تحلیل آماری تغییرات زمانی-مکانی رخدادهای گردوغبار در استان گلستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مدیریت مناطق بیابانی، دانشکده مرتع و آبخیزداری، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 استادیار پژوهشی، بخش تحقیقات جنگل‌ها و مراتع، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان خوزستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اهواز، ایران.

‎10.22052/deej.2024.254036.1037

چکیده

وقوع گردوغبار یکی از پدیده‌های مخرب در مناطق خشک و بیابانی است که می‌تواند اثرات زیان‌باری بر روی زندگی انسان و محیط‌زیست داشته باشد. هدف اصلی این پژوهش، تحلیل مکانی-زمانی رخدادهای گردوغبار استان گلستان در طول دورۀ آماری 10 ساله (۲۰۱۳-۲۰۲۲) است. در این تحقیق، رخدادهای گردوغبار براساس فراوانی زمانی-مکانی وقوع آن برای ایستگاه‌های هواشناسی سینوپتیک (همدید) استان گلستان در طی بازۀ زمانی 10 ساله (۲۰۱۳-۲۰۲۲) مورد بررسی قرار گرفت. داده‌ها به‌صورت روزانه طی 8 دیده‌بانی در قالب کدهای سینوپتیک ارزیابی شدند. نتایج حاصل از بررسی سالیانۀ پدیدۀ گردوغبار نشان داد که منطقۀ اینچه‌برون و مراوه‌تپه بیشترین فراوانی با میانگین 8 روز گردوغباری در سال را در دورۀ مطالعاتی داشته است. نتایج نشان می‌دهد که بیشترین  فراوانی وقوع گردوغبار در استان در ماه‌های می، ژوئن و ژوئیه و کمترین فراوانی گردوغبار در ماه نوامبر و دسامبر است. همچنین نتایج درصد فراوانی گردوغبار محلی و فرامحلی طی دورۀ آماری نشان می‌دهد که 21/26 درصد و 79/73 درصد روزهای گردوغبار به‌ترتیب دارای منشأ فرامحلی و منشأ محلی بوده‌اند. همچنین تفسیر کدهای سینوپتیک در دورۀ آماری مورد بررسی نشان می‌دهد که 8/79 درصد از وقایع گردوغبار فرامحلی استان از ساعت 9:30 تا 18:30 به وقت محلی رخ می‌دهد و 64/80 درصد از وقایع گردوغبار محلی و از ساعت 9:30 تا 18:30 به وقت محلی اتفاق می‌افتد. آنالیز دورۀ تداوم رخدادهای گردوغبار در منطقۀ مورد مطالعه نشان می‌دهد که درحال حاضر اکثریت طوفان های گردوغبار دارای تداوم 1 تا 2 روزه در استان گلستان هستند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Statistical Analysis of Spatio-Temporal Variations of Dust Occurrences in Golestan Province

نویسندگان [English]

  • Faezeh Arab Ameri 1
  • Ali Mohammadian Behbahani 1
  • Majid Ownegh 1
  • Seyed Hossein Arami 2
1 Dept. of Arid Zone Management, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
2 Assistant Professor, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Ahvaz, Iran
چکیده [English]

Background and objective: Throughout recent years, the Iranian government has mainly been challenged by assessing the risk of dust storms and choosing the best method for their management. In this regard, Golestan province is subject to the high risks of intensified dust phenomenon due to its vicinity to Turkmenistan’s vast deserts, inappropriate management of its northern desert lands, and the dryness of some of its wetlands and borderlands. Therefore, considering the increasing number of intensified dust storm occurrences in Golestan province within the past few years, this study sought to perform statistical and climatic analysis of the phenomenon.
 
Materials and Methods: The dust storm occurrences in Golestan province were analyzed based on their spatio-temporal frequency as recorded by seven synoptic weather stations throughout a 10-year period (2013-2022). Moreover, the collected data were checked daily in the form of synoptic codes during eight observations using statistical methods. Finally, the average hourly, monthly, and annual occurrences of dust storms and their frequency for the hot and cold periods in all synoptic stations were calculated using the R software.
 
Conclusion: The results of the annual analysis of the dust storm revealed that the Incheh-Borun and Maraveh-Tappeh regions experienced the greatest number of dusty days in the entire study area with an average frequency of eight days per year. Moreover, it was found that the highest frequency of dust storms in the province occurred in May, June, and July, and the lowest frequency of dust storms took place in November and December, respectively. Also, the analysis of dust storm occurrences during the statistical period showed that 26.21% and 73.79% of the dusty days originated in extra-local and local origins, respectively. On the other hand, the interpretation of synoptic codes of the statistical period indicated that 79.8% of extra-local dust events in the province occurred from 9:30 A.M. to 18:30 local time and 80.64% of the events took place from 9:00 A.M. 30 to 18:30 local time. Finally, the analysis of the duration of dust events in the study area suggested that currently, the majority of dust storms in Golestan province last for one to two days.

کلیدواژه‌ها [English]

  • Dust
  • Spatio-Temporal Analysis
  • Golestan Province
  • Iran

مراجع

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مهندسی اکوسیستم بیابان
دوره 12، شماره 40
اردیبهشت 1403
صفحه 59-72

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