Synoptic and dynamic analysis of flood generating systems in Mazandaran
Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
In the present study is to identify patterns causing floods in the Mazandaran province to predict these patterns through before the flood could necessary precautionary measures to prevent the damage and take advantage of precipitation. In this reserch, two databases composed of two variables is necessary. a group of variables and atmospheric data including geopotential height at 500 hPa, zonal wind(uwnd), meridional wind(vwnd) and specific humidity(shum) in Synoptic four hours in the range 0 to 80 degrees north and 0 to 120 degrees east at a spatial resolution 2.5 × 2.5 degree from the database (NCEP / NCAR) have been harvested and other group of precipitation and discharge data in area, during the is 28 Aban to 2 Azar 1388. Then, taking advantage of environmental- circulation approach to mapping 500hpa circulation patterns, atmosphere thickness patterns of the levels1000-500 hPa, moisture flux convergence function and frontogenesis function in 500,925 and 1000 hPa levels on the occurrence of floods. The results of this research have shown that flood generating precipitation in the Mazandaran area are mainly caused by the eastern Mediterranean frontal lows. At the same time, thickness patterns have illustrated intense depressure zone that caused by meeting of cold air mass of the high latitude with humid and hot air mass of the southern Mediterranean. Analysis of the moisture flux convergence(MFC) patterns also have shown that flood generating precipitation are caused by moisture flux of water masses of the Caspian Sea and Black Sea to the Mazandaran area. Analysis of the frontogenesis function maps indicate that occurrence of flood generating precipitation in the study area is caused by the formation and occurrence of front in the Caspian sea and the Black sea in middle levels and east these two of water masses at lower levels of atmosphere (925 and 1000 hPa).
Language:
Persian
Published:
Journal of Watershed Engineering and Management, Volume:11 Issue: 1, 2019
Pages:
129 to 146
magiran.com/p1951224  
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 990,000ريال 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.
دسترسی سراسری کاربران دانشگاه پیام نور!
اعضای هیئت علمی و دانشجویان دانشگاه پیام نور در سراسر کشور، در صورت ثبت نام با ایمیل دانشگاهی، تا پایان فروردین ماه 1403 به مقالات سایت دسترسی خواهند داشت!
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 50 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!