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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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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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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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Assessing Lake Response to Extreme Climate Change Using the Coupled MIKE SHE/MIKE 11 Model: Case Study of Lake Zazari in Greece
(2022-03-28)
D. Papadimos
Lakes, either artificial or natural, are greatly important as a component in their catchments’ hydrology, but also as ecosystem service providers. However, due to climate change, they have begun to face numerous problems with their water quality and quantity. Furthermore, general circulation models (GCMs) show future climate change with a reduction in rainfall and increase in temperature. The aim of the current study is to present an application where GCMs and state-of-the-art hydrological modelling system MIKE SHE/MIKE 11 are combined for assessing the response of a Greek lake in terms of its water balance and water level under climate change. Four general circulation models (GCMs; GFDL-CM3, MIROC-ESM-CHEM, MIROC-ESM, IPSL-CM5A-LR) for the extreme climate change scenario of RCP8.5 were used in the basin of Lake Zazari in Greece as a case study. Results showed that, by keeping the irrigated demands (the main water user) unchanged in the future, the lake exhibited a lower water level for all GCMs, fluctuating from −0.70 to −1.8 m for the mean (min)water level and from −0.30 to −1.20 m for the mean (max) water level. Instead of the above and by preserving the amount of withdraw water n from the lake at a certain percentage of inflows, the irrigated area should be reduced from 54.1% to 64.05% depending on the circulation model.
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A Simplistic Approach for Assessing Hydroclimatic Vulnerability of Lakes and Reservoirs with Regulated Superficial Outflow
(2019-07-24)
K. Demertzi
;
D. Papadimos
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V. Aschonitis
;
D. Papamichail
This study proposes a simplistic model for assessing the hydroclimatic vulnerability of lakes/reservoirs (LRs) that preserve their steady-state conditions based on regulated superficial discharge (Qd) out of the LR drainage basin. The model is a modification of the Bracht-Flyr et al. method that was initially proposed for natural lakes in closed basins with no superficial discharge outside the basin (Qd = 0) and under water-limited environmental conditions {mean annual ratio of potential/reference evapotranspiration (ETo) versus rainfall (P) greater than 1}. In the proposed modified approach, an additional Qd function is included. The modified model is applied using as a case study the Oreastiada Lake, which is located inside the Kastoria basin in Greece. Six years of observed data of P, ETo, Qd, and lake topography were used to calibrate the modified model based on the current conditions. The calibrated model was also used to assess the future lake conditions based on the future climatic projections (mean conditions of 2061-2080) derived by 19 general circulation models (GCMs) for three cases of climate change (three cases of Representative Concentration Pathways: RCP2.6, RCP4.5 and RCP8.5). The modified method can be used as a diagnostic tool in water-limited environments for analyzing the superficial discharge changes of LRs under di erent climatic conditions and to support the design of new management strategies for mitigating the impact of climate change on (a) flooding conditions, (b) hydroelectric production, (c) irrigation/industrial/domestic use and (d) minimum ecological flows to downstream rivers. Hydrology 6(3), 61. https://doi.org/10.3390/hydrology6030061
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Assessing lake vulnerability to climate change using the coupled MIKE SHE/MIKE 11 model: Case study of Lake Zazari in Greece. Paper presented at 11th World Congress on Water Resources and Environment (EWRA 2019) “Managing Water Resources for a Sustainable Future”. Madrid, Spain, 25-29 June 2019
(2019-07-04)
D. Papadimos
If the worst predictions of general circulation models (GCMs) about climate change become true, then lakes will hardly manage to maintain their current conditions (Zhang et al. 2016) especially in regions, which have been identified as climate change hot spots such as the countries of Mediterranean Basin (Loizidou et al. 2016) from which Greece is of special interest since it has 54 lakes/reservoirs of 0.5 km2 minimum size. The hydrological models are important tools for assessing the water balance components of lakes and for supporting the design of water management strategies. Depending on the modelling purposes and the specific attributes of a lake, different types of models and different levels of model complexities can be selected, starting from complex models such as MIKE SHE (Abbott et al. 1986), WATLAC (Zhang 2011) or using simpler methods (Yang et al. 2018). The MIKE model is among the most integrated models and has been used in the past for similar cases (Singh et al. 2010), while in combination with the future climate projections of general circulation models (GCMs), can be used to investigate lake conditions under future climate scenarios. The aim of this study is to present an application for analyzing the vulnerability of a lake to climate change using the MIKE SHE/11 model using as a case study the Lake Zazari in Greece.

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