Land Subsidence risk maps and InSAR based angular distortion structural vulnerability assessment: an example in Mexico City
TISOLS: the Tenth International Symposium On Land Subsidence – living with subsidence - Tenth International Symposium on Land Subsidence, Delft, the Netherlands, 17–21 May 2021(2020)
摘要
Abstract. Land subsidence is a phenomenon present in several cities
in central Mexico, and results from a combination of groundwater resources'
overexploitation and the local stratigraphic nature. Furthermore, subsidence
occurs inhomogeneously in space, producing differential vertical
displacements, which affect both the natural media, as well as human-built
structures. Subsidence associated structural-vulnerability assessments
usually rely on direct field measurements to determine parameters such as
angular distortion. However, the large areas in which land subsidence occurs
(city-scale) in Mexico City hinders a direct quantification of differential
displacements for all buildings and structures present in it. A Sentinel-1
based subsidence analysis shows that the highest velocities are located on
the eastern sector of the city. This velocity map was used as the basis for
a population density weighted land subsidence correlation analysis. Our Land
Subsidence Risk assessment indicates that 15.43 % of the population of
Mexico City live in intermediate, high and very-high risk zones which
corresponds to 1 358 873 inhabitants. Therefore, a significant percentage of
Mexico City's population is vulnerable to suffering damage in their housing
structures due to land subsidence. Furthermore, the lower income inhabitants
share a proportionally greater economic cost due to land subsidence and
associated shallow faulting. The structural vulnerability analysis of the
civil structures in the city was performed using angular distortion maps
derived from the subsidence velocity gradient between October 2014–October
2017 period. These maps indicate that within this time window,
∼12 % of the total urbanized area in Mexico City had
already exceeded a 0.002 radian angular distortion threshold; above which
damage in civil structures is more likely to occur. In fact, more than 1 million people have already suffered damages in their houses due to the
differential ground subsidence and the resulting structural angular
distortion. With these results, we can evaluate correspondence between
angular distortion map and critical infrastructure of the city, as a result,
we found that between 0 % and 12.84 % of these buildings have undergone
over 0.002 radian angular distortion.
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