Antonis Christofides's research while affiliated with National Technical University of Athens and other places
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Publications (13)
This report contains Supplementary Information, namely, mathematical
derivations, justifications and illustrations, for the paper series Revisiting causality using
stochastics (Koutsoyiannis et al., 2022a,b) and in particular its first part, Theory
(Koutsoyiannis et al., 2022a). It comprises three sections, namely Relationship of
continuous- and di...
Causality is a central concept in science, in philosophy and in life. However, reviewing various approaches to it over the entire knowledge tree, from philosophy to science and to scientific and technological applications, we locate several problems, which prevent these approaches from defining sufficient conditions for the existence of causal link...
The large-scale surface-water monitoring infrastructure for Greece Open Hydrosystem Information Network (Openhi.net) is presented in this paper. Openhi.net provides free access to water data, incorporating existing networks that manage their own databases. In its pilot phase, Openhi.net operates three telemetric networks for monitoring the quantity...
For Mediterranean countries, irrigation is by far the major water consumer. In this framework, the development of operational tools that are able to generate recommendations aiming to improved irrigation management is of great importance. Such a system is IRMA_SYS (the system hereafter) that covers the plain of Arta in Greece. Data from 6 agro-mete...
Since agricultural water use has a substantial share in Greece, irrigation scheduling forecast and management tools constitute significant assets. This study illustrates the concept and implementation of the IRMA_SYS, a regional, user-friendly computer/mobile-based service. IRMA_SYS was implemented as open, fully customizable, modular software capa...
Potential evapotranspiration (PET) is key input in water resources, agricultural and environmental modelling. For many decades, several approaches have been proposed for the consistent estimation of PET at several time scales of interest. The most recognized is the Penman-Monteith formula, which is yet difficult to apply, since it requires simultan...
According to EU Water Framework Directive 2000/60/EC, action is needed to protect waters in both qualitative and quantitative terms. In this context a challenge of water-related issues for Mediterranean countries is to integrate water demand management in agriculture and to develop added value tools to optimize efficiency in irrigation. Potential f...
Agriculture plays a key role in the management of water use. Especially in Greece, irrigation is an essential element of agricultural production and agricultural water use has a substantial share in total water use. The presented study illustrates the key features of the IRMA_SYSTEM, a regional, user-friendly computer/mobile-based, open and free mo...
We often see statements such as “90% of climate change is caused by X” and debates on whether the dominant cause of climate change is human activity, or the sun, or something else. However, in chaotic systems, it can be difficult to defend the meaning of such assertions, because if the “effect” occurs sufficiently later than the supposed “cause”, t...
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/
The problems associated with establishing a "safe" minimum level for a reservoir serving multiple and conflicting purposes (hydroelectric power generation, water supply, irrigation and recreation) are discussed. A comprehensive approach of the problem considers three different criteria. The first criterion is water quantity. Available long-term res...
Citations
... There is a growing body of scientific findings indicating that unbridled anthropogenic warming will be globally disadvantageous, if not disastrous. However, the uncertainty, which is endemic in climate (impacts) science, generates not only legitimate, and possibly constructive, expert skepticism [71][72][73], but also radical, destructive public criticism, sowing confusion and justifying inaction (cf. review by Pidgeon & Fischhoff [74]). ...
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... https://system.openhi.net/, accessed on 15 November 2022) [29]. ...
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... The average yearly precipitation on Crete (969 mm) corresponds to approximately 6109 hm 3 [55] ( Table 3). However, less than 36% of the precipitation is stored in the soil or percolates to deeper horizons. ...
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... The DSS caters generic sets of parameters for each irrigation system type, soil [27] and crop [26] and suggests their adjustment for specific conditions. Irrigation is recommended by the system when soil moisture is estimated to have reached the lower level of the readily available water (RAW), while the irrigation dose is controlled by a refill factor (RF). Documentation and analytical flowcharts of the algorithm that is followed by the DSS, is provided by Malamos et al. [28]. When RF is set to 1, the goal of each irrigation recommendation is to refill soil moisture up to the field capacity. ...
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... One of the most significant advantages of using smartphone applications is that they represent instances of portable and simple-to-use technology, allowing for real-time decision-making. Some of these tools integrate real-time weather data with crop-specific ET or water budgeting methods [19][20][21]. Some web-based applications have also been developed, such as Wateright [22], and Crop Manage [23]. ...
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... Therefore, the statistical behavior of the residuals is close to the desirable one (i.e. white noise), indicating absence of systematic errors (Kitanidis, 1997;Malamos and Koutsoyiannis, 2015). The negative NSE values are attributed to local overestimation during the warm months or underestimation during the cold months of the year, respectively, driven from the absence of relative humidity and wind speed from the parametric model formulation. ...
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