Arid
DOI10.1051/lhb/2012011
Characterization of the interactions between subterranean and superficial fluxes within an Andean catchment as a function of the spatio- temporal variability of climate
Jourde, Herve1,3; Blanc, Mathieu1,3; Rochette, Romain1,3; Ruelland, Denis2; Hicks, Erick3; Oyarzun, Ricardo3,4
通讯作者Jourde, Herve
来源期刊HOUILLE BLANCHE-REVUE INTERNATIONALE DE L EAU
ISSN0018-6368
EISSN1958-5551
出版年2012
期号2页码:18-25
英文摘要

In the semi-arid region of Norte Chico (Chile), climate variability, mainly controlled by ENSO and LNSO events, generates a high variability of both surface water and groundwater fluxes. Taking the upper Elqui catchment as an example, this study found that, during LNSO events, the abnormally high values of the runoff coefficient may be the consequence of a groundwater contribution to surface water flow. During ENSO events, however, the lower values of the runoff coefficient and the dynamics of the water table level highlight the recharge of the subsurface compartment. For the hydrological years characterized by a high pluviometric index during the 1977-2008 period, three dynamics of interaction between groundwater and surface water are identified : (i) the water table increases before the river discharge, and its logarithmic increase highlights a rapid recharge related to the concomitance of snowmelt and rainfall events; (ii) the water table increases after the river discharge and its exponential increase shows a progressive intensification of the recharge over time; and (iii) the water table and the river discharge increase are concomitant. Dynamics (i) and (ii) are observed during the ENSO events, when precipitation occurs over a long time period; dynamic (iii) is observed during the neutral years, when high intensity precipitations occur over short periods. The analysis of these dynamics and runoff coefficients shows that when the mean annual precipitation is less than 70 mm, the relative equilibrium between runoff and recharge processes is broken, which may generate a high hydrological deficit; this threshold could thus be used as a warning for drought. Finally, the spatial variability of runoff coefficients shows a larger contribution of the subsurface compartment in catchment with a larger proportion of granites, suggesting a mountain front recharge from the alterites in the granitic watershed..


英文关键词hydro-climatic variability water resource surface/subsurface interactions snowmelt Rio Elqui North-Central Chile
类型Article
语种French
国家France ; Chile
收录类别SCI-E
WOS记录号WOS:000304238600004
WOS关键词GROUNDWATER
WOS类目Water Resources
WOS研究方向Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172720
作者单位1.Univ Montpellier 2, UMR HydroSci Montpellier, F-34395 Montpellier 5, France;
2.CNRS, UMR HydroSci Montpellier, F-34395 Montpellier 5, France;
3.Univ La Serena, CEAZA, La Serena, Chile;
4.Univ La Serena, Dept Ingn Minas, La Serena, Chile
推荐引用方式
GB/T 7714
Jourde, Herve,Blanc, Mathieu,Rochette, Romain,et al. Characterization of the interactions between subterranean and superficial fluxes within an Andean catchment as a function of the spatio- temporal variability of climate[J],2012(2):18-25.
APA Jourde, Herve,Blanc, Mathieu,Rochette, Romain,Ruelland, Denis,Hicks, Erick,&Oyarzun, Ricardo.(2012).Characterization of the interactions between subterranean and superficial fluxes within an Andean catchment as a function of the spatio- temporal variability of climate.HOUILLE BLANCHE-REVUE INTERNATIONALE DE L EAU(2),18-25.
MLA Jourde, Herve,et al."Characterization of the interactions between subterranean and superficial fluxes within an Andean catchment as a function of the spatio- temporal variability of climate".HOUILLE BLANCHE-REVUE INTERNATIONALE DE L EAU .2(2012):18-25.
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