Numerical simulation of a rare winter hailstorm event over Delhi, India on 17 January 2013
Summary: This study analyzes the cause of the rare occurrence of a winter hailstorm over New Delhi/NCR (National Capital Region), India. The absence of increased surface temperature or a low level of moisture incursion during winter cannot generate the deep convection required to sustain a hailstorm. Consequently, NCR shows very few cases of hailstorms in the months of December-January-February, making the winter hail formation a question of interest.
Numerical experiments of storm winds, surges, and waves on the southern coast of Korea during Typhoon Sanba: the role of revising wind force
Summary: We report the results on the effectiveness of an improved approach to surge and wave simulation by revising wind force. We tested the wind dissipation effects caused by land roughness with various land use types near the coast for wind field generation. As a result, better agreement between the simulated and measured storm winds have been found when considering wind dissipation effects. This modified wind force leads to clearly improved results for storm surge and wave simulation.
The connection between long-term and short-term risk management strategies for flood and landslide hazards: examples from land-use planning and emergency management in four European case studies
Summary: Adaptation to unforeseen, hazardous events requires the implementation of purposeful risk reduction strategies that aim at both taking effective measures and using funds most efficiently. Coordination of long-term and short-term risk management strategies is considered crucial. This research discusses current problems and indicates benefits to establishing or strengthening the link between spatial planning (long-term perspective) and emergency management authorities (short-term perspective).
K. Prenger-Berninghoff, V. J. Cortes, T. Sprague, Z. C. Aye, S. Greiving, W. Głowacki, and S. Sterlacchini Nat. Hazards Earth Syst. Sci., 14, 3261-3278, 2014 AbstractFull Article (PDF, 6591 KB)Discussion Paper (NHESSD)
05 Dec 2014
Moraine-dammed lake failures in Patagonia and assessment of outburst susceptibility in the Baker Basin
Summary: In Patagonia at least 16 moraine-dammed lakes have failed in historical time. Commonly failed lakes were in contact with glaciers at the time of failure and had moderate (≥ 8°) to steep (≥15°) outlet slopes. Seven failed lakes are located in the Baker Basin, Chilean Patagonia, were hydro-electric generation plants are planned. We assessed the outburst susceptibility of moraine-dammed lakes in the Baker Basin and identified 28 lakes with high or very high outburst susceptibility.
Analysis of extreme wave events on the southern coast of Brazil
Summary: This manuscript presents an investigation of extreme waves events in the southwestern Atlantic Ocean and the impacts on the coast of Rio Grande do Sul in Brazil. Six extreme waves events generated by extra-tropical cyclones are selected from 2000 to 2010, and their impact on the Rio Grande do Sul coast is studied.
Seismic and mechanical studies of the artificially triggered rockfall at Mount Néron (French Alps, December 2011)
Summary: Two mid-size rockfalls (~2,000 m3 each) occurred at the same place in 2011. While the first event was natural, the second one was artificially triggered and recorded by video cameras and seismic sensors. The measurements showed propagation velocities ranging from 12 to 30 m/s over the successive event phases. The most seismogenic phases were related to ground impact after free-fall and individual block impacts into a protective barrier. DEM reproduced the key features of the rockfall dynamics.
P. Bottelin, D. Jongmans, D. Daudon, A. Mathy, A. Helmstetter, V. Bonilla-Sierra, H. Cadet, D. Amitrano, V. Richefeu, L. Lorier, L. Baillet, P. Villard, and F. Donzé Nat. Hazards Earth Syst. Sci., 14, 3175-3193, 2014 AbstractFull Article (PDF, 10933 KB)Discussion Paper (NHESSD)
02 Dec 2014
Study of the seismicity temporal variation for the current seismic hazard evaluation in Val d'Agri, Italy
A wireless sensor network for monitoring volcano-seismic signals
Summary: We developed a WSN capable of collecting geophysical measurements on remote active volcanoes. Our main goals were to create a flexible, easy-to-deploy and easy-to-maintain, adaptable, low-cost WSN for temporary or permanent monitoring of seismic tremor. It enables the easy installation of a sensor array in an area of tens of thousands of sqm. It can be used to record data locally for later analysis or for continuously transmitting to a remote laboratory for real-time analysis.
A probabilistic tsunami hazard assessment for Indonesia
Summary: This study develops the first national probabilistic tsunami hazard assessment for Indonesia. The findings indicate that for short return periods (100 years) the south coast of Java and west coast of Sumatra have a similar hazard level to north Papua and north Sulawesi. For long return periods (2500 years) the hazard is the highest in Java and Sumatra. The results can be used to inform and prioritise tsunami risk reduction activities.
N. Horspool, I. Pranantyo, J. Griffin, H. Latief, D. H. Natawidjaja, W. Kongko, A. Cipta, B. Bustaman, S. D. Anugrah, and H. K. Thio Nat. Hazards Earth Syst. Sci., 14, 3105-3122, 2014 AbstractFull Article (PDF, 6539 KB)Discussion Paper (NHESSD)
28 Nov 2014
Epic landslide erosion from mountain roads in Yunnan, China – challenges for sustainable development
Evaluation of forest fire models on a large observation database
Summary: A set of 80 Mediterranean fire cases is used as an observation database for model evaluation. Simulations are carried out with 4 different front velocity models. The results are compared with several error scoring methods. All simulations are performed as automatic first guesses with no tuning, as an operational use. Regardless of the quality of the input data, it is found that the models can be ranked based on their performance and that the most complex models outperform the more empirical one.