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Nikos Charizopoulos
Region of Sterea Ellada, Kalivion 2, 351 32 Lamia, Greece

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Journal article
Published: 01 April 2021 in Sustainability
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Nature-based solutions (NBS) are being deployed around the world in order to address hydrometeorological hazards, including flooding, droughts, landslides and many others. The term refers to techniques inspired, supported and copied from nature, avoiding large constructions and other harmful interventions. In this work the development and evaluation of an NBS applied to the Spercheios river basin in Central Greece is presented. The river is susceptible to heavy rainfall and bank overflow, therefore the intervention selected is a natural water retention measure that aims to moderate the impact of flooding and drought in the area. After the deployment of the NBS, we examine the benefits under current and future climate conditions, using various climate change scenarios. Even though the NBS deployed is small compared to the rest of the river, its presence leads to a decrease in the maximum depth of flooding, maximum velocity and smaller flooded areas. Regarding the subsurface/groundwater storage under current and future climate change and weather conditions, the NBS construction seems to favor long-term groundwater recharge.

ACS Style

Christos Spyrou; Michael Loupis; Νikos Charizopoulos; Ilektra Apostolidou; Angeliki Mentzafou; George Varlas; Anastasios Papadopoulos; Elias Dimitriou; Depy Panga; Lamprini Gkeka; Paul Bowyer; Susanne Pfeifer; Sisay Debele; Prashant Kumar. Evaluating Nature-Based Solution for Flood Reduction in Spercheios River Basin under Current and Future Climate Conditions. Sustainability 2021, 13, 3885 .

AMA Style

Christos Spyrou, Michael Loupis, Νikos Charizopoulos, Ilektra Apostolidou, Angeliki Mentzafou, George Varlas, Anastasios Papadopoulos, Elias Dimitriou, Depy Panga, Lamprini Gkeka, Paul Bowyer, Susanne Pfeifer, Sisay Debele, Prashant Kumar. Evaluating Nature-Based Solution for Flood Reduction in Spercheios River Basin under Current and Future Climate Conditions. Sustainability. 2021; 13 (7):3885.

Chicago/Turabian Style

Christos Spyrou; Michael Loupis; Νikos Charizopoulos; Ilektra Apostolidou; Angeliki Mentzafou; George Varlas; Anastasios Papadopoulos; Elias Dimitriou; Depy Panga; Lamprini Gkeka; Paul Bowyer; Susanne Pfeifer; Sisay Debele; Prashant Kumar. 2021. "Evaluating Nature-Based Solution for Flood Reduction in Spercheios River Basin under Current and Future Climate Conditions." Sustainability 13, no. 7: 3885.

Journal article
Published: 31 January 2021 in Water
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Dam breach has disastrous consequences for the economy and human lives. Floods are one of the most damaging natural phenomena, and some of the most catastrophic flash floods are related to dam collapses. The goal of the present study is to analyse the impact of a possible failure–collapse on a potentially affected area downstream of the existing Bramianos dam on southern Crete Island. HEC-RAS hydraulic analysis software was used to study the dam breach, the flood wave propagation, and estimate the extent of floods. The analysis was performed using two different relief datasets of the same area: a digital elevation model (DEM) taken from very high-resolution orthophoto images (OPH) of the National Cadastre and Mapping Agency SA and a detailed digital surface model (DSM) extracted from aerial images taken by an unmanned aerial vehicle (UAV). Remote sensing data of the Sentinel-2 satellite and OPH were utilised to create the geographic information system (GIS) layers of a thorough land use/cover classification (LULC) for the potentially flooded area, which was used to assess the impact of the flood wave. Different dam breach and flood scenarios, where the water flows over man-made structures, settlements, and olive tree cultivations, were also examined. The study area is dominated mainly by three geological formations with different hydrogeological characteristics that dictated the positioning and structure of the dam and determine the processes that shape the geomorphology and surface roughness of the floodplain, affecting flow conditions. The results show that the impact of a potential dam break at Bramianos dam is serious, and appropriate management measures should be taken to reduce the risk. The water flow downstream of the collapsed dam depends on the water volume stored in the reservoir. Moreover, the comparison of DSM and DEM cases shows that the detailed DSM may indicate more accurately the surface relief and existing natural obstacles such as vegetation, buildings, and greenhouses, enabling more realistic hydraulic simulation results. Dam breach flood simulations and innovative remote sensing data can provide valuable outcomes for engineers and stakeholders for decision-making and planning in order to confront the consequences of similar incidents worldwide.

ACS Style

Emmanouil Psomiadis; Lefteris Tomanis; Antonis Kavvadias; Konstantinos Soulis; Nikos Charizopoulos; Spyros Michas. Potential Dam Breach Analysis and Flood Wave Risk Assessment Using HEC-RAS and Remote Sensing Data: A Multicriteria Approach. Water 2021, 13, 364 .

AMA Style

Emmanouil Psomiadis, Lefteris Tomanis, Antonis Kavvadias, Konstantinos Soulis, Nikos Charizopoulos, Spyros Michas. Potential Dam Breach Analysis and Flood Wave Risk Assessment Using HEC-RAS and Remote Sensing Data: A Multicriteria Approach. Water. 2021; 13 (3):364.

Chicago/Turabian Style

Emmanouil Psomiadis; Lefteris Tomanis; Antonis Kavvadias; Konstantinos Soulis; Nikos Charizopoulos; Spyros Michas. 2021. "Potential Dam Breach Analysis and Flood Wave Risk Assessment Using HEC-RAS and Remote Sensing Data: A Multicriteria Approach." Water 13, no. 3: 364.

Journal article
Published: 21 September 2020 in Geosciences
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Morphometric analysis can be used to investigate catchment dynamics and tectonic processes responsible for the development of drainage catchments and to support flood risk assessment. In this study, a comparative GIS-based morphometric analysis between the main southern and northern sub-catchments of the Sperchios River basin, Central Greece, was performed, using geospatial and remote sensing data. The goal was to investigate their correlation with the peculiar geotectonic activity and the frequent flash-flood events that occur in the river floodplain. All sub-catchments characteristics are linked with the geological formation types of the area, in combination with ongoing tectonic activity. The results indicate that drainage network development is significantly controlled by the region’s overall tectonic activity. The morphometric characteristics—i.e., bifurcation ratio, drainage density, circularity ratio, elongation ratio and water concentration–time values, reflect the flood-prone character of the southern part of Sperchios River catchment in comparison to the northern part, especially during intense rainfall events. The study can provide valuable insight into identifying how morphometric characteristics are associated with increased flood hazard.

ACS Style

Emmanouil Psomiadis; Nikos Charizopoulos; Konstantinos Soulis; Nikolaos Efthimiou. Investigating the Correlation of Tectonic and Morphometric Characteristics with the Hydrological Response in a Greek River Catchment Using Earth Observation and Geospatial Analysis Techniques. Geosciences 2020, 10, 377 .

AMA Style

Emmanouil Psomiadis, Nikos Charizopoulos, Konstantinos Soulis, Nikolaos Efthimiou. Investigating the Correlation of Tectonic and Morphometric Characteristics with the Hydrological Response in a Greek River Catchment Using Earth Observation and Geospatial Analysis Techniques. Geosciences. 2020; 10 (9):377.

Chicago/Turabian Style

Emmanouil Psomiadis; Nikos Charizopoulos; Konstantinos Soulis; Nikolaos Efthimiou. 2020. "Investigating the Correlation of Tectonic and Morphometric Characteristics with the Hydrological Response in a Greek River Catchment Using Earth Observation and Geospatial Analysis Techniques." Geosciences 10, no. 9: 377.

Journal article
Published: 15 September 2020 in ISPRS International Journal of Geo-Information
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Landslides can cause severe problems to the social and economic well-being. In order to effectively mitigate landslide hazards, the development of detailed susceptibility maps is required, towards implementing targeted risk management plans. This study aims to create detailed landslide susceptibility (LS) and landslide risk (LR) maps of the Sperchios River basin by applying an expert semi-quantitative approach that integrates the Geographic Information Systems (GIS)-based multicriteria analysis and Earth Observation (EO) data. Adopting the analytic hierarchy process (AHP) for a weighted linear combination (WLC) approach, eleven evaluation parameters were selected. The results were validated using a historic landslide database, enriched with new landslide locations mapped by satellite and aerial imagery interpretation and field surveys. Moreover, the landslide risk map of the area was also developed, based on the LS delineation, considering additionally the anthropogenic exposure and overall vulnerability of the area. The results showed that the most susceptible areas are located at the west and south-west regions of the basin. The synergistic use of GIS-based analysis and EO data can provide a useful tool for the design of natural hazards prevention policy at highly susceptible to risk landslide risk areas.

ACS Style

Emmanouil Psomiadis; Nikos Charizopoulos; Nikolaos Efthimiou; Konstantinos X. Soulis; Ioannis Charalampopoulos. Earth Observation and GIS-Based Analysis for Landslide Susceptibility and Risk Assessment. ISPRS International Journal of Geo-Information 2020, 9, 552 .

AMA Style

Emmanouil Psomiadis, Nikos Charizopoulos, Nikolaos Efthimiou, Konstantinos X. Soulis, Ioannis Charalampopoulos. Earth Observation and GIS-Based Analysis for Landslide Susceptibility and Risk Assessment. ISPRS International Journal of Geo-Information. 2020; 9 (9):552.

Chicago/Turabian Style

Emmanouil Psomiadis; Nikos Charizopoulos; Nikolaos Efthimiou; Konstantinos X. Soulis; Ioannis Charalampopoulos. 2020. "Earth Observation and GIS-Based Analysis for Landslide Susceptibility and Risk Assessment." ISPRS International Journal of Geo-Information 9, no. 9: 552.

Journal article
Published: 25 May 2019 in Comptes Rendus Geoscience
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The morphometric analysis of alluvial drainage provides insights into its dynamics, erosion capacity, susceptibility to floods and possible genetic relations to tectonic faulting. In this study, we analysed the drainage system of Samos Island, located in the northern Aegean Sea. The results indicate a vulnerability to erosion and flooding events, and these intense phenomena concentrate mostly on third-order catchments. Two dissimilar drainage network systems are shown: an older drainage network system with a main NW–SE direction, which includes fourth- and fifth-order branches, and a recent drainage network system, which includes new, smaller order branches with a main NE–SW direction. The major tectonic fault orientations are NNW–SSE. The branches of the hydrographic network and faults present different directions, which indicates that the hydrographic pattern is not affected by tectonics.

ACS Style

Nikos Charizopoulos; Panagiotis Mourtzios; Thomas Psilovikos; Aris Psilovikos; Lina Karamoutsou. Morphometric analysis of the drainage network of Samos Island (northern Aegean Sea): Insights into tectonic control and flood hazards. Comptes Rendus Geoscience 2019, 351, 375 -383.

AMA Style

Nikos Charizopoulos, Panagiotis Mourtzios, Thomas Psilovikos, Aris Psilovikos, Lina Karamoutsou. Morphometric analysis of the drainage network of Samos Island (northern Aegean Sea): Insights into tectonic control and flood hazards. Comptes Rendus Geoscience. 2019; 351 (5):375-383.

Chicago/Turabian Style

Nikos Charizopoulos; Panagiotis Mourtzios; Thomas Psilovikos; Aris Psilovikos; Lina Karamoutsou. 2019. "Morphometric analysis of the drainage network of Samos Island (northern Aegean Sea): Insights into tectonic control and flood hazards." Comptes Rendus Geoscience 351, no. 5: 375-383.

Original article
Published: 18 May 2018 in Environmental Earth Sciences
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In Scopia basin, central Greece, a hydrochemical investigation was completed. Groundwater samples from 41 sites were used to assess the natural and anthropogenic impacts in groundwater, utilizing the principal component analysis (PCA) involved with the inverse distance weighted (IDW) interpolation modeling and hierarchical cluster analysis (HCA). Best fit model to explain the spatial distribution of both hydrochemical parameters and PCA was chosen by optimizing the IDW interpolator’s parameters. Precision of the model was picked based on less root-mean-squared prediction error (RMSPE) amongst predicted and actual values measured at the same locations. Groundwater exhibit Ca–Mg–HCO3 as the dominant hydrochemical type and their greater part are mixed waters with non-dominant ion. Interpolation models demonstrate high estimations of nitrates in zones with agricultural activities and high estimations of nickel and chromium in regions with the strong presence of ultrabasic rocks. Dominant part of the groundwater samples surpasses in many cases the European Community (EC) drinking water permissible limits. Thus, they are unsuitable for human consumption. PCA illustrated four factors, which clarified 80.62% of the aggregate variance of data and HCA classified two statistically significant clusters of sampling sites. Results show natural procedures ascribed to the weathering of the minerals contained in the ultrabasic rocks and anthropogenic influences related to the use of fertilizers and wastewater leak. In light of FAO standards and Richards’s classification, the groundwaters are reasonable for irrigation purposes, featuring waters with low sodium hazard and moderate salinity hazard.

ACS Style

Nikos Charizopoulos; Eleni Zagana; Aris Psilovikos. Assessment of natural and anthropogenic impacts in groundwater, utilizing multivariate statistical analysis and inverse distance weighted interpolation modeling: the case of a Scopia basin (Central Greece). Environmental Earth Sciences 2018, 77, 380 .

AMA Style

Nikos Charizopoulos, Eleni Zagana, Aris Psilovikos. Assessment of natural and anthropogenic impacts in groundwater, utilizing multivariate statistical analysis and inverse distance weighted interpolation modeling: the case of a Scopia basin (Central Greece). Environmental Earth Sciences. 2018; 77 (10):380.

Chicago/Turabian Style

Nikos Charizopoulos; Eleni Zagana; Aris Psilovikos. 2018. "Assessment of natural and anthropogenic impacts in groundwater, utilizing multivariate statistical analysis and inverse distance weighted interpolation modeling: the case of a Scopia basin (Central Greece)." Environmental Earth Sciences 77, no. 10: 380.

Proceedings
Published: 01 January 2018 in Proceedings
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The scope of this paper is to evaluate the short-term predictive capacity of the stochastic models ARIMA, Transfer Function (TF) and Artificial Neural Networks for water parameters, specifically for 1, 2 and 3 steps forward (m = 1, 2 and 3). The comparison of statistical parameters indicated that ARIMA models could be proposed as short-term prediction models. In some cases that TF models resulted in better predictions, the difference with ARIMA was minimal and since the latter are simpler in their construction, they are proposed for short-term prediction. Artificial Neural Networks didn’t show a good short-term predictive capacity in comparison with the aforementioned models.

ACS Style

Antonis Sentas; Lina Karamoutsou; Nikos Charizopoulos; Thomas Psilovikos; Aris Psilovikos; Athanasios Loukas. The Use of Stochastic Models for Short-Term Prediction of Water Parameters of the Thesaurus Dam, River Nestos, Greece. Proceedings 2018, 2, 634 .

AMA Style

Antonis Sentas, Lina Karamoutsou, Nikos Charizopoulos, Thomas Psilovikos, Aris Psilovikos, Athanasios Loukas. The Use of Stochastic Models for Short-Term Prediction of Water Parameters of the Thesaurus Dam, River Nestos, Greece. Proceedings. 2018; 2 (11):634.

Chicago/Turabian Style

Antonis Sentas; Lina Karamoutsou; Nikos Charizopoulos; Thomas Psilovikos; Aris Psilovikos; Athanasios Loukas. 2018. "The Use of Stochastic Models for Short-Term Prediction of Water Parameters of the Thesaurus Dam, River Nestos, Greece." Proceedings 2, no. 11: 634.

Original article
Published: 12 September 2017 in Environmental Earth Sciences
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In the catchment area of Scopia, Central Greece, a lumped applied approach of water balance was accomplished, by applying the Zygos model, which delineates an essential water balance forms. The model is in view of Thornthwaite model, in its modified version. It can be adjusted automatically, with the evolutionary annealing-simplex technique for nonlinear optimization, or manually and the input data are precipitation and the potential evapotranspiration. In the present study, both programmed and manual calibration occurred. Programmed calibration took place, utilizing a specimen of measured runoff values from October 2009 to March 2011. Despite the fact that the Nash–Sutcliffe coefficient (NSC) value was high (0.87), the simulated parameters of water balance had abnormal significance for Scopia catchment area. On the contrary, manual calibration uncovered that the actual evapotranspiration constitutes 64.6% (450.1 mm) of the precipitation. Runoff and percolation represent 20.6% (143.6 mm) and 14.8% (102.9 mm) of the precipitation, respectively. The NSC (0.70) and the validation criteria exhibit an ideal adjustment of simulated to measured runoff, while the hydrological parameters appeared to have a physical significance for the study site. Zygos model connects the emergence of springs with the development of the karstification in the carbonate rocks of the region and affirms the predominance of runoff versus percolation due to the hydrolithological structure of the Scopia catchment. This is related to the presence of episodic floods in the area. The yearly precipitation values were found with an error of 0.2% and are viewed as insignificant.

ACS Style

Nikos Charizopoulos; Aris Psilovikos; Eleni Zagana. A lumped conceptual approach for modeling hydrological processes: the case of Scopia catchment area, Central Greece. Environmental Earth Sciences 2017, 76, 1 .

AMA Style

Nikos Charizopoulos, Aris Psilovikos, Eleni Zagana. A lumped conceptual approach for modeling hydrological processes: the case of Scopia catchment area, Central Greece. Environmental Earth Sciences. 2017; 76 (18):1.

Chicago/Turabian Style

Nikos Charizopoulos; Aris Psilovikos; Eleni Zagana. 2017. "A lumped conceptual approach for modeling hydrological processes: the case of Scopia catchment area, Central Greece." Environmental Earth Sciences 76, no. 18: 1.

Erratum
Published: 16 September 2016 in Environmental Monitoring and Assessment
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ACS Style

Nikos Charizopoulos; Eleni Zagana; Georgios Stamatis. Erratum to: Hydrogeochemical investigations in a drained lake area: the case of Xynias basin (Central Greece). Environmental Monitoring and Assessment 2016, 188, 567 .

AMA Style

Nikos Charizopoulos, Eleni Zagana, Georgios Stamatis. Erratum to: Hydrogeochemical investigations in a drained lake area: the case of Xynias basin (Central Greece). Environmental Monitoring and Assessment. 2016; 188 (10):567.

Chicago/Turabian Style

Nikos Charizopoulos; Eleni Zagana; Georgios Stamatis. 2016. "Erratum to: Hydrogeochemical investigations in a drained lake area: the case of Xynias basin (Central Greece)." Environmental Monitoring and Assessment 188, no. 10: 567.

Journal article
Published: 24 July 2016 in Environmental Monitoring and Assessment
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In Xynias drained Lake Basin’s area, central Greece, a hydrogeochemical research took place including groundwater sampling from 30 sampling sites, chemical analysis, and statistical analysis. Groundwaters present Ca–Mg–HCO3 as the dominant hydrochemical type, while their majority is mixed waters with non-dominant ion. They are classified as moderately hard to hard and are characterized by oxidizing conditions. They are undersaturated with respect to gypsum, anhydrite, fluorite, siderite, and magnesite and oversaturated in respect to calcite, aragonite, and dolomite. Nitrate concentration ranges from 4.4 to 107.4 mg/L, meanwhile 13.3 % of the samples exceed the European Community (E.C.) drinking water permissible limit. The trace elements Fe, Ni, Cr, and Cd present values of 30, 80, 57, and 50 %, respectively, above the maximum permissible limit set by E.C. Accordingly, the majority of the groundwaters are considered unsuitable for drinking water needs. Sodium adsorption ratio values (0.04–3.98) and the electrical conductivity (227–1200 μS/cm) classify groundwaters as suitable for irrigation uses, presenting low risk and medium soil alkalization risk. Factor analysis shows that geogenic processes associated with the former lacustrine environment and anthropogenic influences with the use of fertilizers are the major factors that characterized the chemical composition of the groundwaters.

ACS Style

Nikos Charizopoulos; Eleni Zagana; Georgios Stamatis. Hydrogeochemical investigations in a drained lake area: the case of Xynias basin (Central Greece). Environmental Monitoring and Assessment 2016, 188, 1 -21.

AMA Style

Nikos Charizopoulos, Eleni Zagana, Georgios Stamatis. Hydrogeochemical investigations in a drained lake area: the case of Xynias basin (Central Greece). Environmental Monitoring and Assessment. 2016; 188 (8):1-21.

Chicago/Turabian Style

Nikos Charizopoulos; Eleni Zagana; Georgios Stamatis. 2016. "Hydrogeochemical investigations in a drained lake area: the case of Xynias basin (Central Greece)." Environmental Monitoring and Assessment 188, no. 8: 1-21.

Journal article
Published: 25 April 2016 in Environmental Earth Sciences
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In the catchment of Xynias drained Lake, hydrologic processes simulation took place using a lumped approach with the conceptual model Zygos. The model implements a conceptual soil moisture accounting scheme extended with a groundwater tank and the input data were the monthly time series of rainfall and the potential evapotranspiration. The automatic optimization procedure of the model was implemented using the evolutionary annealing-simplex algorithm for maximum 11,000 iterations, inserting an 18-month observed runoff time series. It showed that hydrologic balance factors had non-physical significance for the study area. The model’s manual calibration for a Nash coefficient of 0.85 revealed that actual evapotranspiration constitutes 62.5 % (389.7 mm), runoff 22.7 % (141.8 mm) and infiltration 14.8 % (92.2 mm) of precipitation, showing optimal adaptation of simulated to observed runoff. The model estimated the initial reserve of soil moisture related to the presence of organic matter which increases water retention, a residue of the former lake. It confirmed zero runoff values during the summer months and connected the occurrence of springs and the outflows to other catchments (59.8 mm) with the karstification degree of the study area. The error on the annual rainfall is 4.9 % and is considered acceptable.

ACS Style

Nikos Charizopoulos; Aris Psilovikos. Hydrologic processes simulation using the conceptual model Zygos: the example of Xynias drained Lake catchment (central Greece). Environmental Earth Sciences 2016, 75, 1 .

AMA Style

Nikos Charizopoulos, Aris Psilovikos. Hydrologic processes simulation using the conceptual model Zygos: the example of Xynias drained Lake catchment (central Greece). Environmental Earth Sciences. 2016; 75 (9):1.

Chicago/Turabian Style

Nikos Charizopoulos; Aris Psilovikos. 2016. "Hydrologic processes simulation using the conceptual model Zygos: the example of Xynias drained Lake catchment (central Greece)." Environmental Earth Sciences 75, no. 9: 1.