نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مرتع و آبخیزداری دانشگاه ارومیه

2 هیات علمی دانشگاه ارومیه

3 عضو هیئت علمی

چکیده

تاکنون شاخص­های مختلفی برای فرسایندگی باران ارائه‌شده‌اند که از میان آن­ها شاخص (EI30) R در مدل USLE از مقبولیت بیشتری برخوردار است. این پژوهش با هدف تعیین شاخص فرسایندگی باران (EI30) در استان آذربایجان غربی انجام گرفت. به‌منظور برآورد شاخص یادشده از تحلیل رگرسیونی بین این شاخص و برخی از شاخص­های زودیافت در 13 ایستگاه مجهز به باران‌نگار استفاده شد. شاخص EI30 بیش‌ترین همبستگی را با شاخص فورنیه اصلاح‌شده کلی ) 9/0R2 =) نشان داد. سپس مقدار شاخص EI30 برای 66 ایستگاه باران‌سنجی با طول دوره­ آماری مشترک 20 سال (2012 – 1993) محاسبه شد. نتایج نشان داد که تغییرات شاخص EI30 در استان بسیار زیاد بوده و در دامنه­ ۵۴/۶۲ تا ۰۵/۲۳۰ مگاژول میلی­متر در هکتار در ساعت در سال قرار دارد. حداکثر فرسایندگی در جنوب غربی استان و حداقل آن در مناطق شمالی و شرق استان مشاهده شد.

کلیدواژه‌ها

عنوان مقاله [English]

Rainfall Erosivity Mapping for West Azerbaijan Province

نویسندگان [English]

  • tara shahhosein 1
  • Habib Nazarnejad 2
  • farrokh Asadzadeh 3

1 Department of Range and Watershed Management, Urmia University

2 Urmia University

3 Department of Soil Science, Urmia University

چکیده [English]

So far, various indices have been proposed for rainfall erosivity, among which (EI30) R in the USLE model is more acceptable. The aim of this study was to determine the rain erosivity index (EI30) in West Azerbaijan province. In order to estimate the mentioned index, regression analysis between this index and some premature indices was used in 13 stations equipped with rain gauge. The EI30 index has the highest correlation with the overall corrected Fournier index (R2 = 0.9). Then, the EI30 index was calculated for 66 paranormal stations with a common statistical period of 20 years (1993-2012). The results showed that the changes in the EI30 index in the province are very high and are in the range of 62.54-230.05 mega Joule millimeters per hectare per hour per year. The highest erosivity was observed in the southwest of the province and the lowest in the northern and eastern regions of the province.

کلیدواژه‌ها [English]

  • EI30 Index
  • Fournier index
  • Rainfall Kinetic energy
  • Rain erosivity
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