{"id":615,"date":"2013-12-30T07:58:33","date_gmt":"2013-12-30T06:58:33","guid":{"rendered":"https:\/\/asal.dz\/?p=615"},"modified":"2018-12-24T09:59:03","modified_gmt":"2018-12-24T08:59:03","slug":"analyse-geomorphologique-des-dunes-de-lerg-iguidi-sud-ouest-algerien-a-partir-des-images-du-satellite-alsat-2a","status":"publish","type":"post","link":"https:\/\/asal.dz\/?p=615","title":{"rendered":"Analyse g\u00e9omorphologique des dunes de l\u2019Erg Iguidi (Sud Ouest Alg\u00e9rien) \u00e0 partir des images du satellite Alsat-2A"},"content":{"rendered":"<table border=\"0\" width=\"699\">\n<tbody>\n<tr>\n<td height=\"175\"><\/td>\n<td colspan=\"5\" rowspan=\"5\" align=\"left\" valign=\"top\">\n<p class=\"Style112\" align=\"center\">Analyse g\u00e9omorphologique des dunes de l\u2019Erg Iguidi (Sud Ouest Alg\u00e9rien) \u00e0 partir des images du satellite Alsat-2A<\/p>\n<p class=\"Style120\" align=\"center\">\n<p class=\"style115\" align=\"justify\">Situation g\u00e9ographique de l\u2019Erg Iguidi<\/p>\n<p class=\"Style98\" align=\"justify\">L\u2019Erg Iguidi est situ\u00e9 dans la plateforme Saharienne \u00e0 plus de 300 Kms \u00e0 l\u2019Est de la ville de Tindouf, \u00e0 150 Kms au Nord de Chenachen. Il est entour\u00e9 par les plateaux rocheux, Hamada \u00a0Safra au Sud et Hamada Tounassine au Nord.<\/p>\n<p class=\"Style98\" align=\"justify\">Cette zone d\u00e9sertique subi une forte \u00e9rosion provenant essentiellement du vent et des variations de\u00a0 temp\u00e9rature (thermoclastie).<\/p>\n<p class=\"Style98\" align=\"justify\"><strong>Analyse G\u00e9omorphologie des dunes \u00e0 partir des images Alsat-2A<\/strong><\/p>\n<p class=\"Style98\" align=\"justify\">L\u2019Erg Iguidi est compos\u00e9 de dunes en \u00e9toiles, de forme pyramidale et appel\u00e9es \u00ab\u00a0<span class=\"Style121\">Ghourds\u00a0<\/span>\u00bb. Ces derni\u00e8res se forment dans les r\u00e9gions connaissant des vents multidirectionnels. Ces dunes qui sont sculpt\u00e9es en \u00e9toile par les vents, grandissent plus vers le haut que lat\u00e9ralement. Elles peuvent atteindre des centaines\u00a0 de m\u00e8tres\u00a0 de haut.<\/p>\n<p class=\"Style98\" align=\"justify\">L\u2019analyse des images Alsat-2A, prises le 03\/12\/2013 et couvrant la partie m\u00e9ridionale de l\u2019Erg d\u2019Iguidi, montre l\u2019existence de cette forme en \u00e9toile des dunes, atteignant des hauteurs importantes. Ces hauteurs sont mises en \u00e9vidence par l\u2019importance de la surface occup\u00e9e par les ombres port\u00e9es des cr\u00eates (Siouf) de ces dunes.<\/p>\n<p class=\"Style98\" align=\"justify\">Il est \u00e0 noter, la pr\u00e9sence de dunes \u00ab\u00a0\u00e9toil\u00e9es\u00a0\u00bb \u00e0 plus de 04 branches non sym\u00e9triques, indiquant\u00a0 une l\u00e9g\u00e8re dominance de l\u2019une des directions fr\u00e9quentes des vents qui affectent l\u2019Erg.<\/p>\n<p class=\"Style98\" align=\"justify\">Enfin, il est \u00e0 signaler la pr\u00e9sence dans les espaces s\u00e9parant ces \u00e9difices dunaires, de cro\u00fbtes blanch\u00e2tres li\u00e9es \u00e0 la pr\u00e9sence de formation \u00e0 dominance gypseuse.<\/p>\n<p class=\"Style98\" align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.asal.dz\/pictures\/morpho1.JPG\" width=\"680\" height=\"446\" border=\"1\" \/><\/p>\n<p class=\"Style98\" align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.asal.dz\/pictures\/morpho2.JPG\" width=\"465\" height=\"530\" border=\"1\" \/><\/p>\n<p class=\"Style98\" align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.asal.dz\/pictures\/morpho3.JPG\" width=\"680\" height=\"442\" border=\"1\" \/><\/p>\n<p class=\"Style98\" align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.asal.dz\/pictures\/morpho4.JPG\" width=\"680\" height=\"425\" border=\"1\" \/><\/p>\n<p class=\"Style98\" align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.asal.dz\/pictures\/morpho5.JPG\" width=\"680\" height=\"530\" border=\"1\" \/><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td height=\"62\"><\/td>\n<\/tr>\n<tr>\n<td height=\"21\"><\/td>\n<\/tr>\n<tr>\n<td height=\"21\"><\/td>\n<\/tr>\n<tr>\n<td height=\"2710\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Analyse g\u00e9omorphologique des dunes de l\u2019Erg Iguidi (Sud Ouest Alg\u00e9rien) \u00e0 partir des images du satellite Alsat-2A Situation g\u00e9ographique de l\u2019Erg Iguidi L\u2019Erg Iguidi est situ\u00e9 dans la plateforme Saharienne \u00e0 plus de 300 Kms \u00e0 l\u2019Est de la ville de Tindouf, \u00e0 150 Kms au Nord de Chenachen. Il est entour\u00e9 par les plateaux [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","footnotes":""},"categories":[3],"tags":[],"class_list":["post-615","post","type-post","status-publish","format-standard","hentry","category-actualites"],"_links":{"self":[{"href":"https:\/\/asal.dz\/index.php?rest_route=\/wp\/v2\/posts\/615","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/asal.dz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/asal.dz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/asal.dz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/asal.dz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=615"}],"version-history":[{"count":0,"href":"https:\/\/asal.dz\/index.php?rest_route=\/wp\/v2\/posts\/615\/revisions"}],"wp:attachment":[{"href":"https:\/\/asal.dz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=615"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/asal.dz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=615"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/asal.dz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=615"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}