Impacts of Sea Level Rise on Coastal Communities: Definitions and Catastrophes

The impact of sea level rise varies differently across the globe, but certain levels can be considered highly catastrophic. This article delves into the thresholds that define such a significant level of sea level rise in a specific region, the Adriatic Sea in the Mediterranean/Southern Europe. We will explore how much rise in sea levels would be considered catastrophic, what effects such a rise would have on coastal communities, and how communities might respond.

1 Meter Rise: A Definite Catastrophe

1 meter of sea level rise would be a definitive catastrophe for the Adriatic Sea region. The tidal changes in this area range from 0.3 to 0.7 meters, and the ports were built to withstand these changes. However, with a 1-meter rise, almost all ports would experience regular flooding, which could lead to severe infrastructure damage and economic losses. Significant investments would be required to mitigate the impact, including elevation of infrastructure, relocation of buildings, and raising shorelines. Nonetheless, even with such investments, the restoration of many coastal areas might remain elusive.

15 Meters: A Catastrophe Squared

If the sea level were to rise by 15 meters, the consequences would be exponentially more severe. Entire cities and villages would have to be abandoned. People living in these areas would face challenges that are nearly insurmountable as flooding would occur frequently. Even if one were to live on higher ground away from harbors, the regular flooding would make life unsustainable. Such a rise would not only flood streets but also homes, underground spaces, and essential properties, causing widespread destruction.

0.3 to 0.5 Meters: Zone of Definitions and Severe Consequences

Between 1 and 15 meters, the impact of sea level rise becomes more regional and complex. An additional 0.3 to 0.5 meters (1 to 1.5 feet) of rise would put communities in a critical situation. Some might consider this a severe problem that can still be managed, but it already qualifies as a catastrophe for others, particularly those in densely populated areas. Flooding would occur several times a decade, destroying homes, damaging property, and rendering fertile land unusable due to salinization. Continuous flooding would lead to the depletion of soil fertility, impacting agricultural productivity and economic stability in the region.

Historical Context and Current Trends

According to historical data, the sea level has risen between 16 and 21 cm (6.3 to 8.3 inches) between 1900 and 2016, with a gradual but significant increase observed. This trend indicates that the sea level is rising at a steady pace, even if the rate of increase may not be immediately noticeable. The continuous rise in sea levels poses a significant threat to coastal communities, and proactive measures must be taken to address this issue before it becomes unmanageable.

Sources:

Sea level rise - Wikipedia Climate Science Special Report: Sea Level Rise