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Author  |
Lightfoot, D.R. |
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Title |
Moroccan khettara: Traditional irrigation and progressive desiccation |
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Journal Article |
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Year |
1996 |
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Geoforum |
Abbreviated Journal |
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Volume |
27 |
Issue |
2 |
Pages |
261-273 |
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Abstract |
A 300 km network of khettara (qanat) subsurface irrigation channels was excavated in the Tafilalt basin beginning in the late 14th century. More than 75 of these chains provided perennial water following the breakup of the ancient city of Sijilmassa. Khettara continued to function for much of the northern oasis until the early 1970s, when new technologies and government policies forced changes. Data on origins, maintenance, and current use were collected from archival sources, aerial photographs, Landsat imagery, and from interviews. Insufficient water resources and unsustainable practices have dramatically lowered the water table, drying up khettara. This has resulted in a loss of local control over water resources, abandonment of a sustainable irrigation system, and progressive desiccation. |
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0016-7185 |
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Call Number |
THL @ christoph.kuells @ Lightfoot1996261 |
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257 |
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Author |
Uhrie, J.L.; Drever, J.I.; Colberg, P.J.S.; Nesbitt, C.C. |
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Title |
In situ immobilization of heavy metals associated with uranium leach mines by bacterial sulfate reduction |
Type |
Journal Article |
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Year |
1996 |
Publication |
Hydrometallurgy |
Abbreviated Journal |
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Volume |
43 |
Issue |
1 |
Pages |
231-239 |
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Abstract |
Laboratory experiments with mixed populations of sulfate-reducing bactreria were shown to mediate the removal of milligrams/liter concentrations of uranium, selenium, arsenic and vanadium from aqueous solution via reduction, precipitation and adsorption. Results of laboratory experiments with active sulfidogenic biomass suggest that injection of sulfate and a source of carbon could enhance anaerobic microbial activity in and around uranium leach mines leading to in situ immobilization contaminating metals. |
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0304-386x |
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Call Number |
THL @ christoph.kuells @ uhrie_situ_1996 |
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197 |
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