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ارزیابی تغییرات زمانی و مکانی شاخص سلامت هیدرولوژیک رودخانه در حوزه‌های آبخیز استان اردبیل | ||
| اکوهیدرولوژی | ||
| مقاله 8، دوره 4، شماره 2، تیر 1396، صفحه 379-393 اصل مقاله (997.23 K) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2017.61475 | ||
| نویسندگان | ||
| سعید خروشی1؛ رئوف مصطفی‌زاده* 2؛ اباذر اسمعلی عوری3؛ مجید رئوف4 | ||
| 1دانشجوی کارشناسی ارشد آبخیزداری، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی | ||
| 2استادیار گروه مرتع و آبخیزداری، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی | ||
| 3دانشیار گروه مرتع و آبخیزداری، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی | ||
| 4دانشیار گروه مهندسی آب، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی | ||
| چکیده | ||
| ارزیابی سلامت رودخانه میتواند بهعنوان ابزاری در برآورد جریان زیستمحیطی و کمیکردن مقدار، زمانبندی و کیفیت جریان آب مورد نیاز در تداوم حیات اکوسیستمهای رودخانهای استفاده شود. هدف از مطالعۀ حاضر، تعیین روند تغییرات زمانی و مکانی سلامت رودخانههای استان اردبیل با تأکید بر شاخصهای هیدرولوژیک جریان با استفاده از آزمونهای آماری است. بدین‌منظور از دادههای دبی روزانۀ ایستگاههای هیدرومتری طی دورۀ آماری 1367ـ 1390 برای تجزیه و تحلیل سلامت رودخانه و از آزمون ناپارامتریک من‌ـ کندال و روش تخمینگر سن به‌منظور تعیین وجود داشتن یا نداشتن روند مثبت و منفی در سطوح مختلف آماری استفاده شد. همچنین پس از تقسیمبندی دورۀ آماری موجود به چهار دورۀ پنج‌ساله، از آزمون کروسکال والیس برای بررسی تغییرات زمانی و وجود تفاوت در دورههای کوتاهمدت استفاده شد. نتایج پژوهش روند کاهشی معنادار سلامت رودخانه در ایستگاههای مطالعه‌شده (13 ایستگاه از 24 ایستگاه) را نشان داد. ایستگاههای سولا و فیروزآباد روند افزایشی معناداری داشتند و در ایستگاههای باقیمانده روندی معنادار تشخیص داده نشد. با توجه به نتایج به‌دست‌آمده از نقشههای تغییرات مکانی سلامت رودخانه، بیشترین تغییر وضعیت شاخص سلامت رودخانه در بخش مرکزی و کمترین تغییرات و کاهش شاخص یادشده در قسمتهای شمالی و جنوبی استان مشاهده شد. در مجموع، میتوان گفت که میزان تغییرات و کاهش درجۀ سلامت هیدرولوژیک جریان در دورههای اخیر بسیار بیشتر از گذشته بوده است که میتواند با افزایش شدت بهرهبرداری از منابع آب سطحی و کاهش آبدهی بر اثر تغییرات اقلیمی مرتبط باشد. | ||
| کلیدواژه‌ها | ||
| آب های سطحی؛ آزمون من‌ـ کندال؛ تغییرات دبی؛ رژیم جریان؛ شاخص هیدرولوژیک | ||
| عنوان مقاله [English] | ||
| Spatiotemporal assessment of the hydrologic river health index variations in Ardabil Province Watersheds | ||
| نویسندگان [English] | ||
| Saeid Khorooshi1؛ Raoof Mostafazadeh2؛ Abazar Esmali Ouri3؛ Majid Raoof4 | ||
| 1MA Student, Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Iran | ||
| 2MA Student, Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Iran | ||
| 3MA Student, Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Iran | ||
| 4Associate Professor, Department of Water Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Iran | ||
| چکیده [English] | ||
| Assessment of river health can be used as a tool for environmental flow estimation and quantification of the amount, timing and required water flow quality for permanence of river ecosystems. The current study aims to determine the spatial and temporal changes of rivers health with an emphasis on hydrologic indicators by using statistical tests in Ardabil province. For this purpose, the daily discharge data of 24 hydrometric stations with the period of 1367-1390 was used for river health analysis. In addition, the non-parametric Mann-Kendall test and Sen's estimator method were performed to determine the presence or absence of positive and negative trends at different statistical levels. Also, after dividing the existed study span into four periods, the Kruskal–Wallis test was applied for the investigation of temporal variations and the existence of differences between short-term periods. Results showed a significant decreasing trend of river health in studied stations (13 stations from 24 stations). Sula and Firuzabad stations had significant increasing trend and in other remained stations, no significant trend was identified. According to the results obtained from the maps of spatial variability of river health, maximum and minimum change of river health indicators were observed in the central part, and northern and southern parts of the province, respectively. Generally, it can be said that, recently, the overall changes as well as reduction in hydrologic flow health have been more compared to the past which can be associated with increase of exploitation intensity from surface water resources as well as reduction in the water yield due to climate change. | ||
| کلیدواژه‌ها [English] | ||
| Surface waters, Mann-Kendall Test, discharge variations, Flow regime, hydrologic index | ||
| مراجع | ||
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