Data from the drain: a sensor framework that captures multiple drivers of chronic coastal floods

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1029/2022WR032392. This is version 2 of this Preprint.

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Authors

Adam Gold, Katherine Anarde, Lauren Grimley, Ryan Neve, Emma Rudy Srebnik, Thomas Thelen , Anthony Whipple, Miyuki Hino

Abstract

Tide gauge water levels are commonly used as a proxy for flood incidence on land. These proxies are useful for projecting how sea-level rise (SLR) will increase the frequency of coastal flooding. However, tide gauges do not account for land-based sources of coastal flooding and therefore flood thresholds and the proxies derived from them likely underestimate the current and future frequency of coastal flooding. Here we present a new sensor framework for measuring the incidence of coastal floods that captures both subterranean and land-based contributions to flooding. The low-cost, open-source sensor framework consists of a storm drain water level sensor, roadway camera, and wireless gateway that transmit data in real-time. During five months of deployment in the Town of Beaufort, North Carolina, 24 flood events were recorded. 25% of those events were driven by land-based sources – rainfall, combined with moderate high tides and reduced capacity in storm drains. Consequently, we find that flood frequency is higher than that suggested by proxies that rely exclusively on tide gauge water levels for determining flood incidence. This finding likely extends to other locations where stormwater networks are at a reduced drainage capacity due to SLR. Our results highlight the benefits of instrumenting stormwater networks directly to capture multiple drivers of coastal flooding. More accurate estimates of the frequency and drivers of floods in low-lying coastal communities can enable the development of more effective long-term adaptation strategies.

DOI

https://doi.org/10.31223/X5CH1C

Subjects

Earth Sciences, Environmental Monitoring, Environmental Sciences, Hydrology, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Keywords

coastal flooding, low-cost sensors, high tide flooding, stormwater management, coastal infrastructure, Sea level rise

Dates

Published: 2022-04-02 08:20

Last Updated: 2023-02-10 17:18

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License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None