2020). Especially, urban rainstorm floods have already been one of the most severe natural disasters that restrict the healthy development of the economy and society in China (Wu et al 2021). According to the Ministry of Water Resources of the People's Republic of China, more than 100 cities in China suffered from urban floods every year from 2008 to 2018, causing direct economic losses of 374.5, 267.5, 315.6, and 364.3 billion yuan in 2010, 2012, 2013, and 2016, respectively Velautham Daksiya, Mandapaka, and Lo (2021) found that climate change has a higher impact compared to urbanization on the flood protection decisions.…”

Section: Introductionmentioning

confidence: 99%

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Flash Floods Exposure Assessment Model for DRR Oriented Adaptive Planning in High-density Urban Areas

Zou¹,

Su²

2021

Proceedings of the 57th ISOCARP World Planning Congress

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Rapid urbanization in China is placing increased pressure on urban drainage infrastructure. Northeast coastal cities are susceptible to flood damage from typhoons and climate change is expected to produce more extreme weather events. Urban planners and local governments need better risk assessment tools to plan for future extreme events. An open data based exposure assessment model has been developed for disaster risk reduction (DRR) oriented adaptive urban plan making based on the understanding of flash floods risk in high-density urban areas under future climate scenarios. The proposed model is based on hydrological simulation, which accuracy is sensitive to the precision of input digital elevation model (DEM). A regression kriging based geointerpolation method is employed to reshape ground surface by increasing precision of global coverage ASTER GDEM from 30m to 10m. Time component is introduced to the Horton's water permeation model. The parameter of permeation speed limitation is critical to this model; initial values are taken from published Land Classification Codes and adjusted according to the field surveys and observation records. Shekou community in Shenzhen is a case study to verify the proposed model. Two most common scenarios are tested. One is a storm at low-tide condition, with a fully functional urban drainage system. This scenario is simulated by using historical rainfall data from Meteorological Bureau. The other scenario is a typhoon occurring at high-tide, which means urban drainage system is partially malfunctioned. The simulation results show high agreement with both the historical record and satellite observations. Based on the understanding of flash floods exposure assessment and the temporal-spatial distribution of the risk, DRR oriented adaptive urban plans can be made.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flash Floods Exposure Assessment Model for DRR Oriented Adaptive Planning in High-density Urban Areas

Zou¹,

Su²

2021

Proceedings of the 57th ISOCARP World Planning Congress

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“…During the prolonged wet season, waterlogging and flooding risks are high as the drainage network gets overloaded (Figure 1a). Unfortunately, two thirds of China's land is at risk of flooding, and 62% of Chinese cities have experienced urban rainstorm waterlogging disasters in recent years [13], causing direct economic loss averaging 330 billion RMB per year between 2011 and 2016 [14]. Thus, urban waterlogging is a crucial problem that limits the sustainable and healthy development of Chinese cities and megacities [15].…”

Section: Introductionmentioning

confidence: 99%

The Role of Aquifers in Sustaining the Sponge City Concept in Chinese High-Density Housing

Jin

Lancia

Tian

et al. 2022

Water

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Chinese cities and megacities occupy large areas with high population densities. These urban sectors have extensive impervious surfaces and import large amounts of water from pristine sources, putting pressure on the urban drainage systems during storms. To reduce flood risk and tackle water scarcity, the Chinese government promulgated the Sponge City concept: an ensemble of absorbing features, including permeable pavements and green roofs, to reduce urban runoff and increase water storage. We evaluate the benefits of merging the urban aquifer with conventional Sponge City features by simulating stormwater storage in aquifers with a groundwater model (MODFLOW) and a stormwater management model (SWMM). The urban aquifers of an ideal district, characterized by high-density housing and a flat morphology, collect and dissipate extreme rains (200 mm in 6 h) when the hydraulic conductivity of the subsoil is higher than 1·10−5 m/s, roughly corresponding to a medium productive aquifer. Economic and ecological benefits at the catchment scale are also discussed. Suitable shallow aquifers are individuated and discussed throughout China via a hydrogeological and geomorphological approach. The proposed method increases the percentage of water that can be controlled above that obtained through conventional Sponge City features.

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“…The municipal infrastructure needs to update with appropriate flood management (Wang et al, 2008;Zhang et al, 2019), and since the capability of the sewerage system in the Zhengzhou metropolitan region is insufficient, further improvements are required. Wang et al (2021) utilized remoting sense images with high precision (Sidek et al, 2021) coupled with urban hydrological models (Chen et al, 2021) to evaluate the possibility of potential flood hazards, and Wu et al (2021) represented the correlation between social indicators (such as population) and direct economic losses. Furthermore, Lv, Meng, et al (2021) introduced the Flood Inundated Depth-Loss Rate Function (FILF), accompanied by images of land-use classification and the Digital Elevation Model (DEM) to estimate the losses caused by extreme precipitation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of drainage efficiency under extreme precipitation events based on numerical simulation

Wang

et al. 2022

Hydrological Processes

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The recent increase in extreme climatic phenomena has gradually attracted the attention of researchers regarding urban flooding. This paper used a hydrological model combined with the Computational Fluid Dynamics software to assess the drainage efficiency, predict the hydrological processes under different precipitation intensities and establish the relationship between rainfall intensity and inundation depth under extreme rainstorm events. The study proposed several thresholds such as specific rainfall intensities (that is, RI 95% and RI 50% ), drainage efficiency, and the limited flow rate of pipes. Based on 2021 July 20, 0:00 to 24:00 precipitation monitoring data from the "7.20 Zhengzhou Rainstorm Extreme Event," the relationship between rainfall intensity and road-pipe overflow patterns was determined by analysing these thresholds for different drainpipe diameters and spacings of catchment wells. The results demonstrated the evaluation parameters varied with rainfall intensities and pipe characteristics and revealed the main limitation of drainage efficiency and flow rate of drainpipes. The simulation helped the drainage systems design for different precipitations and proposed several relative suggestions for drainage-system improvements, wherein the diameter of the branch pipes plays a dominant role in coping with extreme rainstorm events.

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Identification of sensitivity indicators of urban rainstorm flood disasters: A case study in China

Cited by 73 publications

References 45 publications

Flash Floods Exposure Assessment Model for DRR Oriented Adaptive Planning in High-density Urban Areas

Flash Floods Exposure Assessment Model for DRR Oriented Adaptive Planning in High-density Urban Areas

The Role of Aquifers in Sustaining the Sponge City Concept in Chinese High-Density Housing

Analysis of drainage efficiency under extreme precipitation events based on numerical simulation

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