Effect of Topographic Factors on Gully Initiation (Case study: Dareshahr Area-Ilam Province)

Message:
Abstract:
Gully erosion is one of important erosion forms in Dareshahr، the Ilam province. The present study therefore aimed to recognize the watershed characteristics affecting gully development and dominant processes in gully initiation. Towards this attempt، 18 gullies with three types distributed in different topographic and soil characteristics were selected. Their associated relationships were then established. The results of topographic characteristics showed that the relation between slope and drainage area of linear gullies in rangeland areas was negative. The critical threshold area for gully development in slope of 12% was 6ha، highlighting the important role of surface runoff in the formation and development of gullies. However، no meaningful relationship could be established between slope and drainage area of frontal and digitated gullies. This confirms the significant effect of other factors compared to surface runoff influence. The study of gullies in different geologic formations also revealed that the sub-surface runoff plays an important role in Gsachsaran and Quaternary formations in the formation and development of gullies. In contrast، the Hortonian runoff was responsible for gully development in Pabadeh geologic formation. Soil sodium، silt and sand contents were also factors affecting gully topography with a reverse relationship with drainage area of the gullies.
Language:
Persian
Published:
Iranian Journal of Watershed Management Science and Engineering, Volume:7 Issue: 21, 2013
Page:
53
https://magiran.com/p1231889  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 1,390,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!