Naslov
Salinization of Vrana Lake in Dalmatia Within the Context of Anthropogenic Influences and Climate Changes (Situation in 2008)

Autori
Rubinić, Josip ; Katalinić, Ana ; Švonja, Mirjana ; Gabrić, Ivana ; Bušelić, Gordana ; Ćuže, Maja ; Horvat, Bojana

Vrsta, podvrsta i kategorija rada
Poglavlja u knjigama, znanstveni

Knjiga
Sustainability of the karst environment - Dinaric karst and other karst regions

Urednik/ci
Bonacci, Ognjen

Izdavač
UNESCO

Grad
Pariz

Godina
2010

Raspon stranica
171-178

ISBN
0-387-18105-9

Ključne riječi
water salinization, karst, Vrana lake, Dalmatia

Sažetak
Vrana Lake is a coastal lake in Dalmatia (Croatia), protected as Nature park. Although it is by its surface of about 30 km2 the largest lake in Croatia, its volume comprises only about 82.5 mil m3. The lake is a cryptodepression (with maximum level depth -3m) separated from the sea by a 0.8 – 2.5 km wide limestone ridge within which the coastal karst aquifer interacts with both the sea and the lake. Therefore this lake is a very sensitive karst coastal system with a close interaction with the sea - a direct interaction through the 800 m long Prosika canal and the indirect interaction through the karst aquifer. The period of a few recent years (particularly 2007- 2008) has been characterized by pronounced draughty hydrological conditions. Evidence of the lake critical condition is the total volume of water flowing out into the sea through the Prosika canal of only about 0, 19 mil. m3 in the year 2008 which is minor as compared to the average of about 31, 8 mil.m3 for the analyzed period 2000-2008. Consequently, during the summer of 2008, the water level of Vrana lake fell under the sill level of Prosika canal and in specific conditions of daily sea level fluctuations even below the sea level. That caused the sea to flow into the lake directly through Prosika canal and also through numerous springs on the lake shore. The result was an enormous increase in lake water salinity. Chloride concentration values in southern part of the lake where Prosika canal and a large number of salty inshore springs is situated increased up to 6500 mg/l in 2008, compared to the average of 590 mgl-1 for the previously analyzed period from 2000 to 2006.. Within the context, the sill level of the constructed Prosika canal, which was once sufficient for the stabilization of Vrana lake, can be a problem which generates an increase in lake salinization.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Građevinarstvo

POVEZANOST RADA