Suffosion et érosion hydrique en milieux semi-arides, le cas des Hautes Steppes tunisiennes (Tunisie centrale)
Hydric erosion is very active in the Upper Steppes area of Tunisia chiefly on the alluvial floodplains where it is largely controlled by suffusion. This erosive dynamic represents a threat for the agricultural lands. The erosive phenomena related to suffusion, causes gullying, banks undermining and...
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| Format: | Article |
| Language: | English |
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Physio-Géo
2012-02-01
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| Series: | Physio-Géo |
| Subjects: | |
| Online Access: | https://journals.openedition.org/physio-geo/2246 |
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| Summary: | Hydric erosion is very active in the Upper Steppes area of Tunisia chiefly on the alluvial floodplains where it is largely controlled by suffusion. This erosive dynamic represents a threat for the agricultural lands. The erosive phenomena related to suffusion, causes gullying, banks undermining and enlargement of the section of wadis. A morphodynamic mapping based on field-observations, the exploitation of aerial photos multi-date data, and the study of some examples put moreover in evidence the sensibility of the area to erosion phenomena in relation with suffusion. The forms of gullying and a comparative study of orthorectified air photographs pose the problem of the factors of this accelerated evolution: rainfall aggressivity, soil erodibility, inclination of the slopes, weakness of the vegetal cover and inappropriate human activities. |
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| ISSN: | 1958-573X |