R. Jimenez-Espinosa et al. : Time and Space Forecasting of Nitrate and Salinity Contents
73
In the AG reservoir there is a concentration of high values (- 5000 f..LS/cm) in the
zone of Sector III (Southwest of Aguadu\ce village) through the different months
with a dangerous area that is spreading towards the SE (sea) and in the direction of
western Aguadu\ce village. A constant increase in the spreading of the polluted
area is seen. Seasonal variations (Fig. 7) are not clear. The BM zone is less
polluted, with values less than 4000 f..LS/cm. and a clear and constant increase of
this area through time (Fig. 7). A more polluted zone appears in May of 1988,
located next to the Sector III area. This could indicate some type of connection
between both aquifers. In the western part, a zone with smaller values (1000
f..LS/cm) appears. This disposition could suggest a separation between the two parts,
the most and the least polluted. This separation could denote the presence of a
main fault in this area.
Layer L3: This layer is in relation to AG and BM aquifers and corresponds to the
more superficial material, the detritic Quaternary. In L3 both aquifers present
similar values of conductivity (see Fig. 3 and 6), although values of AG tend to be
superior to BM ones. Values of these variables in BM in layer L3 are higher than
in layer L2, although not very different, because a connection between these two
layers might exist.
In the AG aquifer, values of L2 are bigger than those of L3, but we have already
commented on the fact that values of L2 in AG are in the most pumped area of the
Campo de Dalias. In order to do a spatial study of conductivity through time, an
analysis of the interpolation of this variable was made. Experimental data for this
layer are concentrated in several areas and not spread over the Campo de Dalias.
Specifically, in the BM aquifer these points appear in the western part of the
Campo (zone of Balerma) and in the area of Mojonera and Las Marinas villages.
In AG aquifer wells are located mainly along the coastal border (Fig. 1).
The most polluted areas in the Aguadu\ce reservoir are located around Roquetas
village and this area increases through time northwards and to the coastal line.
However, special care must be taken because of the few points that exist (Fig. 8).
In the zone of Mojonera and Las Marinas of the BM aquifer, the area of highest
values appears in 1988 to be restricted around Mojonera zone, and in 1989 a new
polluted area arises in Las Marinas. In general, an increase in conductivity values
through time is seen in this aquifer (Fig. 8).
In the zone of Balerma, well 295 presents a high value in conductivity that
produces a rich zone in the area of Guardias Viejas village. In successive years a
clear reduction in the value of this point produces a diminution of the anomalous
area and even its disappearance. However, another high value appears in 1989 in
the area of Balerma village, giving a zone of elevated values.
3.2 Evolution of nitrates
Layer LI: This layer is the least polluted for this variable in the region. Average
values in the Aguadu\ce and Balanegra aquifers are similar, around 20 mg/I;
although a trend to increase this average value is shown in both aquifers, reaching
30 mg/l in Band 40 mg/l in AG. The behaviour in the two aquifers is parallel, and
in this case, the definition of a single layer for this lithology is fully justified
(Fig. 9 and 10). In general, we can consider that this layer Ll is not very affected
by nitrate pollution, but the trend seems to be towards an increase in N03
concentrations. Therefore, special care must be taken to preserve this layer from
nitrification. The spatial analysis through time indicates the appearance, in the
73
In the AG reservoir there is a concentration of high values (- 5000 f..LS/cm) in the
zone of Sector III (Southwest of Aguadu\ce village) through the different months
with a dangerous area that is spreading towards the SE (sea) and in the direction of
western Aguadu\ce village. A constant increase in the spreading of the polluted
area is seen. Seasonal variations (Fig. 7) are not clear. The BM zone is less
polluted, with values less than 4000 f..LS/cm. and a clear and constant increase of
this area through time (Fig. 7). A more polluted zone appears in May of 1988,
located next to the Sector III area. This could indicate some type of connection
between both aquifers. In the western part, a zone with smaller values (1000
f..LS/cm) appears. This disposition could suggest a separation between the two parts,
the most and the least polluted. This separation could denote the presence of a
main fault in this area.
Layer L3: This layer is in relation to AG and BM aquifers and corresponds to the
more superficial material, the detritic Quaternary. In L3 both aquifers present
similar values of conductivity (see Fig. 3 and 6), although values of AG tend to be
superior to BM ones. Values of these variables in BM in layer L3 are higher than
in layer L2, although not very different, because a connection between these two
layers might exist.
In the AG aquifer, values of L2 are bigger than those of L3, but we have already
commented on the fact that values of L2 in AG are in the most pumped area of the
Campo de Dalias. In order to do a spatial study of conductivity through time, an
analysis of the interpolation of this variable was made. Experimental data for this
layer are concentrated in several areas and not spread over the Campo de Dalias.
Specifically, in the BM aquifer these points appear in the western part of the
Campo (zone of Balerma) and in the area of Mojonera and Las Marinas villages.
In AG aquifer wells are located mainly along the coastal border (Fig. 1).
The most polluted areas in the Aguadu\ce reservoir are located around Roquetas
village and this area increases through time northwards and to the coastal line.
However, special care must be taken because of the few points that exist (Fig. 8).
In the zone of Mojonera and Las Marinas of the BM aquifer, the area of highest
values appears in 1988 to be restricted around Mojonera zone, and in 1989 a new
polluted area arises in Las Marinas. In general, an increase in conductivity values
through time is seen in this aquifer (Fig. 8).
In the zone of Balerma, well 295 presents a high value in conductivity that
produces a rich zone in the area of Guardias Viejas village. In successive years a
clear reduction in the value of this point produces a diminution of the anomalous
area and even its disappearance. However, another high value appears in 1989 in
the area of Balerma village, giving a zone of elevated values.
3.2 Evolution of nitrates
Layer LI: This layer is the least polluted for this variable in the region. Average
values in the Aguadu\ce and Balanegra aquifers are similar, around 20 mg/I;
although a trend to increase this average value is shown in both aquifers, reaching
30 mg/l in Band 40 mg/l in AG. The behaviour in the two aquifers is parallel, and
in this case, the definition of a single layer for this lithology is fully justified
(Fig. 9 and 10). In general, we can consider that this layer Ll is not very affected
by nitrate pollution, but the trend seems to be towards an increase in N03
concentrations. Therefore, special care must be taken to preserve this layer from
nitrification. The spatial analysis through time indicates the appearance, in the