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Artificial Recharge of Humic Ground Water

DHI Water & Environment, Agern Allé 11, DK-2970 Hørsholm, Denmark

View larger version (84K): [in a new window]   Fig. 1. Geological cross-section of the study site. MBS, meters below surface

View larger version (18K): [in a new window]   Fig. 2. Top view of the study site. A and B show the locations where the sieve analyses were carried out. OB1 through OB10 indicate observation wells outside the infiltration field. OBI1 through OBI4 refer to observation wells inside the infiltration field. S1 through S3 show sampling points upgradient, under the infiltration field, and downgradient, respectively. A,B,C designates the place where the cup sampled pore waters were collected during the sampling. B1, B3, B4, B5, and B6 are the locations where soil samples were taken

View larger version (19K): [in a new window]   Fig. 4. Gamma logging data for the study site. Values greater than 700 counts per minute (CPM) correlate to low permeable clay and silt layers. SWD2 refers to the 7.5-m-deep well at the S2 sampling point under the infiltration field. MBS, meters below surface

View larger version (25K): [in a new window]   Fig. 3. Equipotential lines for the shallow ground water table (a) before and (b) after the artificial recharge experiment. Data are in meters above an arbitrary datum

View larger version (20K): [in a new window]   Fig. 5. Ground water composition at 5 and 7.5 m under the infiltration field and irrigation and precipitation rates in millimeters per day from Day 1 to Day 239. NPOC, non-purgeable organic carbon; MBS, meters below surface; EC, electrical conductivity

View larger version (19K): [in a new window]   Fig. 6. Average composition of the polytetrafluoroethylene (PTFE) cup sampled pore water in the C horizon (1.00–1.15 m) under the infiltration field. NPOC, non-purgeable organic carbon; EC, electrical conductivity

View larger version (20K): [in a new window]   Fig. 7. Average composition of the pore waters centrifuged from the soil samples taken from three hand auger borings inside (B1, B3, and B6; left) and two outside (B4 and B5; right) the infiltration field. NPOC, non-purgeable organic carbon; MBS, meters below surface; EC, electrical conductivity

View larger version (13K): [in a new window]   Fig. 8. A comparison between the sedimentary organic carbon (OC) of the soil samples measured as acid desorbable organic carbon (ADOC) and given as percent dry weight of the original sample. The soil samples were taken from the unsaturated zone inside (B1 and B3) and outside (B4) the infiltration field from 0.45 to 3.5 meters below surface (MBS)