https://www.italy-croatia.eu/web/bluerecharge
Managed aquifer recharge (MAR) methods have been successfully applied in aquifers with intergranular porosity for decades, but their application in fractured and/or karstified aquifers remains marginal. Specific challenges of MAR application in karst aquifers stem from structural and functional complexity of karst, its highly dynamic recharge and discharge behavior, scale effect, the lack of comprehensive and integrative methodologies for investigation, as well as scarce literature and case studies. Despite these challenges, an attempt to investigate MAR feasibility was conducted on the island of Vis, a small and remote island in the central part of the Adriatic Sea. On Vis, favorable geological and hydrogeological situation preconditioned the formation of karst aquifers from which groundwater of excellent quality is abstracted, and the island is autonomous in water supply. Despite this, intensive summer tourism and climate extremes exert high stress on local groundwater resources, occasionally leading to reductions in water supply. Detailed multidisciplinary (e.g., geological, hydrogeological, geophysical, hydrochemical) investigations were conducted during the last decades, resulting in an array of potential solutions to enhance safety and security of the local water supply, including MAR. The conceptual model of MAR is based on the retention of storm/flood water from the hilly areas of Hum in the western part of the island, and their subsequent infiltration through the existing channels in the Korita well field, thus enhancing local groundwater recharge.
Managed Aquifer Recharge (MAR) is emerging as a sustainable solution to enhance water security and protect groundwater resources from climate-induced risks, including salinization and over-extraction. The BLUE RECHARGE project focuses on evaluating the feasibility of using treated wastewater for aquifer recharge in coastal karst aquifers, with special attention to maintaining water quality standards and protecting public health. This presentation will highlight the role of microbiological monitoring, complemented by selected chemical analyses, in ensuring the safety of recharge practices. Routine microbiological testing at key drinking water sources in the Rijeka area and at the Ponikve reservoir sets the baseline for understanding microbial dynamics. Within the BLUE RECHARGE framework, monitoring extends to recharge waters and groundwater samples, focusing on indicators such as E. coli, total coliforms, and somatic coliphages, alongside chemical parameters including total nitrogen, total phosphorus, hydrocarbons, sulfides, and phenols. Emphasis will be placed on the importance of continuous monitoring strategies, especially in light of potential microbial contamination risks and the aquifer's role as a natural barrier. Drawing from international MAR experiences, including the Ezousa aquifer case in Cyprus, and applying Quantitative Microbial Risk Assessment (QMRA) methods, the talk will illustrate how integrated microbiological and chemical monitoring strengthens the resilience of aquifer recharge systems and fosters public trust in water reuse practices.
Radon (²²²Rn), a naturally occurring radioactive gas, is the primary source of ionizing radiation exposure for the general public. This lecture presents the findings from long-term studies of radon in indoor environments, soil gas, and water sources, with focus on the Istrian peninsula. Characterized by karstic geology with porous limestone, Istria provides a complex setting for investigating natural radioactivity. Over 1200 indoor radon measurements were performed at approximately 500 locations, including private homes, kindergartens, and schools, during time period 2013 – 2015 and 2018 – 2019. Elevated concentrations were observed in educational institutions, with 15.5% of kindergartens and 21% of schools exceeding Croatia’s reference level of 300 Bq/m³. Simultaneously, radon in soil gas measurements, by using RM-2 detectors along with RADON-JOK permeability measurements, indicated a high geogenic radon potential (GRP). The results showed average concentrations around 90 kBq/m³ and localized peaks up to 500 kBq/m³. Complementary radon-in-water measurements were conducted by using emanometry (AlphaGUARD and AquaKIT measurement system) and liquid scintillation counting (LSC Tricarb 2900) methods. About 100 water samples from public supplies, private wells, and springs were analyzed, yielding an average radon activity concentration with standard deviation of 3.1 ± 1.2 Bq/L. These results highlight significant spatial variability in radon distribution, strongly influenced by geological and climatic conditions. The findings emphasize the importance of systematic monitoring and provide a scientific foundation for developing radon risk mitigation strategies in karstic regions.
Climate change in the mountainous regions of Croatia leads to measurable phenomena, with extreme events and processes—such as the melting of perennial ice in caves—being particularly evident. These processes affect the dynamic balance of ecosystems and create new challenges in their protection and sustainable management. In the context of climatic and other environmental processes, key questions arise regarding research methodology, the interpretation of results, and their practical application by potential users. Through examples of protected areas as users, we will present ideas and methods of environmental research in mountainous regions, with a special emphasis on determining the impact of climate change on vulnerable ecosystems. We will also highlight the importance of an interdisciplinary approach and its application in nature conservation and the preservation of mountain ecosystems.
Quantifying the effects of climate change on olive cultivation is crucial, as olive orchards are facing increasing sustainability challenges due to shifting climatic conditions. Both temperature and precipitation exert varying impacts on the different developmental stages of this crops and their cultivars. To better understand these impacts, recent trends in phenological stages are assessed and a comprehensive database of bioclimatic indices has been analyzed. This database includes metrics such as the average growing season temperature, growing degree-days (GDD), the Huglin index, the dryness index, and the cool night index, all based on a combination of historical meteorological data and projections from regional climate models (RCMs) sourced from the EURO-CORDEX database. Climate projections for Croatia indicate a trend toward further warming and increased dryness, resulting in earlier olive flowering and fruit ripening. These changes are attributed to increasing mean, minimum, and maximum air temperatures, with the most significant changes occurring in February. Furthermore, a simple GDD model was developed and tested as a prognostic tool to predict the initiation of each phenological stage. The GDD with base temperature of 6 °C proved highly effective in predicting the entire flowering period. The developed GDD model shows strong potential for projecting the onset of olive flowering under future climate conditions in Istria.
Mathematical models of marine primary production have been around for quite a while in oceanography. They are typically built on biophysical principles, capturing how light drives the rate of carbon uptake through photosynthesis. In this talk, a different angle is explored, and marine primary production is looked at through the lens of economic theory. This is possible due to the strong mathematical parallels between biophysical and economic models, which opens the door to some interesting reinterpretations. By applying economic thinking, we offer a bioeconomic take on classical primary production models and introduce a set of new indicators for primary production. These indicators help describe and quantify the response of primary production to stochastic forcing and explain under which conditions marine primary production is fragile, or antifragile. Finally, we reflect on the broader significance of this approach, pointing out examples in the literature where bridging ideas from economics and production modelling could lead to valuable insights on both sides.
Focused on resilience and abrupt shifts in marine ecosystems, this project uses European Space Agency satellite climate-quality data to analyse phytoplankton productivity subtropical gyre anomalies, food chain efficiency, and coral reef stability, among other factors. TIME will combine satellite-based indicators with in situ measurements and ecological models to better understand the resilience of marine systems. Central to the effort is the Ocean Colour Climate Change Initiative (OC-CCI) time series, which will serve as a primary satellite data source. The team plans to refine methods for monitoring ecological stability and for detecting signs of abrupt change, focusing on interactions within marine ecosystems and their response to external pressures like climate change. While threats to ocean health are well known, TIME seeks to address critical gaps in how satellite data are used to monitor long-term trends and system vulnerabilities.
Effective water management is essential for meeting ecological and societal needs, but challenges arise due to processes that transcend hydrological boundaries. This study examines telecouplings—long-distance effects on local water resources—focusing on three types: long-distance water transfers, impacts of international tourists, and virtual water volumes from international trade. Using case studies from Germany and Croatia, the research employs the telecoupling framework to analyze how these flows alter local water balances. The study uses water consumption statistics, groundwater recharge estimates, and trade data to quantify these impacts. Findings reveal both positive and negative effects of telecoupling flows. Long-distance water transfers can balance water deficits and surpluses, but they also pose risks to local water security. International tourists may increase water consumption in arid regions, while trade-related food consumption patterns can strain groundwater resources in irrigation-dependent areas. The study highlights the dual nature of telecouplings, emphasizing the need for a holistic approach in water management. It advocates for incorporating telecoupling effects into strategies, identifying intervention points to mitigate adverse impacts and enhance sustainability. This broader perspective is crucial for developing adaptive and resilient water management practices that address the dynamic and interconnected nature of water systems.
https://www.italy-croatia.eu/web/crescoadria
Climate change is no longer a threat for the future, it is the reality in which we already live. Humanity's (co-)existence with its consequences is becoming increasingly clear and requires an understanding of the changes affecting the natural systems on which we depend. Aquatic ecosystems are particularly sensitive to climate pressures, and organisms such as fish and bivalves are among the first to feel the consequences of these changes. Climate change is putting increasing pressure on freshwater and marine ecosystems. Fish and bivalves show a range of physiological, immunological and behavioural responses to changing environmental conditions. Increased water temperatures, hypoxia, altered precipitation patterns, the increasing frequency of extreme weather events and ocean acidification all have cumulative and often synergistic effects on aquatic species, affecting their distribution, reproduction, growth and survival. In addition, climate change affects disease dynamics, rising temperatures, changes in salinity and oxygen depletion favour the spread of various bacterial and parasitic pathogens and increase the health risk to fish and bivalve populations, especially in intensive aquaculture systems.Based on examples from the scientific literature and current events in the Adriatic region, the most important stress reactions of fish and bivalves to climate-induced environmental changes are shown, with a special focus on species that are economically important for the Republic of Croatia.
Maritime common good, its subcomponents and sub layers, as well as its simultaneous classification into different classes of economic goods in the framework of modern economic theories, confirm its complexity and integrity. In the same time, strong and growing pressures on coastal commons, as well as growing concerns, are coming from different focal points (tourism, real estate business and construction, fisheries, preservation and protection, entrepreneurship, transportation, etc.) and different stakeholder groups (private, public, NGOs, SMEs, etc.) with different motivations and often conflicting goals (profit vs. protection, sustainability vs. exploitability, preservations vs. appropriation, economic diversification vs exclusive focus on tourism, etc.). This is all happening in the evolving international, as well as national, institutional frameworks, but even the governing (formal) institutional frameworks can be in collision, especially when addressing fundamental governing approaches aiming to achieve long term efficient and sustainable Integrated Coastal Zone Management. So, there is an evident and strong need to comprehensively address all those conflicting aspects and complex interactions in order to test and propose tailored made governing solutions able to improve integrated coastal zone management and coastal commons governance.