TY - JOUR
T1 - Hydrogeophysical Monitoring of Water Infiltration in the Context of Soil Aquifer Treatment at the Shafdan Site (Israel)
AU - Haaken, K.
AU - Furman, A.
AU - Weisbrod, N.
AU - Kemna, A.
PY - 2014/12/1
Y1 - 2014/12/1
N2 - Soil Aquifer Treatment (SAT) is a sustainable technology in modern waste
water management. The Shafdan SAT facility in Israel, one of the largest
in the world, is being successfully operated for many years. However,
due to increasing amounts of waste water the infiltration capacity
approaches its limit. Our study aims at better understanding the
infiltration process and hereupon improving the efficiency of the
infiltration management using Electrical Resistivity Tomography (ERT) in
combination with hydrological methods. We installed three permanent ERT
lines within one infiltration pond close to the city of Yavneh, south of
Tel Aviv. Each line comprises 96 electrodes, separated by 2 m in one
line and 0.5 m in the other two lines. The sediments below the pond are
mainly composed of sands and porous sandstone. In order to calibrate the
ERT results, water content, temperature, and electrical conductivity
were measured in-situ at different depths in shallow regions of the
pond, and cores from Geoprobe drillings were taken for lithological
analyses. Continuous ERT monitoring was conducted over two months
spanning infiltration scenarios characterized by different flooding
sequences. The averaged apparent resistivity data over time show a clear
response which can be related to the overall water content dynamics in
the vadose zone (over 30 m). The inverted ERT images indicate that the
infiltration is strongly affected by subsurface heterogeneity. With a
view to setting up a hydrological model, we analyzed the transient
behavior of the local drying curves after breakthrough of the
infiltration front for each pixel of the ERT image sequence. This
approach represents a new, "dynamic" method for subsurface hydraulic
zonation based on time-lapse ERT. Our study shows that ERT helps to
better understand the dynamics of water infiltration processes in the
context of SAT under real-world conditions, and by this may contribute
to enhancing the efficiency of SAT facilities.
AB - Soil Aquifer Treatment (SAT) is a sustainable technology in modern waste
water management. The Shafdan SAT facility in Israel, one of the largest
in the world, is being successfully operated for many years. However,
due to increasing amounts of waste water the infiltration capacity
approaches its limit. Our study aims at better understanding the
infiltration process and hereupon improving the efficiency of the
infiltration management using Electrical Resistivity Tomography (ERT) in
combination with hydrological methods. We installed three permanent ERT
lines within one infiltration pond close to the city of Yavneh, south of
Tel Aviv. Each line comprises 96 electrodes, separated by 2 m in one
line and 0.5 m in the other two lines. The sediments below the pond are
mainly composed of sands and porous sandstone. In order to calibrate the
ERT results, water content, temperature, and electrical conductivity
were measured in-situ at different depths in shallow regions of the
pond, and cores from Geoprobe drillings were taken for lithological
analyses. Continuous ERT monitoring was conducted over two months
spanning infiltration scenarios characterized by different flooding
sequences. The averaged apparent resistivity data over time show a clear
response which can be related to the overall water content dynamics in
the vadose zone (over 30 m). The inverted ERT images indicate that the
infiltration is strongly affected by subsurface heterogeneity. With a
view to setting up a hydrological model, we analyzed the transient
behavior of the local drying curves after breakthrough of the
infiltration front for each pixel of the ERT image sequence. This
approach represents a new, "dynamic" method for subsurface hydraulic
zonation based on time-lapse ERT. Our study shows that ERT helps to
better understand the dynamics of water infiltration processes in the
context of SAT under real-world conditions, and by this may contribute
to enhancing the efficiency of SAT facilities.
KW - 0994 Instruments and techniques
KW - EXPLORATION GEOPHYSICS
KW - 1835 Hydrogeophysics
KW - HYDROLOGY
KW - 1855 Remote sensing
KW - 1880 Water management
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VL - 44
JO - Geophysical Research Abstracts
JF - Geophysical Research Abstracts
SN - 1029-7006
ER -