Mapping bedrock structure beneath overburden is crucial for understanding geological and hydrogeological processes. Acquiring this information is generally done using well drilling or geophysical surveys; but these studies are expensive and require large periods of acquisition and processing time. In addition, geophysical data acquisition can be logistically challenging in urban zones with limited available areas for instrumentation deployment. Under favourable conditions (1D structure and high acoustic impedance contrast) the H/V microtremor technique can provide estimates of bedrock depth. This technique is used to obtain the soil resonance frequency in seismic microzonation studies. It is based on the computation of the horizontal to vertical spectral ratio of microtremor recordings acquired at a single station. The soil resonance frequency is related to soil shear‐wave velocity and thickness. Here we investigate the capability of combining microtremor and traditional exploration geophysical techniques (electrical resistivity and seismic tomography) to obtain an empirical relationship relating soil resonance frequency and overburden thickness. Subsequently we propose to extend microtremor measurements to adjacent areas that have not been covered by geophysical surveys. This methodology has been applied at a test site located in a granitic environment where alluvial/colluvial sediments cover the granite weathering profile. This area is characterized by urban development and sectors having rugged topography. A priori, this area has suitable conditions to apply the H/V microtremor technique. Overburden thickness has been estimated to range between 20–50 m. The proposed methodology has been validated at the test site, encouraging us to apply the H/V method as an exploration tool in similar geological environments.

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<p>En el marco del Proyecto europeo RESCCUE, las proyecciones climáticas para la ciudad de Barcelona muestran aumentos significativos de las intensidades máximas de precipitación para el horizonte del 2071-2100. En este trabajo se presenta la evaluación de la resiliencia de los servicios urbanos de la ciudad frente a episodios de inundación para condiciones de lluvia actuales y futuras. El uso de modelos sectoriales e integrados ha permitido valorar la respuesta del sistema de drenaje de la ciudad tanto a nivel de sistema de alcantarillado subterráneo como a nivel superficial analizando el comportamiento hidráulico del conjunto de las superficies urbanas (calles, plazas, parques, etc.). Por otro lado, los parámetros asociados a las inundaciones superficiales (extensión de las zonas inundables, calado y velocidad) han sido empleados para estimar potenciales afectaciones futuras en otros servicios urbanos estratégicos como el tráfico superficial, el sistema eléctrico y el sistema de recogida de residuos.</p>

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