First International Conference on MOLDAVIAN RISKS – FROM ...

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<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania CYBERDYN: A STATE-OF-THE-ART SUPERCOMPUTER FOR GEODYNAMIC MODELING OF ACTIVELY SEISMIC ZONES M. Pomeran 1 , V.C. Manea 2, 1 , M. Manea 2, 1 , L. Besutiu 1 , L. Zlagnean 1 1 Solid Earth Dynamics Department, Institute of Geodynamics of the Romanian Academy, Romania 2 Computational Geodynamics Laboratory, Centro de Geociencias, Universidad Nacional Autonoma de Mexico, Mexico Corresponding author: Mihai Pomeran, mihai.pomeran@gmail.com Abstract: In recent years, modeling and computation have come to play an central key role in modern earth sciences, and one of the reasons is due to their dependence on fine spatial grids and small time steps for integration used for solving numerically systems of equations that express mathematically a physical process. Presently, the solid earth sciences started to move towards implementing high performance computational research facilities. Today’s scientists need access to new information technology capabilities, able to perform high-resolution complex computing simulations in a reasonable time frame. Sophisticated simulation tools allow us to study phenomena that can never be observed or replicated by standard laboratory experiments. Modeling complex natural processes in general, and numerical computation in particular, represents today an essential need of research, and all modern research centers benefit from a computing center of one form or another. Computational modeling represents a powerful tool in the field of Earth Sciences, in particular in modeling large-scale processes inside the solid Earth. In this study we introduce the newly implemented state-of-the-art CyberDyn parallel machine, a High Performance Computing Cluster (HPCC) with 1344 computing cores and high-speed network connectivity available at the Institute of Geodynamics of the Romanian Academy. This computational infrastructure targets large-scale high-resolution geodynamic simulations. We measured the performance of HPCC CyberDyn using the parallelized open source code CitcomS, which is widely used in the solid earth community (www.geodynamics.org). The benchmark tests are performed using a series of 4D geodynamic settings ranging from regional to full-spherical models. The benchmark results show that the HPCC CyberDyn offers the opportunity to perform fast geodynamic simulations modeling with parallelized codes that scale well on 100s or even 1000s of processors. In the same time the high-speed QDR Infiniband interconnect offers the possibility to exploit the full potential of large clusters, and represents a key component that positively influence both, scalability and performance on large HPC systems. Since presently we are moving towards high-resolution simulations for geodynamic predictions that require the same scale as observations (from several to thousands of kilometers), HPC facilities used in earth sciences should benefit from larger up-front investment in future systems that are based on high-speed interconnects. Key words: geodynamics, HPC, computational modeling, information technology. 106
<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania FLOODS - A REPETITIVE RISK ON TROTUS VALLEY Alexandru Gutas, Lavinia Fedor, Alexandra Balint, Lavinia Misaila ”Dimitrie Ghika” High School Comanesti, Romania Misaila Lavinia, misaila_lavinia@yahoo.com Abstract: Comanesti has experienced many floods, causing huge material damage and losses of life. The work main purpose is to outline the major factor risks enhancing Nature’s protest “against the global warming”: poor sewage within the towns, illegal deforestation of hills or mountains slopes, dirty river banks, lack of citizens ‘education and responsibility, slow communication between different authorities, absence of specialized equipment, and in some cases, political or economical interests which caused the floods along the Trotus river during the years 2003, 2004, 2005, 2008 and 2010. The town Comanesti and the surrounding area had been suffered major damages due to lack of care for reforesting the cut woods, laying up closed boards and chambers of the coal closed mines, summed up with the minimum investment for the improvement of the water course regulation and disregards for the environmental area. Romanian authorities, having in mind the floods of 2005 and 2006, try to prevent these disasters or to mitigate their effects, but up to now there has been a big gap between theory and practice, mainly because of the complexity of the actions to be taken, which require time and money. The brief description of the foods episodes and the human influence may reveal the aspects like as: after many years of neglecting the hydro technical works (not building new ones or letting the old ones to be damaged), heavy rains exceeded the defence capacity of these with disastrous consequences; the absence of clear laws and the means to enforce the existing ones has to led to massive deforestation within certain watersheds, thus enhancing the effects of the heavy rains. It is good that the causes were discovered, but it takes effort, time and money to control floods. With authority’s effort and enlarging citizens education for the environment such negative episodes can be avoided in future.The work includes recent measures taken by local administration to regularize the Trotus course and dam up its banks together with afforestation of the slopes. All the research work was done by high school students from “Dimitrie Ghika” High School who worked collaboratively with the insurance companies in the area to estimate the damages caused by the floods. 107
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