Stefanos Kozanis

Stefanos Kozanis
National Technical University of Athens | NTUA · Department of Water Resources and Environmental Engineering

Doctor of Engineering

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19
Publications
13,222
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168
Citations

Publications

Publications (19)
Article
Full-text available
The advent of ICT services on water sector offers new perspective towards sustainable water management. This paper presents an innovative web-based platform, targeting primarily the household end-users. The platform enables consumers to monitor and control, on real-time basis, the water and energy consumption of their household providing valuable i...
Article
Full-text available
A time series generator is presented, employing a robust three-level multivariate scheme for stochastic simulation of correlated processes. It preserves the essential statistical characteristics of historical data at three time scales (annual, monthly, daily), using a disaggregation approach. It also reproduces key properties of hydrometeorological...
Conference Paper
Full-text available
Smart water metering technologies for residential buildings offer, in principle, great opportunities for sustainable urban water management. However, much of this potential is as yet unrealized. Despite several ICT solutions having already been deployed aiming at optimum operations on the water utilities side (e.g. real time control for water netwo...
Article
Full-text available
We derive a new algorithm for calculating an exact confidence interval for a parameter of location or scale family, based on a two-sided hypothesis test on the parameter of interest, using some pivotal quantities. We use this algorithm to calculate approximate confidence intervals for the parameter or a function of the parameter of one-parameter co...
Chapter
Full-text available
Individuals or organizations managing meteorological or hydrological stations typically need to either collect the data on personal computers or bear the costs required to setup a server. As an alternative, the openmeteo.org database provides users and organizations the option to upload their time series, on condition that their data will be availa...
Conference Paper
Full-text available
The water supply of Athens, Greece, is implemented through a complex water resource system, extending over an area of around 4 000 km2 and including surface water and groundwater resources. It incorporates four reservoirs, 350 km of main aqueducts, 15 pumping stations, more than 100 boreholes and 5 small hydropower plants. The system is run by the...
Poster
Full-text available
We derive an algorithm which calculates an exact confidence interval for a distributional parameter of location or scale family, based on a two-sided hypothesis test on the parameter of interest, using some pivotal quantities. We use this algorithm to calculate approximate confidence intervals for the parameter or a function of the parameter of one...
Conference Paper
Full-text available
Castalia is a software package (Koutsoyiannis, D., and A. Efstratiadis, A stochastic hydrology framework for the management of multiple reservoir systems, Geophysical Research Abstracts, Vol. 3, European Geophysical Society, 2001) that uses an original two-level multivariate scheme (from annual to monthly time scale) appropriate for preserving the...
Conference Paper
Full-text available
Hydrognomon is a software tool for the processing of hydrological data. It is an open source application running on standard Microsoft Windows platforms, and it is part of the openmeteo.org framework. Data are imported through standard text files, spreadsheets or by typing. Standard hydrological data processing techniques include time step aggregat...
Technical Report
Full-text available
Final Report of the Research Project: Support on the compilation of the national programme for water resources management and preservation, Department of Water Resources and Environmental Engineering – National Technical University of Athens, Athens, February 2008. See maps and Appendices in http://www.itia.ntua.gr/782/
Poster
Full-text available
The ODYSSEUS project (from the Greek acronym of its full title ”Integrated Management of Hydrosystems in Conjunction with an Advanced Information System”) aims at providing support to decision-makers towards integrated water resource management. The end-product comprises a system of co-operating software applications, suitable to handle a wide spec...
Technical Report
Full-text available
This report describes a system for the stochastic simulation and forecast of hydrologic variables. More specifically, an original two-level multivariate scheme was introduced, appropriate for preserving the most important statistics of the historical time series and reproducing characteristic peculiarities of hydrologic processes such as persistenc...
Poster
Full-text available
Hydrognomon is a software tool for the management and analysis of hydrological data. It is built on a standard Windows platform based on client-server architecture; a database server is holding hydrological data whereas several workstations are executing Hydrognomon, sharing common data. Data retrieval, processing and visualisation are supported by...
Technical Report
Full-text available
Determination of confidence limits of distributional parameters (either marginal or dependence) and derivative quantities (e.g. distribution quantiles) is crucial for estimation of uncertainty and risk. Analytical determination is possible in few cases only. Monte Carlo simulation is a numerical method with the potential to determine confidence lim...

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