نویسندگان
1
دانشجویان دکتری، علوم و مهندسی آبخیز، دانشکده منابع طبیعی و علوم دریایی نور، دانشگاه تربیت مدرس تهران
2
استاد گروه آبخیزداری، دانشکده منابع طبیعی و علوم دریایی نور، دانشگاه تربیت مدرس تهران
چکیده
فرآیندهای زمینساختی فعّال در حوزههای آبخیز باعث تشکیل پدیدههای مختلف از قبیل مخروط افکنهها، تراسها و گسلها میگردد و مسبب بروز تغییرات مختلف در ریختسنجی حوضهها میباشد. پژوهش حاضر با هدف شناخت ویژگیهای مورفولوژیک حوزه آبخیز شارقنج بیرجند صورت گرفته است. برای انجام این پژوهش از مدل رقومی ارتفاع 30 متر، نقشه زمینشناسی(1:25000)، نقشه توپوگرافی(1:25000)، نرم افزار GIS10.8،EXCEL ، بازدیدهای میدانی، شاخصهای رتبهبندی هورتن، ضریب شکل حوضه، نسبت شکل، ضریب فشردگی، شاخص تراکم سطحی آبراهه، انشعابپذیری، انتگرال هیپسومتری، نسبت ناهمواری، ضریب ناهمواری، شیب زمین، برجستگی نسبی، درجه میانبری مئاندری و گرادیان طولی رودخانه استفاده شد. نتایج نشان داد بر اساس رتبهبندی هورتن بالاترین رتبه آبراهه حوضه شش میباشد. همچنین ضریب شکل، نسبت شکل و ضریب فشردگی حوضه به ترتیب 2/0، 4/2 و 02/2 محاسبه گردید. شاخصهای انتگرال هیپسومتری، نسبت و ضریب ناهمواری، شیب زمین به درجه و برجستگی نسبی نیز به ترتیب 5/0، 62/0، 609، 25 و 428 به دست آمد. براین اساس حوضه به لحاظ شکل، کشیده و از پستی و بلندیهای جوان برخوردار است. به لحاظ فعالیتهای نئو در منطقه، شاخص LAT ، 25/4 برآورد گردید و حوضه در گروه چهار این تقسیم بندی واقع شده و از شدت فعالیت نئوتکتونیکی کمی برخوردار است.
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