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The contribution of historical hydrogeomorphology in areas lacking hydrographic information or reliable geomorphological studies represents an interesting complementary tool to delimit potentially floodable spaces. This work aims at determining floodable areas through the historical hydrogeomorphological approach. The unit of analysis taken is the San Bernardo stream basin which is located in the mountain range system of Ventania, Buenos Aires (Argentina). The methodology used is based on different methods and techniques (hydrographic, geomorphologic, biogeographic) which, by complementing one another, allow for the zoning of the flood plain. The flooding events occurring in this area are linked to torrential rainfall events. The consequences range from material damage, to loss of infrastructure and even fatalities, in some cases. [ABSTRACT FROM AUTHOR]

The urban growth of Bahía Blanca city has intervened the northern periurban area with the consequent modification of the natural landscape, in particular the drainage network. Geo-morphological maps are instruments that make possible a temporal analysis and facilitate the visualization of processes and forms of the surface. The GIS software facilitates the analysis of the changes produced in the natural environment due to urban development. The aim of this work is to study the mutual implications between the geo-morphological dynamics and the urbanization process in the northern periurban area of Bahía Blanca city. The identification of geoforms and processes was carried out on the basis of geological documents of the area, visual analysis of high resolution satellite images (2009 and 2015) and field control. A geographic database was implemented using Arc- GIS 10® that enables temporal analysis and the development of thematic cartography. Natural areas modified by urbanization and new periurban areas affected by hydro-geo-morphological dynamics were identified from a quantitative and qualitative cartographic analysis. [ABSTRACT FROM AUTHOR]

The study area corresponds to the basin of "El Belisario" stream, a small valley among mountains with a surface of 26 km², located in the Ventania System. The location determines the presence of social and physical elements which constitute a high environmental vulnerability facing different kinds of threats such as massive fires and avenue phenomena of a cyclic character and marked seasonal concentration. The aim of this work is to establish links between the occurrence of avenue processes and the variation of water availability in "El Belisario" basin. Newspaper articles were gathered, annual and interannual water balances were made and environmental characteristics, which favour the occurrence of these events, were analyzed. It should be mentioned that the frequency of these phenomena is low; however, its magnitude has highly harmful consequences for the population. Important economical losses are generated, owing to the negative impact on resources-risking human lives and facilities. That is why understanding the dynamics of occurrence of these phenomena is necessary for improved local development and management of resources as well as for the watering process. [ABSTRACT FROM AUTHOR]

Building risk spaces differ according to the history of the urban development and the environmental context of each city. The aim of this work is to analyze historical-territorial periods that generated the construction of flood risk areas in the city of San Carlos de Bariloche, Río Negro, Argentina. The Dagwood Sandwich methodology was applied to analyze the urbanization and its transformations over time and the role played by the environment and the impacts caused by society. Correlations were observed within six historical-territorial crosscutting moments at different scales (local, provincial, national and international) and the development of exposed spaces to different dangers. This methodology allows identifying and acknowledging the current and historical environmental situation, in order to forecast possible trends of urban expansion and the generation of new flood-risk territories. [ABSTRACT FROM AUTHOR]