Manuel García Rodríguez

Relieve y agua en regiones graníticas: un modelo cuantitativo con aplicaciones en la gestión del agua y la geodiversidad

Se estudian las relaciones entre aspectos geomorfologicos e hidrogeologicos de las regiones graniticas y, en especial, su influencia en el balance hidrico y su papel fundamental en la interaccion entre Geodiversidad y Biodiversidad. Partiendo de un modelo conceptual, se disena un modelo cuantitativo y se aplica en cuatro escenarios que difieren por el regimen de precipitaciones y por la proporcion superficial de regolito y roca fresca. [ABSTRACT] We explore the relationships between geomorphologic and hydrogeological aspects in granitic regions, and especially its influence on the water balance and its pivotal role in the interaction between Geodiversity and Biodiversity. Based on a conceptual model, a quantitative model is designed and applied in four scenarios that differ by rainfall distribution and the surface proportion of regolith and fresh rock.

Indicaciones actuales de la osteoplastia frontal

INTRODUCTION AND OBJECTIVES Endoscopic sinus surgery is the technique of choice in most of the frontal sinus diseases, both inflammatory and tumour-related. This is why the external approach using osteoplastic flap (OF) would be limited to cases with a difficult endoscopic approach. Our aim was to review the current indications of the osteoplastic flap in the treatment of frontal sinus pathology, through a retrospective study of patients undergoing this technique. METHODS We performed a retrospective study of 14 patients who were treated with the osteoplastic flap procedure. All the surgical indication criteria, type of sinus disease, presence or absence of prior endoscopic surgery, surgical findings, complications and recurrence were reviewed. RESULTS The pathologies found were 1 osteoma (7.1%), 3 inverted papilloma (21.4%) and 10 mucoceles (71.4%). Nine patients had a prior endoscopic surgery and 10 patients had an orbital dehiscence (9 mucocele, 1 papilloma). Frontal osteoma was Grade IV and the papilloma cases were Krouse Stage III. Surgical revision was required for 21.4%. CONCLUSIONS The main indications for an OF in patients with inflammatory disease are lateral extension and frontal recess neo-osteogenesis. In osteoma cases, it depends on the size of the tumour. In inverted papilloma cases, the indication is multifocal implantation with origin in the anterior and lateral wall. In all cases, performing the osteoplastic flap must be individualised.

Formas kársticas comunes de los cenotes del Estado de Quintana Roo (México)

The present paper studies several of the cenotes located in the state of Quintana Roo (Yucatan peninsula), term used by Mexicans to explain the subterranean cavities which are permanently flooded and connected to the surface. Frequently, cenotes are connected to each other through a series of subterranean galleries and passageways that often end up into the ocean. The abundance of karst forms found on the inside of these galleries, make this area a natural museum where many of the processes that have occurred and keep occurring on its inside may be observed and interpreted. All the features showed on these cenotes in Quintana Roo, make up an extraordinary scenario for the practice of cave diving, helping to understand the complex process of karst formation on a region where fresh continental and salt water is often found mixed.

NUEVAS APORTACIONES SOBRE EL FUNCIONAMIENTO HIDROGEOLÓGICO DEL ACUÍFERO DE ERG CHEBBI EN EL ENTORNO DE HASSILABIED (MARRUECOS)

Erg Chebbi es un sistema dunar de unos 156 km2 de superficie que se localiza en el limite suroriental de Marruecos. El sistema, desde un punto de vista hidrologico, constituye un gran acuifero libre cuya recarga se produce por la infiltracion del agua de lluvia y las salidas a traves de manantiales y por extracciones desde pozos y khettaras. En los ultimos anos erg Chebbi ha experimentado un considerable incremento turistico, atraidos por la singularidad del paisaje dunar. En este sentido, la creacion de numerosos complejos hoteleros ha originado un incremento de la demanda de los recursos hidricos subterraneos. La extraccion de una mayor cantidad de agua subterranea esta produciendo un fuerte descenso del nivel freatico en las zonas mas pobladas. La comprension del funcionamiento hidrogeologico y cuantificacion de las reservas subterraneas es necesaria para el mantenimiento del sistema dunar. Siguiendo estas premisas presentamos en este trabajo el estudio hidrogeologico del area de erg Chebbi entre las localidades de Hassilabied y Merzouga como avance del estudio integrado del sistema dunar.