Modelling of internal erosion based on mixture theory: General framework and a case study of soil suffusion

2019 ◽  
Vol 43 (15) ◽  
pp. 2407-2430 ◽  
Author(s):  
Tuan‐Anh Bui ◽  
Rachel Gelet ◽  
Didier Marot
Keyword(s):  
General Framework ◽  
Mixture Theory ◽  
Internal Erosion

scholarly journals Dam Breach Simulation with the Material Point Method

Computation ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 8
Author(s):  
Chendi Cao ◽  
Mitchell Neilsen
Keyword(s):  
Material Point Method ◽  
Mixture Theory ◽  
Material Point ◽  
Point Method ◽  
Internal Erosion ◽  
Dam Breach ◽  
New Model ◽  
Hencky Strain ◽  
The Impact ◽  
Soil And Water

Dam embankment breaches caused by overtopping or internal erosion can impact both life and property downstream. It is important to accurately predict the amount of erosion, peak discharge, and the resulting downstream flow. This paper presents a new model based on the material point method to simulate soil and water interaction and predict failure rate parameters. The model assumes that the dam consists of a homogeneous embankment constructed with cohesive soil, and water inflow is defined by a hydrograph using other readily available reach routing software. The model uses continuum mixture theory to describe each phase where each species individually obeys the conservation of mass and momentum. A two-grid material point method is used to discretize the governing equations. The Drucker–Prager plastic flow model, combined with a Hencky strain-based hyperelasticity model, is used to compute soil stress. Water is modeled as a weakly compressible fluid. Analysis of the model demonstrates the efficacy of our approach for existing examples of overtopping dam breach, dam failures, and collisions. Simulation results from our model are compared with a physical-based breach model, WinDAM C. The new model can capture water and soil interaction at a finer granularity than WinDAM C. The new model gradually removes the granular material during the breach process. The impact of material properties on the dam breach process is also analyzed.

Green Airport Investments to Mitigate Externalities

2017 ◽  
pp. 231-256 ◽  
Author(s):  
Maria Nadia Postorino ◽  
Luca Mantecchini ◽  
Filippo Paganelli
Keyword(s):  
General Framework ◽  
Green Economy ◽  
Transport Systems ◽  
Global Level ◽  
The Sustainable Development ◽  
Air Transport Industry ◽  
The Status ◽  
Land Consumption ◽  
Optimal Procedures

Transport systems are important pollution sources, mainly in terms of greenhouse gases, noise and land consumption. To mitigate the problem and safeguard airport development at the same time, the involved stakeholders are fixing goals, priorities and duties in order to promote the sustainable development of the air transport industry at global level and the wellness of local communities as well. It is desirable to estimate airport noise and carbon impacts in order to suitably manage them and identify strategies in line with the concept of green economy. In this chapter, a general framework to identify optimal procedures and methods to evaluate the effectiveness of policies addressed to reduce airport impacts on the airport surroundings is proposed. The case study of the airport of Bologna is presented as an example of Transport Company that effectively operates to minimize its noise and carbon impacts. According to the proposed general framework, impacts and estimated costs to achieve the status of green company have been computed.

Employees' Protection

2018 ◽  
pp. 1133-1152
Author(s):  
Chrysi Chrysochou ◽  
Ioannis Iglezakis
Keyword(s):  
Data Protection ◽  
General Framework ◽  
Case Law ◽  
Legal Framework ◽  
Smart Devices ◽  
Dominant Position ◽  
Digital Workplace ◽  
Surveillance Technology ◽  
Workplace Surveillance

This chapter describes the conflict between employers' legitimate rights and employees' right to privacy and data protection as a result of the shift in workplace surveillance from a non-digital to a technologically advanced one. Section 1 describes the transition from non-digital workplace surveillance to an Internet-centred one, where “smart” devices are in a dominant position. Section 2 focuses on the legal framework (supranational and national legislation and case law) of workplace surveillance. In section 3, one case study regarding wearable technology and the law is carried out to prove that national and European legislation are not adequate to deal with all issues and ambiguities arising from the use of novel surveillance technology at work. The chapter concludes by noting that the adoption of sector specific legislation for employees' protection is necessary, but it would be incomplete without a general framework adopting modern instruments of data protection.

‘But the Last Word Is Ours’: The Monopoly of Jurisdiction of the Court of Justice of the European Union in Light of the Investment Court System

2019 ◽  
Vol 30 (4) ◽  
pp. 1187-1220
Author(s):  
Francisco de Abreu Duarte
Keyword(s):  
European Union ◽  
General Framework ◽  
External Action ◽  
The Other ◽  
Court System ◽  
The European Union ◽  
Court Of Justice ◽  
The One ◽  
The Eu

Abstract This article develops the concept of the monopoly of jurisdiction of the Court of Justice of the European Union (CJEU) through the analysis of the case study of the Investment Court System (ICS). By providing a general framework over the criteria that have been developed by the Court, the work sheds light on the controversial principle of autonomy of the European Union (EU) and its implications to the EU’s external action. The work intends to be both pragmatic and analytical. On the one hand, the criteria are extracted as operative tools from the jurisprudence of the CJEU and then used in the context of the validity of the ICS. This provides the reader with some definitive standards that can then be applied to future cases whenever a question concerning autonomy arises. On the other hand, the article questions the reasons behind the idea of the monopoly of jurisdiction of the CJEU, advancing a concept of autonomy of the EU as a claim for power and critiquing the legitimacy and coherence of its foundations. Both dimensions will hopefully help to provide some clarity over the meaning of autonomy and the monopoly of jurisdiction, while, at the same time, promoting a larger discussion on its impact on the external action of the EU.

scholarly journals Construction Grammar and the corpus-based analysis of discourses

2019 ◽  
Vol 24 (3) ◽  
pp. 291-323
Author(s):  
Nicholas Groom
Keyword(s):  
Conceptual Model ◽  
General Framework ◽  
Construction Grammar ◽  
Linguistic Theory ◽  
Research Traditions ◽  
Detailed Case ◽  
Cognitive Linguistic ◽  
Academic Discourses ◽  
The Way

Abstract Construction grammar (CxG) initially arose as a usage-based alternative to nativist theoretical accounts of language, and remains to this day strongly associated with cognitive linguistic theory and research. In this paper, however, I argue that CxG can be seen as offering an equally viable general framework for socially-oriented linguists whose work focuses on the corpus-based analysis of discourses (CBADs). The paper begins with brief reviews of CxG and CBADs as distinctive research traditions, before going on to identify synergies (both potential and actual) between them. I then offer a more detailed case study example, focusing on a usage-based analysis of a newly identified construction, the WAY IN WHICH construction, as it occurs in corpora representing six different academic discourses. The paper concludes by rebutting some anticipated objections to the approach advocated here, and by proposing a new conceptual model for constructionist approaches to CBADs.

scholarly journals Internal erosion vulnerability of core soil due to drought: Case study of three zoned dams

2021 ◽  
Author(s):  
Ahmed Jalil ◽  
Ahmed Benamar ◽  
Mohamed Ebn Touhami
Keyword(s):  
Internal Erosion ◽  
Core Soil

scholarly journals Influence of Host Diversity on Development of Epidemics: An Evaluation and Elaboration of Mixture Theory

2005 ◽  
Vol 95 (4) ◽  
pp. 328-338 ◽  
Author(s):  
P. Skelsey ◽  
W. A. H. Rossing ◽  
G. J. T. Kessel ◽  
J. Powell ◽  
W. van der Werf
Keyword(s):  
Infection Rate ◽  
Mixture Theory ◽  
Equation Model ◽  
Gaussian Kernel ◽  
Host Genotype ◽  
Dynamic Simulations ◽  
Analytical Expression ◽  
Apparent Infection Rate ◽  
The Relationship

A spatiotemporal/integro-difference equation model was developed and utilized to study the progress of epidemics in spatially heterogeneous mixtures of susceptible and resistant host plants. The effects of different scales and patterns of host genotypes on the development of focal and general epidemics were investigated using potato late blight as a case study. Two different radial Laplace kernels and a two-dimensional Gaussian kernel were used for modeling the dispersal of spores. An analytical expression for the apparent infection rate, r, in general epidemics was tested by comparison with dynamic simulations. A genotype connectivity parameter, q, was introduced into the formula for r. This parameter quantifies the probability of pathogen inoculum produced on a certain host genotype unit reaching the same or another unit of the same genotype. The analytical expression for the apparent infection rate provided accurate predictions of realized r in the simulations of general epidemics. The relationship between r and the radial velocity of focus expansion, c, in focal epidemics, was linear in accordance with theory for homogeneous genotype mixtures. The findings suggest that genotype mixtures that are effective in reducing general epidemics of Phytophthora infestans will likewise curtail focal epidemics and vice versa.

scholarly journals Toward a Standard Approach for Echo Chamber Detection: Reddit Case Study

2021 ◽  
Vol 11 (12) ◽  
pp. 5390
Author(s):  
Virginia Morini ◽  
Laura Pollacci ◽  
Giulio Rossetti
Keyword(s):  
Online Social Networks ◽  
General Framework ◽  
Formal Definition ◽  
Digital Environment ◽  
Echo Chambers ◽  
Echo Chamber ◽  
Stability And Consistency ◽  
Meso Scale ◽  
Over Time

In a digital environment, the term echo chamber refers to an alarming phenomenon in which beliefs are amplified or reinforced by communication repetition inside a closed system and insulated from rebuttal. Up to date, a formal definition, as well as a platform-independent approach for its detection, is still lacking. This paper proposes a general framework to identify echo chambers on online social networks built on top of features they commonly share. Our approach is based on a four-step pipeline that involves (i) the identification of a controversial issue; (ii) the inference of users’ ideology on the controversy; (iii) the construction of users’ debate network; and (iv) the detection of homogeneous meso-scale communities. We further apply our framework in a detailed case study on Reddit, covering the first two and a half years of Donald Trump’s presidency. Our main purpose is to assess the existence of Pro-Trump and Anti-Trump echo chambers among three sociopolitical issues, as well as to analyze their stability and consistency over time. Even if users appear strongly polarized with respect to their ideology, most tend not to insulate themselves in echo chambers. However, the found polarized communities were proven to be definitely stable over time.

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