بررسی آستانه‌های توپوگرافیکی وتحلیل نقش نوع سازندهای سطحی در توسعه خندق‌ها در دامنه‌های کوهستان‌های نواحی نیمه خشک مطالعه موردی: حوضه شورچای

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