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  The utility of using Volunteered Geographic Information (VGI) for evaluating pluvial flood models

Drews, M., Steinhausen, M., Larsen, M. A. D., Dømgaard, M. L., Huszti, L., Rácz, T., Wortmann, M., Hattermann, F. F., Schröter, K. (2023): The utility of using Volunteered Geographic Information (VGI) for evaluating pluvial flood models. - Science of the Total Environment, 894, 164962.
https://doi.org/10.1016/j.scitotenv.2023.164962

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 Creators:
Drews, Martin1, Author
Steinhausen, Max1, Author
Larsen, Morten Andreas Dahl1, Author
Dømgaard, Mads Lykke1, Author
Huszti, Levente1, Author
Rácz, Tibor1, Author
Wortmann, Michel2, Author              
Hattermann, Fred Fokko2, Author              
Schröter, Kai1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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Free keywords: Volunteered Geographic Information, VGI, Pluvial flooding, Inundation models, Risk assessment, Budapest
 Abstract: Pluvial floods are increasingly threatening urban environments worldwide due to human-induced climate change. High-resolution, state-of-the-art pluvial flood models are urgently needed to inform climate change adaptation and disaster risk reduction measures but are generally not empirically tested because of the rarity of local high-intensity precipitation events and the lack of monitoring capabilities. Volunteered Geographic Information (VGI) collected by professionals, non-professionals and citizens and made available on the internet can be used to monitor the dynamic extent of a pluvial flood during and after an extreme rain event but is sometimes considered to be unreliable. In this paper, we explore the general utility of VGI to evaluate the performance of pluvial flood models and gain new insights to improve these models. As background for our research, we use the capital city of Budapest, which recently suffered three heavy rainfall events in just five years (2015, 2017 and 2020). For each pluvial flood event, we collected photographic evidence from different online media sources and estimated the associated water depths at various locations in the city from the image context. These were compared with the results of a 2D pluvial flood model that has been shown to provide comparable results to other state-of-the-art inundation models and is easily transferred to other urban areas due to its reliance on open data sources. We introduce a general methodology for comparing VGI with model data by probing different spatial resolutions. Our findings highlight untapped potential and fundamental challenges in using VGI for model evaluation. It is proposed that VGI may become an essential tool and improve the confidence in model-based risk assessments for climate change adaptation and disaster risk reduction.

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Language(s): eng - English
 Dates: 2022-12-302023-06-152023-06-172023-10-10
 Publication Status: Finally published
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.scitotenv.2023.164962
Organisational keyword: RD2 - Climate Resilience
PIKDOMAIN: RD2 - Climate Resilience
Working Group: Hydroclimatic Risks
Regional keyword: Europe
Regional keyword: Global
Research topic keyword: Climate impacts
Research topic keyword: Extremes
MDB-ID: No data to archive
OATYPE: Hybrid Open Access
 Degree: -

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Title: Science of the Total Environment
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 894 Sequence Number: 164962 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals444
Publisher: Elsevier