Censo, tipología y puesta en valor de los cauces de gravas del Pirineo Central y su piedemonte meridional

Abstract

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 se ha identificado un total de 224 tramos de cauces gravas que han sido analizados según las variables de longitud, superficie de cuenca hasta el tramo, anchura y colonización vegetal del tramo. Los datos de estas variables para cada tramo han sido comparados entre sí. A partir de las características específicas de los cauces de gravas en el área de estudio y las variables básicas analizadas se han identificado cuatro tipologías: torrentes y barrancos de montaña, cauces de barras mal definidas, cauces trenzados y cauces divagantes. En fases posteriores se abordará la evolución, así como los impactos y presiones que amenazan su pervivencia y faciliten la propuesta de medidas de conservación, protección y restauración.

We show the first steps of a project that seeks the enhancement of the very threatened gravel-bed rivers in risk of disappearing, at the time of having a high geomorphological heritage value. A census and a preliminary typology of gravel-bed rivers in the central Pyrenees of Aragón are presented. A total of 224 gravel-bed reaches were identified through photointerpretation and their length, width, basin surface and riparian colonization was studied. The results of these variables were compared each other. Based on the specific characteristics of the gravel-bed rivers of the study area and the basic variables four typologies were identified: mountain gullies and ravines, streams with undefined bars, braided rivers and wandering rivers. In next phases of the study the evolution, as well as the impacts and pressures that endangered its continued existence, will be analyzed with the aim of proposing conservation, protection and restoration measures.

[EN]We show the first steps of a project that seeks the enhancement of the very threatened gravel-bed rivers in risk of disappearing, at the time of having a high geomorphological heritage value. A census and a preliminary typology of gravel-bed rivers in the central Pyrenees of Aragón are presented. A total of 224 gravel-bed reaches were identified through photointerpretation and their length, width, basin surface and riparian colonization was studied. The results of these variables were compared each other. Based on the specific characteristics of the gravel-bed rivers of the study area and the basic variables four typologies were identified: mountain gullies and ravines, streams with undefined bars, braided rivers and wandering rivers. In next phases of the study the evolution, as well as the impacts and pressures that endangered its continued existence, will be analyzed with the aim of proposingconservation, protection and restoration measures.