scholarly journals Relative Sea Level, Tides, and Extreme Water Levels in Boston Harbor From 1825 to 2018

2018 ◽  
Vol 123 (6) ◽  
pp. 3895-3914 ◽  
Author(s):  
S. A. Talke ◽  
A. C. Kemp ◽  
J. Woodruff
Keyword(s):  
Sea Level ◽  
Water Levels ◽  
Boston Harbor ◽  
Relative Sea Level ◽  
Extreme Water Levels

scholarly journals Assessing the extreme risk of coastal inundation due to climate change: A case study of Rongcheng, China

2017 ◽  
Author(s):  
Aiqing Feng ◽  
Jiangbo Gao ◽  
Shaohong Wu ◽  
Yanzhong Li ◽  
Xiliu Yue
Keyword(s):  
Climate Change ◽  
Sea Level Rise ◽  
Sea Level ◽  
Water Levels ◽  
Assessment Model ◽  
Rcp Scenarios ◽  
Extreme Water Levels ◽  
Extreme Risk ◽  
Extreme Flood

Abstract. Extreme water levels, caused by the joint occurrence of storm surges and high tides, always lead to super floods along coastlines. Given the ongoing climate change, this study explored the risk of future sea-level rise on the extreme inundation by combining P-III model and losses assessment model. Taking Rongcheng as a case study, the integrated risk of extreme water levels was assessed for 2050 and 2100 under three Representative Concentration Pathways (RCP) scenarios of 2.6, 4.5, and 8.5. Results indicated that the increase in total direct losses would reach an average of 60 % in 2100 as a 0.82 m sea-level rise under RCP 8.5. In addition, affected population would be increased by 4.95 % to 13.87 % and GDP (Gross Domestic Product) would be increased by 3.66 % to 10.95 % in 2050 while the augment of affected population and GDP in 2100 would be as twice as in 2050. Residential land and farmland would be under greater flooding risk in terms of the higher exposure and losses than other land-use types. Moreover, this study indicated that sea-level rise shortened the recurrence period of extreme water levels significantly and extreme events would become common. Consequently, the increase in frequency and possible losses of extreme flood events suggested that sea-level rise was very likely to exacerbate the extreme risk of coastal zone in future.

scholarly journals TIME-VARYING EMULATOR FOR SHORT- AND LONG-TERM ANALYSIS OF COASTAL FLOODING (TESLA-FLOOD)

2018 ◽  
pp. 4
Author(s):  
Dylan Anderson ◽  
Peter Ruggiero ◽  
Fernando J. Mendez ◽  
Ana Rueda ◽  
Jose A. Antolinez ◽  
...  
Keyword(s):  
Sea Level ◽  
Storm Surges ◽  
Coastal Flooding ◽  
Water Levels ◽  
Sea Level Anomalies ◽  
Extreme Water Levels ◽  
Flooding Risk ◽  
The Individual ◽  
Flooding Events

The ability to predict coastal flooding events and associated impacts has emerged as a primary societal need within the context of projected sea level rise (SLR) and climate change. The duration and extent of flooding is the result of nonlinear interactions between multiple environmental forcings (oceanographic, meteorological, hydrological) acting at varying spatial (local to global) and temporal scales (hours to centuries). Individual components contributing to total water levels (TWLs) include astronomical tides, monthly sea level anomalies, storm surges, and wave setup. Common practices often use the observational record of extreme water levels to estimate return levels of future extremes. However, such projections often do not account for the individual contribution of processes resulting in compound TWL events, nor do they account for time-dependent probabilities due to seasonal, interannual, and long-term oscillations within the climate system. More robust estimates of coastal flooding risk require the computation of joint probabilities and the simulation of hypothetical TWLs to better constrain the projection of extremes (Serafin [2014]).

scholarly journals The Role of Beach Morphology and Mid-Century Climate Change Effects on Wave Runup and Storm Impact on the Northern Yucatan Coast

2021 ◽  
Vol 9 (5) ◽  
pp. 518
Author(s):  
Gabriela Medellín ◽  
Martí Mayor ◽  
Christian M. Appendini ◽  
Ruth Cerezo-Mota ◽  
José A. Jiménez
Keyword(s):  
Climate Change ◽  
Sea Level ◽  
Water Levels ◽  
Transformation Model ◽  
Wave Runup ◽  
Beach Morphology ◽  
Extreme Water Levels ◽  
Storm Impact ◽  
Wave Conditions

Wave runup is a relevant parameter to determine the storm impact on barrier islands. Here, the role of the beach morphology on wave runup and storm impact was investigated at four coastal communities located on the northern Yucatan coast. Current wave conditions based on regional wind simulations, topo-bathymetric transects measured at each location, and a nonlinear wave transformation model were employed to reconstruct multi-year runup time series. Dune morphology features and extreme water levels (excluding storm surge contributions) were further employed to determine the storm impact at each site for different return periods. Despite the similar offshore conditions along the coast, extreme water levels (i.e., runup and setup) showed intersite differences that were mainly ascribed to subaerial and submerged morphological features. Numerical results showed that the average surf zone beach slope, sandbars, berm, and dune elevation played an important role in controlling extreme water levels and storm impact at the study sites under the present climate. Moreover, in order to assess the potential effect of climate change on coastal flooding, we analyzed wave runup and storm impact in the best-preserved site by considering wave conditions and sea level rise (SLR) projections under the RCP 8.5 scenario. Modelling results suggest no significant increase in the storm impact regime between the present and future conditions in the study area unless SLR is considered. It was found that to accurately estimate SLR contribution, it should be incorporated into mean sea level prior to performing numerical wave runup simulations, rather than simply adding it to the resulting wave-induced water levels.

scholarly journals PREDICTING EXTREME WATER LEVELS AROUND AUSTRALIA

2020 ◽  
pp. 7
Author(s):  
Charitha Pattiaratchi ◽  
Yasha Hetzel ◽  
Ivica Janekovic
Keyword(s):  
Sea Level ◽  
Land Use Planning ◽  
Wind Waves ◽  
Storm Surges ◽  
Flood Management ◽  
Water Levels ◽  
Coastal Development ◽  
Sea Levels ◽  
Extreme Water Levels ◽  
Rising Sea Levels

Throughout history, coastal settlers have had to adapt to periodic coastal flooding. However, as a society we have become increasingly vulnerable to extreme water level events as our cities and our patterns of coastal development become more intricate, populated and interdependent. In addition to this, there is now a real and growing concern about rising sea levels. Accurate estimates of extreme water levels are therefore critical for coastal planning and emergency planning and response. The occurrence of extreme water levels along low-lying, highly populated and/or developed coastlines can lead to considerable loss of life and billions of dollars of damage to coastal infrastructure. Therefore, it is vitally important that the exceedance probabilities of extreme water levels be accurately evaluated to inform risk-based flood management, engineering and future land-use planning. This objectives of this study was to estimate present day extreme sea level exceedance probabilities due to combination of storm surges, tides and mean sea level (including wind-waves) around the coastline of Australia.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/vGaB85VRujs

Shortening the recurrence periods of extreme water levels under future sea-level rise

2016 ◽  
Vol 31 (10) ◽  
pp. 2573-2584 ◽  
Author(s):  
Shaohong Wu ◽  
Aiqing Feng ◽  
Jiangbo Gao ◽  
Manchun Chen ◽  
Yanzhong Li ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Water Levels ◽  
Extreme Water Levels

scholarly journals Assessing the inundation risk resulting from extreme water levels under sea-level rise: a case study of Rongcheng, China

2018 ◽  
Vol 9 (1) ◽  
pp. 456-470 ◽  
Author(s):  
Aiqing Feng ◽  
Jiangbo Gao ◽  
Shaohong Wu ◽  
Lulu Liu ◽  
Yanzhong Li ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Water Levels ◽  
Extreme Water Levels

scholarly journals EXTREME LEVELS ARISING FROM METEOROLOGICAL SURGES

1974 ◽  
Vol 1 (14) ◽  
pp. 1 ◽  
Author(s):  
P. Ackers ◽  
T.D. Ruxton
Keyword(s):  
Sea Level ◽  
North Sea ◽  
High Tide ◽  
Water Levels ◽  
Return Periods ◽  
The North ◽  
Extreme Water Levels ◽  
Independent Events ◽  
The North Sea

The design of coastal works depends on estimating the probabilities of extreme water levels, as well as of waves Previous studies of surge-affected levels have extrapolated observed annual maxima or the n highest levels in n years to predict rarer events In addition to using these well-established methods, m this study of tide levels on the Essex coast of Britain a long term record of extreme levels was synthesised by adding surge residuals at the time of predicted HW to predicted HW levels, treating them as statistically independent events Many more large surge residuals have been measured than extreme water levels as many surges are associated with small tides Events with return periods up to 1000 years may be estimated without extrapolating beyond the range of observed surge residuals and predicted tides This method is assessed in relation to previous methods and information relevant to the design of coastal works in the south western part of the North Sea was obtained In addition to forecasting the probabilities of high tide levels, the study included wave forecasts and the encounter probabilities of combinations of sea level and wave height for various aspects of coastal developments.

scholarly journals Can Managed Realignment Buffer Extreme Surges? The Relationship Between Marsh Width, Vegetation Cover and Surge Attenuation

2021 ◽  
Author(s):  
Joshua Kiesel ◽  
Leigh R. MacPherson ◽  
Mark Schuerch ◽  
Athanasios T. Vafeidis
Keyword(s):  
Sea Level ◽  
Vegetation Cover ◽  
Coastal Wetlands ◽  
Water Levels ◽  
Coastal Protection ◽  
Return Periods ◽  
Managed Realignment ◽  
Extreme Water Levels ◽  
The Relationship

AbstractManaged realignment (MR) involves the landward relocation of sea defences to foster the (re)creation of coastal wetlands and achieve nature-based coastal protection. The wider application of MR is impeded by knowledge gaps related to lacking data on its effectiveness under extreme surges and the role of changes in vegetation cover, for example due to sea-level rise. We employ a calibrated and validated hydrodynamic model to explore relationships between surge attenuation, MR width(/area) and vegetation cover for the MR site of Freiston Shore, UK. We model a range of extreme water levels for four scenarios of variable MR width. We further assess the effects of reduced vegetation cover for the actual MR site and for the scenario of the site with the largest width. We show that surges are amplified for all but the largest two site scenarios, suggesting that increasing MR width results in higher attenuation rates. Substantial surge attenuation (up to 18 cm km−1) is only achieved for the largest site. The greatest contribution to the attenuation in the largest site scenario may come from water being reflected from the breached dike. While vegetation cover has no statistically significant effect on surge attenuations in the original MR site, higher coverage leads to higher attenuation rates in the largest site scenario. We conclude that at the open coast, only large MR sites (> 1148 m width) can attenuate surges with return periods > 10 years, while increased vegetation cover and larger MR widths enable the attenuation of even higher surges.

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