Urban flood risk warning under rapid urbanization

Chen, Yangbo; Zhou, Haolan; Zhang, Hui; Du, Guoming; Zhou, Jinhui

doi:10.1016/j.envres.2015.02.028

Cited by 230 publications

(127 citation statements)

References 8 publications

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“…Compared with other researches, the mean and trend of precipitation, extreme precipitation events, and extreme drought events in this study are generally similar whereas the climate indicators are not absolutely identical. For example, using Standardized Precipitation Evapotranspiration Index based on Penman (SPEI‐PM) representative evapotranspiration formula, Y. Chen, Zhou, Zhang, Du, and Zhou () found that the climate in the vicinity of the Hu‐Huanyong Line has a trend of drought, and there is a wetting trend on both sides of the line, especially in Xinjiang and Qinghai. The results of Wu's research showed an obvious pattern in the climate risk regression map (based on the comprehensive aridity index) that the northwest region has a high risk of drought and the southeast region has a high risk of waterlogging, whereas the area near the Hu‐Huanyong Line is mostly mild climate (Wu et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Research results in other subregions, such as in Songhua River Basin (Song et al, ), Pearl River Basin (Zhao et al, ), Hengduan Mountains region (K. Zhang et al, ), Yangtze River Basin (T. Gao & Xie, ), coastal area of China (X. Wang et al, ), Xinjiang (J. Yao, Zhao, Chen, Yu, & Zhang, ), also had similar conclusions with this study. Different from common urban flooding risk zoning research (Y. Chen et al, ; Yin, Yu, Yin, Liu, & He, ), this study explored the risk or possibility of flood or drought in Chinese cities in the background of climate change, using cluster analysis to divide the cities according to the characteristics of the conventional and extreme climate events of cities in the future, and analysed the specific types of urban drought and flood risk.…”

Section: Discussionmentioning

confidence: 99%

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Assessing urban flood and drought risks under climate change, China

Chen

Yuan

et al. 2019

Hydrological Processes

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Risk analysis of urban flood and drought can provide useful guidance for urban rainwater management. Based on an analysis of urban climate characteristics in 2,264 Chinese cities from 1958 to 2017, this study evaluated urban flood and drought risks. The results demonstrated that the annual average values of precipitation, aridity index, frequency and intensity of extreme precipitation and extreme drought events differed significantly in these cities. The values of the above six climatic indicators in the cities ranged from 9.29–2639.30 mm, 0.47–54.73, 1.08–8.79 time, 7.82–107.25 mm, 0.76–2.99 time, and 10.30–131.19 days, respectively. The geographical patterns of urban precipitation, aridity index, intensity and frequency of extreme precipitation and drought events in China fit well to the Hu‐Huanyong Line that was created in 1940s to identify the pattern of population distribution. Extreme precipitation in most cities has upward trends, except for those around the Hu‐Huanyong Line. The extreme drought events had upward trends in the cities east of the Hu‐Huanyong Line, but there were downward trends in the cities west of the line. The risk assessment indicated that 3.80% cities were facing serious flood and 6.01% cities were facing serious drought risks, which are located in the coast of southern China and northwestern China, respectively, and other 90.19% cities were facing different types of drought and flood risks in terms of their intensity and frequency.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Assessing urban flood and drought risks under climate change, China

Chen

Yuan

et al. 2019

Hydrological Processes

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“…The disaster affected the population of more than one million. Numerous studies have shown that the risk of storm flooding in an urban centre can be partly attributed to the increased replacement of natural land cover by built up areas [1,45]. The risk of flooding to Erbil city is also increased due to the slope of the watershed.…”

Section: Discussionmentioning

confidence: 99%

Estimating the Effect of Urban Growth on Annual Runoff Volume Using GIS in the Erbil Sub-Basin of the Kurdistan Region of Iraq

Hameed

2017

Hydrology

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Abstract:The growth and spread of impervious surfaces within urbanizing catchment areas pose signiificant threats to the quality of natural and built-up environments. Impervious surfaces prevent water infiltration into the soil, resulting in increased runoff generation. The Erbil Sub-basin was selected because the impervious cover is increasing rapidly and is affecting the hydrological condition of the watershed. The overall aim of this study is to examine the impact of urban growth and other changes in land use on runoff response during the study period of 1984 to 2014. The study describes long-term hydrologic responses within the rapidly developing catchment area of Erbil city, in the Kurdistan Region of Iraq. Data from six rainfall stations in and around the Erbil Sub-basin were used. A Digital Elevation Model (DEM) was also used to extract the distribution of the drainage network. Historical levels of urban growth and the corresponding impervious areas, as well as land use/land cover changes were mapped from 1984 to 2014 using a temporal satellite image (Landsat) to determine land use/land cover changes. Land use/land cover was combined with a hydrological model (SCS-CN) to estimate the volume of runoff from the watershed. The study indicates that the urbanization of the watershed has increased the impervious land cover by 71% for the period from 1984 to 2004 and by 51% from 2004 to 2014. The volume of runoff was 85% higher in 2014 as compared to 1984 due to the increase in the impervious surface area; this is attributed to urban growth. The study also points out that the slope of the watershed in the Erbil sub-basin should be taken into account in surface runoff estimation as the upstream part of the watershed has a high gradient and the land is almost barren with very little vegetation cover; this causes an increase in the velocity of the flow and increases the risk of flooding in Erbil city.

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“…The results from an investigation of the Liangshui River in Beijing has indicated that the concentration of NH 4 -N increased rapidly during an intense rainfall event [18]. An assessment of the water quality of runoffs from an urban road in in Guangzhou showed NH 4 -N concentrations around 30 mg/L [19], which indicates that road runoff is a significant contributor to pollution of urban water bodies [18]. Contaminations associated with traffic, such as toxic metals Zn, Cr, Cu, Hg, Ni, Cd and Pb [20] and polycyclic aromatic hydrocarbons (PAHs), can lead to a deterioration of the water quality of urban rivers [21].…”

Section: Introductionmentioning

confidence: 99%

Urban Surface Water Quality, Flood Water Quality and Human Health Impacts in Chinese Cities. What Do We Know?

Rui

Minh

et al. 2018

Water

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Climate change and urbanization have led to an increase in the frequency of extreme water related events such as flooding, which has negative impacts on the environment, economy and human health. With respect to the latter, our understanding of the interrelationship between flooding, urban surface water and human health is still very limited. More in-depth research in this area is needed to further strengthen the process of planning and implementation of responses to mitigate the negative health impacts of flooding in urban areas. The objective of this paper is to assess the state of the research on the interrelationship between surface water quality, flood water quality and human health in urban areas based on the published literature. These insights will be instrumental in identifying and prioritizing future research needs in this area. In this study, research publications in the domain of urban flooding, surface water quality and human health were collated using keyword searches. A detailed assessment of these publications substantiated the limited number of publications focusing on the link between flooding and human health. There was also an uneven geographical distribution of the study areas, as most of the studies focused on developed countries. A few studies have focused on developing countries, although the severity of water quality issues is higher in these countries. The study also revealed a disparity of research in this field across regions in China as most of the studies focused on the populous south-eastern region of China. The lack of studies in some regions has been attributed to the absence of flood water quality monitoring systems which allow the collection of real-time water quality monitoring data during flooding in urban areas. The widespread implementation of cost effective real-time water quality monitoring systems which are based on the latest remote or mobile phone based data acquisition techniques is recommended. Better appreciation of health risks may lead to better flood risk management. In summary, there is still a limited understanding of the relationship between urban surface water quality, flood water quality and health impacts. This also holds true for Chinese cities. Given the widespread and frequent occurrence of urban flooding, further research into this specific cross-cutting field is mandatory.

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Urban flood risk warning under rapid urbanization

Cited by 230 publications

References 8 publications

Assessing urban flood and drought risks under climate change, China

Assessing urban flood and drought risks under climate change, China

Estimating the Effect of Urban Growth on Annual Runoff Volume Using GIS in the Erbil Sub-Basin of the Kurdistan Region of Iraq

Urban Surface Water Quality, Flood Water Quality and Human Health Impacts in Chinese Cities. What Do We Know?

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