عنوان مقاله [English]
Background and Objectives: The implementation of different irrigation methods in different areas is influenced by factors such as climatic conditions, water quality, topography, soil characteristics, product type and socio-economic factors, some limitations in each of the above factors In the studied area, changes in the proposed irrigation system. issues and topics related to the choice of proposed irrigation method, can be investigated by quantitative and qualitative indicators, the possibility of using these two simultaneously in the method of hierarchical analysis process, it has turned it into a powerful tool for analyzing issues in this section. Considering the above and the power of the hierarchical analysis process to decide on the appropriate method for irrigation for the region and its strength in combination with GIS, and less use of these two with each other in studies in recent years, in different parts of the country, As well as the northern Khorasan province and the city of Esfarayn, It was studied.
Materials and Methods: This research was carried out in Esfarayne County, North of Khorasan province, and between 57 degrees and 30 minutes east longitude and 37 degrees and 4 minutes north latitude and total area of 5192 square kilometers. In this study, a method was developed and presented for grading the factors influencing the selection of new irrigation systems. The effects of different factors using the correct digits (+3) to (3) investments are rated at seven points. In order to influence more important factors or preventing the same effect of factors with a different degree of importance, The coefficient is considered as the weight of each factor. This index is based on project conditions are determined using analytic hierarchy process. By combining analytic hierarchy process and geographical information system (GIS), multiplied by the weight of the layers entered. The final score, obtained of algebraic summation scores of each factor for each region. This rating is in fact the potential use of each new irrigation systems. Data related to this study, has been prepared the irrigation database under management of Jihad Agriculture in Esfarayen city.
Results: In this research locating new methods of irrigation for 77,075 hectares of irrigated lands (agriculture and gardens) Esfarāyen city of North Khorasan province is performed and results are shown as maps with scores of each region of plan area for each new irrigation systems. The results of this research show that: Out of 77,075 hectares of land in the study area is intended, in accordance 58835 hectares (76/5%) were recognized fit to Low Pressure Irrigation, 17105 hectares (22%) suitable for Local Irrigation Systems and 1135 hectares (1/5%) suitable for Sprinkler Irrigation Systems.
Conclusion: Low pressure irrigation system in the majority of regions except the northern areas because of unsuitable topography, has achieved the highest score. Therefore, Low Pressure Irrigation for raising irrigation efficiency suggested to the majority of area And in other areas (North), Localized irrigation system has been selected as the best new irrigation systems.