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Publications
Publications (47)
The paper presents a comprehensive, thought simple, methodology, for forecasting the annual hydrological drought, based on meteorological drought indications available early during the hydrological year. The meteorological drought of 3, 6 and 9months is estimated using the reconnaissance drought index (RDI), whereas the annual hydrological drought...
Drought events can cause severe damages to agriculture and in particular to rainfed agriculture. The problems can be more evident in semi-arid regions of the Mediterranean. It is of great importance to assess the impacts of drought on the yield at an early stage, in order to be able to take measures on time for mitigating the anticipated losses, su...
Drought is a complex phenomenon which can be characterised mainly by its severity, duration and areal extent. Among these three dimensions, drought severity is the key factor which can be used for drought analysis. Drought indices are typically used to assess drought severity in a meaningful way. DrinC (Drought Indices Calculator) is a software pac...
Drought indices are commonly used tools for drought characterisation and analysis. The Reconnaissance Drought Index (RDI) is one of the widely used indices, due to its high sensitivity and resilience. The basic form of the index is the ratio of the cumulative precipitation to potential evapotranspiration, for a specified reference period. The RDI i...
Drought is a major natural hazard with significant effects in the agricultural sector, especially in arid and semi-arid regions. The accurate and timely characterisation of agricultural drought is crucial for devising contingency plans, including the necessary mitigation measures. Many drought indices have been developed during the last decades for...
The adverse and severe impacts of climate-induced natural hazards, which are expected to be aggravated by climate change, are forming a wider outline of the environmental crisis, being a source of negative emotions for human societies. Children and young people, in particular, are one of the most vulnerable social groups to this distress. In this r...
Potential evapotranspiration (PET) is a particularly important parameter for understanding water interactions and balance in ecosystems, while it is also crucial for assessing vegetation water requirements. The accurate estimation of PET is typically data demanding, while specific climatic, geographical and local factors may further complicate this...
The Anthropocene and current ecological
crisis require us to redefine environmental
education. This paper presents pedagogical
principles and tools for using weather and
climate as a framework for early childhood
environmental education. The pedagogical
praxis focuses on young children’s everyday
experiences, offering an alternative to
abstract, in...
Light availability and its composition in components affecting plant growth as photosynthetically active radiation (PAR), are of critical importance in agricultural and environmental research. In this work, radiation data for the period 2009–2014 in a forest site in Greece were analyzed to identify the effect of meteorological variables on the form...
The agricultural sector is vulnerable to extreme phenomena such as droughts, particularly in arid and semi-arid environments and in regions where water infrastructure is limited. Devising preparedness plans, including means for efficient monitoring and timely identification of drought events, is essential for informed decision making on drought mit...
Agricultural drought is a natural hazard, often leading to significant crop yield losses and jeopardising food security. Climate change is anticipated to increase the duration and the magnitude of drought events, augmenting also their adverse effects. Recent studies, as well as policy initiatives, emphasise the need of proper farm-level management,...
Weather variations affect natural ecosystems, while in regions where climate change is anticipated to intensify extreme events such as droughts, the vitality of vulnerable species may be reduced. The sensitivity of key-species to the climatic conditions may illustrate their adjustability in specific areas and assist decision making towards proper m...
Considerable disagreement exists regarding the definition of drought. However, it is widely accepted that drought is a natural phenomenon caused mainly by a sustained below-average precipitation and high evapotranspiration over a large area. This prolonged water deficiency is propagated through the surface and groundwater systems. Since groundwater...
Droughts are hazardous phenomena affecting practically all the sectors of the economy. Generally, agriculture is the most vulnerable sector, dependent on both the characteristics of the drought episode and the sensitivity of the crops of the existing crop pattern. Sensitive crops to water deficit (rainfed or irrigated) may lose significant part of...
The drought phenomenon is directly associated to the agricultural production and it is considered as one of the major water-related hazards in this sector. Conventionally, the magnitude of drought impacts on crops, taking into account the susceptibility of the plants to the meteorological and hydrological conditions, is referred to as agricultural...
Long-term impacts of drought, such as groundwater decline, can emerge during a persisting drought. Though not easily visible, they are severe and harder to cope with. Groundwater is considered a resilient source during drought in semi-arid areas. In this paper the response of a coastal aquifer to meteorological drought severity is investigated. The...
Droughts can be considered as multidimensional hazardous phenomena characterised by three attributes: severity, duration and areal extent. Conventionally, drought events are assessed for their severity, using drought indices such as SPI (Standardised Precipitation Index), RDI (Reconnaissance Drought Index), PDSI (Palmer Drought Severity Index) and...
This paper aims at investigating the combined impacts of basin-wide multi-year
droughts and upstream human-induced activities on current and future potential development of a semi-arid transboundary basin. The approach is based on the drought analysis through three widely used drought indices (Standardised Drought Index- SPI, Reconnaissance Drought...
The calibration of a hydrological model is an important task for obtaining accurate runoff simulation results for a specific watershed. Several optimisation algorithms have been applied during the last years for the automatic calibration of conceptual rainfall-runoff (CRR) models. The aim of this study is to compare the effectiveness and the effici...
Efficient water allocation for sustainable irrigated agriculture has become a growing concern, especially in transboundary river basins where the competition between upstream and downstream countries is substantially increasing. In this paper, the Diyala basin, one of the most water-stressed basins shared between Iraq and Iran, was used as an examp...
9th Congress of EWRA”Water Resources Management in a Changing World: Challenges and Opportunities” 10-13 June 2015, Istanbul, Turkey. [O_5_19]
Meteorological drought can be considered as a multidimensional hazard characterised by severity, duration and areal extent. Several attempts have been made in the past for replacing the three dimensions by one. Conventionally, meteorological drought events are assessed for their severity, using drought indices such as SPI, RDI, PDSI and many others...
Conceptual hydrological models have been widely used as efficient tools for simulating the hydrological processes at river basin scale. Medbasin-D is a daily conceptual hydrological model included in the Medbasin software package. The model is oriented towards applications under the conditions of the Mediterranean. For a reliable prediction of stre...
Conceptual hydrological models have been widely used as efficient tools for simulating the hydrological processes at river basin scale. Medbasin-D is a daily conceptual hydrological model included in the Medbasin software package. The model is oriented towards applications under the conditions of the Mediterranean. For a reliable prediction of stre...
Meteorological drought can be considered as a multidimensional hazard characterised by severity, duration and areal extent. Several attempts have been made in the past for replacing the three dimensions by one. Conventionally, meteorological drought events are assessed for their severity, using drought indices such as SPI, RDI, PDSI and many others...
Drought is a recurring natural phenomenon caused mainly by a prolonged below-average precipitation and high evapotranspiration over a large area. This sustained water deficiency is propagated through the surface and groundwater systems affecting water availability for the various uses. The relationship between meteorological drought severity and th...
During the last decades, numerous rainfall-runoff models have been developed, incorporating various levels of complexity. However, the choice of the proper model remains a challenging task, especially in arid or semi-arid climates such as the Mediterranean, and in cases of limited data availability. In such cases, the use of simple rainfall-runoff...
There is growing concern in Iraq about the inefficiency of reactive drought management practices. Corresponding actions are largely characterized as emergency-based responses that treat the symptoms of drought rather than consider the vulnerability components associated with impacts. The Diyala watershed shared between Iraq and Iran has been used a...
This study quantifies the sensitivity of surface runoff to drought and climate change in the Diyala watershed shared between Iraq and Iran. This was achieved through a combined use of a wide range of changes in the amount of precipitation (a decline between 0% and −40%) and in the potential evapotranspiration rate (an increase between 0% and +30%)....
Drought is a natural hazard characterised mainly by three dimensions: severity, duration and areal extent. Although several simplifications were proposed for the analysis of droughts for assisting water managers and policy makers to address this complex phenomenon, drought severity remains the key factor for the characterisation of drought. Drought...
Climatic changes in a geographical area may be detected by examining long timeseries of precipitation and potential evapotranspiration. From the point of view of water resources management, both of these variables influence directly the water availability and water demand, and therefore represent the climatic conditions of the studied area effectiv...
Drought severity is conventionally assessed by drought indices. Several drought indices with varying complexity have been used in many geographical areas. Recently, a powerful drought index, the Reconnaissance Drought Index (RDI), is gaining wide acceptance mainly in the arid and semiarid climatic regions. Since RDI is based both on precipitation a...
Preventive Maintenance for Water Utility Networks (PM4WAT) is a European Project which develops an innovative web-based platform and courseware for Vocational Education and Training (VET) on state of the art practice on preventive maintenance of urban water utility networks. The project aims at improved maintenance, increased reliability and decrea...
In this paper a simplified methodology for the estimation of drought impacts on crop yield in rainfed agriculture is proposed. The methodology is based on empirical models for the estimation of actual to potential evapotranspiration ratio (ET/PET). This ratio is related to the Reconnaissance Drought Index (RDI), an expression of cumulative precipit...
The objective of this chapter is the analysis of the three major components of drought assessment and management in Greece.
First, the legal framework and the structure of services related to the water management are presented. Second, drought characterisation
is applied for two river basins, Nestos and Mornos, and thresholds for drought management...
Drought is a natural recurrent phenomenon affecting most sectors of society and the environment. Therefore it is of great importance to devise tools for the identification of drought episodes and the assessment of their severity. In this paper the Reconnaissance Drought Index (RDI) is presented with some additional comments in the way of calculatio...
Several meteorological drought indices have been used in the past to assess drought severity. Most of the indices use monthly precipitation data (e.g. SPI) and in some cases additionally monthly potential evapotranspiration data (e.g. RDI). The objective of this paper is to present the new Reconnaissance Drought Index and its requirements and also...
SUMMARY - Drought indices have been devised for identification of drought and characterization of its severity. Using drought indices, the duration, intensity and areal extent for each drought episode can be defined. They can be used to describe all types of droughts (that is meteorological drought, hydrological drought, agricultural droughts and s...
Two basic characteristics of meteorological drought were analysed in this study. Namely the severity and the areal extent
of drought. Severity was represented by two general drought indices the Standardised Precipitation Index and the Reconnaissance
Drought Index. A spatial distribution model, based on the reciprocal of the square distance, was emp...
The objective of this paper is to present a methodology for the quantification of drought risk in agriculture in Mediterranean
regions. The methodology consists of three interrelated components: the estimation of the severity and frequency of droughts,
the simulation of water use and crop yield production and the assessment of annualized risk in ag...
The interconnection of adjacent watersheds in case of complicated karstic systems is a significant issue in water resources development planning. In an interesting case study, two watersheds in the island of Crete are studied for investigating their interconnection and assess quantitatively the volumes of water passing from the one watershed to the...
A deterministic conceptual rainfall-runoff simulation model is proposed for the Mediterranean basins. The model is based on the equations describing the processes of the hydrological cycle used by MERO, a model proposed by FAO. The new software package called Medbasin is using an accounting technique in which the inputs are the daily values of prec...
Most of the islands and coastal zones of the Mediterranean suffer from droughts and water shortages which cause heavy impacts on economies, societies and the environment at local or regional scales. PRODIM project (Interreg IIIB – Archimed) aimed at producing rational, comprehensive, easy to use and applicable methods for assessing drought severity...
