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Application of a 2D-Hydrodynamic Model to Assess the Impact of Spring Water Discharge into the Lake Pamvotida in Ioannina, Greece
(2025-11-25)
K. Zachopoulos
;
D. Papadimos
According to the study conducted by the Greek Biotope Wetland Centre for the assessment of the minimum water level requirements of Lake Pamvotida, its water level (WL) should be maintained within the specified range of 469.10 - 468.20 m, a.m.s.l. However, the lake is very susceptible to larger reductions in its WL in late summer (below the proposed water level of 468.20 m) due to increased evaporation and over-pumping for irrigation purposes. This study investigates the introduction of freshwater from the Sentenikos and Kalithea Springs into Lake Pamvotida in order to mitigate the decrease in its water level (WL), during the dry season. A 2-D hydrodynamic modelling system was used to evaluate the effects of three scenarios in which the existence and location of the spring discharge inflow are differentiated. WL, temperature (T), dissolved oxygen (DO) and biochemical oxygen demand (BOD) were used for the evaluation of the effect of the scenarios on the lake’s condition. The research showed a significant change on the WL fluctuation of the lake, and only minor effects locally dispersed regarding on its temperature, DO and BOD.
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Application of a 2D-Hydrodynamic Model to Assess the Impact of Spring Water Discharge into the Lake Pamvotida in Ioannina, Greece (Poster Presentation)
(2025-11-25)
K. Zachopoulos
;
D. Papadimos
The Greek Biotope Wetland Centre conducted a study to assess the minimum water level (WL) requirements of Lake Pamvotida, which should be maintained within the range of 469.10-468.20m, a.m.s.l. However, the lake is susceptible to larger reductions in its water level in late summer due to increase devaporation and over-pumping for irrigation. The study investigated the introduction of freshwater from Sentenikos and Kalithea Springs into Lake Pamvotida to mitigate the decrease in its water level during the dry season. The results revealed a notable alteration in the lake’s water level fluctuations, accompanied by measurable impacts on Temperature and Biochemical Oxygen Demand (BOD).
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Establishing Total Phosphorus Boundaries to Support Good Ecological Status of Greek Lakes and Reservoirs in Accordance with the Water Framework Directive
(2025-11-24)
M. Zioga
;
D. Kemitzoglou
;
I. Zerva
;
S. Katsavouni
;
I.Kagalou
Eutrophication, driven by nutrient enrichment, represents substantial anthropogenic pressure with harmful consequences for aquatic ecosystems. TheWater Framework Directive provides a structured approach to addressing this challenge as it requires European Union Member States to achieve at least good ecological status for their surface waters. The establishment of realistic nutrient boundaries, above which negative effects become pronounced, is essential to guide regulatory intervention aimed at securing long-term water sustainability in Europe. Greece is one of the Member States which should determine nutrient boundaries supporting the good ecological status of lakes. Two statistical approaches, ranged major axis regression and binomial logistic regression, were applied for setting appropriate nutrient boundaries for Greek natural lakes and reservoirs, using datasets of phytoplankton and total phosphorus concentrations, retrieved from the national monitoring program (2016–2023). The predicted boundary values for total phosphorus supporting good ecological status ranged from 32 to 76 μg/L, with stricter boundaries corresponding to deep lakes. Nutrient boundaries that reflect the environmental pressures on Greek natural lakes and reservoirs are fundamental to ensure proper design of lake management strategies.
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Assessment of minimum ecological water requirements in Lake Pamvotida – Greece, using an adaptation of the IFIM method
(2025-11-24)
D. Papadimos
Human interventions and climate change in the Greek territory, so far accompanied by higher temperatures and reduced precipitations, are already exerting pressure on the water level (WL) of the lakes (Papadimos et al., 2022). The severity of the impact of the above pressures on lake ecosystems depends on the magnitude of their WL changes, the duration, the timing of their occurrence during the year and the organisms that occur in the ecosystem (Leira and Cantonati 2008). Therefore, the identification of the ecological water level requirements (EWLR) of the lakes should be considered both necessary and imperative for the conservation and protection of their ecosystems and the services they provide. A variety of methodological approaches have been used to estimate EWLR in lakes. Among them hydraulic models, combination of historical WL data and the ecological requirements at different life stages of aquatic macrophytes, the protection requirements of specific aquatic flora and fauna species sensitive to hydrological pressures etc. In this research, we have used an adaptation of the Instream Flow Incremental Method (IFIM, Bovee 1982), which has been mainly applied to streams and rivers, to assess the EWLR of Lake Pamvotida, on the basis of the requirements of its habitat types and species whose conservation depends directly or indirectly on water regime. In addition, justified management measures related to the water balance of the lake have been elaborated and proposed to support the EWLR.
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Assessment of minimum ecological water requirements in Lake Pamvotida – Greece, using an adaptation of the IFIM method (Oral Presentation)
(2025-11-24)
D. Papadimos
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Spatio-temporal changes of littoral macrophytes along hydrological conditions in Yliki, a Greek lake
(2025-11-24)
E. Mavromati
;
V. Giourieva
;
D. Papadimos
;
A. Apostolakis
;
V. Tsiaoussi
Human-induced changes in hydrological conditions seem to be among the main factors affecting ecological relationships in lakes (Zhao et al., 2021). Water level fluctuation (WLF), which is often attributed to anthropogenic activities and its amplitude variations can have an impact on aquatic plant communities by altering several key environmental factors (Hill et al., 1998, Zhao et al., 2021). These fluctuations influence water depth, underwater irradiance, water quality, and dissolved oxygen levels, all of which play crucial roles in the growth and survival of macrophytes (Li et al., 2017). The interplay of these factors can significantly change the growing conditions for several macrophyte species over time. To overcome this, macrophytes have evolved to adjust gradually to periodic WLF over time, as part of their long-term evolutionary process (Zhao et al., 2021). The aims of the study are to present the results of WLF over time in Lake Yliki, study its aquatic plant community and explore the effect of WLFs on macrophytes.
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Spatio-temporal changes of littoral macrophytes along hydrological conditions in Yliki, a Greek lake (Presentation)
(2025-11-18)
E. Mavromati
;
V. Giourieva
;
D. Papadimos
;
A. Apostolakis
;
V. Tsiaoussi
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Ostracod-based environmental reconstruction of Lake Koronia, (Central Greece) during the Holocene
(2025-09-01)
Lake Koronia is located in the western lowland area of the Mygdonia Basin, northeast of the city of Thessaloniki in northern Greece (40° 41′ N, 23° 09′ E, 75 m a.s.l.). It is the remnant of a once larger lake in the region (Psilovikos, 1977), but is now a shallow, hypertrophic and heavily polluted water body (Moustaka-Gouni et al., 2012). It has experienced substantial degradation over time due to human activities, but has also dried up several times in the past two decades (2002, 2007, 2009 and 2014), resulting in its current state, formerly the fourth largest lake in Greece (Demertzioglou et al., 2022). Despite its current ecological challenges, Lake Koronia is recognized as a protected wetland under international and national legislation, highlighting its importance (Malamataris et al., 2017). The aim of the present study was to investigate the paleoenvironmental evolution of Lake Koronia and the distribution of ostracod assemblages through time using a combination of core and recent surface sediment samples.
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Lake phytoplankton status and trends: a case study from Greek lakes, Eastern Mediterranean
(2025-06-06)
Until now, little information was available regarding phytoplankton communities of Greek lakes. In this study, we present the first comprehensive analysis of phytoplankton composition and biovolume, as well as their inter-annual variations, across 15 natural lakes in Greece from 2016 to 2021. The ecological status and trends of these lakes were assessed using HeLPhy, a phytoplankton index of the Water Framework Directive (WFD). Additionally, this study examined potential similarities among lakes based on the number of phytoplankton taxa identified, the composition of phytoplankton communities, and the ecological classification. A total of 462 phytoplankton taxa from 10 taxonomic groups were recorded in 287 phytoplankton samples collected between 2016 and 2021. The phytoplankton communities in all lakes were dominated mainly by Cyanobacteria, Bacillariophyta, and Chlorophyta. The highest number of phytoplankton taxa was recorded in Chlorophyta and Cyanobacteria taxonomic groups. Based on the HeLPhy index, the lakes were classified into four ecological status classes: high, good, moderate, and poor. Inter-annual variations in ecological classification were observed. Eight of the 15 lakes were classified as having good or better ecological status according to WFD criteria, with deep lakes generally exhibiting a better status than shallow lakes. Bacillariophyta were more prevalent in lakes with high and good ecological status, while Cyanobacteria were more abundant in poor status lakes and dominated in bad status lake-years. Lakes in moderate and poor status exhibited higher total phytoplankton and Cyanobacteria biovolume values. This research improves our understanding of the status and temporal variations of phytoplankton communities in Greek lakes.
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Bathymetry and morphometric analysis of Greek natural lakes through a hybrid GIS-acoustic methodology
(2025-04-03)
T. Perivolioti
;
A. Apostolakis
;
D. Papadimos
;
V. Tsiaoussi
Homogeneous and up-to-date bathymetric information on lakes is essential to improve limnological knowledge and produce evidence-based lake monitoring, assessment methods, and river basin management plans according to Water Framework Directive (WFD). The present study focused on the production of updated bathymetric information on the main natural Greek lakes and their morphometric analysis. The aim was to address the knowledge gap by providing updated homogeneous and accurate bathymetric information for the main freshwater natural lakes of Greece as part of the National Monitoring Network of Lakes in the context of WFD. We surveyed 14 freshwater lakes in mainland Greece using a dual frequency echosounder. Using the acoustic data collected during the surveys, bathymetric digital terrain models (DTMs) were produced for each lake and used to estimate morphometric characteristics (mean/ maximum depth, volume, lake depth ratio, volume development, mean lake diameter, relative depth ratio, shoreline development factor, hypsographic curve). This analysis demonstrated the potential of the morphometric approach to generate valuable information using up-to-date bathymetric DTMs. The geospatial data derived by the present study are available through an online repository, the Greek National Monitoring Network of Lakes (http://ekbygis.biodiversity-info.gr/geoserver/web/). These data provide a valuable database for the advancement of limnological knowledge, the implementation of comprehensive monitoring programmes, and informed decision making in water resources management.

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