دوره 9، شماره 17 - ( بهار و تابستان 1397 )
جلد 9 شماره 17 صفحات 305-295 |
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چکیده: (3330 مشاهده)
هدف از مطالعه حاضر تحلیل روند خصوصیات خشکسالیهای استان همدان میباشد. بدین منظور شاخص بارش استاندارد شده اصلاحی (SPImod) بر اساس دادههای بارش ماهانه 11 ایستگاه سینوپتیک و بارانسنجی استان همدان طی سال‌های 1363 تا 1392 محاسبه شد. خصوصیات خشکسالی، شامل شدت، مدت و زمان بین آغاز دو خشکسالی متوالی، بر اساس شاخصSPImod تعریف و استخراج گردیدند. سپس روند خصوصیات خشکسالیها با آزمون ناپارامتری من-کندال محاسبه گردید. شیب خط روند با روش ناپارامتری برآوردگر سن محاسبه شد. نتایج نشان داد که در اکثر ایستگاه ها مدت خشکسالی دارای روند نزولی غیر معنیدار بوده و شدت خشکسالی هم در بیش از نیمی از ایستگاهها دارای روند غیر معنیدار کاهشی بود. زمان بین آغاز دو خشکسالی متوالی بجز ایستگاه وراینه که دارای روند افزایشی معنی دار در سطح 1% بود، در سایر ایستگاهها کاهشی غیرمعنیدار بودند. روند بارش ماهانه در اکثر ایستگاهها دارای روند غیرمعنیدار افزایشی بوده بجز ایستگاه کیتو که دارای روند غیرمعنیدار کاهشی بود.
نوع مطالعه: پژوهشي |
موضوع مقاله:
بلايای طبيعی (سيل، خشکسالی و حرکت های توده ای)
دریافت: 1393/11/27 | ویرایش نهایی: 1397/7/4 | پذیرش: 1395/1/23 | انتشار: 1397/7/4
دریافت: 1393/11/27 | ویرایش نهایی: 1397/7/4 | پذیرش: 1395/1/23 | انتشار: 1397/7/4
فهرست منابع
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