بررسی شرایط محیطی و گردشی رخداد بارش سنگین و بادوام حوضه دز

تنوع منشا بارش در نقاط مختلف ایران به همراه شرایط عرض جغرافیایی، دوری و نزدیکی به منابع رطوبت وغیره سبب می‌گردد رفتارهای بارش مانند شدت و تداوم نیز دارای تغییرات زمانی و مکانی باشند. با استفاده از روشهای آماری و داده‌های دبی رودخانه دز سیل‌های سهمگین این رودخانه برای شناسایی عوامل موثر در ایجاد آنها استخراج گردید. اطلاعات تمام ترازهای جوی موثر با استفاده از نقشه‌های گویا و مناسب بصورت ترکیبی مورد تحلیل قرار گرفته و ویژگی‌های همدیدی و ترمودینامیکی بارش‌های ابر سنگین حوضه آبریز دز بررسی و الگوهای همدیدی منجر به طولانی شدن دوام سامانه‌ها بر روی حوضه آبریز و تاثیر آن بر دبی جریانات شناسایی و ارائه گردید. هدف تحقیق شناسایی الگو یا الگوهای سامانه‌های بارشی بادوام در حوضه رودخانه دز بوده است. نتایج بررسی نشان داد وجود یک فرود عمیق در شرق دریای مدیترانه باعث ریزش هوای سرد اروپا در غرب این ناوه و همچنین انتقال رطوبت از دریای عرب و خلیج فارس در شرق آن شده است و شرایط ایجاد یک صعود از مهمترین عناصر الگوی بارش سنگین و بادوام در حوضه می‌باشند. برنامه ریزی منابع آب، پیشگیری و اطلاع رسانی به موقع وکنترل و مهار سیلاب از نتایجی که می‌توان از این تحقیق انتظار داشت.

investigation of environmental and circulating conditions of heavy and persistent rainfall in dez basin

introduction the diversity of the source of precipitation in different parts of iran, along with the conditions of latitude, distance and proximity to moisture sources, etc., causes precipitation behaviors such as intensity and continuity to have temporal and spatial changes. using statistical methods and the discharge data of dez river, the violent floods of this river were extracted to identify the effective factors in their creation. the information of all the effective atmospheric levels has been analyzed in a combined manner using descriptive and appropriate maps, and synoptic andthermodynamic characteristics of heavy cloud precipitation in the catchment basin have been investigated and synoptic patterns leading to theprolongation of the systems in the catchment basin and its effect on the discharge of streams have been identified. and was presented. the aim of the research was to identify the pattern or patterns of sustainable rainfall systems in the dez river basin. the results of the investigation showed that the presence of a deep depression in the east of the mediterranean sea has caused the cold air of europe to fall in the west of this vessel, as well as the transfer of moisture from the arabian sea and the persian gulf to its east, and the conditions for creating an ascent of the most important elements of the pattern of heavy and durable precipitation in they are basins. planning of water resources, prevention and timely notification and control and containment of floods are among the results that can be expected from this research.due to the importance of rainfall for a dry country like iran, many researches have been conducted on the characteristics of rainfall in iran.however, there are still many unknowns about this rebellious and variable climate element. in iran, precipitation is one of the basic variables to evaluate the potential existence of water resources. although it has a periodic nature, its temporal and spatial distribution is very uneven andtherefore the distribution of water resources is not uniform. the maintenance and management of water resources is also a function of received rainfall and depends on its variability. therefore, the smaller the spatial changes of precipitation, the greater the homogeneity and homogeneity of water resources (massoudian, 2015). the diversity of the source of precipitation in different parts of iran, along with the conditions of latitude, distance and proximity to moisture sources, etc., causes rainfall behaviors such as intensity and continuity to have temporal and spatial changes.especially in the southern regions of iran, which have less rainfall, these changes are more severe. considering the importance of rainfall and its impact on various economic, agricultural, and social sectors and the need to investigate and identify the synergistic patterns of rainfall in the study area for use in planning and optimal management of water resources, the necessity of doing this is evident. ecosystems and physical structures of human societies are adjusted to normal climatic conditions, and when extreme climatic phenomena occur, they can rarely equip andprepare themselves. it has been identified and investigated continuously with a duration of more than 5 days in the period of 1979-2006 (ming, 2008, 331). (canvas et al., 2019) in the analysis of the relationship between the classification of atmospheric circulation patterns and daily precipitation in the pyrenees region in the north of barcelona, spain, concluded that during the statistical period of 1961-2010, the precipitationtrend during the period was significantly decreasing, which the decrease corresponds to the change in the type of atmospheric systems during the statistical period. during the rainy years, iceland's low pressure at sea level and deep mid-atmosphere troughs played an important role.