A Study on Dust Storms Using Wind Rose, Storm Rose and Sand Rose (Case Study: Tehran Province)

نویسندگان

  • A. Nazari Samani Faculty of Natural Resources, University of Tehran, Karaj, Iran
  • A. Shahbazi Ph.D student of Watershed Management
  • S. Dadfar Senior expert of Desert Management
چکیده مقاله:

Sand and dust storms are natural events that occur widely around the world, mostly in dry and bare lands. Over thepast decade a large part of Iran has been affected by this phenomenon, and Tehran has not been excluded from thisevent. Therefore, having knowledge of spatiotemporal frequency variations can aid us in future management andstorm trajectory assessment. In this study the synoptic anemometric data of Tehran-Mehrabad stations over the past47 years were used. Annual and monthly wind and storm roses were drawn to determine the predominant winddirection. The primary results indicated that the prevailing wind direction is western, but in summer, it is southsoutheastern.According to the threshold wind velocity (6.5 ms-1) about 12% of recorded data was categorized intothe storm condition.. Results also indicated that western, northwestern, and southwestern winds have the three highestrates of sand drift potential (Dpt), respectively. The temporal variability of dust storms showed that between 1951 and2005, the largest number of days characterized by dust and thunderstorms was observed in the spring and summer.The average number of dusty days in spring and summer was four d/m, and the fastest winds ranged from 40 to 49m/s-1. An assessment of dusty days over the past five decades revealed that the average number of dusty days hassignificantly increased from 10 days to 80 days. It seems that cyclonic circulations in the Monsoon Trough togetherwith regional winds in central Iran are responsible for the transmission of dust particles over central Iran. Results anddata from this study can be helpful in determining and predicting the critical dust storm period and in formingmanagement strategies in order to minimize aftermath impacts.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

a study on dust storms using wind rose, storm rose and sand rose (case study: tehran province)

sand and dust storms are natural events that occur widely around the world, mostly in dry and bare lands. over thepast decade a large part of iran has been affected by this phenomenon, and tehran has not been excluded from thisevent. therefore, having knowledge of spatiotemporal frequency variations can aid us in future management andstorm trajectory assessment. in this study the synoptic anemo...

متن کامل

Investigation of the Role of Different Land Uses in a Sand Storm by using Wind Rose and Storm Rose (Case Study: Kashan)

The purpose of this research is to analyze anemometer data to study the wind regime in Kashan and to investigate the role of different land uses in sand storms. Therefore, anemometer data obtained from synoptic station of Kashan were analyzed during a 40-year period (1966-2005) using different methods. Seasonal and annual wind roses and storm roses for different lands were created using WRPlot ...

متن کامل

A rose is a rose is a rose?

This young man presented initially and repeatedly over a period of twenty years with symptoms of irritability, depressed and withdrawn mood, impulsivity, out-of-control behavior, and suicidal ideation and behavior. These symptoms occurred with disabling intensity at ages 3 year, 6 1/2 years, and 8 1/2 years, when he had not yet been adequately diagnosed and treated with appropriate psychopharma...

متن کامل

Using Rose

The Abstract check box identifies a class that serves as a base class. An abstract class defines operations and states that will be inherited by subclasses. This field corresponds to the abstract class adornment displayed inside the class icon. To toggle the abstract adornment, select or clear the abstract check box in the Class Specification. When you click Abstract and you view the model in B...

متن کامل

A "rose is a rose is a rose is a rose," but exactly what is a gastric adenocarcinoma?

In the 14 July 1997, issue of Lancet, Schlemper et al. [1] reported a study in which four Japanese and four Western pathologists (from the United States, Canada, Germany, and Finland) compared their diagnoses of gastric biopsy and resection specimens having epithelial lesions ranging from reactive, through preneoplastic, to invasive carcinoma. These pathologists independently classified microsc...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


عنوان ژورنال

دوره 18  شماره 1

صفحات  9- 18

تاریخ انتشار 2013-01-01

با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023