9892

9122

كارشناسي ارشد

آبياري و زهكشي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1393

پانزده، 85ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

بهروز مصطفي زاده فرد

جهانگير عابدي كوپايي، محمدرضا مصدقي

94/2/7

مهدي قيصري، محمد شايان نژاد

1396/09/26

كتابنامه

كشاورزي

مهندسي كشاورزي

ID9122

86 The Simulation of Dry Drainage Using a Three dimensional Laboratory Model Ehsan Ghasemi ehsan ghasemi@ag iut ac ir January 5 2015 Department of Water Engineering College of Agriculture Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Behrouz Mostafazadeh Fard behrouz@cc iut ac irAbstractThe increase of world population requires food security and sustainable agriculture and theseachievements can be reached through drainage of agricultural lands The conventional drainage methodssuch as lateral drainage vertical drainage and interceptor drains have been used for many years to controlwater table and soil salinity These methods increase agricultural production but their installations areexpensive and cause damage to environment Therefore in recent years less expensive and moreenvironmentally acceptable drainage methods have been introduced Dry drainage is a new drainagemethod that has been introduced recently In this method the natural soil system is used to reclamate soiland evaporation of fallow land is used to control soil salinity and water table of planted area In drydrainage part of field will be cultivated and another part will be left as fallow For dry drainage it isrequired that the water table be shallow and evaporation be high similar to the condition of many dry andsemi dry regions There are few researches about the design and performance of this method of drainageunder different soil salinity conditions Therefore the objective of this study was to evaluate theperformance of dry drainage under different soil and irrigation water salinities In order to simulate theconditions of dry drainage a physical based model with dimension of 200 cm length 50 cm wide and 100cm high was designed constructed and the model was used to collect data The model was designed insuch a way that half of it could be used for irrigation and the other half could remain as fallow The modelwas studied for six different combinations of soil salinity irrigation water salinity and water tableposition During each experiment and for each of the above conditions soil moisture soil salinity andtemperature profiles were monitored with respect to time and were compared For each of the aboveconditions and during the experiment the evaporation was measured The lowest evaporation with valueof 5 mm per day was observed at time that surface of fallow soil was covered with salt This value isclose to the common design value of drainage coefficient of agricultural lands The results showed that asthe irrigation water salinity increases the performance of dry drainage improve As the salinity ofirrigation water and soil increased the daily evaporation decreased For each of the experimentalconditions the salinity evaporation profile was plotted This plot can be used for better evaluation anddesign of dry drainage for the study site For dry and semi dry regions which are suitable for dry drainagecondition the use of dry drainage method is recommended to control and reduce soil salinity Keywords Dry drainage Salinity control Shallow water table Evaporation Fallowland Lysimeter

بهروز مصطفي زاده فرد

جهانگير عابدي كوپايي، محمدرضا مصدقي

مهدي قيصري، محمد شايان نژاد