Evaluating pluvial flood hazard for highly urbanised cities: a case study of the Pearl River Delta Region in China

Jian, Wei; Li, Shanshan; Lai, Chengguang; Wang, Zhaoli; Cheng, Xiangju; Lo, Edmond Yat-Man; Pan, Tso–Chien

doi:10.1007/s11069-020-04372-3

Cited by 22 publications

(9 citation statements)

References 35 publications

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Section: Methodsmentioning

confidence: 99%

“…(2015). This study generally follows the hazard assessment procedures carried out for the wider PRD region in Jian et al. (2021) with slight modifications.…”

Section: Methodsmentioning

confidence: 99%

“…Surface water flooding caused by intense precipitation was considered in assessing the present (2016) and future (2030) flood hazard in Shenzhen using a GIS-based fuzzy comprehensive evaluation method as detailed in Lai et al (2015) and Jian et al (2021). The index-based fuzzy comprehensive evaluation method uses membership functions to differentiate the relative rankings according to index values (Zadeh, 1965(Zadeh, , 1978 and their relative importance.…”

Section: Flood Hazard Assessmentmentioning

confidence: 99%

“…The two weight sets are further combined using game theory following Lai et al (2015). This study generally follows the hazard assessment procedures carried out for the wider PRD region in Jian et al (2021) with slight modifications. We use six indices that directly reflect the characteristics of the rainfall-runoff-inundation process for flood hazard assessment, addressing the local meteorological characteristics and catchment characteristics.…”

Section: Flood Hazard Assessmentmentioning

confidence: 99%

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Spatio-temporal dynamics of flood exposure in Shenzhen from present to future

Sarica¹,

Zhu²,

Jian

et al. 2021

Environment and Planning B: Urban Analytics and City Science

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The Pearl River Delta metropolitan region is one of the most densely urbanized megapolises worldwide with high exposure to weather-related disasters such as storms, storm surges and river floods. Shenzhen megacity has been the fastest growing city in the Pearl River Delta region with a significant increase of resident population from 0.32 million in 1980 to 13.03 million in 2018. Being a flood-prone city, Shenzhen’s rapid urbanization has further exacerbated potential flood losses and forthcoming risk. Thus, evaluating the changes in its exposure from present to future is essential for flood risk assessment, mitigation and management purposes. The main objective of this study is to present a methodology to assess the spatio-temporal dynamics of flood exposure from present to future using high-resolution and open-source data with a particular focus on the built-up area. To achieve this, the SLEUTH model, a cellular automata-based urban growth model, was employed for predicting the built-up area in Shenzhen in 2030. An almost threefold increase was observed in total built-up area from 421 km2 in 1995 to 1166 km2 in 2030, with the 2016 built-up area being 858 km2. Built-up areas, both present (2016) and projected (2030), were then used as the land cover input for flood hazard assessment based on a fuzzy comprehensive evaluation model, which classified the flood hazard into five levels. The analysis indicates that the built-up area subjected to the two highest flood hazard levels will increase by almost 88% (212 km2) from present to future. The approach presented here can be leveraged by policymakers to identify critical areas that should be prioritized for flood mitigation and protection actions to minimize potential losses.

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Section: Methodsmentioning

confidence: 99%

“…(2015). This study generally follows the hazard assessment procedures carried out for the wider PRD region in Jian et al. (2021) with slight modifications.…”

Section: Methodsmentioning

confidence: 99%

Section: Flood Hazard Assessmentmentioning

confidence: 99%

Section: Flood Hazard Assessmentmentioning

confidence: 99%

See 2 more Smart Citations

Spatio-temporal dynamics of flood exposure in Shenzhen from present to future

Sarica¹,

Zhu²,

Jian

et al. 2021

Environment and Planning B: Urban Analytics and City Science

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“…In the last decade, pluvial flood risk has also emerged as a research topic [9][10][11][12]. Recent work started focusing on compound events [13][14][15][16] establishing multi-hazard risk assessment frameworks.…”

Section: Introductionmentioning

confidence: 99%

Service Accessibility Risk (SAR) Assessment for Pluvial and Fluvial Floods in an Urban Context

et al. 2021

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The development of strategies to adapt to and mitigate the potential adverse consequences of natural hazards requires support from risk assessment studies that quantify the impacts of hazardous events on our society. A comprehensive analysis of risk commonly evaluates the elements exposed to the hazard probabilistic scenarios and their vulnerabilities. However, while significant advances have been made in the assessment of direct losses, indirect impacts are less frequently examined. This work assesses the indirect consequences of two hydrologic hazards, i.e., pluvial and fluvial floods, in an urban context from a system perspective. It presents a methodology to estimate the services accessibility risk (SAR) that considers the accessibility of roads and the connection between providers and users of services in a city. The feasibility of the proposed approach is illustrated by an application to a pilot study in Monza city (northern Italy) considering pluvial and fluvial flood hazard with different return periods. The results in terms of the social and economic impacts are analyzed considering features of age, disability, and the different economic sectors.

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Site assessment and evaluation of the structural damages after the flood disaster in the Western Black Sea Basin on August 11, 2021

et al. 2022

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On August 11, 2021, one of the most destructive ood disasters occurred in the Western Black Sea Basin of Turkey. The ood resulted in the death of 76 individuals, with an estimated 30,000 people being affected by the disaster. A maximum precipitation depth of 400 mm/day was recorded at one station, indicating that the ood occurred at least during a 500-year rainfall event. During a two-day site visit immediately following the ooding event, damages to infrastructures, water structures, bridges, revetment walls, highways, and residentials were observed in the Bozkurt and Ayancık regions. Based on the observations, the ood wave propagated through the original meandering river bed and oodplain, exceeding the restored river bed capacity. Due to the massive sediment transport and drifting trees, the basements of the structures in these regions were ooded and blocked. The enormous ood ow triggered extensive scouring on bridge piers, building foundations, and revetment walls, eventually causing the walls and bridges to collapse. The collapse of structures blocked the waterway and ampli ed the backwater effect when combined with the sediment transport. The total collapse of the revetment walls in some sections of the stream caused accelerated scouring beyond the foundations of the nearby buildings. Partial damages on the side roads along the river beds were also observed. This paper evaluated the driving mechanism of damages caused by ood ow from hydrological, structural, and geotechnical perspectives. Based on these observations and assessments, recommendations on engineering design guidelines for structures close to the oodplain, such as bridges, revetment walls, and side roads, were elaborated. Emphasis was placed on the ood-resistant design of these structures to develop a comprehensive approach for ood risk management.Flood disaster poses a signi cant risk for the environment and human life (Siddiqui, 2011;Cook and Merwade, 2009). Millions of people lose their lives, and nancial losses are experienced due to oods in various parts of the world. For example, Pakistan, India, and China were severely affected by oods in

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Evaluating pluvial flood hazard for highly urbanised cities: a case study of the Pearl River Delta Region in China

Cited by 22 publications

References 35 publications

Spatio-temporal dynamics of flood exposure in Shenzhen from present to future

Spatio-temporal dynamics of flood exposure in Shenzhen from present to future

Service Accessibility Risk (SAR) Assessment for Pluvial and Fluvial Floods in an Urban Context

Site assessment and evaluation of the structural damages after the flood disaster in the Western Black Sea Basin on August 11, 2021

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