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.
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