Hrvatske vode, Vol. 28 No. 114, 2020.
Professional paper
The impact of hydrotechnical interventions on the water regime of Baćina Lakes
Ognjen Bonacci
orcid.org/0000-0002-7123-3421
; Sveučilište u Splitu, Fakultet građevinarstva, arhitekture i geodezije, Split, Hrvatska
Tanja Roje-Bonacci
orcid.org/0000-0002-7123-3421
; Sveučilište u Splitu, Fakultet građevinarstva, arhitekture i geodezije, Split, Hrvatska
Abstract
The analysis included the characteristic (minimum, average and maximum) daily, monthly and annual water levels at the water meter Šipak, which is located in Sladinac Lake, one of the five connected lakes (Plitko, Podgora, Očuša, Sladinac and Crniševo Lakes) and one unconnected lake (Vrbnik Lake) in the system of Baćina Lakes. A series of daily water levels from 1 January 1923 to 31 December 2018 was available, with interruptions from 1 October 1942 to 31 June 1945 and from 1 January 1959 to 31 December 1972. The analyses focused on the quantification of anthropogenic interventions on the water regime of the system Baćina Lakes. The tunnel Krotuše, which is used for evacuating flood water from the karst field Vrgorac and letting it into the system Baćina Lakes, started operating on 21 November 1938. It was reconstructed several times, the most comprehensively at the end of 1973. The tunnel evacuating water from Baćina Lakes to the Adriatic Sea started operating at the end of 1912. The works on its extension were carried out in the period from the end of 1938 to the beginning of 1940. In the 1982 - 1993 period, a 80 cm tall sill preventing seawater intrusion into the lake system during tides was removed from the tunnel’s entrance. Detailed statistical analyses based on applying the F test (Markowski and Markowski, 1990) and t-test (Machiwal and Jha, 2008) determined the impact of each individual mentioned intervention on the change in the water regime of the system Baćina Lakes on the year-and-month time scale. A continuous decrease in the average annual water levels was measured at the water meter Šipak. A permanent increase in the maximum annual water levels was determined as well.
Keywords
hydrology, water level, anthropogenic influence, Baćina Lakes
Hrčak ID:
254511
URI
Publication date:
30.12.2020.
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