بررسی میزان تولید رسوب معلق حوزه آبخیز زیارت، گرگان در فصل های مختلف با استفاده از تکنیک منشایابی رسوب

نوع مقاله : پژوهشی

نویسندگان

1 دانشیار، دانشکدۀ علوم زمین، دانشگاه شهید بهشتی، تهران

2 کارشناس ارشد ژئومورفولوژی دانشگاه شهید بهشتی، تهران

چکیده

‌فرسایش خاک جدی‏ترین و غیرقابل‏برگشت‏ترین تهدید برای توسعۀ پایدار به‌شمار می‏رود. با توجه به روند افزایشی نرخ فرسایش و تولید رسوب، هدف از این پژوهش تعیین سهم نسبی هریک از واحدهای فرسایشی سطحی و زیرسطحی در حوضۀ آبخیز زیارت گرگان در سه فصل پاییز، زمستان و بهار با استفاده از فن منشأیابی رسوب است. بدین‌منظور تعداد 43 نمونه از منابع رسوب شامل کاربری‏های مرتع و کشاورزی (منابع سطحی) و کنار جاده و فرسایش کناره‏ای آبراهه (منابع زیرسطحی) و 14 نمونه از رسوبات معلق خروجی حوضه جمع‏آوری و غلظت 10 عنصر ژئوشیمیایی، به‌علاوۀ کربن آلی و سزیم 137 در نمونه‏ها اندازه‏گیری شد. با استفاده از آزمون‏های کروسکال والیس و تحلیل تشخیص ترکیب بهینه ردیاب‏ها تعیین شدند. درنهایت، با استفاده از مدل چندمتغیرۀ ترکیبی سهم نسبی هریک از منابع فرسایش در تولید رسوب در فصل‏های یادشده تعیین شد. نتایج نشان داد بیشترین سهم مربوط به فرسایش سطحی (کشاورزی و مراتع) در دو فصل زمستان و بهار است. همچنین فرسایش زیرسطحی (جاده و آبراهه) در فصل بهار با 4/60 درصد، میزان شایان ‏توجهی را به خود اختصاص داده است. نتایج این پژوهش می‏تواند در انتخاب روش مدیریت فرسایش و رسوب حوضۀ آبخیز زیارت در فصل‏های مختلف به‌کار آید.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating suspended sediment yield in Ziarat Drainage Basin, Gorgan in different seasons using sediment fingerprinting technique

نویسندگان [English]

  • Kazem Nosrati 1
  • Saeede Jalali 2
1 Associate Professor, Faculty of Earth Science, Shahid Beheshti University, Tehran, Iran
2 MA Student in Geomorphology, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Soil erosion is the most serious and irreversible threat to sustainable development. According to the increasing rate of soil erosion and sediment yield, the current study aimed to determine relative contribution of sediment sources in Ziarat catchment in fall, winter and spring seasons using sediment fingerprinting technique. In this regard, 43 samples from sediment sources including rangeland and cultivated land as surface erosion and stream bank and road verges as sub-surface erosion as well as 14 samples of suspended sediment at outlet of catchment were collected and concentration of geochemical tracers, organic carbon and 137Cs were measured. The optimum set of tracers was selected using the Kruskal-Wallis H test and discriminant function analysis. Finally, the relative contribution of sediment sources was determined through mixing model in different seasons. The results showed that the maximum relative contribution was related to surface erosion in winter and spring seasons. Sub-surface erosion in spring season with 60.4% also caused a large amount of sediment yield. The results of this study can be used to select the management strategies in soil erosion and sediment control of Ziarat catchment in different seasons.

کلیدواژه‌ها [English]

  • Sediment fingerprinting
  • seasonal erosion
  • 137Cs
  • Ziarat catchment
 
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