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International Institute for Geo-Information Science and Earth Observation (ITC) 2003

The integration of satellite images, GIS and CROPWAT model to investigation of water balance in irrigated area : a case study of Salmas and Tassoj plain, Iran

Yarahmadi, J.

Titre : The integration of satellite images, GIS and CROPWAT model to investigation of water balance in irrigated area : a case study of Salmas and Tassoj plain, Iran

Auteur : Yarahmadi, J.

Etablissement de soutenance : University of Twente International Institute for Geo-Information Science and Earth Observation (ITC)

Grade : Master of Science in Geo-Information Science and Earth Observation 2003

Résumé
In this research water balance was calculated for Salmas and Tassoj in the north and western-north part of Orumiyeh Lake in ten water years (1991-2001). Satellite images (Aster image), CROPWAT model, coupled with GIS were applied to compute water balance components. Satellite images (Aster on 2nd July 2001) were used to determine type and area of cultivated crops. Nine main crops for Salmas and five main crops for Tassoj area were distinguished. Ground truth data was used as ancillary data. Lack of multi-temporal images was main problem in crop classification. CROPWAT model was applied to calculate actual evapotranspiration and net irrigation water requirement based on local climatic data and derived crop data on satellite image processing. This model calculated net irrigation water requirement for some dominant crops such as : cereal, alfalfa, apple, almond, eggplant, potato, and sunflower in the study area. Inflow and outflow amounts of surface water were determined using river discharge data in irrigated area, which, are equipped with hydrometers gauges. In ungauged area runoff was estimated by applying runoff coefficient method. Groundwater uses for agricultural practices was determined using current pumping data in the Tassoj region. Groundwater uses in the Salmas area where has no pumping data was calculated by applying net irrigation water requirement approach. GIS environment was used to determine groundwater table fluctuations. Water balance for irrigated lands in both areas was calculated by applying an On-farm water balance model. The calculated water balance shows a deciding trend in both areas, particularly in the Tassoj area.

Version intégrale (ITC)

Page publiée le 30 janvier 2018