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| Titel |
Prediction of chloride leaching from a non-irrigated, de-watered saline soil using the MACRO model |
| VerfasserIn |
P. L. Bourgault du Coudray, D. R. Williamson, W. D. Scott |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 1, no. 4 ; Nr. 1, no. 4, S.845-851 |
| Datensatznummer |
250000239
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| Publikation (Nr.) |
 copernicus.org/hess-1-845-1997.pdf |
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| Zusammenfassung |
| A pedon scale study was conducted to investigate the
degree of chloride leaching from a de-watered saline soil profile in the
non-irrigated wheatbelt region of south-western Australia. Within the surface 250mm of the soil profile was a dispersed layer
acting as a hydraulic throttle. Soil water tensions and chloride concentrations were obtained over
a two-year period over depths ranging from 0.2m to 1.5m. In the first year the soil surface
remained untouched. In the second year, the throttle layer was fractured by ripping to a depth
of 250mm. Rainfall, runoff and potential evaporation were also measured at the site. These data
were used to calibrate and run the MACRO solute transport model using three surface treatment
management scenarios: I. the soil surface remains unchanged (`Do nothing'); II. the soil surface
is continually ripped; III. the soil surface is ripped followed by surface scaling. The time period
required, effectively, to leach the chloride from the profile, to a depth of 1.5m, was predicted.
Effective leaching would take at least 400 years and possibly in excess of 200,000 years for
Treatment I, 5 years for Treatment II and 90 years for Treatment III. Macropores that were observed
within the sub-surface soil profile played no significant role in the leaching
of the chloride. However, the rip fractures were treated as macropores by the MACRO model and as such
allowed greater infiltration of water that resulted in the mobilisation of chloride
within the rest of the soil profile. |
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