Hydrogeological estimation of brackish groundwater lens on a small Dinaric karst island: Case study of Ilovik, Croatia

Terzić, Josip; Grgec, Damir; Reberski, Jasmina Lukač; Selak, Ana; Boljat, Ivana; Filipović, Marina

doi:10.1016/j.catena.2021.105379

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…This aquifer is very heterogeneous, and consists of voids of different scales that are interconnected by fractures, cracks, and even karst conduits (Figure 5a,b). Similar examples have been recorded in comparable environments [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48].…”

supporting

confidence: 69%

Hydrogeological Assessment and Modified Conceptual Model of a Dinaric Karst Island Aquifer

Terzić

Frangen

Borović

et al. 2022

Water

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Vis Island is situated in southern Croatia. The island is mostly composed of karstified carbonate rocks and belongs to the Dinaric karst region, which is a locus typicus of karst landforms. Located far from the mainland, Vis island has maintained a successful water supply from its own karst aquifer for decades. Hydrogeological research has been undertaken to protect this excellent karst aquifer by establishing sanitary protection zones and to explore the possibility of increasing the pumping yield. New groundwater velocity data obtained via a tracer test were in accordance with the rock mass hydraulic conductivity calculated from previous pumping tests. The hydrochemical interpretation indicated several different phenomena, from carbonate and sulfate rock dissolution to seawater mixing with groundwater. A conceptual model of the island’s aquifer was improved, and two main catchments were delineated according to tracer test results, and connected with the geological setting, hydrochemical data, and new climatological insights. Such an approach is applicable for similar karst aquifers, in which topographic and hydrogeological divides usually do not coincide.

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supporting

confidence: 69%

Hydrogeological Assessment and Modified Conceptual Model of a Dinaric Karst Island Aquifer

Terzić

Frangen

Borović

et al. 2022

Water

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“…However, there are also occurrences of flank margin caves [32] connected to the island freshwater or brackish water lenses. In the Adriatic area, numerous freshwater and brackish groundwater lenses have been documented on islands [33], even on small Dinaric karst islands [34]. However, such freshwater or brackish groundwater lenses have not been documented on the island of Biševo [33].…”

Section: Discussionmentioning

confidence: 99%

Tectonic Influence on Speleogenesis of Sea Caves on Biševo Island (UNESCO Global Geopark Vis Archipelago, Adriatic Sea, Croatia)

Mišur¹,

Budić²,

Kurečić³

et al. 2021

Geosciences

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A geological and speleological investigation was conducted in the famous Blue Cave (Modra špilja) and the Monk Seal Cave (Medvidina špilja) on Biševo Island (Croatia) to promote the island’s geoheritage through the new Visitor Centre. The island is mainly composed of Cretaceous to Paleogene neritic carbonates, which form the bedrock, whereas parts of the island are covered with thin Quaternary sediments. The caves are of small dimensions and a simple layout, composed of the main channel and few shorter side channels, all positioned in the tidal zone. Thus, the caves are semi-submerged sea caves located along the coastline. The Blue Cave and the Monk Seal Cave developed within the bedrock limestones and dolostones, respectively, within a zone of left-lateral NNE–SSW striking strike-slip faults that belong to the Biševo fault system. Conjugated discontinuities within the carbonate bedrock indicate a specific strike-slip tectonic regime. Additionally, the host rocks were probably also deformed and fractured during the rise of salt diapirs that characterise this part of the Adriatic foreland. Tectonic and bedding discontinuities form the fragments of the host rock, that combined with the impacts of the strong southern waves, significantly influenced the genesis of the caves.

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“…Freshwater bodies are influenced by dynamic groundwater, especially in coastal karst terrains, where seawater is connected. Seawater intrusions into the coastal Dinaric karst aquifers are investigated on the islands on the Dalmatian coast [120,121]. The groundwater table declines towards the sea, and freshwater overlies saltwater, penetrating the aquifer at a certain depth, in a wedge-like form.…”

Section: Paleoenvironmental Reconstructions Of Lake Velo Blato and Wetlands Malo And Kolanjsko Blatomentioning

confidence: 99%

“…Since the Ghyben-Herzberg law describes the sharp interface contact of two fluids (freshwater and seawater), in natural conditions-due to the groundwater dynamics, chemical mixing, and tide effects-that contact is not sharp, and the model can be taken only as a rough estimation. A relatively wide transition (or mixing) zone is formed between freshwater and seawater, making part of the aquifer brackish [121]. Although the Island of Pag is one of the largest Adriatic karst islands, most aquifers are separated and relatively small due to their high indentation.…”

Section: Paleoenvironmental Reconstructions Of Lake Velo Blato and Wetlands Malo And Kolanjsko Blatomentioning

confidence: 99%

A Holocene Sedimentary Record and the Impact of Sea-Level Rise in the Karst Lake Velo Blato and the Wetlands on Pag Island (Croatia)

Ilijanić

Miko

Filipović

et al. 2022

Water

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Lakes in coastal lowland areas represent a critically vulnerable environment as a transitional space between freshwater and seawater environments. The paleoenvironmental reconstruction and anthropogenic impact are assessed through the lake sediment cores from Velo, Malo, and Kolanjsko Blato using multi-proxy analyses (sedimentological, mineralogical, geochemical, 137Cs and ostracod analyses, and AMS 14C radiocarbon dating). The freshwater lake Velo Blato was formed at 8100 cal yr BP due to rising groundwater levels as a consequence of sea-level rise. The brackish conditions in Lake Velo Blato started at 7100 cal yr BP, giving the index point for the sea-level curve of 7-m lower than present. Lead concentrations showed slightly increased values in the last 1800 cal yr BP, while the spike in Malo Blato lake sediments probably derived from bird hunting with lead bullets. Kolanjsko Blato sediment core archives the sediment record of the last 2050 years, which represents a shallow brackish coastal wetland under marine influence. Enrichment factors showed the accumulation of Cu, Hg, P, Pb, S, and Zn in the sediments from Kolanjsko Blato in the last 650 cal yr BP, which coincides with the high organic carbon content, and in sediments from Malo Blato after the lake’s formation (from the depth of 20 cm upwards). Anthropogenic Cu introduced into the Kolanjsko Blato sediments is the highest in the surface sample. Surficial sediments from Velo Blato are characterized by the high organic carbon, S, P, and N content, indicating high productivity and eutrophication which led to occasional anoxic conditions on the lake bottom in the last 200 years.

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Hydrogeological estimation of brackish groundwater lens on a small Dinaric karst island: Case study of Ilovik, Croatia

Cited by 8 publications

References 28 publications

Hydrogeological Assessment and Modified Conceptual Model of a Dinaric Karst Island Aquifer

Hydrogeological Assessment and Modified Conceptual Model of a Dinaric Karst Island Aquifer

Tectonic Influence on Speleogenesis of Sea Caves on Biševo Island (UNESCO Global Geopark Vis Archipelago, Adriatic Sea, Croatia)

A Holocene Sedimentary Record and the Impact of Sea-Level Rise in the Karst Lake Velo Blato and the Wetlands on Pag Island (Croatia)

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