Alain Vidal

Alain Vidal
AgroParisTech · SIAFEE

About

33
Publications
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Publications

Publications (33)
Article
Background: Many foods have an antioxidant activity, and nutrition may mitigate COVID-19. Some countries with a low COVID-19 mortality have a relatively high consumption of cabbage or fermented foods. To test the potential role of fermented foods and cabbage in COVID-19 mortality in Europe, we performed an ecological study. Methods: The EFSA Compre...
Article
Full-text available
There are large between- and within-country variations in COVID-19 death rates. Some very low death rate settings such as Eastern Asia, Central Europe, the Balkans and Africa have a common feature of eating large quantities of fermented foods whose intake is associated with the activation of the Nrf2 (Nuclear factor (erythroid-derived 2)-like 2) an...
Article
Full-text available
Large differences in COVID‐19 death rates exist between countries and between regions of the same country. Some very low death rate countries such as Eastern Asia, Central Europe or the Balkans have a common feature of eating large quantities of fermented foods. Although biases exist when examining ecological studies, fermented vegetables or cabbag...
Article
Large differences in COVID‐19 death rates exist between countries and between regions of the same country. Some very low death rate countries such as Eastern Asia, Central Europe, or the Balkans have a common feature of eating large quantities of fermented foods. Although biases exist when examining ecological studies, fermented vegetables or cabba...
Preprint
Full-text available
Background Many foods have an antioxidant activity, and nutrition may mitigate COVID-19. To test the potential role of vegetables in COVID-19 mortality in Europe, we performed an ecological study. Methods The European Food Safety Authority (EFSA) Comprehensive European Food Consumption Database was used to study the country consumption of Brassica...
Preprint
Background Many foods have an antioxidant activity and nutrition may mitigate COVID-19. Some of the countries with a low COVID-19 mortality are those with a relatively high consumption of traditional fermented foods. To test the potential role of fermented foods in COVID-19 mortality in Europe, we performed an ecological study. Methods The European...
Article
Community-managed irrigation systems are commonly faced with problems of low system-level performance. A comprehensive survey was undertaken to assess and quantify the causes of the low irrigation performance in a community-managed oasis in southern Tunisia. At the irrigation system level, results showed that irrigation intervals were double those...
Article
Full-text available
Henri Tardieu nous a quittés le 2 avril 2010. Passionné par l'eau et l'environnement, il était devenu Ingénieur du génie rural, des eaux et des forêts après avoir été l'un des plus jeunes diplômés de l'École polytechnique.
Article
Dry drainage is thought to be a potential approach to control soil salinity. This study took the Hetao Irrigation District as an example and evaluated the effectiveness of dry drainage by using remote sensing, a conceptual model and a field experiment. Archived remote sensing images from 1973–2006 were used to delineate the temporal and spatial cha...
Article
Irrigation programmes are usually based on technical and economic considerations without substantial involvement of the target farmers. This study aimed to investigate farmers' discourse, practices and perceptions, and to emphasize progress, limit and synergy of farmers' representation in the modernization programme undertaken by engineers in the F...
Conference Paper
Full-text available
Résumé — Les performances de l'irrigation sont analysées dans l'oasis de Fatnassa Nord. Les résultats mettent en évidence un allongement très important du tour d'eau (jusqu'à 60 jours en période de pointe estivale) sous l'influence conjuguée de l'extension des plantations et de pratiques et stratégies inadaptées des agriculteurs. La faible efficien...
Article
In the coming 25–30 years global food production will have to be doubled in order to maintain food security at the global level. With respect to this to a certain extent the advantage is that food prices have increased over the past seven to eight years, and especially during the past two years. This may put farmers who are able to sell at least a...
Article
Full-text available
Cette communication expose la méthode suivie pour mettre en place un système d'évaluation des performances d'un périmètre collectif irrigué, appliquée à une oasis au sud tunisien. Après avoir proposé une restructuration des déterminants de dysfonctionnement et des variables identifiées en relation avec le fonctionnement actuel du périmètre irrigué,...
Article
Full-text available
Les performances de l’oasis de Fatnassa sont sous la dépendance d’un ensemble de contraintes physiques et de dysfonctionnements liés aux pratiques et comportements individuels face à la gestion collective de l’aménagement. Ces contraintes et dysfonctionnements ont été abordés sous l’angle de leur perception par les agriculteurs. Le fonctionnement d...
Conference Paper
Full-text available
RESUME La salinité des sols est présente dans la plupart des grands systèmes d'irrigation à travers le monde sous l'effet conjugué d'une mauvaise qualité des eaux d'irrigation, de l'aridité et d'un drainage insuffisant du sol et des aquifères. Les tendances évolutives dans la gestion de l'eau et la salinité des sols sont évaluées à travers différen...
Article
In countries facing water scarcity, governmental water agencies try to transfer this constraint to farmers, e.g. by encouraging them to shift from traditional to localized irrigation methods to save water. However, water shortage is often much less a problem for farmers than soil limitations, their objective being mostly to maximize their income pe...
Article
Full-text available
Multidirectional remotely sensed optical and thermal images acquired within a row cotton crop in Montpellier (France) were used to test the opportunities and limitations of an existing water stress index, the Water Deficit Index (WDI, based on the trapezoid approach). The WDI was applied with multidirectional crop surface temperatures (Ts) and refl...
Article
Existing experimental methods based on the measurement of crop temperature to estimate water stress have been applied for 20 years. However, the application of such techniques is limited because they are not able to totally overcome either soil interference on the measured signal or directional effects involved in temperature measurements according...
Article
Full-text available
A pertinent interpretation of thermal infrared (TIR) information to characterize crop water status requires at least to consider the fraction of crop cover. Even if the crop cover is known, such an interpretation remains difficult and the current issues to be overcome in the field of TIR remote sensing applications stands on bare soil effects. An e...
Conference Paper
The interpretation of thermal infrared (TIR) information as a crop water status indicator implies the understanding of plant water functioning in given environmental conditions. As water exchanges between plant and the atmosphere occur at leaf level through stomata, it appears interesting to work at this level to consider ecophysiological mechanism...
Article
Full-text available
In order to face the challenges given to irrigated agriculture by the Earth Summit of Rio in 1992, the International Commission on Irrigation and Drainage (ICID) has defined major priority actions, whose first is the Watsave plan for water conservation. This programme, based on an experts team representing main irrigating countries of the world, ai...
Article
Mediterranean forests are regularly subjected to a large number of fires; 537 000 hectares were burned during the severe European drought of 1990. The French Ministries of Environment, Interior and Agriculture are trying to implement efficient methods to prevent forest fires and to reduce their incidence. Fire risk is composed of human, ecological...
Article
This article reviews the major topics discussed at the Thermal Remote Sensing Workshop held at La Londe les Maures, France in 1993 and concludes with a list of new items and concepts suggested during the meeting
Article
One of the possible applications of satellite radar remote sensing is to estimate surface soil moisture. To evaluate the capacity of ERS 1/synthetic aperture radar (SAR), a European Space Agency (ESA) pilot project has been set up. The test site is a small agricultural watershed situated in the central part of French Brittany. During 1992 and 1993,...
Article
Mediterranean forests are regularly subjected to a large number of fires; 537,000 ha were burned during the severe European drought of 1990. The French Ministries of Environment, Interior, and Agriculture are trying to implement efficient methods to prevent forest fires and to reduce their incidence. Fire risk is composed of human, ecological, and...
Article
Thermal infrared data of LANDSAT Thematic Mapper (TM) are hardly used, probably due to the difficulties met when trying to correct them for atmospheric effects. A method for correcting these data was designed, based on surface energy balance estimation of known wet and dry targets included in the TM image to be corrected. This method, only using th...
Article
Thermal infrared data from NOAA-AVHRR are used to map surface temperature with pixels of 1 km<sup>2</sup>. Physical relationships give evapotranspiration from surface temperature and readily available meteorological parameters. Maps of evapotranspiration are then made for areas where sugarcane is dominant and are used to follow the water balance an...
Article
Digital numbers in SPOT-1 HRV multispectral imagery were transformed to reflectance factor values. This approach is based on a simplified-scene radiance equation that is developed in this paper. The values of some parameters needed in the equation such as path radiance, total normal optical thickness, and diffuse spectral irradiance were estimated...
Conference Paper
Radiance data detected by satellite sensors are generally influenced by undesirable topographic effect. In order to optimize information extraction from remotely sensed data it is important to remove this effect. An approach to this necessity is proposed. The digital numbers in SPOT-1 high-resolution visible (HRV) multispectral imagery are transfor...
Article
The present paper studies the process of irrigation systems modernization in five selected cases located in the Mediterranean and West African regions. These were chosen from fourteen irrigation schemes, ranging from 400 to 40000 hectares, surveyed by the International Programme for Technology and Research in Irrigation and Drainage (IPTRID) in 200...

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