Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Effect of Open Drains on the Water and Salt Movement in the Root Zone

تأثير المصارف المكشوفة على حركة المياه والأملاح في منطقة جذور النبات

Auteur : Amgad Roshdy Abdo Silim

Université de soutenance : Cairo University

Grade : Master of Science (MS) 2008

Résumé
The Drainage is necessary to control salinity in agricultural land as well as to remove excess irrigation water. Recently, the need to assess drainage water quality has become important especially with the proliferation of environmental regulations. The main objective of this study is to investigate the effect of open drains on the groundwater movement and salinity distribution in the soil with emphasis on the root zone (upper 1m of soil). In order to simulate the irrigation-drainage process at the field level, VS2DTI (a computer model developed by USGS) has been used to solve the flow and salt equations for the subsurface system without being confined to many of the limiting assumptions of the traditional drainage design approaches. A parametric study has been implemented by changing soil type, drain spacing, drain free board and drain bed level. The main conclusions of this study are that the drain efficiency to remove salts from the root zone increases with the hydraulic conductivity of the soil, drain free board and the spacing between drains. The study also has come up with a new design equation which can be used by practicing engineers to assess the amount of salts that a drain can move from the root zone given some hydraulic and geometric parameters. Finally, recommendations for future work have been given.

Mots clés : Study Drainage Water Quality, VS2DTI (Computer Model), Salt Equations

Présentation

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