مديريت بحران در شهر جديد بهارستان با استفاده از سيستم اطلاعات جغرافيايي، با تكيه برسيل وتعيين مسير هاي زهكشي شهري مناسب براي دفع آبهاي سطحي

Crisis Management in Baharestan New Town (Relying on Flood and Determined the Appropriate Urban Drainage Routes for Disposal of Surface water

سيل يكي از پديده هاي موجود در طبيعت بوده كه از ديرباز، بشر شاهد وقوع آن مي باشد. در ايران نيز بدليل وسعت زياد، اقاليم متعدد و تراكم زماني و مكاني بارش ها در اكثر حوضه هاي آبخيز، همه ساله شاهد سيلابهاي عظيمي در اكثر مناطق كشور مي باشيم. شهر جديد بهارستان نيز از اين پديده طبيعي مستثني نبوده و در چند سال گذشته سيل هاي متعدد و مخربي در آن روي داده اند. در اين پژوهش با استفاده از آمار بارندگي 55 سال اخير در نزديك ترين ايستگاه به شهر بهارستان، بارش هاي سنگين آن استخراج شد، سپس وضعيت بارش و ميزان امكان وقوع سيل و نيز حجم رواناب ناشي از بارش در محدوده قانوني شهر، سطح كل حوضه، محل تمركز و جهت حركت جريان هرز آبهاي حاصل از بارش ها در ارتفاعات اطراف اين شهر با استفاده از سيستم اطلاعات جغرافيايي مشخص گرديد. بعد از آن جهت شيب تمامي خيابان هاي شهر در طي عمليات ميداني تعيين گرديد تا جهت حركت سيلابهاي احتمالي مشخص شود. در نهايت 5 دسته كانال با سطح مقطع هاي متفاوت براي جمع آوري و انتقال آبهاي سطحي شهر جهت امنيت شهر در برابر رواناب هاي زيرحوضه هاي شهري و غير شهري پيشنهاد گرديد.

Crisis Management in Baharestan New Town (Relying on Flood and Determined the Appropriate Urban Drainage Routes for Disposal of Surface water Zahrah Hejazizadeh: Professor, Faculty of Geography Tarbiat Moallem University Faramarz khosravi: Master of Urban and Regional Planning Mohammad Hossein Nasserzadeh: PhD, Faculty of Geography Tarbiat Moallem University Abstract Flood is the one of existing phenomenon’s in the nature that long run mankind is witness of its occurrence. Also in the Iran, because of large extent, multiple climates and density of time and place of precipitation in most watershed basin, we are witness of huge floods in most parts of the country every year. Also, new city of Baharestan not accepted from this natural phenomenon, numerous and destructive floods have occurred therein in the past few years. In this study, try that with rainfall data from recent 55 years of nearest station to the Baharestan city and necessary operations, be extracted heavy rainfalls of that, to be more tangible the rainfall condition and possibility of floods in this city, and as well as determine the volume of runoff from rainfall within the town statutory Confine and whole basin plane. Then determined the local focus and direction of runoff stream from rainfalls in heights around this city by using Geographical Information System (GIS). Afterwards during field operations, to be determined direction of possible floods, appointed the slop direction of all city streets. Finally, were proposed 5channel classes with different cross-section to collect and transfer the surface water of city, for city safety against urban and non-urban Sub-Basins? Keywords: Crisis Management, Baharestan New Town, Flood, Runoff, Drainage Canal.