تحلیل و پهنه بندی شدت تخریب بیابان‌زایی با استفاده از مدل بیابان‌زایی IMDPA و خوشه‌بندی (مطالعۀ موردی: دشت بم‌نرماشیر و رحمت آباد)

نوع مقاله: پژوهشی

نویسندگان

1 دانشجوی دکترای مدیریت و برنامه‌ریزی منابع آب، گروه آبیاری و آبادانی، دانشگاه تهران

2 استاد گروه علوم و مهندسی آب دانشگاه تبریز

3 استاد‏یار گروه علوم و مهندسی آب دانشگاه تبریز

چکیده

اقدامات اجرایی در زمینۀ کنترل بیابان‏زایی باید بر شناخت وضعیت فعلی بیابانی‌شدن و شدت آن متکی باشد. با توجه به این موضوع، در تحقیق حاضر بررسی تخریب بیابان‏زایی آبخوان واقع در دشت‏های بم‏نرماشیر و رحمت‏آباد (استان کرمان) با استفاده از مدل IMDPA و سامانۀ اطلاعات جغرافیایی انجام شد. در این پژوهش با استفاده از شاخص‏های کمی (افت سطح آب زیرزمینی)، کیفی )هدایت الکتریکی (EC)، کلر (Cl) و نسبت جذب سدیم ((SAR) و میزان فرسایش خاک محدودۀ آبخوان، به بررسی کلاس خطر بیابان‏زایی پرداخته شد. هر شاخص کلاس‏بندی شده و نقشۀ تخریب آن ترسیم شد. در نهایت، نقشۀ تخریب کلی منطقه با درنظرگرفتن بیشترین محدودیت در شاخص‏های کیفی به‌دست آمد. برای صحت‌سنجی مدل از روش‏های خوشه‌بندی وارد و K-means استفاده شد. در نهایت، نتایج به‌دست‌آمده از این تحقیق نشان داد از نظر تخریب بیابان‏زایی حدود 81/90 درصد و 61/8 درصد آبخوان به‌ترتیب در وضعیت خطر شدید و بسیارشدید قرار دارد که 5/62 درصد از نتایج مدل IMDPA توسط روش‏های خوشه‏بندی معنا‏دار گزارش شد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation and zoning the desertification destructive effects using IMPDA model and clustering (case study: Normashir and Rahmatabad plain)

نویسندگان [English]

  • Saman Maroufpoor 1
  • Ahmad Fakheri Fard 2
  • Jalal Shiri 3
چکیده [English]

Practical activities in controlling desertification must be based on current desertification situation and its severity. Based on this theory, in this study, the destructive ability of desertification was analyzed for the Bam Normashir and Rahmatabad (Kerman Province) plain aquifer using the IMDPA model and geographical information system (GIS). In this study, using the quantitative (water table depth) and qualitative (Electrical conductivity (EC), Cl and SAR) indicators as well as the soil erosion magnitudes in the studied locations, severity classes of degradation were evaluated. Then, the destruction map of the studied region was prepared by taking into consideration the maximum limitation in qualitative indices. Cluster analysis Ward and K-means method were utilized for testing the models. The results indicated that the desertification destructive in 90.81% and 8.61% of the aquifer is at severe hazard and very severe hazard class, respectively. Overall, 62% of the model results (IMDPA) was reported significant with clustering.

کلیدواژه‌ها [English]

  • Bam Normashir and Rahmatabad
  • Clustering
  • Ground waters
  • IMDPA
  • quantitative degradation hazard
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