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| Titel |
The possible negative consequences of underground dam and reservoir construction and operation in coastal karst areas: an example of the hydro-electric power plant (HEPP) Ombla near Dubrovnik (Croatia) |
| VerfasserIn |
T. Roje-Bonacci, O. Bonacci |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 8 ; Nr. 13, no. 8 (2013-08-15), S.2041-2052 |
| Datensatznummer |
250085498
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| Publikation (Nr.) |
 copernicus.org/nhess-13-2041-2013.pdf |
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| Zusammenfassung |
| The Ombla Spring represents a typical abundant coastal karst spring located
in the vicinity of the town of Dubrovnik (Croatia). Its outlet is at an
altitude of 2.5 m above sea level (m a.s.l.) and the water from it
immediately flows into the Adriatic Sea. The minimum and maximum measured
discharges are 3.96 m3 s−1 and 117 m3 s−1, respectively.
The Trebišnjica River traverses through its catchment. The mean annual
discharge, after the canalization of over 60 km of its watercourse with
spray concrete (in the time span 1981–2011), is 24.05 m3 s−1.
Before massive civil engineering work which took place during 1968–1980, the
mean annual discharge was 28.35 m3 s−1. There is a project for
construction of the hydro-electric power plant (HEPP) Ombla, which will
exclusively use groundwater from the Ombla Spring karst aquifer. The
underground dam will be constructed about 200 m behind the existing karst
spring outflow in the karst massif, by injecting a grout curtain. The top of
the grout curtain is planned to be at an altitude of 130 m a.s.l. This karst
system is complex, sensitive, vulnerable and ecologically extremely
valuable. The grout curtain, as well as the HEPP Ombla development, could
lead to extremely dangerous technical and environmental consequences. In
this paper some probable, negative consequences of the HEPP Ombla
construction and development are explained. The HEPP Ombla could result in
many large and hard-to-predict negative consequences which are specific for
this particular HEPP, for example (1) severe spring discharge change; (2) unpredictable
regional groundwater redistribution; (3) threatening of endemic fauna; (4) induced seismicity; (5) induced sinkholes; (6) occurrence
of landslides; (7) conflict regarding internationally shared
karst aquifers; (8) intensification of karst flash floods; (9) sea water
intrusion in coastal karst aquifer; etc. |
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