scholarly journals Analysis of human exposure to landslides with a GIS multiscale approach

2022 ◽  
Author(s):  
S. Modugno ◽  
S. C. M. Johnson ◽  
P. Borrelli ◽  
E. Alam ◽  
N. Bezak ◽  
...  

AbstractDecision-making plays a key role in reducing landslide risk and preventing natural disasters. Land management, recovery of degraded lands, urban planning, and environmental protection in general are fundamental for mitigating landslide hazard and risk. Here, we present a GIS-based multi-scale approach to highlight where and when a country is affected by a high probability of landslide occurrence. In the first step, a landslide human exposure equation is developed considering the landslide susceptibility triggered by rain as hazard, and the population density as exposed factor. The output, from this overview analysis, is a global GIS layer expressing the number of potentially affected people by month, where the monthly rain is used to weight the landslide hazard. As following step, Logistic Regression (LR) analysis was implemented at a national and local level. The Receiver Operating Characteristic indicator is used to understand the goodness of a LR model. The LR models are defined by a dependent variable, presence–absence of landslide points, versus a set of independent environmental variables. The results demonstrate the relevance of a multi-scale approach, at national level the biophysical variables are able to detect landslide hotspot areas, while at sub-regional level geomorphological aspects, like land cover, topographic wetness, and local climatic condition have greater explanatory power.

2019 ◽  
Vol 44 ◽  
Author(s):  
Philip Sapiro

Population researchers have contributed to the debate on minority group distribution and disadvantage and social cohesion by providing objective analysis. A plethora of new distribution measurement techniques have been presented in recent years, but they have not provided sufficient explanatory power of underlying trajectories to inform ongoing political debate. Indeed, a focus on trying to summarise complex situations with readily understood measures may be misplaced. This paper takes an alternative approach and asks whether a more detailed analysis of individual and environmental characteristics is necessary if researchers are to continue to provide worthwhile input to policy development. Using England and Wales as a test bed, it looks at four small sub-populations (circa 250,000 at the turn of the century) – two based on ethnic grouping: Bangladeshi and Chinese; and two based on an under-researched area of cultural background, religion: Jews and Sikhs. Despite major differences in longevity of presence in the UK, age profile, socio-economic progress, and levels of inter-marriage, there are, at a national level, parallels in the distribution patterns and trajectories for three of the groups. However, heterogeneity between and within the groups mean that at a local level, these similarities are confounded. The paper concludes that complex interactions between natural change and migration, and between suburbanisation and a desire for group congregation, mean that explanations for the trajectory of distribution require examination of data at a detailed level, beyond the scope of index-based methods. Such analyses are necessary if researchers are to effectively contribute to future policy development.


Author(s):  
W. Y. Li ◽  
C. Liu ◽  
J. Gao

Nowadays, Landslide has been one of the most frequent and seriously widespread natural hazards all over the world. How landslides can be monitored and predicted is an urgent research topic of the international landslide research community. Particularly, there is a lack of high quality and updated landslide risk maps and guidelines that can be employed to better mitigate and prevent landslide disasters in many emerging regions, including China. This paper considers national and regional scale, and introduces the framework on combining the empirical and physical models for landslide evaluation. Firstly, landslide susceptibility in national scale is mapped based on empirical model, and indicates the hot-spot areas. Secondly, the physically based model can indicate the process of slope instability in the hot-spot areas. The result proves that the framework is a systematic method on landslide hazard monitoring and early warning.


2018 ◽  
Vol 4 (3) ◽  
pp. 265
Author(s):  
Emil Wahyudianto

Road corridor of Kota Batu – Kediri Regency Boundary is a provincial road that has a vital function for the economic and tourism movement from and to Batu City in East Java Province. This inter-regency road is historically vulnerable to disaster events such as landslide, Kali Konto flash flood, Kelud Mountain lahar, flood inundation, etc. This research was referred to Regulation of Ministry of Public Work No.22/PRT/M/2007 on Guidelines for Spatial Planning of Landslide Vulnerable Areas and helped with Geographic Information System (GIS). Method comparison was also conducted by Meiliana (2011) with the indicators from the same regulation, and by using Landslide Hazard Assessment (LHA) method that is based on historical data. The landslide risk mapping with LHA method that is combined with analysis result from the vulnerability of moving vehicles is suggested to be the reference in mapping the mass-movement disaster risk on Indonesian road corridors. Analysis on frequency of rainfall that triggered landslide concluded that the probability of landslide occurrence (PLO) on daily rainfall was 126.2 mm, or 3 days-cumulative rainfall of 192.26 mm.


Author(s):  
W. Y. Li ◽  
C. Liu ◽  
J. Gao

Nowadays, Landslide has been one of the most frequent and seriously widespread natural hazards all over the world. How landslides can be monitored and predicted is an urgent research topic of the international landslide research community. Particularly, there is a lack of high quality and updated landslide risk maps and guidelines that can be employed to better mitigate and prevent landslide disasters in many emerging regions, including China. This paper considers national and regional scale, and introduces the framework on combining the empirical and physical models for landslide evaluation. Firstly, landslide susceptibility in national scale is mapped based on empirical model, and indicates the hot-spot areas. Secondly, the physically based model can indicate the process of slope instability in the hot-spot areas. The result proves that the framework is a systematic method on landslide hazard monitoring and early warning.


2021 ◽  
Author(s):  
Luigi Lombardo ◽  
Hakan Tanyas ◽  
Raphaël Huser ◽  
Fausto Guzzetti ◽  
Daniela Castro Camilo

<p>The standard definition of landslide hazard requires the estimation of where, when (or how frequently) and how large a given landslide event may be. The geomorphological community involved in statistical models has addressed the component pertaining to how large a landslide event may be by introducing the concept of landslide-event magnitude scale. This scale, which depends on the planimetric area of the given population of landslides, in analogy to the earthquake magnitude, has been expressed with a single value per landslide event. As a result, the geographic or spatially-distributed estimation of how large a population of landslide may be when considered at the slope scale, has been disregarded in statistically-based landslide hazard studies. Conversely, the estimation of the landslide extent has been commonly part of physically-based applications, though their implementation is often limited to very small regions.</p><p> </p><p>In this work, we initially present a review of methods developed for landslide hazard assessment since its first conception decades ago. Subsequently, we introduce for the first time a statistically-based model able to estimate the planimetric area of landslides aggregated per slope units. More specifically, we implemented a Bayesian version of a Generalized Additive Model where the maximum landslide sizes per slope unit and the sum of all landslide sizes per slope unit are predicted via a Log-Gaussian model. These ''max'' and ''sum'' models capture the spatial distribution of landslide sizes. We tested these models on a global dataset expressing the distribution of co-seismic landslides due to 24 earthquakes across the globe. The two models we present are both evaluated on a suite of performance diagnostics that suggest our models suitably predict the aggregated landslide extent per slope unit. In addition to a complex procedure involving variable selection and a spatial uncertainty estimation, we built our model over slopes where landslides triggered in response to seismic shaking, and simulated the expected failing surface over slopes where the landslides did not occur in the past.  </p><p> </p><p>What we achieved is the first statistically-based model in the literature able to provide information about the extent of the failed surface across a given landscape. This information is vital in landslide hazard studies and should be combined with the estimation of landslide occurrence locations. This could ensure that governmental and territorial agencies have a complete probabilistic overview of how a population of landslides could behave in response to a specific trigger.</p><p>The predictive models we present are currently valid only for the 24 cases we tested. Statistically estimating landslide extents is still at its infancy stage. Many more applications should be successfully validated before considering such models in an operational way. For instance, the validity of our models should still be verified at the regional or catchment scale, as much as it needs to be tested for different landslide types and triggers. However, we envision that this new spatial predictive paradigm could be a breakthrough in the literature and, in time, could even become part of official landslide risk assessment protocols.</p>


2011 ◽  
Vol 48 (1) ◽  
pp. 128-145 ◽  
Author(s):  
Chuan Tang ◽  
Jing Zhu ◽  
Xin Qi

The Wenchuan earthquake (magnitude Ms = 8.0) of 12 May 2008 triggered widespread and large-scale landslides over an area of about 50 000 km2. A study was undertaken to determine the primary factors associated with seismic landslide occurrence. An index-based approach used to assess earthquake-triggered landslide hazard in the central part of the Wenchuan earthquake area affected is described. Slope gradient, relief amplitude, lithology, bedding–slope relations, fault proximity, stream proximity, and antecedent rainfall are recognized as factors that may have had an important influence on landslide occurrence. The assessment of the influence of each of these factors is presented through use of a series of maps showing areas of low, moderate, high, and very high landslide hazard. Areas identified as having “very high and high landslide hazard” were located along the earthquake-source fault and along both banks of the Jian River. The role of rainfall is very significant for future landslide occurrence in the earthquake area. The results of this study will assist decision makers in the selection of safe sites during the reconstruction process. The maps can also be used for landslide risk management in the study area.


Author(s):  
Ricard Zapata-Barrero ◽  
Fethi Mansouri

AbstractInterculturalism (IC) is presently discussed as a foundational basis for local public policy aimed at managing migration-related diversity within ethno-culturally plural societies, especially at the local level. Despite its increased saliency over the last decade, IC is neither theoretically new nor was it always intended for mere application in strictly city contexts of diversity. Rather, it has a global origin as a political basis for international relations and negotiations. In discussing these origins, this article has two main interrelated aims. Firstly, it provides an overview of the multi-scale approach of IC, with the purpose of disentangling analytically the different empirical bases where it can frame the diversity agenda. Secondly, it explores whether a lack of appreciation and awareness of this multi-scale orientation may affect IC’s capacity to address the challenges of diversity governance at the local level. Methodologically, the article will undertake a textual analysis of a select number of leading documents framing its practice within the broader policy literature produced by the four main institutions that have advocated the intercultural approach within a global agenda. These are the United Nations Educational, Scientific and Cultural Organization (UNESCO) and United Nations University, on one hand, and the European Union and the Council of Europe on the other. The main findings show us the importance of a multi-scale thinking in diversity and IC studies, to avoid contributing to greater confusion in its applications.


2021 ◽  
Vol 13 (12) ◽  
pp. 6698
Author(s):  
Seongwon Yoon ◽  
Sungsoo Kim

Despite the increasing uptake of the term sustainable business model (SBM), the concept has mainly focused on business strategies. However, integrating the SBM into a longer-term and macroscopic framework would make it more sustainable. This article explored the SBM as a national strategy that operates beyond a corporate level. In this respect, the study examined the ways in which cultural and political perceptions of a nation can influence consumers’ choices. This article particularly examined the explanatory power of two ideational driving forces: perceptions of cultural heritage, and perceptions of politics and foreign relations. By assessing a dataset of the views of 223 African students studying in Korea, this study confirmed that national image meaningfully affects consumer behavior (intention to recommend). Furthermore, the study provided new evidence that cultural and political perceptions of a nation have a significantly positive effect on national image. It was also found that national image played a role as a mediating variable relating to cultural/political perceptions and intention to recommend. By extending the concept of the SBM to a national level, this article lays the foundation for a win–win situation between decision makers in both business and political sectors.


2021 ◽  
pp. 1-24
Author(s):  
Conor O'Dwyer ◽  
Matthew Stenberg

Abstract Aspiring dominant-party regimes often institute major institutional and political reforms at the national level to ensure they retain control. However, subnational politics is an important, under-studied, component of regime consolidation. This study uses mayoral races in Hungary and Poland from 2006 to 2018 to examine two factors that may inhibit dominant-party regime consolidation in local politics: the use of two-round, i.e. runoff, electoral systems and strategic coordination among opposition parties. While we find little evidence that strategic coordination can lead to widespread opposition success in single-round systems, we do find that increasing the number of candidates decreases the likelihood of the nationally dominant party winning in the first round while not affecting the second round. As such, two-round mayoral elections may be an important buffer to dominant-party regime consolidation and may provide a training ground for the future opposition.


1983 ◽  
Vol 25 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Noah M. Meltz ◽  
Frank Reid

The Canadian Government has introduced a work-sharing program in which lay offs are avoided by reducing the work week and using unemployment insurance funds to pay workers short-time compensation. Compared to the lay-off alternative, there appear to be economic benefits to work-sharing for both management and employees. Reaction to the scheme has been generally positive at the union local level and the firm level, but it has been negative at the national level of both labour and management. These divergent views can be explained mainly as a result of short-run versus long-run perspectives. Managers at the firm level see the immediate benefit of improved labour relations and the avoidance of the costs of hiring and training replacements for laid-off workers who do not respond when recalled. The national business leaders are more concerned with work incentive and efficiency aspects of work-sharing.


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