hydrogeological studies previous to the artificial recharge … · 2007-07-27 · 2- hydraulic in...

SEPTEMBER 2002

HYDROGEOLOGICAL STUDIES PREVIOUS TO THE ARTIFICIAL RECHARGEOF LOS ARENALES AQUIFER, DUERO BASIN (SPAIN)

A.E. FERNÁNDEZ ESCALANTE PhD student. Madrid, SpainJ. LÓPEZ GUTIÉRREZ Geological Survey of Spain, Valencia, Spain

The intensive rate of groundwater exploitation in several areas of “Los Arenales” aquifer (Duero Basin, Spain) has originated a remarkable descent of water heads. Consecuently, Spanish government (MAPA) began several

studies based on artificial superficial recharge in order to minimize environmental impacts in two areas: Santiuste Basin and Carracillo Region

The stages of the employed methodology studied so as to determine the most adequate recharge method and facilities design in each area and the volume of water involved are described downwards:

• IMPROVEMENT OF AQUIFERS STRUCTURE AND HYDROGEOLOGICAL BEHAVIOR KNOWLEDGE:1- 3D palaeogeography reconstruction of the wind-sand detrital aquifer with geoelectrical prospecting works (147 vertical electrical logs in Santiusteand 607 in Carracillo), with respectively 14 and 34 investigation core borings parametric boreholes drilled.2- Hydraulic in situ (wells) or laboratory tests: 10 and 18 pumping tests, 6 and 12 in situ infiltration tests, 16 and 18 in laboratory3- There were inventories of 234 and 452 water points in order to update the hydrogeological mapping.4- Measurements of the current river flows at 2 and 19 stations. 5-,Monitoring nets have been designed composed by 41 and 111 water points with the aim of controlling the heads evolution of the aquifer6- Hydrochemical nets of 28 and 48 points and Artificial Recharge nets with 6 and 24 piezometers located on both sides of the recharge ditch.7- Integration of data in a mathematical model (Modflow), that will be operative in 2003 year in Santiuste, while it is already operative in Carracillo

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CUBETA DE SANTIUSTE

SANTIUSTE BASIN CARRACILLO REGION

TASKS ACCOMPLISHED

The results suggest that this aquifer is appropriate for artificial recharge application, the methodology is feasible and useful to other similar aquifers,and the consequences of its application should be profitable in agriculture benefits, environmental alterations and social acceptation

Conclusion

Geophysical prospecting

Mathematical model(Modflow)

3D palaeogeography reconstruction

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REMONDO

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ARROYO DE CUÉLLAR

SANCHONUÑO

DEHESA MAYOR

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NARROS

CHATÚN

GOMEZSERRACÍN

FUENTE EL OLMO DE ISCAR

SAMBOAL PINAREJOS ZARZUELA DEL PINAR

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ESCALA 1:80.000Equidistancia entre las curvas de nivel: 5 mCartografía digital de base: IGN 1:25.000

MINISTERIO DE AGRICULTURA, PESCA Y ALIMENTACIÓN

TÍTULO DEL PROYECTO: "PROYECTO DE INVESTIGACIÓN HIDROGEOLÓGICA Y OBRAS DE APOYO PARA LA DEFINICIÓN DEL ACUÍFERO DE LOS ARENALESEN LA COMARCA DE "EL CARRACILLO" (SEGOVIA)TITULO: MAPA TOPOGRÁFICO- ACTUACIONES GEOFÍS ICAS

ESCALA:1:80.000

OCTUBRE 2000

Nº MAPA:1

EL DIRECTOR DEL ESTUDIO:

EL INGENIERO DE MONTES D. RAMÓN GALÁN LÓPEZ

SECRETARÍA GENERAL DE AGRICULTURA Y ALIMENTACIÓNDIRECCIÓN GENERAL DE DESARROLLO RURAL

MAPA TOPOGRÁFICO CONACTUACIONES GEOFÍSICAS

LEYENDA:

Núcleo urbano

Red hidrográfica

Carreteras

Sondeo Eléctrico Vertical(SEV)

34

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SAMBOAL PINAREJOS ZARZUELA DEL PINAR

MAPA DE ISOPACAS DELACUÍFERO CUATERNARIO

ESCALA 1:80.000Equidistancia entre las líneas: 3 mCartografía digital de base: IGN 1:25.000

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LEYENDA:

Núcleo urbano

Red hidrográfica

Carreteras

MINISTERIO DE AGRICUL TURA, PESCA Y ALIMENTACIÓN

TÍTULO DEL PROYECTO: "PROYECTO DE INVESTIGACIÓN HIDROGEOLÓGICA Y OBRAS DE APOYO PARA LA DEFINICIÓN DEL ACUÍFERO DE LOS ARENALESEN LA COMARCA DE "EL CARRACILLO" (SEGOVIA)TITULO: MAPA DE ISOPACAS

ESCALA:1:80.000

OCTUBRE 2000

Nº MAPA:6

EL DIRECTOR DEL ESTUDIO:

EL INGENIERO DE MONTES D. RAMÓN GALÁN LÓPEZ

SECRETARÍA GENERAL DE AGRICULTURA Y ALIMENTACIÓNDIRECCIÓN GENERAL DE DESARRO LLO RURAL

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0 10kmsPosition map in Iberian peninsule

Sandy Cuaternary aquifer isopaques map

Tertiary outcrops belowsandy cuaternary aquifer

Artificial recharge building works

Monitoring nets

Sandy Cuaternary aquifer monitoring netsRed- headsBlue- periodic hydrochemical analysis

4

Hydrogeological cartography and profiles

Mozarabic Coca castle

Difuse discharge of the aquifer at Voltoya river terraces

Geophisycal prospecting map

Further information: http://es.geocities.com/hidrogeo2002/

Galán et al. 2001.

Reference conditions. Galán et al. 2001.

Figura 6.-Condiciones de contorno establecidas en la modelización del acuífero del Carracillo

ESCALA 1:100.000Cartografía digital de base: IGN 1:25.000

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Red hidrográfica

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Borde impermeable

Celda de recargaconstante

Galán et al. 2001.