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Traditional Methods Assessment of Air Relative Humidity in aride zone in MOROCCO

Congress: 2008
Author(s):
Tiba Zine El Abidine(thesis student), Ayyoub Abdellatif(thesis student) and Lakhal El Khadir(professor) UFR : EAU – PROCEDES – ENVIRONNEMENT, Laboratoire d'Automatique, de l’Environnement et Procédés de Transfert (LAEPT). Faculty of Sciences Semlal

Keyword(s): Traditional Methods, Assessment , Air Relative Humidity
AbstractAbstract: In Moroccan regions, pumped ground water and the water from streams, rivers and reservoirs is no longer sufficient to cover the ever-increasing water demand. In recent decades, the research has according a new interest in water resources like rain- and flood water harvesting by dew. Traditional water harvesting techniques have been practiced in many dry areas since long time, (coastal and mountainous areas). In this work, the first main objective is to present the assessment of the traditional methods for harvesting humidity in Morocco. Many areas have been prospected and we have selected tree zones in mountainous and coastal regions. We have also presented some techniques used by farmers in order to enhance the harvesting of air relative humidity. The tillage practiced by farmers can change continuously the porosity and the captivity of soils, so, the harvesting humidity increases. The presence of stones on the upper soil surface can reduce the evaporation in diurnal phase and enhance the condensation in the nocturne phase. The mulch technique reduces evaporation but its effect on air relative humidity harvest is limited. The second objective aims to describe the contribution of water captured by humidity in the total water balance. Correlation laws have been presented in order to simplify the use of this phenomenon in mathematical models. In order to quantify the effect of the harvest of air relative humidity on soil temperature, soil water storage and evaporation, some experimental works were conducted on hilly areas with various hypsographic and microclimatic conditions greatly affecting daily fluctuations of air humidity and soil characteristics. The experimental results were used in order to evaluate the quantity of soil water adsorbed by harvesting of relative air humidity. In this study, we have collect metrological data by using a Campbell Scientific Equipments Station recorder on data loggers every half hour. Where, the soil water content at different depths is calculated by using Time Domain Reflectometers (TDR). The main result of this study shows that soil water adsorbed induce an increasing in the total evaporation and in soil water storage especially on the upper layers. The effect of soil water adsorbed on soil temperature appears for the first surface of soil and become absent in the profound zone because the vapour condensation phenomenon is very important at night for the first layers.
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