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|Title:||Contribution à l’économie de l’eau par la réduction de l’évaporation des plans d’eau par les films mono-moléculaires|
|Keywords:||open water storages|
|Abstract:||Clean fresh water is the most precious natural resource available to mankind. People must have water for personal, municipal, industrial and agricultural use. Most of surface water in Algeria is stored in big and small dams and this and this type of storage allows for the greatest loss of water by evaporation. In Algeria 100 billion m3 of waterfalls as precipitations each year. Of this amount 85% of water is returned to the atmosphere by evaporation. Water conservation is a necessity in arid states that have scant rainfall and high evaporation losses. Scientists and engineers have considered many physical and chemical methods in attempt to reduce evaporation losses from open water storages. One of the most promising techniques is the application of a thin chemical film on the surface of the water to retardate evaporation. The present thesis allows presenting the first Algerian experiments of water storages evaporation reduction by the technique of monolayer. To facilitate measurement of the evaporation rate and the microclimate measurements were made on a small scale water surface (Colorado-type evaporation pan). This choice was also justified because there is a large body of knowledge on the physical behavior of open pan evaporation. This gives a valuable basis for the interpretation of the results and their application to dams. Small scale field trials were conducted in Hassi Ben Abdellah and Nezla locations (department of Ouargla) and laboratory studies were conducted at the University of Ouargla. Experiments have had as objectives to study the efficiency of this technique under Algerian arid climate and its effects on water quality and aquatic beings. Results have shown that a continuous application of monolayers on water surfaces allows to save water ( by registering evaporation reduction rates of 20% and more), do not affect a lot physical and chemical water parameters and have no toxic effects on aquatic beings.|
|Description:||UNIVERSITE KASDI MERBAH OUARGLA Faculté des Sciences Appliquées Département de Génie civil et Hydraulique|
|Appears in Collections:||Département de Hydraulique et Génie Civil - Doctorat|
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