ارتباط ضریب جریان با رطوبت سطحی خاک و سطح تراز ایستابی آب‌های زیرزمینی (مطالعه موردی: عجب‌شیر)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد منابع آب دانشکده کشاورزی، دانشگاه تبریز

2 استاد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه تبریز

چکیده

کاهش سهم جریان ورودی رودخانه­ها به مخازن آب کشور ازجمله دریاچه ارومیه از مهم­ترین مسائل روز صنعت آب کشور است بنابراین نقش ضریب جریان برای تعیین جریان ناشی از هر بارش به‌منظور پیش­بینی و مدیریت جریان رودخانه حائز اهمیت است. رطوبت خاک، به‌ویژه رطوبت خاک سطحی، نقش بسزایی در چرخه آبی طبیعت، خصوصاً در توزیع بارش و تبدیل آن به رواناب و نفوذ، ایفا می‌نماید. جریان رودخانه از طریق نفوذ همواره بر سطح تراز ایستابی آب­های زیرزمینی تأثیرگذار است. لذا بررسی ارتباط ضریب جریان با رطوبت سطحی خاک و تراز سطح ایستابی به‌منظور تعیین حجم مقادیر رواناب ناشی از بارش می­تواند یکی از مهم­ترین مسائل درزمینه مدیریت منابع آب ­باشد. در این تحقیق از تصاویر سنجنده مودیس جهت برآورد تغییرات مکانی و زمانی رطوبت خاک استفاده گردید و ارتباط ضریب جریان لحظه­ای (رویداد‌های بارش-رواناب) با تراز سطح ایستابی روزانه و همچنین ارتباط آن با رطوبت سطحی خاک روزانه مستخرج از تصاویر مودیس در دو ایستگاه هیدرومتری واقع در ابتدا و انتهای رودخانه­ی قلعه چای که‌ به دریاچه ارومیه تخلیه می­گردد، بررسی شد. نتایج حاکی از آن بود که رابطه مستقیم بین ضریب جریان و تراز سطح ایستابی برای ایستگاه­های شیشوان و ینگجه با ضریب همبستگی 9/0 و 84/0 وجود دارد، همچنین ارتباط مستقیم ضریب جریان با رطوبت سطحی خاک روزانه برای ایستگاه­های شیشوان و ینگجه با ضریب همبستگی 792/0 و 815/0 محاسبه گردید.

کلیدواژه‌ها


عنوان مقاله [English]

Relationship of Runoff Coefficient with The Surface Soil Moisture and Groundwater Level (Case Study: Ajabshir Basin)

نویسندگان [English]

  • A Asry 1
  • R Salehinia 1
  • A Fakherifard 2
1 M.Sc. Student in Water Resources Engr., Dept. of Water Engin., Faculty of Agric., Univ. of Tabriz, Iran
2 Prof., Dept. of Water Engr., Faculty of Agric., Univ. of Tabriz, Iran
چکیده [English]

Reduction of rivers inflow which discharge to reservoirs of the country such as Lake Urmia is the most important present problem of water industry. so the role of runoff coefficient to determine the runoff arising from precipitation in order to anticipate and manage the stream flow is of great importance.Soil moisture, especially surface soil moisture, plays an important role in the natural water cycle in nature particularly in the distribution of rainfall and its turn into runoff and infiltration. On the other hand, stream flow always affects the level of the groundwater table. Therefore, the relationship between the runoff coefficient with surface soil moisture and water table level in order to determine the volume of runoff arising from precipitation can be one of the most important issues in the field of water resources management. In this study, MODIS satellite images were used to estimate the spatial and temporal variations of soil moisture and relationship between instantaneous runoff coefficient (events) and daily groundwater table level, as well as its relation with daily surface soil moisture extracted from the  atellite images for the two hydrometric stations located at the beginning and end of the Ghaleh­­­_Chay river discharging into the Lake Urmia were investigateResults of this research confirmed the existence of a direct relationship between the runoff coefficients and water table at the Shishavan and Yengejeh stations with a correlation coefficient 0.9 and 0.84 respectively.Also direct connection between the runoff coefficient and daily surface soil moisture was registered with correlation coefficient of 0.792 and 0.815 at the stations of Shishavan and Yengejeh, respectively.

کلیدواژه‌ها [English]

  • Ghaleh-Chay
  • MODIS Satellite images
  • Runoff coefficient
  • River
  • Surface soil moisture
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