Vanesa Acín's scientific contributions

Publications (36)

Article
Full-text available
Se ha analizado la evolución y relación entre los usos del suelo, el cauce activo y las actuaciones realizadas en el último medio siglo en las cuencas de los ríos Oiartzun y Oria. Se constata una importante reducción de la superficie del cauce activo, con estrechamiento e incremento de la vegetación, coincidiendo en el tiempo con un aumento de la s...
Poster
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Complete 3D models of five alluvial reaches affected by the removal of Inturia dam (Leitzaran River) have been obtained through laser scanner techniques. Removal was accomplished in four phases, 3 m per year, and completed in January 2016. Data registration started before the removal started in 2013 and every year after. Therefore erosion and sedim...
Article
River dynamics, global change and human pressure in Ebro basin, channel and delta. The river Ebro and its tributaries has undergone very remarkable changes since 1950. They have suffered marked process of simplification and stabilization, both in the main river and in its main Pyrenean and Iberian tributaries. They show important changes in the cha...
Article
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Resumen Se trata de la fase inicial de un proyecto que busca la puesta en valor de los ríos en gravas, muy amenazados y en claro proceso de desaparición, siendo al mismo tiempo de alto valor patrimonial. Se presenta el censo y la propuesta preliminar de tipologías de los ríos de gravas en el Pirineo central aragonés. A partir de fotointerpretación...
Conference Paper
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The methodology and results of two dam removals in two different rivers is presented and compared. One removed all-at-once and the second one in a four-stage removal process. Methodology included topographical measurements of the channel, TLS measurements of river bed and bars and sediment grain size and transport. Morphological channel adjustments...
Conference Paper
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The application of hydrogeomorphology as a tool for river management and decision making on reference condition definition for river restoration is presented. Water Framework Directive (2000/60/CE) requires the identification of reference conditions and attainable target images, to achieve the good ecological status, taking into account the direct...
Article
RIVER DYNAMICS, GLOBAL CHANGE AND HUMAN PRESSURE IN EBRO BASIN, CHANNEL AND DELTA. The river Ebro and its tributaries has undergone very remarkable changes since 1950. They have suffered marked process of simplification and stabilization, both in the main river and in its main Pyrenean and Iberian tributaries. They show important changes in the cha...
Article
Dam removal has been demonstrated to be one of the most frequent and effective fluvial restoration actions but at most dam removals, especially of small dams, there has been little geomorphological monitoring. The results of the geomorphological monitoring implemented in two dams in the rivers Urumea and Leitzaran (northern Spain) are presented. Th...
Poster
Full-text available
The development and application of a methodology for the identification of the morphological reference condition and target image for river restoration is presented. The methodology started with the identification of the geomorphological homogeneous river reaches. Two reach-making processes were developed; one based on crossed variables by GIS tool...
Conference Paper
Full-text available
Resumen Se presenta la metodología diseñada para el seguimiento geomorfológico del derribo de las presas de Mendaraz (río Urumea) e Inturia (río Leitzaran) en Gipuzkoa, así como los resultados obtenidos. Se han realizado secciones transversales, perfiles longitudinales, abundantes mediciones de procesos sobre testigos, mediciones con escáner láser...
Article
Full-text available
A methodology for dam removal monitoring and the results of two case studies is presented: Mendaraz dam (Urumea River) and Inturia dam (Leitzaran River), both located in Gipuzkoa. This monitoring is conducted by river survey cross-sections, measurements of processes and granulometrical analysis. Fast sediment erosion and sedimentation together with...
Article
Full-text available
A methodology for dam removal monitoring and the results of two case studies is presented: Mendaraz dam (Urumea River) and Inturia dam (Leitzaran River), both located in Gipuzkoa. This monitoring is conducted by river survey cross-sections, measurements of processes and granulometrical analysis. Fast sediment erosion and sedimentation together with...
Article
Full-text available
Small hydropower plants (SHP) affect river flow and sediment transport and thus impact river morphology. Eight hydropower schemes were studied along the meandering middle and lower reaches of Aragón River (Spain) to assess their effects on channel morphology and sediment dynamics from 1927 to 2010. GIS tools were used to measure changes in fluvial...
Conference Paper
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Arga and Aragón Rivers have registered at their confluence an important fluvial dynamics until the middle of 20th century. However the impacts given in both basins have intensively reduced it and have affected the fluvial planform and sediment yield. A grain size characterization of the sediments on all the sediment bars has been done in order to s...
Conference Paper
Full-text available
The geomorphological monitoring made for one year after the dam removal of Mendaraz (Gipuzkoa) has consisted of river channel cross-sections, longitudinal profiles, lateral and vertical dynamics of river banks measurements from fix points and 200 marked trees, sediment grain size, mobility and transport assessment and river bed morphologies. River...
Article
Full-text available
On 19th and 20th October of 2012 an event of intense rainfall triggered flooding processes in the whole watershed of the Pyrenean tributaries of the Ebro basin. A brief description of rainfall data, hydrological responses and risk situations is presented. A reflection of the consequences of these floods is presented along with a necessity to change...
Article
Full-text available
An updated version of the IHG index is presented. The index is based on three appraisal parameters: 1) the functional quality of the fluvial system, including a) flow regime naturalness, b) sediment supply and mobility, and c) floodplain functionality; 2) the channel quality, including a) channel morphology and planform naturalness, b) riverbed con...
Conference Paper
Full-text available
Geographical Information Systems tools are of great interest for the evaluation of changes in land-use and for the delimitation of Fluvial Territory, here applied in the confluence of Arga and Aragón Rivers. The results show an important reduction of the surface of natural areas and therefore an increase of the anthropogenic ones. The definition of...
Conference Paper
Full-text available
ABSTRACT Fluvial geomorphology can be used as a diagnostic tool to assess the state of a river system and also for the spatial and temporal monitoring of channel restoration or rehabilitation actions. For these objectives a wide range of geomorphological control variables, processes, forms, attributes, indexes and ratios can be used. Within all of...
Article
Full-text available
Channel and floodplain changes in the Aragón-Arga river confluence. A diachronic analysis of the evolution of river system using GIS tools has been developed. With georeferenced aerial photographs and orthoimages, has been quantified and mapped both the evolution of channel planform as changes in land uses in the floodplain. The most significant ch...
Conference Paper
Full-text available
Es necesario un cambio de mentalidad y un replanteamiento de principios, criterios, métodos y objetivos para desarrollar nuevas propuestas de gestión y restauración fluvial. La geomorfología fluvial es reivindicada como ciencia básica en el diagnóstico del estado ambiental y como clave para el diseño de programas de gestión y restauración. El terri...

Citations

... In the context of the Ebro River Basin and its main course, a process of notable population, territorial, environmental and technological changes was witnessed in the central decades of the 20 th century, which has been analyzed from very different perspectives and in different scenarios (e.g. Beguería et al., 2003;Batalla et al., 2004;Domenech et al., 2008;Cabezas et al., 2009;García Ruiz and Lana-Renault, 2011;Lorenzo et al., 2012;García Vera, 2013;López Moreno et al., 2011Ollero et al., 2015Ollero et al., , 2017Sánchez Fabre et al., 2017). In these referenced works, these changes began to be reservedly associated with the global context of consolidation of the "Anthropocene". ...
... Si el grado de perturbación es de una intensidad muy elevada, capaz de superar los umbrales de resiliencia soportables por el río, este entra en un estado de degradación que, en ocasiones, es irreversible. En el último siglo la situación ha sido especialmente dramática, con un enorme legado de impactos negativos que han supuesto la pérdida de numerosos tipos fluviales, simplificándose su geodiversidad y biodiversidad (Ollero et al., 2016). ...
... It is also an index that can give us a better picture about erosivity or aggressiveness of precipitation and its effects on soil erosion than the usual indices based on monthly precipitation (Bessaklia et al. 2018), such as the monthly precipitation concentration index developed by Oliver (1980) and the modified Fournier Index developed by Arnoldus (1980). This is an important subject in many countries because erosion reduces soil fertility, modifies the conditions for crops, alters agricultural practices and causes the rapid clogging of reservoirs (Scholz et al. 2008;Ibisate et al. 2016). There are two country groups more affected by soil erosion: very arid countries with poor vegetation cover and countries with high precipitation. ...
... El Índice HidroGeomorfológico IHG (figura 1) se presentó públicamente por primera vez en el XIII Congreso de la Asociación Española de Limnología, celebrado en Barcelona en julio de 2006 (Ollero et al., 2006). A continuación se publicó en las revistas Geographicalia (Ollero et al., 2007) y Limnetica (Ollero et al., 2008) para darlo a conocer, respectivamente, en los contextos académicos y técnicos de la Geografía y de la Biología, especialmente implicados en la evaluación del estado ecológico de los ríos. ...
... Los geógrafos españoles han participado en escasas publicaciones científicas y técnicas sobre restauración fluvial, destacando entre otras las de Ollero y Sánchez Fabre (2007), Ollero (2008Ollero ( , 2011aOllero ( , 2011bOllero ( , 2011cOllero ( , 2015, Berastegi et al. (2008), CIREF (2010), Ollero et al. (2010Ollero et al. ( , 2011Ollero et al. ( , 2014, Ballarín y Rodríguez (2013), Ibisate et al. (2014) y Horacio (2014. En ellas se ha trabajado fundamentalmente en aportaciones teóricas a los principios y objetivos de restauración, así como en diagnóstico y seguimiento. ...
... Esta opción ya se ha llevado a cabo en más de 3800 presas en el mundo (Ding et al., 2019), aunque principalmente se realiza en azudes y pequeñas presas que han quedado obsoletas. En la Península destacan los ejemplos de Gotera y Retuerta (Primo y González, 2015) en la cuenca del Duero en los años 2011 y 2014 (respectivamente), Robledo de Chavela en la Cuenca del Tajo en el año 2014, e Inturia en la cuenca del Oria entre 2013 y 2016 (Ollero et al., 2014;Ibisate et al., 2016). ...
... Una solución fundamental aportada por la Geografía Física a la gestión de riesgos en diferentes países es el espacio para el río o territorio fluvial (Ollero e Ibisate, 2012), una banda natural lo suficientemente ancha y continua en la que el curso de agua puede erosionar, desbordarse y reducir energía, resguardando los usos humanos damnificables, que quedan prudentemente alejados (figura 7). Es una aportación de ordenación del territorio que va siendo progresivamente puesta en práctica bajo diferentes denominaciones y condicionantes, pero en una línea continua e imparable. ...
... Se procedió correctamente, desde antes de la demolición, al seguimiento de parámetros biológicos (macroinvertebrados bentónicos) y físicos (Gaspar y Azpiroz, 2011). Pero el seguimiento hidrogeomorfológico no se propuso hasta 6 meses después del derribo, en la primavera de 2011, cuando ya se habían observado importantes cambios en el cauce, con rápida movilización de sedimentos aguas abajo y un proceso de erosión remontante aguas arriba del obstáculo eliminado (Ollero et al., 2012). ...
... 3. Unidades y cubiertas que ocupan el Territorio Fluvial (Tabla 4), ya sean naturales o antropizadas. Estas categorías han sido definidas teniendo como referencia distintos trabajos (Serrano & Longares, 2010;Acín et al., 2011;Belletti et al., 2014;Lallias-Tacon, 2017), aunque con ligeras diferencias debido a las peculiaridades del área de estudio. ...
... Igualmente son controladas por condiciones locales como el confinamiento y pendiente del valle, el sustrato, la vegetación de ribera o los usos del suelo (Hey y Thorne, 1986). A causa de esta riqueza y complejidad de elementos e interacciones, los sistemas fluviales son ante todo libertad geomorfológica, es decir, dinámica pura, actividad y cambio constante (Ollero et al., 2011). Son los grados de libertad (en la forma en planta, en la anchura, en la profundidad, en la pendiente, en la rugosidad del lecho) que diferencian con claridad un río de un canal de hormigón (Martín Vide, 2006; Charlton, 2007). ...