Valérie Borrell Estupina

Valérie Borrell Estupina
Université de Montpellier | UM1 · Laboratoire HydroSciences Montpellier

About

101
Publications
10,516
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848
Citations
Citations since 2016
3 Research Items
458 Citations
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2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080

Publications

Publications (101)
Article
Full-text available
The climate change impact on mean and extreme precipitation events in the northern Mediterranean region is assessed over high resolution EuroCORDEX and MedCORDEX simulations. The focus is made on three regions, the Lez and the Aude located in France, and the Muga, located in northeastern Spain and eight pairs of global and regional climate models a...
Article
Full-text available
The climate change impact on mean and extreme precipitation events in the northern Mediterranean region is assessed using high-resolution EuroCORDEX and MedCORDEX simulations. The focus is made on three regions, Lez and Aude located in France, and Muga located in northeastern Spain, and eight pairs of global and regional climate models are analyzed...
Article
Karst aquifers provide water resource for a large part of the Mediterranean population and water resource become a strategic problem during summer when population increases due to tourism. To help managers to optimize the exploitation of karst aquifer waters this paper studies the ability of a neural model to efficiently simulate and forecast water...
Conference Paper
Full-text available
Ability of the multilayer perceptron to model the inverse relation of a fictitious watershed is investigated. Comparison is done between a new formulation of data assimilation and the standard multilayer perceptron applied to three kinds of models: static, feed forward and recurrent. It appears that both techniques are equivalent and allow a very g...
Conference Paper
Flash floods are often responsible for many deaths and involve many material damages. Regarding Mediterranean karst aquifers, the complexity of connections, between surface and groundwater, as well as weather non-stationarity patterns, increase difficulties in understanding the basins behaviour and thus warning and protecting people. Furthermore, g...
Chapter
Full-text available
Flash floods forecasting in the Mediterranean area is a major economic and societal issue. Specifi- cally, considering karst basins, heterogeneous structure and nonlinear behaviour make the flash flood forecasting very difficult. In this context, this work proposes a methodology to estimate the contribution from karst and non-karst components using...
Article
Full-text available
Flash floods are often responsible for many deaths and involve many material damages. Regarding Mediterranean karst aquifers, the complexity of connections, between surface and groundwater, as well as weather non-stationarity patterns, increase difficulties in understanding the basins behaviour and thus warning and protecting people. Furthermore, g...
Article
Full-text available
During a flood event over a karst watershed, the connections between surface and ground waters appear to be complex ones. The karst may attenuate surface floods by absorbing water or contribute to the surface flood by direct contribution of karst waters in the rivers (perennial and overflowing springs) and by diffuse resurgence along the hillslopes...
Article
Full-text available
The paper is now accessible and open for Interactive Public Discussion until 03 Jun 2015 at: http://www.hydrol-earth-syst-sci-discuss.net/12/3681/2015/ Please don't hesitate to contribute ... Abstract Flash floods pose significant hazards in urbanised zones and have important human and fi-nancial implications in both the present and future due...
Article
Full-text available
Assessing water supply sustainability is crucial to meet stakeholders' needs, notably in the Mediterranean. This region has been identified as a climate change hot spot, and as a region where water demand is continuously increasing due to population growth and the expansion of irrigated areas. The Herault River catchment (2500 km(2), France) is a t...
Article
During a flood event over a karst watershed, the connections between surface and ground waters appear to be complex ones. The karst may attenuate surface floods by absorbing water or contribute to the surface flood by direct contribution of karst waters in the rivers (perennial and overflowing springs) and by diffuse resurgence along the hillslopes...
Article
Full-text available
Karst aquifers can provide previously untapped freshwater resources and have thus generated considerable interest among stakeholders involved in the water supply sector. Here we compare the capacity of two systemic models to simulate the discharge and piezometry of a karst aquifer. Systemic models have the advantage of allowing the study of heterog...
Chapter
Full-text available
Karst hydrosystems constitute important water resource but their recharge and emptying process are poorly known and quantified. Water resource management is thus difficult. Nevertheless, it is a major issue when rainfall is not uniformly distributed during the year, as in Mediterranean climate. This study proposes a method based on neural networks...
Conference Paper
Full-text available
Les hydrosystèmes karstiques sont souvent perçus comme des aquifères intéressants pour la ressource en eau mais peu exploités du fait de leur complexité de fonctionnement tant par rapport à leurs étiages que par rapport à leurs crues. Les travaux récents sur la modélisation hydrodynamique des aquifères karstiques par réseaux de neurones ont permis...
Conference Paper
Full-text available
Flash floods, particularly in Mediterranean regions, are a rare but destructive event, and difficult to forecast. This difficulty is due to the high rainfall intensities and total amount, the high spatial variability of rainfall, the short response time of small watershed, but also to the lack of observations during these events. Moreover, the pres...
Conference Paper
Full-text available
Many Mediterranean watersheds are composed by or linked with karstic systems. During a rainfall event, different parameters influence their recharge and drained runoff such as: the state and humidity of soil or the epikarst, the rainfall intensity, the cumulative precipitated water and the internal structure of the karstic system. As a consequence,...
Article
Full-text available
Artificial neural networks (ANN) are nonlinear models widely investigated in hydrology due to their properties of universal approximation and parsimony. Their performance during the training phase is very good, and their ability to generalize can be improved by using regularization methods such as early stopping and cross-validation. In our researc...
Article
Full-text available
This article addresses the critical need for a better quantitative understanding of how water resources from the Herault River catchment in France have been influenced by climate variability and the increasing pressure of human activity over the last 50years. A method is proposed for assessing the relative impacts of climate and growing water deman...
Conference Paper
L’utilisation de produits phytosanitaires en agriculture intensive a permis l’augmentation et le maintien de hauts rendements. La contamination des milieux comme les impacts sanitaires sont aujourd’hui avérés. La propagation de ces produits sous l'effet de forçages aériens et hydrodynamiques pourrait conduire à l’exposition de la population général...
Article
As it is the case with many karst aquifers, the Lez basin (southern France) is heterogeneous and thus difficult to model. Due to its supply of fresh water and its ability to reduce flooding however, more in-depth knowledge of basin behavior has proven critical. In addressing this challenging issue, an original methodology based on neural networks i...
Conference Paper
Full-text available
Assessing water supply capacity is crucial, notably in the Mediterranean region, identified as a hot-spot of climate change and where water demands have been continuously increasing. The Hérault River catchment (France) is representative of this context since its discharge has undergone a significant decrease over recent decades. A modelling framew...
Conference Paper
Full-text available
Assessing water supply capacity is crucial, notably in the Mediterranean region, identified as a hot-spot of climate change and where water demands have been continuously increasing. The Hérault River catchment (France) is representative of this context since its discharge has undergone a significant decrease over recent decades. A modelling framew...
Article
Assessing water supply capacity is crucial to meet stakeholders' needs, notably in the Mediterranean region. This region has been identified as a climate change hot spot, and as a region where water demand is continuously increasing due to population growth and the expansion of irrigated areas. The Hérault River catchment (2500km(2), France) is a t...
Article
Full-text available
Mediterranean catchments in southern France are threatened by potentially devastating fast floods which are difficult to anticipate. In order to improve the skill of rainfall-runoff models in predicting such flash floods, hydrologists use data assimilation techniques to provide real-time updates of the model using observational data. This approach...
Article
The Cesse-Pouzols karst hydrosystem, currently exploited, is located in the Languedoc-Roussillon in the Minervois area. The complex geology of this area arose a pluridisciplinary interest (geology, hydrogeology and geomorphology), without bringing a global hydrogeologic functioning. From the analysis between precedent works and new observations abo...
Article
Full-text available
The Cesse-Pouzols karst hydrosystem, currently exploited, is located in the Languedoc-Roussillon in the Minervois area. The complex geology of this area arose a pluridisciplinary interest (geology, hydrogeology and geomorphology), without bringing a global hydrogeologic functioning. From the analysis between precedent works and new observations abo...
Article
Full-text available
In southern France, flash flood episodes frequently cause fatalities and severe damage. In order to inform and warn populations, the French flood forecasting service (SCHAPI, Service Central d'Hydrométéorologie et d'Appui à la Prévision des Inondations) initiated the BVNE (Bassin Versant Numérique Expérimental, or Experimental Digital Basin) projec...
Article
Full-text available
This study aims to assess surface water-karst groundwater interactions during floods in the Mediterranean karst watershed of the Coulazou River (southern France) using a conceptual semidistributed model at 5 min time steps. The kinematic wave routing approximation is used for the transfer of surface flow, while overflows from a linear underground r...
Conference Paper
Full-text available
Neural networks are increasingly used in the field of hydrology due to their properties of parsimony and universal approximation with regard to nonlinear systems. Nevertheless, as a result of the non stationarity of natural variables (rainfalls and consequently discharges) it appeared as difficult to capture both dynamics (roughly slow and fast) in...
Article
Full-text available
This study investigates the hydrological functioning scheme of a Mediterranean catchment. Located in southern France, the mesoscale Hérault River catchment (~2500 km2) supplies with water its inhabitants and some external cities as well as agricultural activities. The catchment water resources are intensively exploited during summertime, when touri...
Conference Paper
Full-text available
Karst aquifers are famous for their high heterogeneity and non-linearity and are currently badly understood whereas they are a major issue on both flood forecasting and water resources. Conceptual models, for example based on reservoir concept, are often used in order to simulate their behavior (1). Nevertheless reservoir models are sensitive to th...
Article
Full-text available
Rainfall-runoff models are crucial tools for the statistical prediction of flash floods and real-time forecasting. This paper focuses on a karstic basin in the South of France and proposes a distributed parsimonious event-based rainfall-runoff model, coherent with the poor knowledge of both evaporative and underground fluxes. The model combines a S...
Article
Full-text available
The present study explores the application of a data assimilation (DA) procedure to correct the radar rainfall inputs of an event-based, distributed, parsimonious hydrological model. A simplified Kalman filter algorithm was built on top of a rainfall-runoff model in order to assimilate discharge observations at the catchment outlet. The study site...
Article
Full-text available
Les aquifères karstiques permettent d’alimenter en eau potable près de 25% de la population mondiale. Sur le pourtour méditerranéen, ils sont considérés parfois comme des châteaux d’eau naturels ou bien comme des barrages écrêteurs de crue. Ces propriétés remarquables, stimulantes de par les enjeux soulevés sont cependant difficiles à quantifier et...
Article
Full-text available
The present study explores the application of a data assimilation (DA) procedure to correct the radar rainfall inputs of an event-based, distributed, parsimonious hydrological model. A simplified Kalman filter algorithm was built on top of a rainfall-runoff model in order to assimilate discharge observations at the catchment outlet. The study site...
Conference Paper
Full-text available
The feasibility of flash flood prediction without rainfall forecasts nor previous discharge is considered. After a presentation of the important stakes involved in this task (23 fatalities in the Var event in June 2010, France) the important stage of variable and complexity selection is addressed for the small basin of Mialet (a part of the Gardon...
Conference Paper
Full-text available
Cet article propose d'appliquer un modèle par réseau de neurones pour l'identification de la relation pluie débit d'un système karstique. Le réseau est construit selon l'approche par « boîtes transparentes » de manière à représenter différentes zones au sein même du bassin d'alimentation de la source. Cette architecture particulière per