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1.
C. C. Bicalho C. Batiot-Guilhe J. L. Seidel S. Van Exter H. Jourde 《Environmental Earth Sciences》2012,65(8):2311-2319
The Lez karst spring, located in the Mediterranean basin (southern France) supplies drinking water to the metropolitan area
of Montpellier (France) since the nineteenth century. Since 1981, an intense pumping is being performed directly in the main
conduit with a maximum exploitation flow rate of about 1,700 l/s. To improve the understanding of groundwater origins and
circulation dynamic in this karst system, as well as the impact of three decades of intense water exploitation, groundwater
samples have been collected during various hydrologic conditions since March 2006. A previous hydrochemical study on the Lez
karst system had been carried out before the installation of the pumping plant. This dataset was compared to the present one
to identify possible changes on groundwater hydrochemistry. The results of this analysis indicate the existence of historical
changes in water hydrogeochemistry and evidence a decrease of the deep compartment participation to the Lez spring outflow.
This change in spring water hydrogeochemistry may be attributed to the intense pumping of the karst system and, in the absence
of noticeable climatic changes, expresses the direct consequences of anthropogenic forcing on the overall functioning of the
aquifer. This study aims to analyze the differences, to understand the water chemistry changes and to better foresee the aquifer
evolution for the future. 相似文献
2.
Naomi Mazzilli Hervé Jourde Thomas Jacob Vincent Guinot Nicolas Le Moigne Marie Boucher Konstantinos Chalikakis Hélène Guyard Anatoly Legtchenko 《Environmental Earth Sciences》2013,68(6):1631-1646
This work examines the relevance of the inclusion of ground-based gravity data in the calibration process of a global rainfall-discharge reservoir model. The analysis is performed for the Durzon karst system (Larzac, France). The first part of the study focuses on the hydrological interpretation of the ground-based gravity measurements. The second part of the study investigates further the information content of the gravity data with respect to water storage dynamics modelling. The gravity-derived information is found unable to either reduce equifinality of the single-objective, discharge-based model calibration process or enhance model performance through assimilation. 相似文献
3.
Assessment of groundwater recharge processes through karst vadose zone by cave percolation monitoring 
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下载免费PDF全文 Amaël Poulain Arnaud Watlet Olivier Kaufmann Michel Van Camp Hervé Jourde Naomi Mazzilli Gaëtan Rochez Romain Deleu Yves Quinif Vincent Hallet 《水文研究》2018,32(13):2069-2083
Recharge processes of karst aquifers are difficult to assess given their strong heterogeneity and the poorly known effect of vadose zone on infiltration. However, recharge assessment is crucial for the evaluation of groundwater resources. Moreover, the vulnerability of karst aquifers depends on vadose zone behaviour because it is the place where most contamination takes place. In this work, an in situ experimental approach was performed to identify and quantify flow and storage processes occurring in karst vadose zone. Cave percolation monitoring and dye tracing were used to investigate unsaturated zone hydrological processes. Two flow components (diffuse and quick) were identified and, respectively, account for 66% and 34% of the recharge. Quickflow was found to be the result of bypass phenomenon in vadose zone related to water saturation. We identify the role of epikarst as a shunting area, most of the storage in the vadose zone occurring via the diffuse flow component in low permeability zones. Relationship between rainfall intensity and transit velocity was demonstrated, with 5 times higher velocities for the quick recharge mode than the diffuse mode. Modelling approach with KarstMod software allowed to simulate the hybrid recharge through vadose zone and shows promising chances to properly assess the recharge processes in karst aquifer based on simple physical models. 相似文献
4.
Mediterranean flash flood transfer through karstic area 总被引：1，自引：0，他引：1
Vincent Bailly-Comte Hervé Jourde Axel Roesch Séverin Pistre 《Environmental Geology》2008,54(3):605-614
Karstic aquifers influence flash floods propagation in Mediterranean countries. Near Montpellier, Southern France, discharge
data are recorded on the Coulazou River upstream and downstream of the Aumelas Causse. Two gauging stations are used to describe
the hydrodynamics of this binary karstic system. The first station characterizes the non-karstic catchment area. The second
one is representative of the karstic part of the watershed. Records since April 2004 are used to understand how the river
interacts with a karstic aquifer. Hydrograph analysis of three flash flood events is described. Corresponding discharge time
series recorded at the two gauging stations are used to describe the modification of the hydrographs by auto- and crosscorrelations
analyses. Finally, linear system analyses are used to provide the transfer functions of this binary karstic system according
to the three flood events characteristics (initial conditions, volume, spatial distribution of rainfall, etc.). Theses functions
summarize the hydrodynamic behaviour of the system: their shapes are indicative of the dynamics of the storage, the release
and the contribution to surface waters.
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| Vincent Bailly-ComteEmail: |
5.
Zhixue Zhao Xiaoguang Wang Yonghong Hao Tongke Wang Abderrahim Jardani Herve Jourde Tian‐Chyi Jim Yeh Ming Zhang 《水文研究》2019,33(19):2551-2560
The study on the hydraulic properties of coastal aquifers has significant implications both in hydrological sciences and environmental engineering. Although many analytical solutions are available, most of them are based on the same basic assumption that assumes aquifers extend landward semi‐infinitely, which does not necessarily reflect the reality. In this study, the general solutions for a leaky confined coastal aquifer have been developed that consider both finitely landward constant‐head and no‐flow boundaries. The newly developed solutions were then used to examine theoretically the joint effects of leakage and aquifer length on hydraulic head fluctuations within the leaky confined aquifer, and the validity of using the simplified solution, which assumes the aquifer is semi‐infinite. The results illustrated that the use of the simplified solution may cause significant errors, depending on joint effects of leakage and aquifer length. A dimensionless characteristic parameter was then proposed as an index for judging the applicability of the simplified solution. In addition, practical application of the general solution for the constant‐head inland boundary was used to characterize the hydraulic properties of a leaky confined aquifer using the data collected from a field site at the Seine River estuary, France, and the versatility of the general solution was further justified. 相似文献
6.
Toulier Alix Lachassagne Patrick Hendrayana Heru Fadillah Arif Jourde Hervé 《Hydrogeology Journal》2023,31(3):849-851
Hydrogeology Journal - 相似文献
7.
Benoît Viguier Hervé Jourde Véronique Leonardi Elisabeth Lictevout Linda Daniele 《水文科学杂志》2020,65(9):1606-1613
ABSTRACT Using a statistical approach, Scheihing attempts to demonstrate the direct influence of recharge events in the Precordillera and the Andean Piedmont on water table variations in downstream alluvial fans. The author “unquestionably” discards the existence of ephemeral recharge processes in alluvial fans although they are frequently impacted by major floods. However, the author does not consider previous publications about recharge processes in arid alluvial fans, the hydraulic setting of the Pampa del Tamarugal Aquifer (PTA) and anthropogenic pressure changes in the PTA. Because the sustainable management of groundwater resources in drylands depends on a good understanding of hydrogeological processes, we propose a thorough reinterpretation of the short- and long-term PTA water table variations addressed by the author. In this comment, we illustrate the limits of the sole use of a statistical approach for characterizing both recharge processes and factors controlling the water table variations in the Atacama Desert. 相似文献
8.
Belkacem Bekkoussa Herve Jourde Christelle Batiot-Guilhe Mohamed Meddi Abdelkader Khaldi Habib Azzaz 《水文科学杂志》2013,58(5):1111-1127
Résumé L'origine de la salinité dans les eaux de la nappe Plio-Quaternaire de la plaine de Ghriss (Nord-Ouest de l'Algérie) et la compréhension de ses comportements hydrodynamiques et géochimiques, en réponse à certains forçages naturels et anthropiques, ont été approchées par l’étude combinée des rapports ioniques et d'analyses statistiques des données hydrochimiques. Cette étude a identifié l'alimentation latérale de l'aquifère Plio-Quaternaire par les deux principaux aquifères de la région. La salinisation des eaux de la nappe Plio-Quaternaire résulte essentiellement de la dissolution des évaporites (halite et gypse), de l'infiltration des eaux de ruissellement, et du retour à la nappe des eaux d'irrigation qui sont chargées en sels initialement reconcentrés dans le sol ou dans la zone non saturée. Les concentrations élevées en nitrates et en chlorures sont l'indice d'une pollution anthropique d'origine urbaine ou agricole qui affecte toute la plaine de Ghriss en proportions variables. Citation Bekkoussa, B., Jourde, H., Batiot-Guilhe, C., Meddi, M., Khaldi, A., et Azzaz, H., 2013. Origine de la salinité et des principaux éléments majeurs des eaux de la nappe phréatique de la plaine de Ghriss, Nord-Ouest Algérien. Hydrological Sciences Journal, 58 (5), 1111–1127. Editeur Z.W. Kundzewicz; Editeur associé S. Faye 相似文献
9.
Flash flood mitigation as a positive consequence of anthropogenic forcing on the groundwater resource in a karst catchment 总被引：1，自引：1，他引：0
Hervé Jourde A. Lafare N. Mazzilli G. Belaud L. Neppel N. Dörfliger F. Cernesson 《Environmental Earth Sciences》2014,71(2):573-583
The Mediterranean coastal region is prone to high-intensity rainfall events that are frequently associated with devastating flash floods. This paper discusses the role of a karst aquifer system in the flash floods of a Mediterranean river, the Lez river. Most of the Lez river watershed is located on karst terrains where interactions between surface water and groundwater take place. During extreme rainfall events, the presence of fractures and well-developed karst features in carbonate terrains enhances the infiltration processes and involves the concentration of the recharge into highly organized and permeable flow paths. The groundwater, therefore, quickly moves towards the natural outlets of the karst system. The influence of the Lez karst aquifer system on the associated river floods dynamics is analysed while considering the spatially distributed rainfall, as well as the time series of the groundwater level within the aquifer and of the Lez river discharge measured at various gauging stations. Special attention is given to the relative importance of the surface and underground processes involved in flash flood genesis. It is shown that the karst groundwater contributes to flash floods under certain conditions, while high-rate pumping within the karst aquifer, which generates significant drawdown, may mitigate flash floods under other conditions. 相似文献
10.
Jérôme Jourde Christine Dupuy Hien T. Nguyen David Mizrahi Nyls de Pracontal Pierrick Bocher 《Estuaries and Coasts》2017,40(4):1159-1170
In tropical South America, the mudflats of the Amazonian coast are unique because of their large size and unrivaled migration dynamics. On Guiana’s coast, macrofaunal communities are believed to be well-adapted to these dynamic conditions. In this study, the benthic macrofauna was sampled in April 2012 in the Awala-Yalimapo region of western French Guiana and at two sites in Suriname: Warappa Kreek and Bigi Pan. These sites are found 800, 920, and 1140 km from the Amazon delta, respectively. The richness, diversity, and densities of the macrofaunal communities in these mudflats are here described for the first time. Only 38 operational taxonomic units (OTUs) were recorded, among which two species were common and widely distributed: the tanaid crustacean Halmyrapseudes spaansi and the polychaete Sigambra grubii; the former represented 84% of all individuals collected, with densities reaching up to 73,000 individuals m?2. Most of the OTUs consisted of relatively small individuals (<10 mm in length). The very low richness and diversity and the small sizes of the organisms are likely linked to the instability and softness of the substrate on these mudflats. This study suggests that the differences in macrofaunal community composition among sites could be due to the migration stage of banks rather than the distance from the Amazon delta and associated effects of river discharge. 相似文献