جستجوی مقالات مرتبط با کلیدواژه "drainage" در نشریات گروه "مهندسی آب"

Agricultural activities are the largest sector of water consumption in the world and in Iran. Due to the scarcity of water resources, to prevent the reduction of crop production, the use of unconventional water resources, including agricultural drains in the irrigation cycle can be a significant help to eliminate Lack of water resources. The purpose of this study is to evaluate the use of the system (IFDM) to conserve water resources and prevent environmental degradation in agriculture. Aghili village of Gotvand city, due to having good water and soil, is a suitable bed for the annual production of more than thousands of tons of grain and non-grain products, but unfortunately in this plain we see the production of a huge amount of wastewater. In this study, the values of pH, temperature, DO, BOD, TDS, TSS, EC, sodium, phosphate, nitrate, in a period of five years (95-90) in river water and in the drainage of this plain are analyzed. Took. Based on the obtained results, the quality of drainage is desirable and it can be used in the irrigation cycle mixed with canal water to irrigate salinity-resistant crops such as wheat, autumn barley and summer cotton.

In this study, a two-dimensional model is presented to design the distances between laterals and to predict the situation of water table between two lateral drainages after an irrigation or precipitation. The equation is obtained through combining continuity, Darcy and Van Genuchten equations and is solved using numerical finite difference method considering appropriate boundary conditions.. To validate the obtained model, the control profile was compared to model derived profile. The results indicated that the outputs of the model have more precision in long-term periods, and that acceptable results can be produced if numerical methods are applied to solve the flow equations. Moreover, it was found that the vertical flow is predominant above drainages axes at the onset of infiltration, while horizontal flow is predominant in long-term periods. Comparing the model to traditional draining equations for designing drainage distances, it was found that the Dum equation gives the best results, while the presented model has more precise outputs than Dum equation.