بررسی تاثیر خشک‌سالی بر منحنی تداوم جریان درآبخیزهای کارستی مطالعه موردی:حوضه کاکارضا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه پژوهشی حفاظت آب و خاک، پژوهشکده حفاظت خاک و آبخیزداری، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

2 استادیار، گروه پژوهشی هیدرولوژی و توسعه منابع آب، پژوهشکده حفاظت خاک و آبخیزداری، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

10.22034/jewe.2021.265822.1499

چکیده

منحنی تداوم جریان، یکی از معیار­های مناسب­ شناخت پاسخ هیدرولوژیک آبخیز­­­ها است. شناخت برهمکنش پدیده خشک­سالی با شاخص­های منحنی تداوم جریان (FDC)، ابزاری مناسب برای مدیریت بهینه منابع آب آبخیز است. هدف پژوهش حاضر، بررسی رابطه زمانی خشک­سالی و شاخص­های FDC در آبخیز کارستی کاکارضا است. در این پژوهش ابتدا دوره مشترک (1396-1361) برای ایستگاه­های آب­سنجی و باران­سنجی متناظر در نظر گرفته شد. سپس شاخص بارش استانداردشده (SPI) و شاخص دبی استانداردشده (SDI) در مقیاس‌های زمانی 3، 6، 9 و Mon 12 محاسبه شد. FDC و تداوم جریان ترسیم و شاخص­های منحنی محاسبه و استاندارد شد. روابط شاخص خشک­سالی با شاخص­های FDC با استفاده از روش همبستگی، بررسی و تحلیل شد. نتایج نشان داد که روند کلی تغییرات دو شاخص SPI و SDI در پایه­های زمانی متناظر، از هم تبعیت می­کند. ولی بیش­ترین تطابق روندها مربوط به گام زمانی سه ماه است. میزان تغییرات نسبی در بخش شاخص­ کم­آبی (Q90/Q50)، بسیار کم و در حد 6/0% و در بخش پر­آبی (Q25/Q50) در حد 41/4% بود. همبستگی بین شاخص­های استانداردشده منحنی تداوم جریان و منحنی تداوم بارش، ضریب تبیین 904/0 را نشان داد. تغییرات شاخص شکل FDC در محدوده 5/0 تا 5% و روند تغییرات آن در طول دوره پژوهش با شیب ملایم، افزایشی است. میزان کم تغییرات شاخص­های FDC و شاخص شکل منحنی، نقش پدیده کارست در تعیین شکل FDC و همچنین کنترل نوسانات جریان و تأمین جریان­های پایدار در دوره خشک­سالی را نشان داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the Impact of Drought on Flow Duration Curve in Karst Catchments (Case study: Kaka-Reza Catchment)

نویسندگان [English]

  • Rahim Kazemi 1
  • Bagher Ghermezcheshmeh 2
1 Assist. Professor, Hydrology and Water Resources Development Research Group, Soil Conservation and Watershed Management Research Institute, Agricultural Research, Education and Extension Organization, Tehran, Iran
2 Department of Hydrology and water resources development, Soil Conservation and Watershed management institute
چکیده [English]

Flow duration curve (FDC) is one of the most appropriate criteria for recognizing the hydrological response of catchments. Understanding the interaction of drought phenomenon along with FDC indices is a suitable tool for optimal water resources management of catchment. The aim of this study was to investigate the temporal relationship between drought and FDC indices in the Kaka-Reza, karstic catchment. In this study, the common period (1982-2017) was considered for the corresponding hydrometric and rain gauge stations. The standardized precipitation index (SPI) and standardized discharge index (SDI) were then calculated at time scales of 3, 6, 9, and 12 months. Precipitation duration curve (PDC) and FDC were plotted and curve indices were calculated and standardized. The relationships between drought index and FDC indices were investigated and analyzed. The results showed the general trend of changes in SPI and SDI in the respective time scales follow each other. However, the most consistent trends are related to the time step of three months. The rate of relative changes in the section of low flow indices (Q90/Q50) were very small and around 0.6% and in the high flow (Q25/Q50) was around 4.41%. The correlation between FDC and PDC showed coefficient of determination of 0.904. The rate of slope change was from 0.5 to 5% and trend of its changes was a slight upward slope during the research period. The small amount changes of FDC indices and slope of FDC showed the role of karst phenomenon in determining the shape of FDC as well as controlling flow fluctuations and providing stable flow during the drought period.

کلیدواژه‌ها [English]

  • Hydrologic response
  • Karst water resource
  • Precipitation duration curve
  • Standardized precipitation index
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