Hrvatske vode
 
Ranjivost obala otoka Raba zbog rasta razine mora
Vulnerability of the Rab island coastline due to sea level rise

Igor Ružić1, Čedomir Benac1

Sažetak/Abstract: 

U ovom je radu opisana ranjivost obala otoka Raba koja može biti prouzročena prognoziranim porastom razine mora do kraja 21. stoljeća. Opisane su posljedice koju taj prirodni fenomen može prouzročiti. Analizirana su tri scenarija pojava visoke razine mora: kod stagnacije globalne morske razine te kod porasta za 30 i 60 cm. Analize su napravljene na topografskim kartama mjerila 1:5000. Ustanovljene su najugroženije urbanizirane obalne zone: uvala Sv. Eufemija, luka grada Raba, Supetarska Draga i uvala Lopar. Procijenjen je utjecaj povišenja morske razine na djelovanje valova u istraženim obalnim zonama. Kao posljedica porasta morske razine može se očekivati širenje zaslanjenih priobalnih zona na poljoprivredne površine. Vjerojatno će se pojačati marinske erozije na obalama, što će prouzročiti nazadovanje klifova i/ili smanjenje tijela brojnih pjeskovitih žala. Problem može biti i otežana odvodnja s niskih i zaravnjenih dijelova terena kao i rad lokalne oborinske i fekalne kanalizacije. Mogu biti ugroženi i stambeni objekti koji su posljednjih desetljeća izgrađeni u niskim obalnim zonama, kao i neke građevine u srednjovjekovnoj gradskoj jezgri Raba.

 

The paper describes the vulnerability of the Rab island coastline which may be caused by the forecast sea level rising by the end of the 21st century, including the consequences potentially resulting from this natural phenomenon. Three scenarios of high sea level occurrence were analysed: the case of stagnating global sea levels and the cases of sea level rising by 30 and 60 cm. The analyses were conducted on topographic maps in scale 1:5000. The following urbanised coastal zones were established: Sv. Eufemija cove, Port Rab, Supetarska Draga and Lopar cove. The impact of rising sea levels on the wave action in the investigated coastal zones was estimated. Due to rising sea levels, it can be expected that the salinized coastal zones will spread to agricultural land. It is probable that the marine erosion of the coastline will increase, causing a decline in cliffs and/or decrease in the size of numerous sandy beaches. Further problems may consist in a more difficult drainage of low and flat parts of the terrain and the functioning of the local stormwater and faecal sewerage. Additionally, residential buildings constructed in low-lying coastal zones in the recent decades may be threatened as well, including some structures in the medieval historic centre of the town Rab.

Kategorija: 
Prethodno priopćenje / Preliminary Report
Ključne riječi/Key words: 

rast razine mora, visoka voda, hazard, ranjivost, otok Rab, Jadransko more

sea level rise, floods, hazard, vulnerability, Rab island, Adriatic sea

Podaci o autorima/Authors affiliations: 

1Sveučilište u Rijeci, Građevinski fakultet, Radmile Matejčić 3, 51000 Rijeka iruzic@uniri.hr

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