Caractérisation morphologique des cuvettes oasiennes du Centre-Est du Niger
Located in semi-arid to arid areas of Niger, the oasis basins of the Department of Gouré are currently threatened with silting due to the degradation of vegetation cover and the increased efficiency of erosive winds. To understand the silting up process around these basins, characterization of their...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Physio-Géo
2017-12-01
|
| Series: | Physio-Géo |
| Subjects: | |
| Online Access: | https://journals.openedition.org/physio-geo/5607 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850124202519035904 |
|---|---|
| author | Mahamadou Karimou Barké Issa Oussein Charles Bielders Karimou J.M. Ambouta Bernard Tychon |
| author_facet | Mahamadou Karimou Barké Issa Oussein Charles Bielders Karimou J.M. Ambouta Bernard Tychon |
| author_sort | Mahamadou Karimou Barké |
| collection | DOAJ |
| description | Located in semi-arid to arid areas of Niger, the oasis basins of the Department of Gouré are currently threatened with silting due to the degradation of vegetation cover and the increased efficiency of erosive winds. To understand the silting up process around these basins, characterization of their shapes and orientations was undertaken. The compactness coefficient of GRAVELIUS helped highlight circular basins (8,5 %), ovoid (46,8 %), amoeboid (10,9 %), stretched (17,6 %) and very stretched with amoeboid tendency (16,1 %). Circular or ovoid shape of oasis basins refer to the drains that are partially filled with wind. The stretched and very stretched shapes are linked to the hydrographic network fragmentation by dunes edifices. Finally, the measurement of the orientation allowed to assess the distribution between four major sectors: E-W (22,8 %), N-S (21,4 %) NE-SW (21,6 %) and SE-NW (34,3 %). The oasis basins oriented E-W and NE-SW are associated with longitudinal dunes and oriented N-S and SE-NW with transverse dunes. |
| format | Article |
| id | doaj-art-5143ae2a4f8f4e828e117b0d509c42e6 |
| institution | OA Journals |
| issn | 1958-573X |
| language | English |
| publishDate | 2017-12-01 |
| publisher | Physio-Géo |
| record_format | Article |
| series | Physio-Géo |
| spelling | doaj-art-5143ae2a4f8f4e828e117b0d509c42e62025-08-20T02:34:24ZengPhysio-GéoPhysio-Géo1958-573X2017-12-011125527610.4000/physio-geo.5607Caractérisation morphologique des cuvettes oasiennes du Centre-Est du NigerMahamadou Karimou BarkéIssa OusseinCharles BieldersKarimou J.M. AmboutaBernard TychonLocated in semi-arid to arid areas of Niger, the oasis basins of the Department of Gouré are currently threatened with silting due to the degradation of vegetation cover and the increased efficiency of erosive winds. To understand the silting up process around these basins, characterization of their shapes and orientations was undertaken. The compactness coefficient of GRAVELIUS helped highlight circular basins (8,5 %), ovoid (46,8 %), amoeboid (10,9 %), stretched (17,6 %) and very stretched with amoeboid tendency (16,1 %). Circular or ovoid shape of oasis basins refer to the drains that are partially filled with wind. The stretched and very stretched shapes are linked to the hydrographic network fragmentation by dunes edifices. Finally, the measurement of the orientation allowed to assess the distribution between four major sectors: E-W (22,8 %), N-S (21,4 %) NE-SW (21,6 %) and SE-NW (34,3 %). The oasis basins oriented E-W and NE-SW are associated with longitudinal dunes and oriented N-S and SE-NW with transverse dunes.https://journals.openedition.org/physio-geo/5607oasian basinsshape indexGraveliusorientationGouréNiger |
| spellingShingle | Mahamadou Karimou Barké Issa Oussein Charles Bielders Karimou J.M. Ambouta Bernard Tychon Caractérisation morphologique des cuvettes oasiennes du Centre-Est du Niger Physio-Géo oasian basins shape index Gravelius orientation Gouré Niger |
| title | Caractérisation morphologique des cuvettes oasiennes du Centre-Est du Niger |
| title_full | Caractérisation morphologique des cuvettes oasiennes du Centre-Est du Niger |
| title_fullStr | Caractérisation morphologique des cuvettes oasiennes du Centre-Est du Niger |
| title_full_unstemmed | Caractérisation morphologique des cuvettes oasiennes du Centre-Est du Niger |
| title_short | Caractérisation morphologique des cuvettes oasiennes du Centre-Est du Niger |
| title_sort | caracterisation morphologique des cuvettes oasiennes du centre est du niger |
| topic | oasian basins shape index Gravelius orientation Gouré Niger |
| url | https://journals.openedition.org/physio-geo/5607 |
| work_keys_str_mv | AT mahamadoukarimoubarke caracterisationmorphologiquedescuvettesoasiennesducentreestduniger AT issaoussein caracterisationmorphologiquedescuvettesoasiennesducentreestduniger AT charlesbielders caracterisationmorphologiquedescuvettesoasiennesducentreestduniger AT karimoujmambouta caracterisationmorphologiquedescuvettesoasiennesducentreestduniger AT bernardtychon caracterisationmorphologiquedescuvettesoasiennesducentreestduniger |