نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی آبیاری و آبادانی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2 دانشیار، دانشگاه تهران، پردیس کشاورزی و منابع طبیعی، دانشکده مهندسی آب و خاک، گروه مهندسی آبیاری و آبادانی، تخصص: آبیاری و زهکشی/ آبیاری قطره ای.مدیرت شبکه آبیاری و زهکشی
3 استاد، دانشگاه تهران، پردیس کشاورزی و منابع طبیعی، دانشکده مهندسی و فناوری کشاورزی,گروه مهندسی آبیاری و آبادانی، تخصص: مدیریت آب و آبیاری
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Abstract
Heavy metals pollution is one of the main drawbacks of using wastewater for irrigation. Exploring the pollution of heavy metals in a big area needs frequent experimental measurements, which is mostly time and money consuming. In such a condition, using satellite images and making a relationship between images and heavy metal’s concentration can be a solution for estimating the polluted area. In this study, the image of Sentinell2 satellite was used to evaluate the heavy metals pollution of wastewater irrigated area in south of Tehran. For this aim, 30 soil-surface samples were collected in the area that is irrigated by raw wastewater. After preparing the samples, the concentration of Pb, Cu and Ni was determined using atomic absorption spectroscopy. Then the relation between the heavy metals concentration and reflectance in the bands or the ration of the bands at the corresponded sampling points was determined by applying the stepwise regression method. The developed models were applied on the satellite image for zoning the heavy metals concentrations in the study area. Finally, the accuracy of the developed models was examined by Root-Mean-Square Error (RMSE) and Pearson correlation coefficients. The results showed that the amounts of RMSE for the equations of Pb, Cu and Ni were 1.90, 2.54 and 1.59 respectively while the amounts of R were 0.81, 0.75 and 0.73 for these metals that showed a promising match between predicted and measured results of the models.
Keywords: Band, Metals concentration, Reflectance, Stepwise method, Satellite image, Zoning
کلیدواژهها [English]