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71.
72.
Jean-Christophe Comte Rachel Cassidy Janka Nitsche Ulrich Ofterdinger Katarina Pilatova Raymond Flynn 《Hydrogeology Journal》2012,20(8):1569-1588
Groundwater flow in hard-rock aquifers is strongly controlled by the characteristics and distribution of structural heterogeneity. A methodology for catchment-scale characterisation is presented, based on the integration of complementary, multi-scale hydrogeological, geophysical and geological approaches. This was applied to three contrasting catchments underlain by metamorphic rocks in the northern parts of Ireland (Republic of Ireland and Northern Ireland, UK). Cross-validated surface and borehole geophysical investigations confirm the discontinuous overburden, lithological compartmentalisation of the bedrock and important spatial variations of the weathered bedrock profiles at macro-scale. Fracture analysis suggests that the recent (Alpine) tectonic fabric exerts strong control on the internal aquifer structure at meso-scale, which is likely to impact on the anisotropy of aquifer properties. The combination of the interpretation of depth-specific hydraulic-test data with the structural information provided by geophysical tests allows characterisation of the hydrodynamic properties of the identified aquifer units. Regionally, the distribution of hydraulic conductivities can be described by inverse power laws specific to the aquifer litho-type. Observed groundwater flow directions reflect this multi-scale structure. The proposed integrated approach applies widely available investigative tools to identify key dominant structures controlling groundwater flow, characterising the aquifer type for each catchment and resolving the spatial distribution of relevant aquifer units and associated hydrodynamic parameters. 相似文献
73.
Ethnic groups’ response to the 26 December 2004 earthquake and tsunami in Aceh, Indonesia 总被引:4,自引:4,他引:0
Jean-Christophe Gaillard Elsa Clavé Océane Vibert Azhari Dedi Jean-Charles Denain Yusuf Efendi Delphine Grancher Catherine C. Liamzon Desy Rosnita Sari Ryo Setiawan 《Natural Hazards》2008,47(1):17-38
The 26 December 2004 earthquake and tsunami unfairly hit the different ethnic groups of Aceh, Indonesia. About 170,000 Acehnese
and Minangkabau people died in the Northern tip of Sumatra while only 44 Simeulue people passed away in the neighbouring Simeulue
island located near the earthquake epicentre. Such a difference in the death toll does not lie in the nature of the hazard
but in different human behaviours and ethnic contexts. The present study draws on a contextual framework of analysis where
people’s behaviour in the face of natural hazards is deeply influenced by the cultural, social, economic and political context.
Questionnaire-based surveys among affected communities, key informant interviews and literature reviews show that the people
of Simeulue detected the tsunami very early and then escaped to the mountains. On the other hand, Acehnese and Minangkabau
people, respectively in the cities of Banda Aceh and Meulaboh, did not anticipate the phenomenon and were thus caught by the
waves. The different behaviours of the victims have been commanded by the existence or the absence of a disaster subculture
among affected communities as well as by their capacity to protect themselves in facing the tsunami. People’s behaviours and
the capacity to protect oneself can be further tracked down to a deep tangle of intricate factors which include the armed
conflict that has been affecting the province since the 1970s, the historical and cultural heritage and the national political
economy system. This paper finally argues that the uneven impact of the 26 December 2004 earthquake and tsunami in Aceh lies
in the different daily life conditions of the ethnic groups struck by the disaster. 相似文献
74.
Jean-Yves Collot Jean Delteil Keith B. Lewis Bryan Davy Geoffroy Lamarche Jean-Christophe Audru Phil Barnes Franck Chanier Eric Chaumillon Serge Lallemand Bernard Mercier de Lepinay Alan Orpin Bernard Pelletier Marc Sosson Bertrand Toussaint Chris Uruski 《Marine Geophysical Researches》1996,18(2-4):357-381
The southern Kermadec-Hikurangi convergent margin, east of New Zealand, accommodates the oblique subduction of the oceanic Hikurangi Plateau at rates of 4–5 cm/yr. Swath bathymetry and sidescan data, together with seismic reflection and geopotential data obtained during the GEODYNZ-SUD cruise, showed major changes in tectonic style along the margin. The changes reflect the size and abundance of seamounts on the subducting plateau, the presence and thickness of trench-fill turbidites, and the change to increasing obliquity and intracontinental transpression towards the south. In this paper, we provide evidence that faulting with a significant strike-slip component is widespread along the entire 1000 km margin. Subduction of the northeastern scrap of the Hikurangi Plateau is marked by an offset in the Kermadec Trench and adjacent margin, and by a major NW-trending tear fault in the scarp. To the south, the southern Kermadec Trench is devoid of turbidite fill and the adjacent margin is characterized by an up to 1200 m high scarp that locally separates apparent clockwise rotated blocks on the upper slope from strike-slip faults and mass wasting on the lower slope. The northern Hikurangi Trough has at least 1 km of trench-fill but its adjacent margin is characterized by tectonic erosion. The toe of the margin is indented by 10–25 km for more than 200 km, and this is inferred to be the result of repeated impacts of the large seamounts that are abundant on the northern Hikurangi Plateau. The two most recent impacts have left major indentations in the margin. The central Hikurangi margin is characterized by development of a wide accretionary wedge on the lower slope, and by transpression of presubduction passive margin sediments on the upper slope. Shortening across the wedge together with a component of strike-slip motion on the upper slope supports an interpretation of some strain partitioning. The southern Hikurangi margin is a narrow, mainly compressive belt along a very oblique, apparently locked subduction zone. 相似文献
75.
Isabelle Brenon Olivier Audouin Nicolas Pouvreau Jean-Christophe Maurin 《Journal of African Earth Sciences》2009,55(1-2):47
A one-dimensional vertical model has been developed to simulate the water mass circulation along the vertical structure in all deep coastal areas. The model has hydrodynamic and transport components solved using finite difference scheme. The one-dimensional vertical model results are coupled to the vertically averaged two-dimensional model results at each point of a horizontal grid. A theoretical salinity profile is introduced for each vertically integrated value obtained from the 2DH model results. A viscosity profile, simulating a viscosity value close to zero at the surface and with large viscosity gradients, is applied along the water column. The model is applied to the Vridi channel, connecting the Ebrié lagoon to the sea (Ivory Coast).The response of the Ebrié lagoon is studied in terms of inflow and outflow of water in the system through the Vridi channel. Due to the abrupt variation of the surface slope, vertical velocities along the water column show an anticlockwise spiral from bottom to surface during a tidal cycle. Due to the bottom friction and to the vertical viscosity profile, velocities decrease from surface to bottom. However, the freshwater inflow slows down the tidal propagation during the flood and causes the surface velocity to be smaller than the bottom velocity at mid-tide. Close to the bottom, velocities follow an anticlockwise movement due to the tidal propagation. At the water surface, velocities follow only an alternative movement of either ebb or flood, along the channel direction. No cross shore velocities can develop at the surface in the channel. 相似文献
76.