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تحلیل فرایندهای درونرگباری تحویل رسوب معلق تعدادی از زیرحوضههای دریاچة زریوار به کمک الگوی حلقههای رسوبی | ||
نشریه علمی - پژوهشی مرتع و آبخیزداری | ||
مقاله 8، دوره 68، شماره 2، شهریور 1394، صفحه 323-340 اصل مقاله (1.21 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/jrwm.2015.54933 | ||
نویسندگان | ||
سید حمید رضا صادقی* 1؛ شیرکوه ابراهیمی محمدی2؛ کامران چپی2 | ||
1استاد گروه آبخیزداری، دانشکدة منابع طبیعی، دانشگاه تربیت مدرس | ||
2استادیار گروه مرتع و آبخیزداری، دانشکدة منابع طبیعی، دانشگاه کردستان | ||
چکیده | ||
رفتار رسوب معلق در طول رگبارها نهتنها تابعی از شرایط انرژی از قبیل ذخیرة رسوبات در دبیهای کم و حمل آن در دبیهای زیاد است، بلکه با تغییرات تولید رسوب و کاهش آن نیز مرتبط است. تغییرات موجودیت رسوب باعث ایجاد اثری به نام الگوی حلقة رسوبی میشود. تحلیل الگوهای حلقههای رسوبی اهمیت فراوانی در مطالعات رسوب حوضههای آبخیز دارد؛ حال آنکه به تحلیل آنها کمتر توجه شده است. بنابراین، در این مطالعه، بر اساس دادههای دبی و غلظت رسوب معلق 8 واقعة بارندگی اتفاقافتاده از فروردین 1390 تا اردیبهشت 1391، تغییرات درونرگباری غلظت رسوب معلق 6 زیرحوضة دریاچة زریوار در قالب الگوهای حلقههای رسوبی بهدست آمد. بر اساس تحلیل نتایج، حلقههای رسوبی بهدستآمده دارای 16 الگوی ساعتگرد، 13 الگوی بینظم، 11 الگوی پیچیده، و 6 الگوی پادساعتگرد بود. زیرحوضههای کوچک آبخیز دریاچة زریوار پاسخهای سریعی به تغییرات شدت رگبارها نشان داد و اکثر آبنمودهای ثبتشده از رگبارهای مختلف دارای چند دبی اوج و، به تبع آن، تغییرات فراوان غلظت رسوب معلق بودـ که خود باعث ایجاد الگوهای متفاوت حلقة رسوبی شد. تنوع الگوهای حلقههای رسوبی نهتنها بیانگر پیچیدگی حمل رسوب در درون وقایع رگباری بود، بلکه از رگباری به رگبار دیگر نیز تغییر کرد. برقراری رابطة معنیدار آماری (01/0>p) بین آورد کل رسوب و دبی اوج وقایع رگباری هر نقطة نمونهبرداری بیانگر این واقعیت بود که، بهرغم تفاوتهای تغییرات درونرگباری غلظت رسوب معلق، میتوان اثر کلی همة وقایع را در هر نقطة نمونهبرداری با یک معادلة سادة رگرسیونی توصیف کرد. | ||
کلیدواژهها | ||
واژگان کلیدی: تغییرات زمانی رسوب؛ تولید رسوب؛ دبی اوج؛ رسوب معلق؛ رسوبنمود | ||
مراجع | ||
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