Journal of Spatial Analysis Environmental Hazards
تحلیل فضایی مخاطرات محیطی
Journal of Spatial Analysis Environmental Hazards
Literature & Humanities
http://jsaeh.khu.ac.ir
1
admin
2423-7892
2588-5146
10.61186/jsaeh
fa
jalali
1396
4
1
gregorian
2017
7
1
4
2
online
1
fulltext
fa
تحلیل فضایی مخاطرات ژئومورفیک تهدید کننده مجتمع های زیستی شهری
در استان لرستان
Geomorphological hazards threatening the spatial analysis of urban living complex in Lorestan province
تخصصي
Special
پژوهشي
Research
<div style="text-align: justify;"><span style="font-size:16px;"><span style="font-family: nasimyw;"><strong>انسان از ابتدای حیات خود دائما با تهدید های ژئومورفیک مواجه بوده و این مخاطرات، خسارات جانی و مالی را در زیستگاههای انسانی و به ویژه در شهر ها برای جوامع انسانی به دنبال داشته است. امروزه شهرها در نقاط مختلف دنیا به دلایل متعدد در معرض آسیب ناشی از مخاطرات ژئومورفیک قرار دارند، که شهرهای استان لرستان واقع در رشته کوههای زاگرس نیز از این قضیه مستثنی نیستند. هدف از این تحقیق پهنه بندی و شناسایی پهنه های پرخطر ژئومورفیک در مناطق شهری استان لرستان با استفاده از روش توصیفی- تحلیل و تجربی می باشد. در روش توصیفی داده ها و اطلاعات مورد نیاز از منابع و سازمانهای مختلف تهیه شد. در روش تحلیلی عوامل موثر در پهنه بندی مخاطرات ژئومورفیک زلزله، سیل، زمین لغزش و روانگرایی و تلفیق آنها جهت تهیه نقشه مخاطرات ژئومورفیک با استفاده از تحلیل های مکانی </strong><span dir="LTR">GIS</span><strong> و مدل های </strong><span dir="LTR">AHP</span><strong> و منطق فازی انجام گرفت. ابتدا پارامترهای موثر در رخداد هر یک از مخاطرات شناسایی و پس از استانداردسازی پارامترها با استفاده از توابع کاهشی و افزایشی منطق فازی و وزن دهی به پارامترها با استفاده از تحلیل سلسله مراتبی، پهنه های پرخطر در شهرها شناسایی شد. نتایج نشان داد که اکثر شهرهای استان لرستان به دلیل عبور رودخانه های اصلی از محدوده شهرها، در معرض خطر سیلاب قرار دارند. هم چنین مشخص شد که شهرهای واقع در غرب استان در معرض خطر سیلاب و شهرهای شرق استان در معرض خطر زلزله و رخدادهای ژئومورفیک ناشی از زلزله مانند زمین لغزش و روانگرایی قرار دارند.</strong></span></span></div>
<div style="text-align: justify;"><span style="font-size:16px;"><span style="font-family: times new roman;">Natural hazards are basically the changes that occur in environmental conditions, causing a disruption of the natural life of the people and their exposure to hazardous and degradable elements and elements<span dir="RTL">.</span> Establishing cities and residential areas on landforms has created new perspectives. The development of these areas has altered the geostationary balance of many landforms, and the response of geosystems is an expression of geomorphological hazards such as land subsidence, fault activity, flood, and the like that threatens residents of urban areas. The trend of population growth in the urban areas of Lorestan province in western Iran has also caused the physical expansion of the provincial cities in the periphery. This development has resulted in landslides and areas that, in many cases, have not been studied in environmental and environmental sustainability. The consequence of this is to increase the risk factor of these areas against a variety of hazards. In this regard, the aim of this study is to analyze the geomorphic hazards of earthquake, flood, landslide and liquefaction in the 9 major cities of the province and zonation of areas based on the degree of risk, in order to identify the high risk areas, urban management, necessary measures to increase environmental capabilities. And reduce vulnerabilities<br>
In this research, effective factors were first identified in the occurrence of each of the flood geomorphic hazards, landslide, earthquake and fluidization. Then, maps were prepared for each of the factors, topographic maps, geology, geological data, seismicity, etc. from different organizations and maps were prepared. After preparing the maps, the fuzzy standardization method (decreasing and incremental functions) was used to determine the effective impact of each of the effective information layers in the occurrence of each of the hazards. In the final stage, considering the factors affecting the occurrence of any geomorphic hazards, weighing to layers based on their degree of importance was carried out using (AHP) method. At this stage, the final weight of each layer was multiplied in the corresponding layer, and then together and the final map of each of the geomorphic hazards was prepared. After mapping each of the geomorphic hazards of the studied cities, weighing and combining earthquake, flood, landslide and fluidization layers, maps of geomorphic maps of the cities were prepared.<br>
The study of the geomorphic hazards of the city of Poldokhtar in the south of the province suggests that flood occurrence is considered as the most important threat to the geomorphic city of Poldokhtar. There is also a possibility of liquefaction due to the high groundwater level, especially in the north of the city. In the city of Kohdasht, in the west of the province, the risk of flood events is higher than the other hazards due to the river passing as a drainage of the catchment from the city. Geomorphic hazards in the northern city of northern Lorestan indicate that the central part of the city is at risk of landslide and liquefaction and parts of the north, west and south are exposed to flood. The probability of occurrence of geomorphic hazards in the area of Alshatr in the north of Lorestan province is low. So that the northwest and eastern parts of the city are risk free and in other parts, the risk of geomorphic hazards is moderate and low. Surveying the risks of Boroujerd city indicates that parts of the West of the city that are in high risk of flood, landslide and liquefaction are known as high risk areas and southern regions as low risk areas. Also, among the threats of Borujerd city, the probability of an earthquake due to the crossing of the young Zagros fault from the Silakhor plain is more than the other geomorphic hazards. In the city of Azna, the risk of flooding is considered to be the most significant danger to the city, although there is a likelihood of landslide and fluidization. The study of geomorphic hazards in the city of Aligudarz shows that rivers in the west of the city are exposed to geomorphic hazards, especially flood. In the city of Dorood, the flood event seems more likely than other hazards. The flood event in the central part of the city, which crosses the main rivers, has the highest potential. But in general, the risk of an earthquake is the most important geopolitical risk in the city of Dorood. In the city of Khorramabad as the capital of Lorestan province, the southern parts of the city have the highest geomorphic risk due to the high potential of flood and liquefaction. Also, the flood risk is considered to be the most important geomorphic risk in the city.<br>
The study of geomorphic hazards in the major cities of Lorestan province suggests that there is a probability of occurrence of hazards in urban areas, but the types of hazards are different in cities located in the west and east of the province. Studies show that there is a potential for flood events in many cities, especially in southern cities and Khorramabad, in the capital of the province. Cities located in the east of the province (Doroud, Azna and Boroujerd) have a high density of earthquake occurrence due to the fact that they are located in the zone of the young Zagros fault and the Seychelles seismic quake. Nevertheless, according to geological formations, there is a possibility of landslide occurrence in the cities of Khorramabad and Aligudarz. The likelihood of occurrence of liquefaction occurrence in the studied cities is higher, especially in the eastern province of the province, because the urban areas are mainly located in plains with high groundwater and alluvial soils. The final results show that the risk of flood in the western regions of Lorestan province and the earthquake in the eastern provinces of the province are the most important threats to geomorphic cities.</span></span></div>
مخاطرات ژئومورفیک, زیستگاههای شهری, سیلاب, زلزله, استان لرستان.
Geomorphic hazards, Lorestan, urban bio-complexes.
107
125
http://jsaeh.khu.ac.ir/browse.php?a_code=A-10-87-2&slc_lang=fa&sid=1
hamed
abbasi
حامد
عباسی
abbasih55@gmail.com
10031947532846002144
10031947532846002144
Yes
siamak
sharafi
سیامک
شرفی
10031947532846002145
10031947532846002145
No
zohreh
maryakji
زهره
مریانجی
10031947532846002146
10031947532846002146
No