The use of inverse geotherms for determining underground water flow at the Ombla karst spring near Dubrovnik, Croatia

Ravnik, Danilo; Rajver, Dušan

doi:10.1016/s0926-9851(98)00026-3

Cited by 13 publications

(13 citation statements)

References 5 publications

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“…The projected total area of the curtain is about 300 000 m 2 . The total length of the curtain will be about 1470 m, while its maximum depth will be 410 m. Figure 4 shows a cross-section of the projected grout curtain (underground dam) (modified after Ravnik and Rajver, 1998;Sever, 2003). The top of the grout curtain is projected to be at an altitude of 130 m a.s.l.…”

Section: Underground Dam and The Hepp Omblamentioning

confidence: 99%

“…Grouting in karst terrains represents the injection of appropriate materials under pressure into rock through drilled holes to change Cross-section through the system of explored karst caves and large conduits in the vicinity of the Ombla Spring, indicating the location of some key parts of the projected HEPP Ombla, grout curtains and concrete blocks (modified after Ravnik and Rajver, 1998;Sever, 2003).…”

Section: Influence Of the Grout Curtainmentioning

confidence: 99%

“…In practice, the injection pressures used often exceed the maximum recommended values. Figure 8 shows a cross-section through the system of explored karst caves and large conduits in the vicinity of the Ombla Spring, indicating the location of some key parts of the projected HEPP Ombla, the grout curtains and the concrete blocks (modified after Ravnik and Rajver, 1998;Sever, 2003). Attention should be drawn to the fact that three known large active karst conduits will be clogged by concrete packers.…”

Section: Influence Of the Grout Curtainmentioning

confidence: 99%

“…4, two large karst conduits are shown. Ravnik and Rajver (1998) discovered them by measuring groundwater temperatures in 30 deep piezometers drilled from an investigation gallery (gallery 1 in Fig. 4).…”

Section: Influence Of the Grout Curtainmentioning

confidence: 99%

“…Some of these could be reactivated due to the influence of high hydrostatic pressure which will be formed by the grout curtain. Regarding the functioning of the HEPP grout curtain Ravnik and Rajver (1998) have stressed that: "The positions and dimensions of all the basic structural elements of this power plant have now, after 20 yr of interrupted investigations, been outlined.…”

Section: Influence Of the Grout Curtainmentioning

confidence: 99%

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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)

Roje-Bonacci

Bonacci

2013

Nat. Hazards Earth Syst. Sci.

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Abstract. 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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Section: Underground Dam and The Hepp Omblamentioning

confidence: 99%

Section: Influence Of the Grout Curtainmentioning

confidence: 99%

Section: Influence Of the Grout Curtainmentioning

confidence: 99%

Section: Influence Of the Grout Curtainmentioning

confidence: 99%

Section: Influence Of the Grout Curtainmentioning

confidence: 99%

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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)

Roje-Bonacci

Bonacci

2013

Nat. Hazards Earth Syst. Sci.

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Numerical Modelling in Karst

Bojanić¹

2013

Analysis and Modelling of Non‐Steady Flow in Pipe and Channel Networks

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Mass transport triggered by heavy rainfall: the role of endorheic basins and epikarst in a regional karst aquifer

Fidelibus

Balacco

Gioia

et al. 2016

Hydrological Processes

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This study aims at recognizing the mechanisms of mass transport between the karst surface and the saturated zone in a morphostructural relief of the Mesozoic karst carbonate platform of Murgia (Puglia, Southern Italy). The large dimension of the karst aquifer, the regional scale of the flow system, the boundary condition constituted by the sea, and the lack of freshwater springs constrain to the use of wells as monitoring points and limit the study area to the recharge area comprising 986 endorheic basins. The concentrations of non‐reactive tracers (nitrates) in the waters of autogenic recharge (from endorheic basins) have been modeled through the evaluation of effective infiltration, land use, and nitrogen surplus, with reference to a time window, which includes a low precipitation period followed by significant rainfall events. The comparison between the modeled nitrate concentrations and the nitrate concentrations measured in ground waters, coupled with the analysis of groundwater chemograms and records of hydraulic heads (all referred to the same time window), allows inferring the mechanism of mass transport between the karst surface and the groundwater table. The mass transport conceptual model requires the presence of the epikarst. The infiltration of significant rainfall in the endorheic basins after a low precipitation period displaces waters stored in the epikarst toward the saturated zone. Ground waters in the post‐event period show higher concentrations of nitrates, lower concentrations of total organic carbon, and higher Mg/Ca ratios than both those of the pre‐event period and the autumn‐winter recharge period. The post‐event recharge from epikarst storage determines a transient hazard of groundwater pollution with a time lag from the occurrence of the heavy rainfall.

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The use of inverse geotherms for determining underground water flow at the Ombla karst spring near Dubrovnik, Croatia

Cited by 13 publications

References 5 publications

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)

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)

Numerical Modelling in Karst

Mass transport triggered by heavy rainfall: the role of endorheic basins and epikarst in a regional karst aquifer

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