شناسايي مناطق مستعد وقوع غلظت هاي بالاي گردوغبار و بررسي همديدي آن در حوضه جازموريان

Identification of areas susceptible to high dust concentrations and their relationship with synoptic factors in Jazmourian basin

الگوي توزيع مكاني گردوغبار متغير مهمي در درك حمل و نقل گرد و غبار و اجراي استراتژي هاي كنترل مناسب است. مطالعه حاضر با استفاده از شبيه سازي با مدل nmmb / bscdust دربازه سه ساله (از سال 2014-2016) ، توزيع فضايي گرد و غبار در حوضه جازموريان را مورد بررسي قرار داده است. بدين منظور چند واقعه گردوغبار در منطقه براساس ميدان ديد و كدهاي گردوغبار انتخاب و مسير انتقال گردوغبار در آن بازه تا 72 ساعت رصد گرديد. در نهايت با روي هم گذاري تصاوير حاصل از مدل در اين بازه هاي انتخابي با استفاده از روش فازي در محيط arcgis نقشه مناطق مستعد وقوع غلظت بالاي گردوغبار در حوضه تهيه گرديد. براي هر تاريخ انتخابي ، از تصوير سنجنده smap براي اندازه گيري رطوبت خاك سطح زمين استفاده گرديد. و بادهاي منطقه اي با كمك مدل ncep/ncarمورد بررسي قرار گرفت. نتايج اين تحقيق نشان داد كه بخش مركزي حوضه جازموريان كه تالاب جازموريان در آن واقع شده است بيشترين غلظت گرد و غبار در دوره مورد مطالعه را دارا بوده است.

The main aim of this study is identification of areas susceptible to high dust concentrations, investigating a number of factors affecting its formation (including wetland drying and soil moisture) and their coherence with synoptic factors (including climate maps and regional wind). The spatial distribution pattern of dust is an important variable in understanding dust transport and implementing appropriate control strategies. The present study investigates the spatial distribution of dust in the Jazmourian Basin using a simulation with the NMMB / BSC-Dust model over a three-year period (from 2014 to 2016). For this purpose, several dust events in the Jazmurian basin were selected based on the visibility and dust codes, and the dust transfer route was monitored for up to 72 hours for this date. Finally, by overlaying the model images in these selective intervals, by using the fuzzy method in ArcGIS environment, the map of areas disposed to high dust concentration in the basin were prepared. For each selected date, the SMAP satellite image was used to measure soil moisture. an‎d zonal winds were investigated using the NCEP/NCAR model. The results of this study showed that the central part of the Jazmurian basin, which is the location of the Jazmurian wetland, had the highest dust concentration during the study period. In addition, a synoptic study of dust sustainable areas showed that in the dates of the dust occurrence, low-pressure and high wind speeds centers formed on the surface of the basin.