تحلیل سهم گردوغبارهای داخلی و خارجی و تغییرات مکانی-زمانی آنها در استان کرمان | ||
| خشک بوم | ||
| دوره 14، شماره 1، فروردین 1403، صفحه 1-19 اصل مقاله (2.65 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.29252/aridbiom.2024.20961.1979 | ||
| نویسندگان | ||
| ابوالفضل رنجبر فردوئی1؛ زهره ابراهیمی خوسفی* 2 | ||
| 1استاد گروه مدیریت و کنترل بیابان، دانشکده منابع طبیعی و علوم زمین، دانشگاه کاشان، کاشان، ایران | ||
| 2دانشیار بیابان‌زدایی، گروه علوم و مهندسی محیط‌زیست، دانشکده منابع طبیعی، دانشگاه جیرفت، جیرفت، ایران | ||
| چکیده | ||
| ذرات گردوغبار برخاسته از منابع داخلی و خارجی اثرات نامطلوبی بر سلامت عموم و محیط‌زیست دارند. با توجه به نامشخص‌بودن سهم منابع ذکرشده در تولید گردوغبار، بررسی این موضوع در مناطق مختلف ایران حائز اهمیت زیادی است. علاوه بر این، تحلیل تغییرات مکانی و زمانی رویدادهای با منشأهای مختلف می‌تواند گام مؤثری در جهت شناسایی مناطق حساس‌تر به پدیده فرسایش بادی و کاهش خطرات ناشی از وقوع آن در مناطق تحت تأثیر باشد. مطالعه حاضر با درنظرگرفتن موضوعات ذکرشده به‌عنوان اهداف اصلی انجام شد. بدین منظور از آمار پدیده گردوغبار با منشأ داخلی (کدهای 7 تا 9، 98 و 30 تا 35) و خارجی (کد 06) ثبت‌شده در 11 ایستگاه همدید استان کرمان در بازه زمانی مشترک 2002-2020 استفاده شد. پس از محاسبه فراوانی رویدادها، سهم منابع داخلی و خارجی تولید گردوغبار در مناطق مختلف استان کرمان مشخص شد. با استفاده از نقشه پهنه‌بندی شده فراوانی وقوع هر رویداد و آزمون من-کندال به‌ترتیب تغییرات مکانی و زمانی آنها تحلیل شد. نتایج نشان داد که در سه شهرستان جیرفت، انار و سیرجان سهم رویدادهای با منشأ خارج ایستگاهی بیشتر از سایر مناطق استان و به ترتیب حدود 80%، 8/53% و 2/53% بوده است. سهم رویدادهای با منشأ داخلی در شهربابک، رفسنجان، شهداد و بافت بیش از 73% و در زرند، کرمان، بم و کهنوج بیش از 52% بوده است. به‌طور متوسط سهم رویدادهای داخلی و خارجی در استان کرمان به ترتیب 6/60% و 4/39% برآورد گردید. الگوی پراکنش مکانی گردوغبارها نشان داد که بم و جیرفت به‌عنوان حساس‌ترین مناطق به فرسایش بادی در سال‌های گذشته بوده‌اند. در دوره زمانی موردمطالعه، روند تغییرات رویدادهای با منشأ داخل و خارج ایستگاه در شهداد و زرند، افزایشی معنی‌دار بوده است. روند افزایشی معنی‌دار رویدادهای با منشأ داخلی در کهنوج، رفسنجان و انار و روند افزایشی گردوغبارهای با منشأ خارج ایستگاه در سیرجان نیز مشاهده شد (Z>+1.96). | ||
| کلیدواژه‌ها | ||
| تخریب اراضی؛ فراوانی گردوغبار؛ فرسایش بادی؛ من-کندال؛ مناطق خشک | ||
| عنوان مقاله [English] | ||
| Analysis of internal and external dust contributions and their spatial-temporal changes in Kerman province | ||
| نویسندگان [English] | ||
| Abolfazl Ranjbar1؛ Zohre Ebrahimi-Khusfi2 | ||
| 1Professor, Department of Desert Management and its control, Faculty of Natural Resources and Geo-science, University of Kashan, Iran | ||
| 2Associate professor in De-desertification, Department of Environmental Science and Engineering, Faculty of Natural Resources, University of Jiroft, Jiroft, Iran | ||
| چکیده [English] | ||
| Dust particles originating from internal and external sources have adverse effects on public health and the environment. Considering the unknown contribution of the mentioned resources to dust production, it is very important to investigate this issue in different regions of Iran. In addition, the analysis of spatial and temporal changes of events with different origins can be an effective step toward identifying areas more sensitive to the phenomenon of wind erosion and reducing the risks caused by its occurrence in the affected areas. The present study was conducted considering the mentioned topics as the main objectives. For this purpose, internal (codes 07-09, 98 and 30-35) and external (code 06) dust phenomenon statistics recorded in 11 synoptic stations of Kerman province in the common time frame of 2002-2020 were used. After calculating the frequency of events, the contribution of internal and external dust sources in different regions of Kerman province was determined. Using the classified map of the dust events occurrence frequency and Mann-Kendall test were respectively analyzed their spatial and temporal changes. The results showed that in the three cities of Jiroft, Anar, and Sirjan, the contribution of external events was higher than other regions of the province, about 80%, 53.8%, and 53.2%, respectively. The contribution of internal events in Shahrbabak, Rafsanjan, Shahdad, and Baft was more than 73% and in Zarand, Kerman, Bam and Kohnuj more than 52%. On average, the share of internal and external events in Kerman province was estimated to be 60.6% and 39.4%, respectively. The spatial distribution pattern of internal and external dusts showed that Bam and Jiroft were the most sensitive areas to wind erosion in the study period. In the study period, the events originating inside and outside the station in Shahdad and Zarand had a significantly increasing trend. A significant increasing trend of events with internal origin was observed in Kohnouj, Rafsanjan and Anar, and an increasing trend of dust originating outside the station was also observed in Sirjan (Z>+1.96). | ||
| کلیدواژه‌ها [English] | ||
| Land Degradation, Dust Events Frequency, Wind Erosion, Mann-Kendall, Arid Regions | ||
| مراجع | ||
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