ارزیابی روش های پهنه بندی فرسایش خندقی (مطالعه موردی: حوزه آبخیز آبگندی)

نوع مقاله : پژوهشی

نویسندگان

1 استادیار، مرکز تحقیقات آبخیزداری استان کهگیلویه و بویراحمد

2 دانشیار، پژوهشکدۀ حفاظت خاک و آبخیزداری

3 دانشجوی دکتری آبخیزداری، دانشگاه هرمزگان

چکیده

فرسایش خندقی یکی از فرایندهای فرسایشی است که به‌طور گسترده‏ای بر شکل ظاهری زمین اثر می‏گذارد. توسعۀ خندق سبب هدررفت مقدار زیادی خاک می‌شود. از این‌رو، می‏توان از آن به‏عنوان یکی از علل اصلی تخریب زمین و محیط ‏زیست نام برد. در این تحقیق مدل ارائه‌شده برای پهنه‏بندی فرسایش خندقی در شرایط مناطق خشک و نیمه‌خشک، به‌منظور واسنجی و اعتبار‌یابی آن در استان کهگیلویه و بویراحمد بررسی شد. بنابراین، با بررسی پراکنش فرسایش خندقی در سطح استان، حوضۀ آبگندی انتخاب و برای انجام تحقیق در نظر گرفته شد. در این حوضه با تهیۀ نقشه‏های مختلف کاربری اراضی، واحدهای اراضی، سنگ‌شناسی، شیب، نقشۀ واحد کاری استخراج و بر‌اساس آن واحدهای کاری انتخاب شد. در هر واحد کاری از طریق نقشه‌برداری خندق‏ها خصوصیات ظاهری و مورفومتری خندق‏ها استخراج شد. در هر واحد وضعیت نفوذ‌پذیری و درصد حفاظت روی خاک نیز بررسی شد. همچنین ارزش کمی شش لایه نقشۀ ورودی به مدل (شامل سنگ‌شناسی، درصد شیب زمین، نوع خاک، متوسط بارندگی سالانه، نوع استفاده از زمین و درصد حفاظ روی خاک) تعیین شد. درنهایت، براساس آن نقشۀ پهنه‏بندی فرسایش خندقی با استفاده از روش یا مدل شاخص همپوشانی و عملگرهای جمع جبری فازی، ضرب جبری فازی و گامای فازی در محیط GIS شد. با توجه به نتایج به‏دست‏آمده و با در‌نظر‌گرفتن مساحت پهنه‌های مختلف و میزان خندق‏های رخ‌داده در هر‌یک از آنها، مدل گامای فازی 8/0 مناسب‌ترین روش پهنه‏بندی فرسایش خندقی در حوضۀ مطالعه‌شده است.
 
 
 
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Assessment of Gully Erosion Zonation Methods (Case study: Abgendi Watershed)

نویسندگان [English]

  • Abdal Shahrivar 1
  • Samad Shadfar 2
  • Majid khazae 3
  • Behzad Adeli 3
1 Center of Watershed Management Research of Kohgiluyeh and Boyer-Ahmad, Iran
2 Soil Conservation and Watershed Management Research Institute, Iran
3 PhD. Student in watershed engineering, Hormozgam University, Iran
چکیده [English]

Surface. The development of gullies causes the loss of a great amount of soil and could be considered as one of the principal causes of geo-environmental degradation. In this research FAZI model introduced for gully erosion zonation in arid and semiarid area considered to calibration and validation in Kahkiloeh and Boyerahmad Province. Therefore, the ABGANDI watershed were selected by consideration of gully erosion distribution in Kahkiloeh and Boyerahmad Province. In this region the maps of lithology, slope, soil, rainfall, land cover and land use were extracted and thus selected the working units. In each of the units, gullies morphometric, soil penetration condition and soil conservation percent characteristics with survey investigated. Also, determinates the quantity value of six maps model input layer include (lithology, percent of slop, soil type, annual average precipitation, land use and percent of soil conservation) was determined. Finally, gully erosion mapping using overlay index, fuzzy algebraic sum, fuzzy algebra product and fuzzy gamma in GIS performed. Obtained result of different regions indicated that the fuzzy gamma model 0.8 is the proper method to gully erosion zoning in studied watershed.
 
 
 
 

کلیدواژه‌ها [English]

  • Abgendi Watershed
  • Fuzzy
  • Gully erosion
  • modeling
  • Zonation
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