Abstract
Abstract. Extreme water levels generating flooding in estuarine and coastal environments are often driven by compound events, where many individual processes such as waves, storm surge, streamflow, and tides coincide. Despite this, extreme water levels are typically modeled in isolated open-coast or estuarine environments, potentially mischaracterizing the true risk of flooding facing coastal communities. This paper explores the variability of extreme water levels near the tribal community of La Push, within the Quileute Indian Reservation on the Washington state coast, where a river signal is apparent in tide gauge measurements during high-discharge events. To estimate the influence of multiple forcings on high water levels a hybrid modeling framework is developed, where probabilistic simulations of joint still water level and river discharge occurrences are merged with a hydraulic model that simulates along-river water levels. This methodology produces along-river water levels from thousands of combinations of events not necessarily captured in the observational records. We show that the 100-year still water level event and the 100-year discharge event do not always produce the 100-year along-river water level. Furthermore, along specific sections of river, both still water level and discharge are necessary for producing the 100-year along-river water level. Understanding the relative forcing driving extreme water levels along an ocean-to-river gradient will help communities within inlets better understand their risk to the compounding impacts of various environmental forcing, which is important for increasing their resilience to future flooding events.
Subject
General Earth and Planetary Sciences
Reference54 articles.
1. Allan, J. C. and Komar, P. D.: Extreme storms on the Pacific Northwest coast during the 1997–98 El Niño and 1998–99 La Niña, J. Coast. Res., 18, 175–193, 2002. a
2. Allan, J. C., Komar, P. D., and Ruggiero, P.: Storm Surge Magnitudes and
Frequency on the Central Oregon Coast, in: Proc. Solutions to Coastal
Disasters Conf., 26–29 June 2011, Anchorage, Alaska, 2011. a, b
3. Bevacqua, E., Maraun, D., Hobæk Haff, I., Widmann, M., and Vrac, M.: Multivariate statistical modelling of compound events via pair-copula constructions: analysis of floods in Ravenna (Italy), Hydrol. Earth Syst. Sci., 21, 2701–2723, https://doi.org/10.5194/hess-21-2701-2017, 2017. a, b
4. Bilskie, M. and Hagen, S.: Defining Flood Zone Transitions in Low-Gradient
Coastal Regions, Geophys. Res. Lett., 45, 2761–2770, 2018. a, b, c
5. Bromirski, P. D., Flick, R. E., and Miller, A. J.: Storm surge along the
Pacific coast of North America, J. Geophys. Res.-Oceans, 122, 441–457, 2017. a
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