Spatial Analysis of Environmental Hazards

Spatial Analysis of Environmental Hazards

Measuring the Vulnerability of Informal Settlements during the Earthquake with the use of GIS. Case Study: The Zire Nahre Torab Neighborhood, City of Parsabad

Authors
Alireza Mohammadi
Bahman Javid Moghvan
10.18869/acadpub.jsaeh.3.3.41
Abstract
Most of the large cities in developing countries have faced with the problem of informal settlements. The formation and growth of these settlements for reasons such as rapid and outside the customs building construction are the threatening issue for their communities. Informal settlements are areas that often shaped and expanded in major and middle cities of the Iran’s cities including the city of Parsabad. During the last decades, the rapid growth of urbanization and the lack of appropriate planning for low-income families housing leads to the formation of the urban informal settlements in most cities of the Iran. In most cases, these settlements have a structural and demographic dense texture. The structural texture of these settlements is often fine aggregate, impermeable, and unstable. In times of crisis, the possibilities of human and material losses to them are high.

Environmental hazards such as earthquakes are a serious threat to these settlements. However, these hazards in most developing countries, due to the unavailability and lack of preventive actions, end to the crisis. We cannot prevent earthquakes. But we can reduce the losses and damages caused by the earthquakes. Remove of the disaster is impossible, but it is possible to reduce the damage caused by the disaster. One of the most important ways to reduce the risk of earthquakes is preparation to deal with earthquakes. Preparation means having previous programs and plans.

Iran is one of the countries where earthquakes always happen. Because Iran located in the world's earthquake belt, each year on average about 1,000 earthquakes happening in Iran. Ardebil and Pars-Abad city, located in an area that the possibility of earthquakes shakings in these areas, is more. The Zire Nahre Torab Neighborhood is one of the Parsabad city’s informal settlements that located in the northwest of the city. Regarding the possibility of an earthquake in the city of Pars Abad, identification and assessment the vulnerability of the neighborhood during an earthquake, is essential. Therefore, identifying and assessing the vulnerability, especially in the poor neighborhoods to offer strategies for dealing with the injuries, is essential. The aim of this study is assessing vulnerability of the informal settlements during an earthquake by using spatial data and GIS. This study, have been prepared in fifth main parts including: introduction and background, methodology and presentation of case study, theoretical framework, analysis and conclusions.

This research in terms of the nature is practical and is descriptive and in terms of the method is analytical. Three methods including library, documentary and survey have been used for data collection. In the first phase, data and base maps were extracted from documents and reports of projects such as city comprehensive and detailed plans. Also, in this phase of the study data were updated. In the second phase, the problem, questions and research objectives were defined. In the third phase, the 3 criteria and 12 sub-criteria based on research literature and according to available data were selected. In the fourth phase, after preparation of databases related to each of the criteria in GIS, input layers were prepared for each of them. In the fifth step, the method of network analysis process (ANP) was used to determine the significance of criteria. In the sixth phase, the weighted overlay index (WOI) was used for combining output layers.



The results of this study show that more than 80% of neighborhood buildings are vulnerable against the risk of a possible earthquake. Also, research findings suggest that physical characteristics such as building structure, quality and age of the buildings will have the greatest role in determining the neighborhood buildings vulnerability level. Doing activities such as resisting buildings, improving roads, locating facilities in appropriate places, training and informing citizens to prevent a crisis caused by the possible earthquakes, is essential. Other recommendations are listed in below:


Identifying vulnerable buildings
The use of GIS in the management of settlements
Preparations cities, to deal with urban hazards
Empowering citizens to deal with environmental hazards
Action to reduce earthquake risk
Civil engineering Renovation of buildings
New practices in the urban construction
Equip cities with facilities and relief supplies.
The use of specialists in urban planning.
Conducting workshops on urban resilience.
Keywords
Vulnerability
Earthquake
crisis management
Informal Settlements
Zire Nahre Torab Neighborhood
Pars-Abad City
GIS
Alexander, D. 1993. Natural Disaster. London.
Boumer, F., V. Marck, E. 2001. Seismic Vulnerability Of Kuwait And Other Arabian Gulf Countries: Information Base and Research Needs ", Soil Dynamics And Earthquake Engineering, 21:181-186.
California Seismic Safety Commission “Cssc”.1999. Earthquake Risk Management: Mitigation Success Stories. Www.Seismic.Ca.Gov.
ESRI .2015.Arc GIS 10.3 Desktop Help. Understanding Overlay Analysis. Accessed On 2015-05-29.
Federovich, B. 1965. Physical Geology. Mir Publication, Moscow.
Hiraskar, G.K. 1980. Fundamental Of Town Planning, Delhi. Naisarak.
Howard, Kunreuther. 2012. A Framework For Risk Management Of Extreme Events: Evidence From Firms, Iaa Presidents' Forum, Los Angeles, Ca.
Kates, R.; Pijawka, D. 1977. From Rubble To Monument, the Pace Of Reconstruction Following Disaster, Ed. Eugene J.Hass.Roberts W.Kates And Marten.
Kirpes, M. Patricia. 1998. Mrtha patricia: Bring Environmental Justice To Natural Hazards.
Lechat, M.F. 1990. The International Decade For Natural Disaster Reduction: Background And Objectives, Disasters, 14: 1-6.
Lewis, J. 1981. Mitigation Preparedness Measures, In Disaster And The Small Dwelling, Ed. Lan Davis, Pergamon Press,Oxford. Michigan University.
Michael, W.; T, Guy J.P.; Nordenson, G.; D, Klau, J. 2008. .Earthquake Loss Estimation For The New York City Metropolitan Region Original Research Article., Soil Dynamics And Earthquake Engineering, Volume 28, Issues.
Moe, Tun L,; Patharkul, P. 2006. An Integrated Approach to Natural Disaster Prevention And Management.
Rashed, K.; Weeks, J. 2003. .Assessing Vulnerability to Earthquake Hazard Through Spatial, International Journal Of Geographic Information Science Multi criteria Analysis Of Urban Areas,17: 547-576.
Rohit, Jigyasu. 2005. Sustainable Post Disaster Reconstruction through Integrated Risk, Management-The Case of Rural Communities" South Asia.