Analyzing and Monitoring the Meteorological Droughts in the Region of Sistan and Balouchestan
Author(s):
Abstract:
In this research, analyzing the meteorological drought is performed by using of five commonly used indices including: Rainfall Standard Index (ZI), Deviation from Mean Index (SDI), Percent of Normal Precipitation Index (PNPI), Rainfall Anomaly Index (RAI) and Precipitation Classification range (PC) on seasonal and yearly precipitation data in the four synoptic stations of Zahedan, Zabol, Chabahar and Iranshahr, using the same period starting from 1964 and ending to 2005. The result showed that SDI method performs more reliable estimation compared with PNPI, ZI, RAI methods in the annual and seasonal time scales. Based on SDI method, Sistan and Balouchestan Province has experienced frequent meteorological drought in both seasonal and annual time scales. In annual time scale, the frequency (percent) of intense and severe droughts was smaller than frequency of mild and medium droughts. In the seasonal time scale, on average, based on SDI method, most (42%) of severe and intense droughts occurred in summer, but in winter, the risk of severe and intense droughts was smaller (12%), We also used 3-year and 5-year moving averages method for evaluation of trends anddrought duration in the annually time scale in the mentioned sites. The results showed that the rainfall standard index (RAI) performs different results from other indices. Other results also indicate that the intensity and frequency of meteorological drought are increasing in this province.
Keywords:
Language:
Persian
Published:
Journal of Environmental Sciences and Technology, Volume:17 Issue: 1, 2015
Pages:
49 to 61
magiran.com/p1401909
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یکساله به مبلغ 1,390,000ريال میتوانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
- حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران میشود.
- پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانههای چاپی و دیجیتال را به کاربر نمیدهد.
In order to view content subscription is required
Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!