ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Unknown

Fast Tsunami Simulations for a Real-Time Emergency Response Flow (2020)

Goubier, Thierry ; Rakowsky, Natalja ; Harig, Sven

In: EPIC32020 IEEE/ACM HPC for Urgent Decision Making (UrgentHPC), pp. 21-26

add to mindlist on the mindlist

Details

Publication Date: 2021-12-28

Description: In the context of response to disasters, fast and accurate simulations can be integrated into a real-time flow, allowing best situation estimates to be provided at required deadlines for warnings and decisions. In such a pilot centered on earthquakes, the TsunAWI tsunami simulation code has been adapted and improved to provide both fast results with a coarse mesh and more accurate results with a fine mesh. Improvements to the TsunAWI code have allowed simulation runs to reach runtimes compatible with the needs of a workflow with real-time deadlines. A significant component of TsunAWI is the underlying mesh traversal order; the use of heuristics from the gpu rendering community can reach comparable performance to the original space filing curve ordering, and validation against historical cases is underway for the fast simulation results.

Repository Name: EPIC Alfred Wegener Institut

Type: Article , isiRev , info:eu-repo/semantics/article

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OA)

S·F·X

Fulltext

2

Unknown

Earthquake and Tsunami Workflow Leveraging the Modern HPC/Cloud Environment in the LEXIS Project (2020)

Goubier, Thierry ; Ajmar, Andrea ; D’Amico, Carmine ; [et al.]

Springer, Cham

In: EPIC3Advances in Networked-Based Information Systems, Springer, Cham, 1036

add to mindlist on the mindlist

Details

Publication Date: 2021-12-28

Description: Accurate and rapid earthquake loss assessments and tsunami early warnings are critical in modern society to allow for appropriate and timely emergency response decisions. In the LEXIS project, we seek to enhance the workflow of rapid loss assessments and emergency decision support systems by leveraging an orchestrated heterogeneous environment combining high-performance computing resources and Cloud infrastructure. The workflow consists of three main applications: firstly, after an earthquake occurs, its shaking distribution (ShakeMap) is computed based on the OpenQuake code. Secondly, if a tsunami may have been triggered by the earthquake, tsunami simulations (first a fast and coarse and later a high-resolution and computationally intensive analysis) are performed based on the TsunAWI simulation code that allows for an early warning in potentially affected areas. Finally, based on the previous results, a loss assessment based on a dynamic exposure model using open data such as OpenStreetMap is performed. To consolidate the workflow and ensure respect of the time constraints, we are developing an extension of a time-constrained dataflow model of computation, layered above and below the workflow management tools of both the high-performance computing resources and the Cloud infrastructure. This model of computation is also used to express tasks in the workflow at the right granularity to benefit from the data management optimisation facilities of the LEXIS project. This paper describes the workflow, the associated computations and the model of computation within the LEXIS platform.

Repository Name: EPIC Alfred Wegener Institut

Type: Article , peerRev , info:eu-repo/semantics/article

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OA)

S·F·X

Fulltext

3

Unknown

Towards near-realtime computation of tsunami inundation as part of the LEXIS project (2020)

Rakowsky, Natalja ; Harig, Sven ; Androsov, Alexey ; [et al.]

In: EPIC3EGU General Assembly 2020, online, 2020-05-04-2020-05-08

add to mindlist on the mindlist

Details

Publication Date: 2021-12-28

Description: State of the art tsunami warning systems employ a combined approach of pre-computed scenarios and on the fly tsunami simulation in case of an event. The on the fly simulations are performed on rather coarse meshes (approx. 1km resolution), usually neglect e.g., the non-linear advection in the shallow water equations, and can deliver a reasonable estimate of the wave height at the coast within a few seconds of computation time. As in the early warning situation, the earthquake source is the major unknown, they can improve the hazard assessment compared to pre-computed scenarios based on idealized sources. On the other hand, it requires a resolution of approximately 10m on land and the non-linear shallow water equations augmented by terms like the bottom roughness to simulate the inundation in the quality needed to derive risk maps for civil protection measures. With the simulation code TsunAWI, which employs an unstructured triangular mesh to seamlessly change the spatial resolution from a few meters in an area of interest to a few kilometers in the deep ocean, such simulations can be performed with a regional focus in less than 20min computation time. Hence, with a coarsened resolution, a first estimate of the inundation could be provided within a few minutes, improving the near-realtime assessment of the hazard. We investigate which quality of inundation result can be achieved within a limited computation time, regarding computing platforms based on various generations of Intel Xeon from Broadwell to Cascade Lake. This investigation is part of the EU funded LEXIS project lead by It4Innovations, Ostrava, Czech Republic. The overall aim is to build an advanced engineering platform at the confluence of HPC, Cloud and Big Data. Of particular interest is the development of time constrained workflows over HPC and cloud resources, with a pilot combining tsunami simulations and earthquake damage assessment. Fast tsunami inundation estimates are a key element of that pilot.

Repository Name: EPIC Alfred Wegener Institut

Type: Conference , notRev

Format: application/pdf

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OA)

S·F·X

PDF

Fulltext

4

Unknown

Systematic comparison of different numerical approaches for tsunami simulations at the Chilean coast as part of the RIESGOS project (2020)

Harig, Sven ; Zamora, Natalia ; Gubier, Alejandro ; [et al.]

In: EPIC3EGU General Assembly 2020, online, 2020-05-04-2020-05-08

add to mindlist on the mindlist

Details

Publication Date: 2021-12-28

Description: There is a growing number of numerical models for tsunami propagation and inundation available, based on different spatial discretizations and numerical approaches. Since simulations carried out with such models are used to generate warning products in an early warning context, it is crucial to investigate differences emerging from the chosen algorithms for simulation and warning product determination. Uncertainties regarding the source determination within the first minutes after a tsunami generation might be of major concern for an appropriate warning at the coast, still, the sensitivity of warning products with respect to pre-computed simulation database contents or on-the-fly calculations are of crucial importance as well. In this study, we investigate the performance of three models (TsunAWI, HySEA, COMCOT) in the oceanic region offshore central and northern Chile with inundation studies in Valparaíso and Viña del Mar. The investigation forms part of the tsunami component in the RIESGOS project dealing more general with multi hazard assessments in the Andes region. The numerical implementation of the models include both a finite element approach with triangular meshes of variable resolution as well as finite difference implementations with nested grids for the coastal area. The tsunami sources are identical in all models and chosen from an ensemble of events used in an earlier probabilistic study of the region. Additionally, two historic events are considered as well to validate the models against the corresponding measurements. We compare results in virtual gauges as well as actual tide gauge locations at the Chilean coast. Inundation areas are determined with high resolution and employing the model specific wetting and drying implementations. We compare the model results and sensitivities with respect to spatial resolution and parameters like bottom friction and bathymetry representation in the varying mesh geometries.

Repository Name: EPIC Alfred Wegener Institut

Type: Conference , notRev

Format: application/pdf

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OA)

S·F·X

PDF

Fulltext

5

Unknown

Wert und Herrschaft : feministische Perspektiven auf die erzählte und nicht erzählte Geschichte der Wertbildung (2020)

Biesecker, Adelheid ; Winterfeld, Uta von

add to mindlist on the mindlist

Details

Publication Date: 2021-12-23

Description: Während Fragen der Wertbildung meist als ökonomische behandelt werden, wird in diesem Beitrag der Prozess der Wertbildung politisch und ökonomisch verstanden. Ein Prozess, der von Herrschaft geprägt und doppelseitig ist: Bewertung ist mit Entwertung ebenso verbunden wie die Eingrenzung der Einen mit der Ausgrenzung der Anderen. Diesen Mechanismus nennen wir "Externalisierung als Prinzip". Die politik- und wirtschaftswissenschaftliche Konstruktion des externalisierenden Prinzips und die Herrschaftsformen seiner auch gewaltsamen Durchsetzung werden ideen- und theoriegeschichtlich bearbeitet. Feministische Analysen der klassischen Vertragstheorien und der Politischen Ökonomie zeigen: Die bürgerliche Gesellschaft und ihre Ökonomie werden durch Trennungen geprägt. Das wertvolle Dazugehörige ist angewiesen auf das als wertlos Ausgegrenzte. Es wird deutlich, dass die Geschichte mit der klassischen politischen und ökonomischen Theorie nicht zu Ende ist, sondern dass bis heute herrschaftsförmige Be- und Entwertungen als Mittel zur Krisenbewältigung eingesetzt werden.

Keywords: ddc:300

Repository Name: Wuppertal Institut für Klima, Umwelt, Energie

Language: German

Type: article , doc-type:article

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OA)

S·F·X

PDF

Fulltext

6

Unknown

Global magnetic observatory data 1991 - 2015 (2020)

INTERMAGNET ; et al.

GFZ Data Services

add to mindlist on the mindlist

Details

Publication Date: 2021-12-23

Description: Definitive digital values of the Earth's magnetic field recorded from 1991 to 2015 at INTERMAGNET observatories around the world. Data includes minute, hourly and daily vector values, along with observatory baseline values for quality control. Annual means are also included. All data is included on the single downloadable archive file (gzipped tar format) available from this landing page. This is the 25th annual publication in the series. Some national data institutions may have related DOIs that describe subsets of the data. These DOIs are shown under "Related DOIs to be quoted". For more information on the data formats used in this publication and the technical standards used to create the data, please refer to the INTERMAGNET Technical Manual and the Technical note TN6 "INTERMAGNET Definitive One-second Data Standard".

Language: English

Type: info:eu-repo/semantics/workingPaper

Permalink