{"id":413,"date":"2018-06-13T10:05:44","date_gmt":"2018-06-13T08:05:44","guid":{"rendered":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/?page_id=413"},"modified":"2019-04-28T17:34:41","modified_gmt":"2019-04-28T15:34:41","slug":"33-edification-de-la-dune-du-pyla","status":"publish","type":"page","link":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/33-edification-de-la-dune-du-pyla\/","title":{"rendered":"33 &#8211; Edification de la dune du Pyla"},"content":{"rendered":"<h6 style=\"text-align: center\"><span style=\"color: #000000\"><strong>&nbsp;L&#8217;ORIGINE DU SABLE<\/strong><\/span><\/h6>\n<table style=\"height: 69px\" width=\"100%\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" colspan=\"2\" width=\"241\"><a href=\"http:\/\/u.osmfr.org\/m\/227981\/\"><span style=\"color: #00ccff\"><strong>Coordonn\u00e9es g\u00e9ographiques et GPS du site<\/strong><\/span><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"121\"><span style=\"color: #000000\"><span style=\"color: #000000\">44\u00b035&#8217;23<\/span><\/span><span style=\"color: #000000\"><span style=\"color: #000000\">&#8216;<\/span><\/span><span style=\"color: #000000\">&#8216;N<\/span><\/td>\n<td style=\"text-align: center\" width=\"121\"><span style=\"color: #000000\"><span style=\"color: #000000\">1\u00b012&#8217;19<\/span><\/span><span style=\"color: #000000\"><span style=\"color: #000000\">&#8216;<\/span><\/span><span style=\"color: #000000\">&#8216;W<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"121\"><span style=\"color: #000000\">44.589722<\/span><\/td>\n<td style=\"text-align: center\" width=\"121\"><span style=\"color: #000000\">-1.205278<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_380\" aria-describedby=\"caption-attachment-380\" style=\"width: 343px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Carte.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-380\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Carte.png\" alt=\"\" width=\"343\" height=\"381\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Carte.png 343w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Carte-270x300.png 270w\" sizes=\"auto, (max-width: 343px) 100vw, 343px\" \/><\/a><figcaption id=\"caption-attachment-380\" class=\"wp-caption-text\">Carte de localisation de la dune du Pyla<\/figcaption><\/figure>\n<figure id=\"attachment_416\" aria-describedby=\"caption-attachment-416\" style=\"width: 570px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Panorama.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-416\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Panorama.png\" alt=\"\" width=\"570\" height=\"427\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Panorama.png 570w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Panorama-300x225.png 300w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/a><figcaption id=\"caption-attachment-416\" class=\"wp-caption-text\">Panorama _ Vue Sud<\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><strong><u>Description du site<\/u> :<\/strong><\/span><br \/>\n<span style=\"color: #000000\">La plus grande partie du mat\u00e9riau sableux provient de l\u2019accolement au rivage du Pilat, \u00e0 la fin du XIXe si\u00e8cle, d\u2019un banc comparable au Banc d\u2019Arguin actuel.<\/span><br \/>\n<span style=\"color: #000000\"><strong>Terminologie des Dunes<\/strong><\/span><\/p>\n<figure id=\"attachment_417\" aria-describedby=\"caption-attachment-417\" style=\"width: 525px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Carte-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-417\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Carte-1.png\" alt=\"\" width=\"525\" height=\"404\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Carte-1.png 525w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Carte-1-300x231.png 300w\" sizes=\"auto, (max-width: 525px) 100vw, 525px\" \/><\/a><figcaption id=\"caption-attachment-417\" class=\"wp-caption-text\">G\u00e9omorphologie des dunes<\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><strong>Les Barkanes <\/strong>sont des dunes d\u2019accumulation, \u00e9difi\u00e9es en terrain plat, mobiles, en forme de croissant dont la convexit\u00e9 est tourn\u00e9e au vent. Elles peuvent atteindre une taille de 300 m et s\u2019assembler pour former des formes complexes.<\/span><br \/>\n<span style=\"color: #000000\"><strong>Les dunes paraboliques <\/strong>sont des dunes de d\u00e9flation, peu mobiles, dont la forme se rapproche du U ou du V, et dont la convexit\u00e9 est tourn\u00e9e sous le vent. Leur taille varie de quelques d\u00e9cam\u00e8tres \u00e0 plus d\u2019un kilom\u00e8tre.<\/span><br \/>\n<span style=\"color: #000000\"><strong>Les dunes en \u00e9toiles <\/strong>aux clairi\u00e8res des for\u00eats de pins et seraient dues \u00e0 un d\u00e9s\u00e9quilibre dans le syst\u00e8me des vents, elles sont immobiles.<\/span><\/p>\n<p><span style=\"color: #000000\"><strong>La Dune du Pilat correspond \u00e0 une dune transversale, mobile, rectiligne, perpendiculaire \u00e0 la direction du vent.<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\"><strong>Disposition <\/strong><\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">domaine des dunes paraboliques, que l\u2019on trouve dans l\u2019actuel for\u00eat qui englobe aussi des dunes en \u00e9toiles&nbsp;<\/span><\/li>\n<li><span style=\"color: #000000\">domaine des barkhanes \u00e0 l\u2019est du domaine cit\u00e9 pr\u00e9c\u00e9demment<\/span><\/li>\n<li><span style=\"color: #000000\">domaine des grandes dunes \u00e0 l\u2019Est de la Dune du Pilat&nbsp;<\/span><\/li>\n<li><span style=\"color: #000000\">la dune transversale du Pilat&nbsp;<\/span><\/li>\n<\/ul>\n<figure id=\"attachment_418\" aria-describedby=\"caption-attachment-418\" style=\"width: 382px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Types-de-dunes.png\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-418\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Types-de-dunes.png\" alt=\"\" width=\"382\" height=\"211\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Types-de-dunes.png 422w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Types-de-dunes-300x166.png 300w\" sizes=\"auto, (max-width: 382px) 100vw, 382px\" \/><\/a><figcaption id=\"caption-attachment-418\" class=\"wp-caption-text\">Types de dunes<\/figcaption><\/figure>\n<figure id=\"attachment_419\" aria-describedby=\"caption-attachment-419\" style=\"width: 359px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Types-de-dunes-2.png\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-419\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Types-de-dunes-2.png\" alt=\"\" width=\"359\" height=\"266\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Types-de-dunes-2.png 408w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Types-de-dunes-2-300x222.png 300w\" sizes=\"auto, (max-width: 359px) 100vw, 359px\" \/><\/a><figcaption id=\"caption-attachment-419\" class=\"wp-caption-text\">Types de dunes_2<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000\"><strong>L\u2019accumulation de sable s\u2019est effectu\u00e9e de fa<\/strong><strong>\u00e7<\/strong><strong>on discontinue au fil du temps, selon&nbsp;5 phases&nbsp;durant les 4000 derni\u00e8res ann\u00e9es. Son histoire g\u00e9ologique est donc r\u00e9cente :<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\"><strong>1 <\/strong>&nbsp;De 8 000 \u00e0 2 000 ans avant notre \u00e8re, le plateau landais s\u2019\u00e9tendait \u00e0 l\u2019emplacement actuel de la grande dune. Des p\u00e9riodes caract\u00e9ris\u00e9es par un climat froid, sec, venteux ont entra\u00een\u00e9 le d\u00e9placement et l\u2019accumulation des sables.&nbsp;Des p\u00e9riodes plus chaudes et humides, propices au d\u00e9veloppement de la v\u00e9g\u00e9tation ont ponctu\u00e9 ces p\u00e9riodes froides.&nbsp;<\/span><\/p>\n<p><span style=\"color: #000000\">Des restes de v\u00e9g\u00e9tation sont visibles de la plage au sommet de la dune et correspondent aux&nbsp;pal\u00e9osols (voir<strong> <a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/33-dune-du-pyla\/\">33 &#8211; Dune du Pyla<\/a><\/strong>).&nbsp;<\/span><\/p>\n<p><span style=\"color: #000000\">Le pal\u00e9osol en bas de la Dune est sans relief compos\u00e9 de pins maritimes, et sylvestres. De nombreuses souches sont visibles et repose sur de l\u2019alios, couche noire compacte r\u00e9sultant de la cimentation naturelle du sable, d\u2019oxydes de fer et de mati\u00e8re organique :<\/span><\/p>\n<figure id=\"attachment_421\" aria-describedby=\"caption-attachment-421\" style=\"width: 449px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Vue-dune.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-421\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Vue-dune.png\" alt=\"\" width=\"449\" height=\"335\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Vue-dune.png 449w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Vue-dune-300x224.png 300w\" sizes=\"auto, (max-width: 449px) 100vw, 449px\" \/><\/a><figcaption id=\"caption-attachment-421\" class=\"wp-caption-text\">Pal\u00e9osol 1 _ Alios visible \u00e0 la base de la dune<\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><strong>2 &nbsp;<\/strong>A la pr\u00e9histoire plusieurs niveaux de sable se sont d\u00e9pos\u00e9s. Leur surface correspond au&nbsp;<a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/33-dune-du-pyla\/\"><strong>pal\u00e9osol 2<\/strong><\/a>, \u00e0 environ 3 m d\u2019altitude. Il renferme des restes de v\u00e9g\u00e9tation&nbsp;dat\u00e9s de 2 000 \u00e0 500 ans avant JC. Il vient fixer cette premi\u00e8re avanc\u00e9e sableuse. Ce sol ancien a \u00e9t\u00e9 occup\u00e9 par l\u2019homme au VII<sup>e<\/sup>&nbsp;si\u00e8cle avant JC. Les arch\u00e9ologues ont d\u00e9couvert un habitat du 1er Age du Fer.<\/span><\/p>\n<figure id=\"attachment_423\" aria-describedby=\"caption-attachment-423\" style=\"width: 985px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Coupe.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-423\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Coupe.png\" alt=\"\" width=\"985\" height=\"591\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Coupe.png 985w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Coupe-300x180.png 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Coupe-768x461.png 768w\" sizes=\"auto, (max-width: 985px) 100vw, 985px\" \/><\/a><figcaption id=\"caption-attachment-423\" class=\"wp-caption-text\">Coupe<\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><strong>Par la suite, trois g\u00e9n\u00e9rations de dunes se sont superpos\u00e9es :<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\"><strong>3 <\/strong>Des dunes anciennes paraboliques&nbsp;se sont form\u00e9es pendant la p\u00e9riode froide m\u00e9di\u00e9vale favorable aux vents de temp\u00eate, entre l\u2019an 500 et l\u2019an 1000. A la fin du Moyen-\u00e2ge, le climat se&nbsp;radoucit et devient plus humide, la v\u00e9g\u00e9tation se d\u00e9veloppe en Aquitaine.<\/span><\/p>\n<p><span style=\"color: #000000\">Les dunes anciennes sont recolonis\u00e9es par la for\u00eat entre l\u2019an 1000 et 1500. Ce niveau correspond au&nbsp;<a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/33-dune-du-pyla\/\"><strong>pal<\/strong><strong>\u00e9osol 3<\/strong><\/a>.<strong>&nbsp;<\/strong>&nbsp;Ce sol \u00e9pais de seulement quelques centim\u00e8tres, (voir photographies&nbsp;<strong><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/33-dune-du-pyla\/\">33 &#8211; Dune du Pyla<\/a><\/strong>) ondule \u00e0 mi-hauteur. Les bois qu\u2019il contient datent du XVI<sup>e<\/sup>&nbsp;si\u00e8cle. Lors des fouilles, il a livr\u00e9 des restes arch\u00e9ologiques de cette \u00e9poque&nbsp;: outils en silex, c\u00e9ramiques, pipes et pi\u00e8ces de monnaies.<\/span><\/p>\n<figure id=\"attachment_424\" aria-describedby=\"caption-attachment-424\" style=\"width: 383px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/De\u0301bris.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-424\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/De\u0301bris.png\" alt=\"\" width=\"383\" height=\"575\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/De\u0301bris.png 383w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/De\u0301bris-200x300.png 200w\" sizes=\"auto, (max-width: 383px) 100vw, 383px\" \/><\/a><figcaption id=\"caption-attachment-424\" class=\"wp-caption-text\">D\u00e9bris<\/figcaption><\/figure>\n<p><strong>4&nbsp;<\/strong>\u00c0 partir de 1500, le climat change. Des vents puissants vont cr\u00e9er une nouvelle s\u00e9rie de dunes appel\u00e9es \u00ab&nbsp;<strong>dunes modernes<\/strong>&nbsp;\u00bb ou&nbsp;<strong>de type barkhanes<\/strong>. Les dunes&nbsp;anciennes sont recouvertes \u00e9galement les villages et les cultures. Les hommes fixent les dunes alors par semis de pins maritimes en application d\u2019un d\u00e9cret consulaire de 1801, sign\u00e9 de Napol\u00e9on Bonaparte. Ces travaux sont supervis\u00e9s par Nicolas Br\u00e9montier, Ing\u00e9nieur des Ponts et Chauss\u00e9es.<\/p>\n<p>La&nbsp;<strong>dune de la Grave<\/strong>, occupant alors l\u2019emplacement actuel de la dune du Pilat, est ainsi&nbsp;stabilis\u00e9e au d\u00e9but du XIX<sup>e<\/sup>&nbsp;si\u00e8cle. Le pal\u00e9osol le plus haut (<a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/33-dune-du-pyla\/\"><strong>pal\u00e9<\/strong><strong>osol 4<\/strong><\/a>), correspond \u00e0 sa surface. Une for\u00eat cultiv\u00e9e de pins s\u2019\u00e9tendait l\u00e0 \u00e0 cette \u00e9poque. Des pots servant \u00e0 la r\u00e9colte de la r\u00e9sine y ont \u00e9t\u00e9 retrouv\u00e9s.<\/p>\n<p><strong>5&nbsp;<\/strong>Sous l\u2019effet de l\u2019\u00e9rosion, la dune de la Grave s\u2019est remise en mouvement vers 1860 pour donner naissance \u00e0 l\u2019actuelle&nbsp;<strong>dune du Pilat<\/strong>.<\/p>\n<figure id=\"attachment_426\" aria-describedby=\"caption-attachment-426\" style=\"width: 1004px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Mouvement-dune-de-la-Grave.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-426\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Mouvement-dune-de-la-Grave.png\" alt=\"\" width=\"1004\" height=\"237\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Mouvement-dune-de-la-Grave.png 1004w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Mouvement-dune-de-la-Grave-300x71.png 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Mouvement-dune-de-la-Grave-768x181.png 768w\" sizes=\"auto, (max-width: 1004px) 100vw, 1004px\" \/><\/a><figcaption id=\"caption-attachment-426\" class=\"wp-caption-text\">Mouvements de la dune de la Grave<\/figcaption><\/figure>\n<figure id=\"attachment_427\" aria-describedby=\"caption-attachment-427\" style=\"width: 1004px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Transport.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-427\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Transport.png\" alt=\"\" width=\"1004\" height=\"489\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Transport.png 1004w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Transport-300x146.png 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Transport-768x374.png 768w\" sizes=\"auto, (max-width: 1004px) 100vw, 1004px\" \/><\/a><figcaption id=\"caption-attachment-427\" class=\"wp-caption-text\">Modes de transport des grains de sable<\/figcaption><\/figure>\n<figure id=\"attachment_428\" aria-describedby=\"caption-attachment-428\" style=\"width: 631px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Diagrammes.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-428\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Diagrammes.png\" alt=\"\" width=\"631\" height=\"789\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Diagrammes.png 631w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/06\/Diagrammes-240x300.png 240w\" sizes=\"auto, (max-width: 631px) 100vw, 631px\" \/><\/a><figcaption id=\"caption-attachment-428\" class=\"wp-caption-text\">Bloc diagramme de l&#8217;\u00e9dification de la dune du Pyla<\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><strong><u>Activit\u00e9s envisageables<\/u> :<\/strong><\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">Etude du transport \u00e9olien&nbsp;<\/span><span style=\"color: #000000\">par les vents depuis les plages situ\u00e9es au Sud de la Dune.<\/span><\/li>\n<li><span style=\"color: #000000\">Etude du transport par l\u2019eau<\/span><\/li>\n<\/ul>\n<p><strong style=\"color: #000000\"><u>Acc\u00e8s \/ s\u00e9curit\u00e9<\/u>&nbsp;:<\/strong><\/p>\n<p><span style=\"color: #000000\">Parking de la Dune du Pyla (payant) ou en redescendant vers Arcachon, au rond point,&nbsp; un d\u00e9croch\u00e9 \u00e0 gauche permet de faire un arr\u00eat.<\/span><\/p>\n<p><span style=\"color: #000000\"><strong><u>Mots-cl\u00e9s et liens avec les programmes<\/u>&nbsp;:<\/strong><\/span><\/p>\n<table style=\"height: 206px\" width=\"921\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" colspan=\"2\" width=\"321\"><span style=\"color: #000000\"><strong>Coll\u00e8ge<\/strong><\/span><\/td>\n<td style=\"text-align: center\" colspan=\"2\" width=\"321\"><span style=\"color: #000000\"><strong>Lyc\u00e9e<\/strong><\/span><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"66\"><span style=\"color: #000000\"><strong>Cycle 3<\/strong><\/span><\/td>\n<td rowspan=\"2\" width=\"255\"><span style=\"color: #000000\">Identifier les composants biologiques et g\u00e9ologiques d\u2019un paysage &#8211; Paysages, g\u00e9ologie locale, interactions avec l\u2019environnement et le peuplement.<\/span><\/td>\n<td width=\"57\"><span style=\"color: #000000\"><strong>2nde<\/strong><\/span><\/td>\n<td width=\"264\"><span style=\"color: #000000\">Th\u00e8me 2 \u2013 Le sol \u2013 Les changements climatiques pass\u00e9s (temps g\u00e9ologiques) et actuels (influence des activit\u00e9s humaines sur le climat)<\/span><\/td>\n<\/tr>\n<tr>\n<td width=\"57\"><span style=\"color: #000000\"><strong>TS<\/strong><\/span><\/td>\n<td width=\"264\"><span style=\"color: #000000\">Th\u00e8me 1B4 \u2013 \u00c9rosion et disparition des reliefs<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp;L&#8217;ORIGINE DU SABLE Coordonn\u00e9es g\u00e9ographiques et GPS du site 44\u00b035&#8217;23&#8216;&#8216;N 1\u00b012&#8217;19&#8216;&#8216;W 44.589722 -1.205278 Description du site : La plus grande partie du mat\u00e9riau sableux provient de l\u2019accolement au rivage du &#8230;<\/p>\n","protected":false},"author":8,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-left-sidebar.php","meta":{"footnotes":""},"class_list":["post-413","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/comments?post=413"}],"version-history":[{"count":12,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/413\/revisions"}],"predecessor-version":[{"id":1098,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/413\/revisions\/1098"}],"wp:attachment":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/media?parent=413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}