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Prevention of Disasters Related to Extreme Natural Ground Deformation Events by Applying Spatial Modeling in Urban Areas (Quito Ecuador)

机译:通过在城市地区(厄瓜多尔基多)应用空间模型来预防与极端自然地面变形事件有关的灾难

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摘要

Synthetic Aperture Radar Interferometry (InSAR) is a spatial technique based on obtaining the phase differences of two radar images, acquired by a satellite from separate orbits and at different times, to obtain a ground displacement image of a study area, This image is called interferogram. On the other hand, space syntax is a technique within architecture that is applied to quantify and describe the level of ease of population movement through any urban space in a city. It analyzes the flow, transit, displacement, accessibility and concentration of the population in areas of basic services, health, security, commerce and entertainment. What would happen if an earthquake greater than 6 or 7 Moment Magnitude-Mw occurs in these areas of intense concentration of the population that are in buildings constructed on intense deformations of the land? With respect to the seismic risk in the city of Quito, many studies related to seismic risks have been published, but there are no studies that relate the deformation of the land (INSAR) with the space syntax, so this article presents a new vision in the joint application of these tools, a useful vision for urban planners and designers, considering the occurrence of a major earthquake in areas of buildings that are located on intense land deformations and have high population concentrations. This study has been prepared in two phases: in the first phase, the built-up areas concentrated in the greatest terrain deformations by accumulated displacement obtained using the APS estimation & multitemporal analysis by PSI-InSAR time series analysis methodology and Sentinel 1A and 1B satellite images were categorized. In the second phase, through the space syntax’s theory and the use of DepthmapX, the movement patterns and traffic flows of the population were determined by means of graphs of spaces interconnected by streets (axial maps), to predict the spatial behavior of humans and its concentration in the mentioned sites. Finally, the results were integrated, determining the degree of exposure of the population found in built areas with high to very high displacement and an intense population concentration.
机译:合成孔径雷达干涉法(InSAR)是一种空间技术,其基于获取两个雷达图像的相位差,该图像由卫星从不同的轨道,在不同的时间获取,以获得研究区域的地面位移图像,该图像称为干涉图。 。另一方面,空间语法是一种体系结构内的技术,用于量化和描述人口在城市中任何城市空间中移动的难易程度。它分析了基本服务,卫生,安全,商业和娱乐领域的人口流动,过境,流离失所,可及性和集中度。如果在这些人口密集的地区,由于土地的强烈变形而建造的建筑物,发生大于6或7 Moment Mw的地震,会发生什么?关于基多市的地震风险,已经发表了许多与地震风险有关的研究,但没有将土地变形(INSAR)与空间语法相关联的研究,因此本文提出了一种新的见解。结合使用这些工具,对于城市规划人员和设计师来说是一个有用的构想,考虑到发生在严重土地变形和高人口密度的建筑物区域发生大地震的可能性。这项研究分两个阶段进行:在第一阶段中,使用APS估计和PSI-InSAR时间序列分析方法和多时相分析以及Sentinel 1A和1B卫星通过累积位移获得的累积位移集中在最大地形变形中的建筑区域图像已分类。在第二阶段,通过空间语法的理论和DepthmapX的使用,通过街道互连的空间图(轴向图)确定人口的移动方式和交通流,以预测人类及其行为的空间行为。集中在上述地点。最后,对结果进行综合,确定在高至非常高的流离失所和人口密集集中的建筑区域中发现的人口暴露程度。

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