اثر تغییر کاربری اراضی بر سطح آب زیرزمینی در دشت‌های اصفهان-برخوار، نجف‌آباد و چادگان

نوع مقاله: یادداشت تحقیقاتی

نویسندگان

1 دانش آموخته کارشناسی ارشد، رشته آبخیزداری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس،تهران، ایران

2 دانشیار، گروه علوم و مهندسی آبخیزداری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، تهران، ایران

3 استادیار، گروه علوم و مهندسی آبخیزداری، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان، ایران

چکیده

در مطالعه حاضر، اثر تغییر کاربری اراضی بر سطح آب زیرزمینی دشت­های اصفهان-برخوار، نجف­آباد و چادگان در دوره زمانی 25 سال (2015-1990) بررسی شد. به‌منظور تهیه نقشه­های کاربری اراضی، ابتدا تصاویر ماهواره لندست مربوط به سال­های 1985، 1994، 2006 و 2015 دریافت و سپس الگوریتم نزدیک­ترین همسایه روش شیءگرا برای پردازش آن‌ها به‌کار برده شد. در ادامه نقشه­های پهنه­بندی سطح آب زیرزمینی در مقیاس سالانه با استفاده از روش کریجینگ تهیه شد. برای بررسی اختلاف بین داده­های پیزومتری دشت‌های مورد مطالعه و بررسی اثر نوع کاربری اراضی بر ارتفاع آب زیرزمینی از آزمون تجزیه و تحلیل واریانس به‌روش اندازه­گیری مکرر استفاده شد. نتایج نشان داد در دو دشت اصفهان-برخوار و نجف­آباد، میانگین ارتفاع آب زیرزمینی در کاربری مرتع در مقایسه با سایر کاربری­ها اختلاف معنی­داری داشته است. هم‌چنین بررسی ارتباط متقابل تغییر درصد مساحت کاربری­های اراضی و افت آب زیرزمینی نشان داد علی­رغم کاهش کلی سطح اراضی زراعی در طول دوره مورد مطالعه در دو دشت اصفهان-برخوار و نجف­آباد، سطح آب زیرزمینی در سال­های پایانی افت شدید داشته است. علاوه بر آن طبق نتایج به‌دست آمده، افت آب زیرزمینی دشت چادگان در مقایسه با دو دشت دیگر بیش­تر متأثر از افزایش سطح اراضی زراعی بوده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The impact of Land Use Change on Groundwater Level in Isfahan-Borkhar, Najafabad and Chadegan Plains

نویسندگان [English]

  • sedigheh ghafari 1
  • Hamid Reza Moradi 2
  • Reza Moddares 3
1 Graduated M.Sc. of Watershed Management Engineering, Faculty of Natural Resources and Marine Science, Tarbiat Modares University,Tehran, Iran.
2 Associated Professor, Department Watershed Management Engineering, Faculty of Natural Resources and Marine Science, Tarbiat Modares University, Tehran, Iran.
3 Assistant Professor, Department Watershed Management Engineering, Faculty of Natural Resources, Isfahan University of Technology, Isfahan, Iran
چکیده [English]

In the current study, the effect of land use change on groundwater level in Isfahan-Borkhar, Najafabad and Chadegan plains was investigated during 25-year period (1990-2015). To provide land use maps, firstly Landsat images of years; 1985, 1994, 2006 and 2015 were provided and then the nearest neighbor algorithm of object-oriented method was used for images processing. In addition, the zoning maps of groundwater level in annual scale were prepared using Kriging method. In order to investigate the differences of piezometric data among different plains and also the effect of land use types on groundwater level, the analysis of variance (ANOVA) test with repeated measure was used. The results showed that in Isfahan-Borkhar and Najafabad plains, the average groundwater level of rangelands had a significant difference with other land uses. In addition, investigating the interactive relationship of the land uses change percentages and the groundwater level decline showed a serious decrease in groundwater level of both Isfahan-Borkhar and Najafabad plains in the last years, in spite of reduction in agricultural land use during the study period. Furthermore, according to the obtained results, the groundwater level drawdown in Chadegan Plain as compared with two other plains was mainly affected by increasing agricultural lands.

کلیدواژه‌ها [English]

  • Analysis of Variance
  • Kriging Method
  • Object-Oriented Classification
  • Piezometric Well
  • Zoning Map
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