1,722,091 research outputs found
Soil erosion and sediment transport under different land use/land cover scenarios
No full text1 página.-- Introducción completa en resumen.The papers in this special issue of Catena are a selection of those presented at the Sections 6 and 7 of the 6th International Conference on Geomorphology, held in Zaragoza (Spain) from September 6 to 11, 2005. This Conference joined almost 1000 geomorphologists, many of them working on “border” topics, and therefore contributing to the advance of Geomorphology as a key science to understand the complex evolution and dynamics of landforms, and the interactions between past and present climate changes, land use changes, lithology, geological structure and tectonics. The papers presented at the Conference gave an excellent overview about the contribution of Geomorphology in different fields such as, among others, natural hazards, soil erosion, sediment transport, mass movements, extreme events, Global Change and environmental stress, and their relationships with land management.
Sections 6 and 7 were devoted to Hillslope Processes and Soil erosion, respectively. Both sessions were among the most attended of the Conference in number of papers presented and participants, confirming an increasing interest in the study of land degradation, sediment transport and mass movements at different spatial and temporal scales. New experimental, field and laboratory methods, detailed field observations and measurements, and the use of models to explain and predict geomorphic processes were common to many of the papers. Particularly, as previous issues of Catena and other international journals demonstrated, Global Change is present in almost all of the papers dealing on soil erosion and hillslope processes. How would it be possible to explain the characteristics of infiltration, rill, interril and gully erosion, sediment transport and river morphology, or the triggering of different mass movements without any reference to climate and land use changes? Most geomorphic processes are governed by temperature oscillations, the magnitude-frequency of rainfalls and floods, or human activities such as deforestation and reforestation, soil cultivation on steep slopes, farmland abandonment, overgrazing, channelization, gravel mining and construction of dams. An increasing number of papers stressed the role of climate fluctuations and historical and present-day land management, and this is the best contribution the geomorphologists can do in order to not only understand the geomorphic processes, but especially to improve our unique and menaced world.
The selection of papers included in this issue of Catena is particularly related to land use/land cover changes. These papers focus on (i) soil erosion processes (desertification, consequences of forest fires, factors controlling soil erosion, evaluation of denudation rates); (ii) gully development (vulnerable areas for gully erosion and gullies under forest canopy); and (iii) catchment studies (sediment transport, sediment delivery, relationships between streamflow and sediment load or simulation of badland erosion at catchment scale). The editors of this special issue wish to acknowledge the efforts made by all authors and particularly the reviewers for their anonymous and invaluable work.Peer reviewe
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
