Integrated Approach for the Study of Urban Expansion and River Floods Aimed at Hydrogeomorphic Risk Reduction

Mandarino, Andrea; Faccini, Francesco; Luino, Fabio; Bono, Barbara; Turconi, Laura

doi:10.3390/rs15174158

Cited by 5 publications

(1 citation statement)

References 132 publications

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“…Urbanization and human development can lead to an increase in impermeable surfaces, thereby increasing surface runoff and elevating flood risk. Conversely, natural vegetation and wetlands may contribute to lowering flood risk, as they help slow down water flow and facilitate the absorption of moisture [16,18]. However, the SEI, DEM, and slope are negatively correlated with flood risk in Chongqing.…”

Section: The Association Of Flood Risk Factors Analysismentioning

confidence: 99%

Flood Risk Assessment of Areas under Urbanization in Chongqing, China, by Integrating Multi-Models

Li,

Gao,

Yin

et al. 2024

Remote Sensing

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In the context of urbanization, frequent flood event have become the most common natural disasters, posing a significant challenge to human society. Considering the effects of urbanization on flood risk is critical for flood risk reduction and reasonable land planning strategies at the city scale. This study proposes an integrated approach based on remote sensing data using CA, Markov, and simplified hydrodynamic (FloodMap) models to accurately and effectively assess flood risk under urbanization. Taking Chongqing City as a case study, this paper analyzes the temporal and spatial variations in land use/land cover (LULC) in 2010, 2015, and 2018 and predicts the LULC for 2030, based on historic trends. Flood risk is assessed by combining the hazard, exposure, and modified vulnerability. The results suggest that the area of built-up land will increase significantly from 19.56% in 2018 to 25.21% in 2030. From 2010 to 2030, the area of medium and high inundation depths will increase by 10 and 16 times, respectively. Flood damage varies remarkably according to the LULC and return period. The expected annual damage (EAD) has been estimated to increase from USD 68 million in 2010 to USD 200 million in 2030. Flood risk is proportional to population and is significantly inversely proportional to socioeconomic level. The approach used here can provide a comprehensive understanding of flood risk and is significant for land-use policymaking and the management of flood control facilities.

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Section: The Association Of Flood Risk Factors Analysismentioning

confidence: 99%

Flood Risk Assessment of Areas under Urbanization in Chongqing, China, by Integrating Multi-Models

Li,

Gao,

Yin

et al. 2024

Remote Sensing

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Safe development paradox: evidence and methodological insights from a systematic review

Fusinato,

Han,

Kobiyama

et al. 2024

Nat Hazards

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Hydrological hazards pose significant threats worldwide, resulting in extensive societal and environmental impacts. To mitigate these impacts, structural protection measures like levees are commonly implemented. However, these measures can overlook complex human-water interactions and cause unintended consequences, such as the safe development paradox (SDP) and its sub-phenomena, the levee effect (LE), where risk reduction efforts paradoxically increase risk in the long run due to a false sense of safety. Despite the growing body of research on the SDP and LE, existing evidence remains fragmented due to the diverse methodologies and variables considered. To address this gap, we systematically reviewed 94 studies spanning 2001–2023 to synthesize the methodological approaches, variables, and evidence in this field. Most of the reviewed studies (75%) provided conclusive evidence to support the occurrence of the SDP and LE via three key mechanisms: (a) increased development in protected areas, (b) reduced preparedness and false sense of safety, and (c) increased damage from rare disaster events. About 40% of the reviewed case studies focused solely on exposure, overlooking other critical dimensions of the SDP and LE, such as vulnerability and behavioral aspects linked to a false sense of safety. Furthermore, the effect of non-structural and individual adaptation measures on the SDP and LE remains underinvestigated. A more holistic assessment of these socio-hydrological phenomena should thus include aspects such as preparedness, vulnerability, and risk perception. This holistic approach would enable a better understanding of the diversity of scenarios where the SDP and LE can manifest, providing policymakers with essential information to prevent unintended consequences of adaptation.

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Effects of urbanization on river morphology in a Mediterranean coastal city (Genova, Italy)

Mandarino,

Brandolini,

Terrone

et al. 2024

Progress in Physical Geography: Earth and Environment

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From the geomorphological point of view, urbanization changes fluvial systems more drastically than any other single human activity. Its impact on rivers is of interest as it results in serious issues concerning geomorphic instability, ecosystem service reduction, and geo-hydrological risk increase. The present study provides a quantitative and qualitative assessment of landscape changes driven by urbanization, which occurred from the mid-19th century to the present day along the lower reaches of the Bisagno and Polcevera rivers and their tributaries in the Mediterranean coastal city of Genova (NW Italy). The bankfull channel morphological adjustments, the minor hydrographic network disappearance, the land use and land cover changes, and the current physical accessibility of river margins were investigated. This work is based on collection and review of historical data, photograph interpretation, GIS analysis, and field surveys. Urbanization essentially occurred between the mid-19th century and the late 1930s. The bankfull channel of the Bisagno and Polcevera rivers experienced large narrowing associated with widespread establishment of channelization structures. The minor hydrographic network essentially disappeared underground. After the 1930s, further minor anthropogenic interventions were implemented to accommodate urban expansion and consolidate channelization works; however, the overall geomorphological setting remained unchanged. The geomorphological evolution of the Bisagno and Polcevera rivers followed three different phases associated with the urban expansion process. Nowadays, the study area is completely urbanized, the fluvial stems flowing through the valley floor are totally disconnected from their adjacent areas, the main rivers show a relevant geomorphological stability induced by anthropogenic pressures, and the accessibility of river margins for people is rather limited. The outcomes from this study represent an essential knowledge base for technicians and policymakers to plan urban development and inform effective and sustainable management measures. Moreover, they provide insights into the medium- and short-term morphological evolution of urban rivers.

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Integrated Approach for the Study of Urban Expansion and River Floods Aimed at Hydrogeomorphic Risk Reduction

Cited by 5 publications

References 132 publications

Flood Risk Assessment of Areas under Urbanization in Chongqing, China, by Integrating Multi-Models

Flood Risk Assessment of Areas under Urbanization in Chongqing, China, by Integrating Multi-Models

Safe development paradox: evidence and methodological insights from a systematic review

Effects of urbanization on river morphology in a Mediterranean coastal city (Genova, Italy)

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