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سهم برآورد رواناب ناشی از ذوب برف در تامین نیاز آبی اراضی زراعی زیرحوضه چهل‌گزی، استان کردستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد مهندسی آبخیزداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

2 دانشیار گروه مهندسی آبخیزداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

3 استادیار پژوهشی مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی کردستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، سنندج، ایران

4 دانشجوی دکتری مخاطرات اقلیمی، دانشکده ادبیات و علوم انسانی، دانشگاه رازی، کرمانشاه، ایران

چکیده

با توجه به اهمیت و نقش پوشش برف در مدیریت و تامین منابع آبی حوضه‌­های کوهستانی، مطالعه حاضر با استفاده از مدل SRM و تصاویر سنجنده مادیس، برای برآورد رواناب ناشی از ذوب برف و مدل CROPWAT، به‌­منظور تعیین نیاز آبی اراضی زراعی زیرحوضه چهل­‌گزی واقع در استان کردستان با هدف تعیین سهم برآورد رواناب حاصل از ذوب برف این زیرحوضه در تامین نیاز آبی اراضی زراعی آن، طی سال­های 1391 تا 1393 انجام شده است. نتایج حاصل از این پژوهش نشان می­دهد، مدل SRM قادر به برآورد رواناب ناشی از ذوب برف با ضریب تبیین و درصد تفاضل حجمی به‌ترتیب 0.97 و 0.14 برای سال واسنجی 1391 تا 1392 و 0.96 و 0.66 برای سال اعتبارسنجی 1392 تا 1393، می‌باشد. همچنین، نتایج حاصل از مدل CROPWAT، میزان نیاز آبی اراضی زراعی زیرحوضه چهل‌گزی را برابر 1939371 متر مکعب در سال بیان داشت که در نهایت سهم رواناب ناشی از ذوب برف بر اساس این نیاز برآوردی نسبت به سال واسنجی، برابر با توان 100 درصدی این رواناب در تامین نیاز آبی اراضی زراعی زیرحوضه چهل‌گزی است که بر مبنای این مطالعه، می‌­توان به ارائه الگویی برای برنامه‌­ریزی مدون براساس موجودیت آب در این زیرحوضه پرداخت.

کلیدواژه‌ها

عنوان مقاله [English]

Estimation of snowmelt runoff in water requirement of farmland in Chehelgazi Sub-basin, Kurdistan Province

نویسندگان [English]

  • Seyed Pedram Nainiva 1
  • Kaka Shahedi 2
  • Salahudin Zahedi 3
  • Hersh Entezami 4

1 MSc, Faculty of Natural Resources, Sari University of Agricultural Sciences and Natural Resource, Iran

2 Associate Professor, Faculty of Natural Resources, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran

3 Associate Professor, Soil Conservation and Watershed Management Department, Kurdistan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization(AREEO), Sanandaj, Iran

4 PhD Student of Climatology (Climatic Hazards), Department of Geography, Razi University, Kermanshah, Iran

چکیده [English]

Snow cover has a significant role in management and supply of water resources in mountainous basins. In this order, this study aimed at estimating of contribution the snowmelt runoff in Chehelgazi Sub-basin at Kurdistan Province in supplying water requirements of its farmlands during 2012 and 2014. To do so, SRM model and MODIS satellite images were applied to estimate runoff from the snowmelt and CROPWAT model was implemented to determine water requirements of farmlands. Through the findings, it was found that SRM model with coefficient of determination (R2) of 0.97 and volume difference percentage of 0.14 for the calibration year (2012-2013) and coefficient of determination of 0.96 and volume difference percentage of 0.66 for validation year (2013-2014) was able to estimate snowmelt runoff. Moreover, the result from CROPWAT model showed that water requirement for farmlands in Chehelgazi Sub-basin was 1939371 m3yr-1. Ultimately, it was shown through the model that runoff from the snowmelt has 100 % potential in supplying water requirements in the basin. The result from this study can be used to provide a model for water planning in Chehelgazi Sub-basin.

کلیدواژه‌ها [English]

  • MODIS images
  • CROPWAT model
  • Mountainous basins
  • SRM model
  • Snow cover
مراجع

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مهندسی و مدیریت آبخیز
دوره 12، شماره 4
دی 1399
صفحه 962-976
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