اثر خشکسالی هواشناسی بر منابع آب زیرزمینی (مطالعه موردی: آبخوان کمیجان استان مرکزی)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار/ گروه مهندسی علوم خاک، دانشکده کشاورزی، دانشگاه ملایر.

2 دانشجوی کارشناسی ارشد/ مهندسی منابع آب، دانشکده کشاورزی، دانشگاه ملایر.

3 کارشناس /سازمان مدیریت منابع آب کشور.

چکیده

هدف از این پژوهش بررسی نوسانات عمق آب زیرزمینی تحت تاثیر خشکسالی هواشناسی در آبخوان کمیجان است. بدین منظور با دریافت اطلاعات 32 چاه پیزومتری و سه ایستگاه هواشناسی کمیجان، قهاوند و خنداب واقع در محدوده آبخوان، اثر خشکسالی هواشناسی از طریق شاخص‌های خشکسالی بارش استاندارد شده (SPI)، درصد نرمال (PNI) و دهک‌ها (DI) بر شاخص آب‌های زیرزمینی (GRI) مطالعه شد. بررسی‌ها براساس آزمون همبستگی پیرسون در مقیاس ماهانه و تاخیرهای زمانی 1، 3، 6، 9، 12، 18، 24 و 48 ماهه انجام گرفت. نتایج نشان داد وقوع هر سه شاخص خشکسالی هواشناسی با تاخیر 9 ماهه، بیشترین تاثیر را در شاخص آب زیرزمینی منطقه مورد مطالعه داشت. هم‌چنین نتایج درصد ایستگاه‌های دارای همبستگی معنی‌دار GRI با SPI، DI و PNI به‌ترتیب 14/20، 43/27 و 25/31 درصد می‌باشد. مقایسه میانگین عمق آب در سال‌های خشک و تر نیز بیانگر آن بود که وقوع خشکسالی منجر به افت ارتفاع آب به‌میزان 17/1 متر شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Meteorological Drought on Groundwater Resource (Case Stusy: Komijan Aquefer in Markazi Province)

نویسندگان [English]

  • M. Bayat-Varkeshi 1
  • M. Farahani 2
  • M. Ghabaei Sough 3
1 Assistant Professor, Department of Soil Science, Agriculture Faculty, Malayer University, Malayer, Iran.
2 M.Sc. Student of Water Resource Engineering, Agriculture Faculty, Malayer University, Malayer, Iran.
3 Expert Member of Iran Water Resources Management Company, Tehran, Iran.
چکیده [English]

The purpose of this study was evaluation of the groundwater depth changes under meteorological drought in Komijan aquifer. For this reason, the data of 32 piezometric wells and three meteorological stations of Komijan, Ghahavand and khondab located around the aquifer, the effects of drought through the Standardized Precipitation Index (SPI), the percentage of normal (PNI) and deciles (DI) on groundwater Index (GRI) were studied. Assessments were based on Pearson correlation analysis on monthly scale and the time lag of 1, 3, 6, 9, 12, 18, 24 and 48 months. The results showed that each three drought indexes had more effective on groundwater index with 9 months time lag. Also, the percentage of stations wich had GRI significant correlation with SPI, DI and PNI were 20.14, 27.43 and 31.25 %, respectively. The average of gwoundwater depth in dry and wet years indicated that drought event led to reduced 1.17 m water height.

کلیدواژه‌ها [English]

  • Groundwater
  • SPI
  • PNI
  • DI
  • GRI
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