Mercedes Vélez-NicolásUniversidad de Cádiz | UCA
Mercedes Vélez-Nicolás
Doctor of Marine Sciences and Technologies
Postdoctoral researcher
About
29
Publications
3,665
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174
Citations
Introduction
Additional affiliations
January 2019 - June 2019
Position
- Researcher
Description
- REMABAR Project: Analysis of strategies to reduce evaporation losses and improve the state of aquifers under a context of climate change in the Barbate river basin
Education
December 2019 - December 2022
October 2013 - December 2014
September 2006 - September 2013
Publications
Publications (29)
Se analizan los cambios en el acuífero costero de Chipiona durante el último medio siglo, motivados por las transformaciones agrarias y la gestión de los recursos hídricos en la comarca. El acuífero pasó de sufrir procesos de sobreexplotación e intrusión marina en los años 90, a un incremento en el almacenamiento por la reducción de bombeos y la ma...
Eight spatial interpolation models were used to map the spatial distribution of precipitation in the southwestern sector of the Iberian Peninsula (22330 km 2) over 40 years (1980/1981-2019/2020). Rainfall data from 103 meteorological stations were used to generate the interpolation models, namely inverse distance weight (IDW) with 6, 12 and 24 poin...
La dinámica del aire en sistemas kársticos determina, en buena medida, la hidrogeoquímica del agua subterránea o la intensidad del proceso de karstificación (e.g., Yanes y Moral, 2023), ya que los patrones de ventilación influyen significativamente en la circulación y almacenamiento del CO2 en estos sistemas.
Dado que el aire de la zona vadosa pres...
La decimotercera edición del Geolodía en la provincia de Cádiz se centra en el islote de Sancti Petri y su entorno, donde el patrimonio geológico, histórico y natural se unen para dar lugar a uno de los principales hitos paisajísticos del Parque Natural Bahía de Cádiz. Durante la jornada, que se desarrollará en el citado islote, previo desplazamien...
Stable water isotopes are widely recognised as essential tools to trace processes within the hydrological cycle and to disentangle complex phenomena, such as regional–local atmospheric patterns, infer water balances or characterise the aquifer recharge. In this work, we characterised two post-summer precipitation events over the western sector of S...
En este trabajo se propone una metodología novedosa para la adquisición remota de información piezométrica empleando observaciones LiDAR desde dron en pozos de gran diámetro.
Se ha implementado un flujo de trabajo que abarca diferentes etapas; desde la planificación del vuelo y de los parámetros de adquisición de datos, hasta la generación de nubes...
Los embalses desempeñan un papel clave como elementos de regulación y almacenamiento de los recursos hídricos especialmente en regiones áridas y semiáridas, donde la disponibilidad de aguas superficiales es muy variable espacial e interanualmente. En este contexto, los procesos evaporativos pueden ser muy significativos y resultar en la pérdida de...
The degradation of groundwater quality due to nitrate is a widespread issue in heavily agricultural areas and a major concern for public health. Improving knowledge of the intrinsic vulnerability of aquifers with respect to the actual contamination is crucial for adequate water management and for complying with the European directives aimed at prot...
En esta duodécima edición del Geolodía, recorreremos uno de los enclaves más
pintorescos de la provincia de Cádiz, la comarca de la Janda. Durante la jornada,
mostraremos los principales rasgos geológicos de la zona, así como las
significativas transformaciones que esta ha sufrido especialmente desde la
segunda mitad del siglo XX. Además, podremos...
Las pérdidas por evaporación desde embalse son un elemento importante del balance hídrico, que debe ser considerado tanto en las etapas de planificación como de explotación especialmente en climas áridos y semiáridos. En el presente trabajo se ha estimado la evaporación media anual en un total de 78 embalses de Andalucía de más de 5 hm3 por tres mé...
Novel data-acquisition technologies have revolutionized the study of natural systems, allowing the massive collection of information in situ and remotely. Merging these technologies improves the understanding of complex hydrological interactions, such as those of wetland–aquifer systems, and facilitates their conservation and management. This paper...
In hydrogeological research, the systematic and periodic measurement of the piezometric level is fundamental to assess aquifer storage, identify recharge and discharge areas, define flow directions and to infer the balance between inputs and withdrawals. Furthermore, knowledge of this variable and its fluctuations is essential for the efficient man...
Este Geolodía 2022 se localiza en la vertiente atlántica de Cádiz en torno al litoral de Cabo Roche. Visitaremos playas, acantilados y calas donde veremos geomorfologías tales como terrazas marinas, dunas, derrumbes, cárcavas y depósitos marinos emergidos de edades que van desde Mioceno superior (7,3 Ma) al inicio del Cuaternario (2,56 Ma). En la e...
The standardized precipitation index (SPI) provides reliable estimations about the intensity, magnitude and spatial extent of droughts in a variety of time scales based on long-term precipitation series. In this work, we assess the evolution of monthly precipitation in the Barbate River basin (S. Iberian Peninsula) between 1910/11 and 2017/18 throu...
Resumen: La definición de la geometría de los sistemas hidrogeológicos abarca aspectos como la morfología del muro, la disposición de las formaciones litológicas, la compartimentación tectónica, así como otros aspectos morfoestructurales, lo que resulta fundamental para el conocimiento de su funcionamiento y por tanto, es útil para lograr una mejor...
En el presente trabajo se describe una metodología dirigida a la obtención continua y sistemática de datos de precipitación mediante una red de pluviocaptores de diseño propio y bajo coste. El objetivo final es caracterizar desde el punto de vista cuantitativo, hidroquímico e isotópico el fenómeno de la precipitación, considerada como principal señ...
We are celebrating the 10th anniversary of the Cadiz Geolodays, dedicating this edition to show various aspects of the geology of our capital. We begin with an introductory lecture about the geological setting and its evolution. After, at different stops a walk will take us to the few outcrops of the rocky substrate on which the city is located. Th...
In less than two decades, UASs (unmanned aerial systems) have revolutionized the field of hydrology, bridging the gap between traditional satellite observations and ground-based measurements and allowing the limitations of manned aircraft to be overcome. With unparalleled spatial and temporal resolutions and product-tailoring possibilities, UAS are...
This study presents a novel review of seven case histories of Andalusian reservoirs (Southern Spain) affected by different hydrological and hydrogeological problems that have led to severe malfunctions. The failures reported are related to (i) water quality degradation due to salinization and acid mine drainage, (ii) leakage in karstified terrains,...
The present work addresses the evolution of monthly precipitation in the Barbate river basin (province of Cadiz) over a period of 108 years through the analysis of data gathered from 67 rainfall monitoring stations. The records were processed and completed to generate a representative precipitation series for the period comprised between the hydrol...
This work presents some of the results obtained from a survey research that is currently being conducted among water users in the Barbate river basin area. The purpose of the survey questionnaires is to evaluate the use, opinions and extent of knowledge of the local population about water resources, especially groundwater, in the region. The questi...
In recent years, the European Space Agency (ESA) has achieved significant progress through the Copernicus program, which allows monitoring changes in land, oceans or in the atmosphere. The added value of this program lies in its open access and the highly detailed time-space resolution. In combination with other datasets on land use, climate or hyd...
The uncertainty in traditional hydrological modeling is a challenge that has not yet been
overcome. This research aimed to provide a new method called the hybrid causal–hydrological (HCH) method, which consists of the combination of traditional rainfall–runoff models with novel hydrological approaches based on artificial intelligence, called Bayesi...
The launch of the European Higher Education Area in 2010 has imposed new methods on European universities. Nowadays, university education aims to provide students with useful and applicable skills (Justo & Delgado, 2015; Walther et al., 2011) for the current labour market (Aparicio & Ruiz-Teran, 2007). For this reason, research constitutes the key...
Reversing the chemical and quantitative impacts derived from human activity on aquifers demands a multidisciplinary approach. This requires, firstly, to update the hydrogeological knowledge of the groundwater systems, which is pivotal for the sustainable use of this resource, and secondly, to integrate the social, economic and administrative realit...
Field video-guide for the "Geolodía Cadiz 2020". A geological field trip video-guide to show the geological point of interest in the dawntown of Cadiz
The present work, part of the project REMABAR and co-funded by Fundación Biodiversidad, is aimed at the development of a species inventory that contributes to the knowledge of the Barbate river basin and mitigates the current lack of information about this region. As the result of a thorough bibliographic research, data and records of more than 674...
