نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد، گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه بین‌المللی امام خمینی (ره) ، قزوین، ایران
2 استادیار گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران
3 دانشیار گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Fresh groundwater overexploitation causes many problems the most important of which are saline water expansion to upstream lands and enhancing salt concentration in shallow groundwater conditions. Interceptor drains can control salinity expansion and decrease saline water hydraulic gradient to freshwater resources. Also, in arid and semi-arid regions evaporation plays an important role in decreasing hydraulic head. In this research, HYDRUS-2D has been used in order to assess the effect of evaporation on groundwater depth and drainage coefficient in Abyek interception drain. This salt marsh has located in the southeast of Qazvin and the purpose of installing an interceptor drain in this area is to lower the saline groundwater level and control the salinity expansion till upstream lands gradually improve by soil leaching due to rainfall and groundwater flow and drainage outflow. Simulation has been done in 90 days for three soil texture: clay, loam and sand and four evaporation rate including: low, medium, high (0.2, 1, 2.5 ) and without evaporation. Results showed that clay evaporation has a significant role in causing a decrease in water table level and drainage coefficient. As the evaporation rate increased from 0 to 0.2 groundwater level drop increased by 16.5% and the drainage coefficient decreased by 20.6%. in loamy soil, these values were 1.9% and 1.7%, respectively. As a result, the effect of evaporation is less in loamy soil and a low evaporation rate can be ignored. Also, low and medium evaporation rates in sandy soils are ineffective in causing groundwater level decrease and reducing drainage coefficient. While high evaporation rate with a 6.9% increase in water level fall and a 15.7% decrease in drainage coefficient is effective and should be measured accurately and considered in the simulation. The results of this study are consistent with the work of researchers who have worked in related fields and it is suggested that special attention should be paid to the effect of evaporation in drainage studies especially in clay soils.
کلیدواژه‌ها [English]
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