Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1051/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
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ISSN | 0018-6368 |
EISSN | 1958-5551 |
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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