Aristotelis Efstathios Koskinas

Rps Group Plc

Hydroclimatic processes such as precipitation, temperature, wind speed and dew point are usually considered to be independent of each other. In this study, the cross−correlations between key hydrological−cycle processes are examined, initially by conducting statistical tests, then adding the impact of long−range dependence, which is shown to govern...

The concept of environmental flow assessment is a crucial element of modified ecosystems featuring large infrastructure such as dams and reservoirs, but the relatively short length of available inputs raises questions about the reliability of any given environmental flow scheme. However, with the use of stochastics, it is possible to quantify these...

Dams design and their operation cause strong environmental alteration and therefore a long-term debate is ongoing for the scale of these projects. At the same time, the concept of Environmental Flow Assessment (EFA) is a crucial element of modified ecosystems featuring large infrastructure such as dams and reservoirs for mitigating potential enviro...

Dams design and their operation cause strong environmental alteration and therefore a long-term debate is ongoing for the scale of these projects. At the same time, the concept of Environmental Flow Assessment (EFA) is a crucial element of modified ecosystems featuring large infrastructure such as dams and reservoirs for mitigating potential enviro...

Large-scale infrastructure projects such as dams provide a source of water and clean 7 energy to downstream communities. This is achieved by modifying a river's natural flow, which 8 changes the dynamic of the local ecosystem. To minimize any negative facets, the concept of 9 environmental flow was introduced. Modern studies have taken this origina...

In February 2017, a failure occurring in Oroville Dam’s main spillway risked causing severe damages downstream. A unique aspect of this incident was the fact that it happened during a flood scenario well within its design and operational procedures, prompting research into its causes and determining methods to prevent similar events from reoccurrin...

The subject of this thesis is the 2017 Oroville Dam spillway incident. This event is yet another example of the severe problems the United States has with maintaining its large infrastructure. However, in order to better understand how events unfolded, it is first necessary to conduct a detailed analysis of Oroville Dam and the basic elements of it...

Non-connected islands to the electric gird are often depending on oil-fueled power plants with high unit cost. A hybrid energy system with renewable resources such as wind and solar plants could reduce this cost and also offer more environmental friendly solutions. However, atmospheric processes are characterized by high uncertainty that does not p...

We simulate the electrical energy demand in the remote island of Astypalaia. To this end we first obtain information regarding the local socioeconomic conditions and energy demand. Secondly, the available hourly demand data are analysed at various time scales (hourly, weekly, daily, seasonal). The cross-correlations between the electrical energy de...