scholarly journals Insar Maps of Land Subsidence and Sea Level Scenarios to Quantify the Flood Inundation Risk in Coastal Cities: The Case of Singapore

2020 ◽  
Vol 12 (2) ◽  
pp. 296 ◽  
Author(s):  
Joao Catalao ◽  
Durairaju Raju ◽  
Giovanni Nico
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Land Subsidence ◽  
Central Area ◽  
Coastal Areas ◽  
Sar Interferometry ◽  
Asia Pacific ◽  
Flood Vulnerability ◽  
Global Mean Sea Level ◽  
Global Sea Level

Global mean sea level rise associated with global warming has a major impact on coastal areas and represents one of the significant natural hazards. The Asia-Pacific region, which has the highest concentration of human population in the world, represents one of the larger areas on Earth being threatened by the rise of sea level. Recent studies indicate a global sea level of 3.2 mm/yr as measured from 20 years of satellite altimetry. The combined effect of sea level rise and local land subsidence, can be overwhelming for coastal areas. The Synthetic Aperture Radar (SAR) interferometry technique is used to process a time series of TerraSAR-X images and estimate the land subsidence in the urban area of Singapore. Interferometric SAR (InSAR) measurements are merged to the Representative Concentration Pathway (RCP) 4.5 and RCP 8.5 sea-level rise scenarios to identify projected inundated areas and provide a map of flood vulnerability. Subsiding rates larger than 5 mm/year are found near the shore on the low flat land, associated to areas recently reclaimed or built. The projected flooded map of Singapore are provided for different sea-level rise scenarios. In this study, we show that local land subsidence can increase the flood vulnerability caused by sea level rise by 2100 projections. This can represent an increase of 25% in the flood area in the central area of Singapore for the RCP4.5 scenario.

Effects of Sea-Level Rise and Subsidence on Deltas

2016 ◽  
Author(s):  
Thomas S. Bianchi
Keyword(s):  
Thermal Expansion ◽  
Global Warming ◽  
Sea Level Rise ◽  
Sea Level ◽  
Sea Level Change ◽  
Mean Sea Level ◽  
Level Change ◽  
Global Mean Sea Level ◽  
Global Sea Level ◽  
Global Mean

As I briefly mentioned in Chapter 3, the global mean sea level, as deduced from the accumulation of paleo-sea level, tide gauge, and satellite-altimeter data, rose by 0.19 m (range, 0.17–0.21 m) between 1901 and 2010 (see Figure 3.3). Global mean sea level represents the longer-term global changes in sea level, without the short-term variability, and is also commonly called eustatic sea-level change. On an annual basis, global mean sea-level change translates to around 1.5 to 2 mm. During the last century, global sea level rose by 10 to 25 cm. Projections of sea-level rise for the period from 2000 to 2081 indicate that global mean sea-level rise will likely be as high as 0.52 to 0.98 m, or 8 to 16 mm/ yr, depending on the greenhouse gas emission scenarios used in the models. Mean sea-level rise is primarily controlled by ocean thermal expansion. But there is also transfer of water from land to ocean via melting of land ice, primarily in Greenland and Antarctica. Model predictions indicate that thermal expansion will increase with global warming because the contribution from glaciers will decrease as their volume is lost over time. (Take a look at Figure 5.1 if you have doubts about glaciers melting.) And remember our discussion in Chapter 2 about the role of the oceans in absorbing carbon dioxide (CO2) and the resultant ocean acidification in recent years. The global ocean also absorbs about 90% of all the net energy increase from global warming as well, which is why the ocean temperature is increasing, which in turn results in thermal expansion and sea-level rise. To make things even more complicated, the expansion of water will vary with latitude because expansion of seawater is greater with increasing temperature. In any event, sea level is expected to rise by 1 to 3 m per degree of warming over the next few millennia.

Adaptation to Sea Level Rise in Densely Populated Coastal Areas: Learning from Examples of Land Subsidence in Japan, Indonesia and the Philippines

APAC 2019 ◽  
2019 ◽  
pp. 1185-1192
Author(s):  
Miguel Esteban ◽  
Hiroshi Takagi ◽  
Motoharu Onuki ◽  
Christopher Chadwick ◽  
Tomoya Shibayama ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Land Subsidence ◽  
The Philippines ◽  
Coastal Areas ◽  
Learning From Examples

scholarly journals A reconciled solution of Meltwater Pulse 1A sources using sea-level fingerprinting

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yucheng Lin ◽  
Fiona D. Hibbert ◽  
Pippa L. Whitehouse ◽  
Sarah A. Woodroffe ◽  
Anthony Purcell ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Last Deglaciation ◽  
Considerable Uncertainty ◽  
Isostatic Adjustment ◽  
Geographically Distributed ◽  
The Last Deglaciation ◽  
Global Mean Sea Level ◽  
Global Sea Level ◽  
The Relationship

AbstractThe most rapid global sea-level rise event of the last deglaciation, Meltwater Pulse 1A (MWP-1A), occurred ∼14,650 years ago. Considerable uncertainty regarding the sources of meltwater limits understanding of the relationship between MWP-1A and the concurrent fast-changing climate. Here we present a data-driven inversion approach, using a glacio-isostatic adjustment model to invert for the sources of MWP-1A via sea-level constraints from six geographically distributed sites. The results suggest contributions from Antarctica, 1.3 m (0–5.9 m; 95% probability), Scandinavia, 4.6 m (3.2–6.4 m) and North America, 12.0 m (5.6–15.4 m), giving a global mean sea-level rise of 17.9 m (15.7–20.2 m) in 500 years. Only a North American dominant scenario successfully predicts the observed sea-level change across our six sites and an Antarctic dominant scenario is firmly refuted by Scottish isolation basin records. Our sea-level based results therefore reconcile with field-based ice-sheet reconstructions.

scholarly journals Vulnerability of Venice's coastland to relative sea-level rise

2020 ◽  
Vol 382 ◽  
pp. 689-695
Author(s):  
Luigi Tosi ◽  
Cristina Da Lio ◽  
Sandra Donnici ◽  
Tazio Strozzi ◽  
Pietro Teatini
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Land Subsidence ◽  
Regional Scale ◽  
Sar Interferometry ◽  
Economic Activities ◽  
Relative Sea Level ◽  
Coastal System ◽  
Relative Sea Level Rise ◽  
The Mean

Abstract. Relative sea-level rise (RSLR), i.e. sea-level rise due to climate changes combined with land subsidence, is one of the processes that is most severely threatening the coastal systems around the world. The Venice coastland forms the major low-lying area in Italy and encompasses a variety of environments, such as farmlands, estuaries, deltas, lagoons and urbanized areas. Valuable ecosystems, historical heritages and economic activities are located in this area. Since most of the territory lies at a ground elevation below or slightly above the mean sea-level, also a few mm yr−1 of land subsidence can seriously impacts on the Venice coastal system. In this study, we present an analysis of the vulnerability to RSLR considering an uneven land subsidence distribution, with an application on the Venice coastland. The analysis is delineated at the regional scale by an index-based model and a proper coupling of various thematic layers, such as high spatial resolution land subsidence data retrieved by satellite SAR interferometry, ongoing and projected sea-level rise trends, and morpho-physiographic setting of the coastland.

scholarly journals Reply to ‘Waves do not contribute to global sea-level rise’

2018 ◽  
Vol 9 (1) ◽  
pp. 3-3 ◽  
Author(s):  
Angélique Melet ◽  
Benoît Meyssignac ◽  
Rafaël Almar ◽  
Gonéri Le Cozannet
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Global Sea Level
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