Recharge processes in karstic systems investigated through the correlation of chemical and isotopic composition of rain and spring-waters

被引:57
作者
Aquilina, L
Ladouche, B
Dörfliger, N
机构
[1] Univ Rennes 1, CNRS, UMR 6118, Geosci Rennes,CAREN, F-35000 Rennes, France
[2] BRGM Serv Eau, F-34000 Montpellier, France
关键词
D O I
10.1016/j.apgeochem.2005.07.011
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Four karstic springs in southern France, along with rainwater in the same area, were monitored during two hydrological cycles. Stable isotopic ratios (delta O-18 and delta D) allow the contribution of the rain waters from the previous periods (discretised as winter or summer period) to the spring water to be estimated. These Computations indicate that heavy rainfall events during the autumn season contribute for 56 +/- 7% and 68 +/- 9% of the spring water discharge during the following winter and summer seasons, respectively. During the low flow period, residence time does not exceed 1 hydrological cycle, for a large part of the water. Stable isotopic ratios (delta O-18 and delta D) combined with Cl concentration allow the evapotranspiration coefficients to be estimated although the recharge surface is not known and hydrological balance can not be computed. Except for one spring, the evapotranspiration coefficients range from 0.54 to 0.38 (46-62% volume reduction), even during the high flow period. The short residence times, and the strong evapotranspiration coefficients whatever the period (winter or summer) are interpreted as the result of the major role of the epikarst reservoir in the karst recharge functioning over direct or diffuse infiltration. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2189 / 2206
页数:18
相关论文
共 36 条
[1]   Deep water circulation, residence time, and chemistry in a karst complex [J].
Aquilina, L ;
Ladouche, B ;
Doerfliger, N ;
Bakalowicz, M .
GROUND WATER, 2003, 41 (06) :790-805
[2]   Origin, evolution and residence time of saline thermal fluids (Balaruc springs, southern France): implications for fluid transfer across the continental shelf [J].
Aquilina, L ;
Ladouche, B ;
Doerfliger, N ;
Seidel, JL ;
Bakalowicz, M ;
Dupuy, C ;
Le Strat, P .
CHEMICAL GEOLOGY, 2002, 192 (1-2) :1-21
[3]  
AQUILINA L, 2005, IN PRESS J HYDROL
[4]   USE OF NATURAL ISOTOPIC TRACERS IN STUDYING FUNCTIONING OF A KARSTIC SYSTEM - OXYGEN-18 CONTENTS OF 3 SYSTEMS IN PYRENES, FRANCE [J].
BAKALOWICZ, M ;
BLAVOUX, B ;
MANGIN, A .
JOURNAL OF HYDROLOGY, 1974, 23 (1-2) :141-158
[5]  
Bakalowicz M., 1995, Hydrogeologie, V4, P3
[6]  
BARIAC T, 1988, ISOTOPES STABLES 180
[7]   Understanding groundwater sources and movement using water chemistry and tracers in a low matrix permeability terrain: the Cretaceous (Chalk) Ulster White Limestone formation, Northern Ireland [J].
Barnes, S ;
Worden, RH .
APPLIED GEOCHEMISTRY, 1998, 13 (02) :143-153
[8]   WATER-BUDGET, FUNCTIONING AND PROTECTION OF THE FONTAINE-DE-VAUCLUSE KARST SYSTEM (SOUTHEASTERN FRANCE) [J].
BLAVOUX, B ;
MUDRY, J ;
PUIG, JM .
GEODINAMICA ACTA, 1992, 5 (03) :153-172
[9]   Water vulnerability assessment in karst environments: a new method of defining protection areas using a multi-attribute approach and GIS tools (EPIK method) [J].
Doerfliger, N ;
Jeannin, PY ;
Zwahlen, F .
ENVIRONMENTAL GEOLOGY, 1999, 39 (02) :165-176
[10]  
EISENLOHR L, 1995, CR ACAD SCI II A, V321, P761