Sediment volume variations inferred from DGPS measurements within Bossons glacier proglacial area (Mont-Blanc massif, France)

This dataset presents Differential Global Positioning System data (DGPS) acquired within the Bossons glacier proglacial area. Bossons glacier is a rapidly retreating glacier and its proglacial area is deglaciated for ~30 years. Bossons stream is one of the outlets of the subglacial drainage system. It starts as a 800 m steep cascade reach, then flows through an area with gentler slope : the Plan des Eaux (PdE). PdE is a 300 m long, 50 m wide proglacial alluvial plain with an increasing channel mobility in the downstream direction but decreasing slope gradient and incision. As it may act a sediment trap, studying periglacial and proglacial erosion processes in the Bossons catchment requires to quantify PdE sediment volume evolution. A several meter-sized block located within Bossons proglacial area was set up as GPS base : its location was measured by one antenna (Topcon Hyper Pro) by performing 600 consecutive measurements throughout one day. A second antenna (Topcon Hyper Pro) was then used to measure XYZ location of points in the proglacial area with a ~2 m grid. Radio communication between the two antennas allowed differential calculations to be automatically carried out on field using the Topcon FC-250 hand controller. This methodology yields 3 cm XY and 1.5 cm Z uncertainties. DGPS data have been acquired through 10 campaigns from 2004 to 2014; campaigns from 2004 to 2008 cover a smaller area than those from 2010 to 2014. Digital Elevation Model (DEM) have been interpolated from DGPS data and difference between two DEMs yields deposited and eroded volume within PdE. Maps of PdE volume variation between two campaigns show that incision mainly occurs in the upper and lower sections where as deposition dominates in the middle section. Deposition, denudation and net rate (deposition rate - denudation rate) are calculated by normalizing volumes by DEM areas. Deposition dominates results with a mean net rate of 29 mm/yr. However, strong inter-annual variability exists and some years are dominated by denudation : -36 mm/yr and -100 mm/yr for 2006 and 2011, respectively. Nonetheless, oldest campaigns (2004 to 2008) were carried out on the lower part part of the alluvial plain and ruling them out to keep only complete DEM (2010 to 2014) yields a mean net rate of ~15 mm/yr. This results is coherent with field observations of both strong deposition (e.g. flood deposits) and strong erosion (e.g. 30 cm incision) evidences. Bossons glacier proglacial area is thus dynamic with year-to-year geormorphological changes but may leans toward increasing its mean elevation through a deposition dominated system.

Bajo los adoquines está la Pachamama : Territorialidad andina en el Gran La Plata [2008-2011]

Desde hace aproximadamente 20 años, se está viviendo un resurgimiento del movimiento indígena a nivel mundial y continental. El territorio juega un papel esencial para las numerosas organizaciones y comunidades que lo componen, en tanto articula el accionar de estos sujetos al espacio en un sentido procesual y relacional, a través de una concepción en la que la tríada territorio-territorialidad-territorialización, niega la dualidad cartesiana entre materia y espíritu y afirma que toda apropiación material es a la vez simbólica. Según la Encuesta Complementaria de Pueblos Indígenas 2004-2005, complementaria del Censo Nacional de Población, Hogares y Viviendas 2001 del INdEC, el 54 de las 600.329 personas que se autoreconocen como parte de alguno de los más de treinta pueblos aborígenes que habitan en Argentina, se encuentra en áreas urbanas. El interés de este trabajo es el entender cuáles son las modalidades de apropiación material y simbólica del espacio que llevan adelante la Organización Quechua-Aymara Hijos del Cóndor [Kunthurpa Churinkuna] en conjunto con la Academia Mayor de la Lengua Quechua de Cusco-Filial Regional Internacional "Berisso" [Qheswasimi Jamutána Kuraq Suntur Qosqo-Perusuyu], y la Comunidad Qolla Gran La Plata, todas pertenecientes al universo cultural andino, y activas en el ámbito de la capital bonaerense. Es decir, qué territorialidad específica construyen en el espacio urbano, en función de la recreación de su cultura ancestral [analizada a través del enfoque del control cultural], y atendiendo a su relación con sus estrategias políticas y sus condiciones socioeconómicas, que se ponen en juego en la configuración de determinados espacios de socialización. Se trata de una investigación que emplea el método etnográfico, con técnicas tales como la observación participante y la entrevista en profundidad