{"id":167,"date":"2018-05-03T19:02:18","date_gmt":"2018-05-03T17:02:18","guid":{"rendered":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/?page_id=167"},"modified":"2019-04-28T17:35:25","modified_gmt":"2019-04-28T15:35:25","slug":"les-digues-situees-le-long-de-la-garonne-a-agen-et-au-passage-dagen","status":"publish","type":"page","link":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/les-digues-situees-le-long-de-la-garonne-a-agen-et-au-passage-dagen\/","title":{"rendered":"47 &#8211; Les digues situ\u00e9es le long de la Garonne \u00e0 Agen et au passage d\u2019Agen"},"content":{"rendered":"<table style=\"height: 84px\" width=\"100%\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" colspan=\"2\" width=\"412\"><span style=\"color: #00ccff\"><a style=\"color: #00ccff\" href=\"http:\/\/u.osmfr.org\/m\/227985\/\"><strong>Coordonn\u00e9es g\u00e9ographiques et GPS du parking<\/strong><\/a><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"206\"><span style=\"color: #000000\">44.202252<\/span><\/td>\n<td style=\"text-align: center\" width=\"206\"><span style=\"color: #000000\">0.606438<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"color: #000000\"><strong><u>Description du site<\/u> :<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">\u00c0 hauteur des villes d\u2019Agen et du Passage d\u2019Agen, la Garonne est ceintur\u00e9e de digues qui ont \u00e9t\u00e9 r\u00e9alis\u00e9es en plusieurs \u00e9tapes&nbsp;:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">En 1993\/1994&nbsp;: Construction de la digue en terre entre le pont de pierre et le pont-canal, rive gauche (Le Passage d\u2019Agen)&nbsp;;<\/span><\/li>\n<li><span style=\"color: #000000\">En 1994\/1996&nbsp;: Construction de la digue ma\u00e7onn\u00e9e et de la voie sur berge au niveau du quartier des \u00eeles et Gravier, rive droite (Agen)&nbsp;;<\/span><\/li>\n<li><span style=\"color: #000000\">En 1998\/1999&nbsp;: Construction de la digue ma\u00e7onn\u00e9e au niveau du Passage d\u2019Agen. Elle mesure 460m de long, 5 m\u00e8tres de haut, 50 cm d\u2019\u00e9paisseur et pr\u00e9sente un \u00e9cran \u00e9tanche jusqu\u2019\u00e0 5 m\u00e8tres de profondeur, permettant de limiter une crue par une remont\u00e9e de la nappe phr\u00e9atique.<\/span><\/li>\n<\/ul>\n<figure id=\"attachment_169\" aria-describedby=\"caption-attachment-169\" style=\"width: 1087px\" class=\"wp-caption alignleft\"><a style=\"color: #000000\" href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Gravier.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-169\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Gravier.png\" alt=\"\" width=\"1087\" height=\"725\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Gravier.png 1087w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Gravier-300x200.png 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Gravier-768x512.png 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Gravier-1024x683.png 1024w\" sizes=\"auto, (max-width: 1087px) 100vw, 1087px\" \/><\/a><figcaption id=\"caption-attachment-169\" class=\"wp-caption-text\"><span style=\"color: #000000\">Digue et voie sur berge le long du Gravier (Agen) vues depuis la passerelle<\/span><\/figcaption><\/figure>\n<figure id=\"attachment_170\" aria-describedby=\"caption-attachment-170\" style=\"width: 1087px\" class=\"wp-caption alignleft\"><a style=\"color: #000000\" href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Iles.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-170\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Iles.png\" alt=\"\" width=\"1087\" height=\"725\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Iles.png 1087w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Iles-300x200.png 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Iles-768x512.png 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Iles-1024x683.png 1024w\" sizes=\"auto, (max-width: 1087px) 100vw, 1087px\" \/><\/a><figcaption id=\"caption-attachment-170\" class=\"wp-caption-text\"><span style=\"color: #000000\">Digue et voie sur berge le long du quartier des \u00eeles (Agen) vues depuis la passerelle<\/span><\/figcaption><\/figure>\n<figure id=\"attachment_171\" aria-describedby=\"caption-attachment-171\" style=\"width: 1087px\" class=\"wp-caption alignleft\"><a style=\"color: #000000\" href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Terre-ma\u00e7onn\u00e9e.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-171\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Terre-ma\u00e7onn\u00e9e.png\" alt=\"\" width=\"1087\" height=\"725\"><\/a><figcaption id=\"caption-attachment-171\" class=\"wp-caption-text\"><span style=\"color: #000000\">Digue en terre et digue ma\u00e7onn\u00e9e c\u00f4t\u00e9 Passage d\u2019Agen vues depuis la passerelle<\/span><\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000\">De part et d\u2019autre de la Garonne, au pied de la passerelle reliant le Passage d\u2019Agen \u00e0 Agen, des rep\u00e8res de crues associ\u00e9es \u00e0 une \u00e9chelle limnim\u00e9trique permettent de rendre compte de l\u2019efficacit\u00e9 limit\u00e9e des digues construites, la hauteur de la digue, inf\u00e9rieure au niveau d\u2019eau atteint lors des crues de 1930 (10,86m) et 1952 (10,38m), montre que l\u2019existence des digues ne fait que r\u00e9duire le risque d\u2019inondation sans l\u2019annuler compl\u00e8tement. Elles se r\u00e9v\u00e8lent efficaces contre les crues d\u00e9cennales et cinquantennales mais inefficaces contre les crues centenalles.<\/span><\/p>\n<table style=\"height: 333px\" width=\"810\">\n<tbody>\n<tr>\n<td width=\"113\"><span style=\"color: #000000\">Date<\/span><\/td>\n<td width=\"113\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">C\u00f4te atteinte (\u00e9chelle d\u2019Agen)<\/span><\/p>\n<\/td>\n<td style=\"text-align: center\" width=\"161\"><span style=\"color: #000000\">D\u00e9bit enregistr\u00e9<\/span><\/td>\n<td width=\"123\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">P\u00e9riode de retour<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"113\"><span style=\"color: #000000\">Avril 1712<\/span><\/td>\n<td width=\"113\"><span style=\"color: #000000\">10,89 m<\/span><\/td>\n<td width=\"161\"><span style=\"color: #000000\">&#8211;<\/span><\/td>\n<td width=\"123\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">100 ans<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"113\"><span style=\"color: #000000\">Avril 1770<\/span><\/td>\n<td width=\"113\"><span style=\"color: #000000\">10,89 m<\/span><\/td>\n<td width=\"161\"><span style=\"color: #000000\">&#8211;<\/span><\/td>\n<td width=\"123\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">100 ans<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"113\"><span style=\"color: #000000\">Juin 1875<\/span><\/td>\n<td width=\"113\"><span style=\"color: #000000\">11,70 m<\/span><\/td>\n<td width=\"161\"><span style=\"color: #000000\">Entre 8500 et 9300m<sup>3<\/sup>\/s<\/span><\/td>\n<td width=\"123\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">300 \u00e0 500 ans<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"113\"><span style=\"color: #000000\">F\u00e9vrier 1879<\/span><\/td>\n<td width=\"113\"><span style=\"color: #000000\">10,20 m<\/span><\/td>\n<td width=\"161\"><span style=\"color: #000000\">&#8211;<\/span><\/td>\n<td width=\"123\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">100 ans<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"113\"><span style=\"color: #000000\">Mars 1930<\/span><\/td>\n<td width=\"113\"><span style=\"color: #000000\">10,86 m<\/span><\/td>\n<td width=\"161\"><span style=\"color: #000000\">7850 m<sup>3<\/sup>\/s<\/span><\/td>\n<td width=\"123\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">100 ans<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"113\"><span style=\"color: #000000\">F\u00e9vrier 1952<\/span><\/td>\n<td width=\"113\"><span style=\"color: #000000\">10,38 m<\/span><\/td>\n<td width=\"161\"><span style=\"color: #000000\">7000 m<sup>3<\/sup>\/s<\/span><\/td>\n<td width=\"123\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">50 ans<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"113\"><span style=\"color: #000000\">D\u00e9cembre 1981<\/span><\/td>\n<td width=\"113\"><span style=\"color: #000000\">8,50 m<\/span><\/td>\n<td width=\"161\"><span style=\"color: #000000\">4850 m<sup>3<\/sup>\/s<\/span><\/td>\n<td width=\"123\">\n<p style=\"text-align: center\"><span style=\"color: #000000\">10 ans<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"color: #000000\"><u>Les crues majeures enregistr\u00e9es \u00e0 Agen depuis 1712<\/u><\/span><\/p>\n<p><span style=\"color: #000000\"><em>d\u2019apr\u00e8s le document d\u2019information communal sur les risques majeurs de la ville d\u2019Agen (DICRIM &#8211; 2014)<\/em><\/span><\/p>\n<p><span style=\"color: #000000\">La simple travers\u00e9e de la passerelle permet une comparaison des digues dispos\u00e9es de part et d\u2019autre de la Garonne. On remarque que la digue situ\u00e9e du c\u00f4t\u00e9 d\u2019Agen est moins haute que celle construite du c\u00f4t\u00e9 Passage d\u2019Agen. Cette diff\u00e9rence tient aux diff\u00e9rences de surface au sol disponible au moment de leur construction, un ouvrage \u00e9tant n\u00e9cessairement d\u2019autant plus large \u00e0 sa base qu\u2019il est haut.<\/span><\/p>\n<figure id=\"attachment_172\" aria-describedby=\"caption-attachment-172\" style=\"width: 814px\" class=\"wp-caption alignleft\"><a style=\"color: #000000\" href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Rep\u00e8res.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-172\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Rep\u00e8res.png\" alt=\"\" width=\"814\" height=\"881\"><\/a><figcaption id=\"caption-attachment-172\" class=\"wp-caption-text\"><span style=\"color: #000000\">Rep\u00e8res de crues (1930 et 1952) et \u00e9chelle limnim\u00e9trique du c\u00f4t\u00e9 passage d\u2019Agen (rive gauche)<\/span><\/figcaption><\/figure>\n<figure id=\"attachment_173\" aria-describedby=\"caption-attachment-173\" style=\"width: 1089px\" class=\"wp-caption alignleft\"><a style=\"color: #000000\" href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Rep\u00e8res2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-173\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Rep\u00e8res2.png\" alt=\"\" width=\"1089\" height=\"899\"><\/a><figcaption id=\"caption-attachment-173\" class=\"wp-caption-text\"><span style=\"color: #000000\">Rep\u00e8res de crues (1930 et 1952) et \u00e9chelle limnim\u00e9trique du c\u00f4t\u00e9 Agen (rive droite)<\/span><\/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\">Mesurer et comparer la hauteur des digues par rapport aux \u00e9chelles limnim\u00e9triques et aux crues rep\u00e9r\u00e9es.<\/span><\/li>\n<li><span style=\"color: #000000\">R\u00e9aliser une coupe sch\u00e9matique de la Garonne et des am\u00e9nagements situ\u00e9s sur ses bordures.<\/span><\/li>\n<li><span style=\"color: #000000\">Identifier et d\u00e9battre des contraintes ayant orient\u00e9 les choix d\u2019am\u00e9nagement (co\u00fbt, espace disponible, besoin de protection, d\u2019am\u00e9lioration des conditions de circulation\u2026)<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000\"><strong><u>Acc\u00e8s \/ s\u00e9curit\u00e9<\/u>&nbsp;:<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">Au pont de pierre (D856), c\u00f4t\u00e9 Passage d\u2019Agen, suivre Le Passage Centre, via l\u2019avenue d\u2019Alsace puis la rue de la Garonne, une fois devant les locaux d\u2019Enedis, tourner \u00e0 droite puis emprunter la voie sur berge en revenant vers le pont de pierre. Stationner sur les places situ\u00e9es au pied de la passerelle.<\/span><\/p>\n<figure id=\"attachment_168\" aria-describedby=\"caption-attachment-168\" style=\"width: 810px\" class=\"wp-caption alignleft\"><a style=\"color: #000000\" href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Digues_Acc\u00e8s.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-168\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/05\/Digues_Acc\u00e8s.png\" alt=\"\" width=\"810\" height=\"824\"><\/a><figcaption id=\"caption-attachment-168\" class=\"wp-caption-text\"><span style=\"color: #000000\">Digues_Acc\u00e8s<\/span><\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><strong><u>Mots-cl\u00e9s et liens avec les programmes<\/u>&nbsp;:<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">Al\u00e9as, protection, risque naturel (inondation), m\u00e9t\u00e9orologie (dynamique des masses d\u2019eau)<\/span><\/p>\n<table style=\"height: 405px\" width=\"1120\">\n<tbody>\n<tr>\n<td colspan=\"2\" width=\"321\">\n<p style=\"text-align: center\"><span style=\"color: #000000\"><strong>Coll\u00e8ge<\/strong><\/span><\/p>\n<\/td>\n<td width=\"321\">\n<p style=\"text-align: center\"><span style=\"color: #000000\"><strong>Lyc\u00e9e<\/strong><\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"58\"><span style=\"color: #000000\">Cycle 3<\/span><\/td>\n<td width=\"264\"><span style=\"color: #000000\">Relier certains ph\u00e9nom\u00e8nes naturels (temp\u00eates, inondations, tremblements de terre) \u00e0 des risques pour les populations.<\/span><\/p>\n<p><span style=\"color: #000000\">Ph\u00e9nom\u00e8nes g\u00e9ologiques traduisant activit\u00e9 interne de la terre (volcanisme, tremblements de terre&#8230;).<\/span><\/p>\n<p><span style=\"color: #000000\">Ph\u00e9nom\u00e8nes traduisant l\u2019activit\u00e9 externe de la Terre : ph\u00e9nom\u00e8nes m\u00e9t\u00e9orologiques et climatiques ; \u00e9v\u00e8nements extr\u00eames (temp\u00eates, cyclones, inondations et s\u00e8cheresses&#8230;).<\/span><\/td>\n<td width=\"321\"><span style=\"color: #000000\">&nbsp;<\/span><\/td>\n<\/tr>\n<tr>\n<td width=\"58\"><span style=\"color: #000000\">Cycle 4<\/span><\/td>\n<td width=\"264\"><span style=\"color: #000000\">Les ph\u00e9nom\u00e8nes naturels : risques et enjeux pour l\u2019\u00eatre humain<\/span><\/p>\n<p><span style=\"color: #000000\">Notions d\u2019al\u00e9as, de vuln\u00e9rabilit\u00e9 et de risque en lien avec les ph\u00e9nom\u00e8nes naturels ; pr\u00e9visions<\/span><\/td>\n<td width=\"321\"><span style=\"color: #000000\">&nbsp;<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"color: #000000\"><strong><u>Capacit\u00e9s et attitudes<\/u> :<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">D3 &#8211; Percevoir le lien entre sciences et techniques<\/span><\/p>\n<p><span style=\"color: #000000\">D4 &#8211; Montrer de l\u2019int\u00e9r\u00eat pour les progr\u00e8s scientifiques et techniques<\/span><\/p>\n<p><span style=\"color: #000000\">E2 &#8211; Manifester de l\u2019int\u00e9r\u00eat pour la vie publique et les grands enjeux de la soci\u00e9t\u00e9<\/span><\/p>\n<p><span style=\"color: #000000\">E3 &#8211; \u00catre conscient de sa responsabilit\u00e9 face \u00e0 l\u2019environnement, la sant\u00e9, le monde vivant<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Coordonn\u00e9es g\u00e9ographiques et GPS du parking 44.202252 0.606438 Description du site : \u00c0 hauteur des villes d\u2019Agen et du Passage d\u2019Agen, la Garonne est ceintur\u00e9e de digues qui ont \u00e9t\u00e9 &#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-167","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/167","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=167"}],"version-history":[{"count":9,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/167\/revisions"}],"predecessor-version":[{"id":1105,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/167\/revisions\/1105"}],"wp:attachment":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/media?parent=167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}