{"id":1647,"date":"2014-03-17T16:34:24","date_gmt":"2014-03-17T19:34:24","guid":{"rendered":"https:\/\/www.dev-id.co\/riverkeeper\/?p=1647"},"modified":"2020-12-01T13:02:00","modified_gmt":"2020-12-01T17:02:00","slug":"la-riviere-en-amont-continue-de-se-retrecir-malgre-louverture-des-ecluses","status":"publish","type":"post","link":"http:\/\/petitcodiac.net\/fr\/la-riviere-en-amont-continue-de-se-retrecir-malgre-louverture-des-ecluses\/","title":{"rendered":"LA RIVI\u00c8RE EN AMONT CONTINUE DE SE R\u00c9TR\u00c9CIR, MALGR\u00c9 L\u2019OUVERTURE DES \u00c9CLUSES."},"content":{"rendered":"\n<p><em>Par Georges Brun, Patrouilleur officiel des Sentinelles Petitcodiac<\/em><br><em>Correction: Monique Arsenault<br><\/em><\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Control Structure Gates Block Ice Passage - Les \u00e9cluses bloquent le passage des glaces\" width=\"580\" height=\"326\" src=\"https:\/\/www.youtube.com\/embed\/Z6QtxLxo2j4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><strong>Saviez-vous que le mascaret se meurt \u00e0 Turtle Creek ?<\/strong><\/p>\n\n\n\n<p>Lors d\u2019une visite en hiver \u00e0 l\u2019embouchure de la rivi\u00e8re Turtle Creek qui rejoint la rivi\u00e8re Petitcodiac, il est possible de constater la distance entre 4 ou 5 mar\u00e9es successives, indiqu\u00e9es par les brisures transversales dans les glaces. Ces brisures indiquent l\u2019endroit o\u00f9 le mascaret de la rivi\u00e8re Petitcodiac se termine.&nbsp;Le mascaret qui se fraye un passage sous le pont-chauss\u00e9e et \u00e0 travers sa structure de contr\u00f4le atteint des endroits&nbsp;diff\u00e9rents en amont selon la force des mar\u00e9es quotidiennes. Les br\u00e8ches dans la glace sont le r\u00e9sultat de la pression de l\u2019eau sous la glace qui la fait lever. Vous pouvez constater une de ces brisures dans la photo ci-dessous indiquant l\u2019endroit o\u00f9 un mascaret s\u2019est termin\u00e9.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"375\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/1-3.jpg\" alt=\"\" class=\"wp-image-1649\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/1-3.jpg 500w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/1-3-300x225.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<p>La question que j\u2019aimerais vous lancer est la suivante&nbsp;: si l\u2019on rempla\u00e7ait compl\u00e8tement&nbsp;la structure de contr\u00f4le des mar\u00e9es et le pont-chauss\u00e9e reliant Moncton et Riverview au complet par un pont, est-ce que le mascaret se terminerait plus loin ?<strong><br>Les \u00e9cluses ne sont pas assez \u00e9lev\u00e9es.<\/strong><\/p>\n\n\n\n<p>La structure de contr\u00f4le des mar\u00e9es situ\u00e9e sous le pont-chauss\u00e9e reliant Moncton et Riverview a \u00e9t\u00e9 construite entre 1966 et 1968.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/2-3.jpg\" alt=\"\" class=\"wp-image-1651\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/2-3.jpg 1024w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/2-3-300x225.jpg 300w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/2-3-768x576.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Cette section du pont-chauss\u00e9e fait partie de la terre ferme et non de la rivi\u00e8re proprement dite. Elle a \u00e9t\u00e9 en fonction jusqu\u2019en avril 2010 lorsque la Cour a d\u00e9cid\u00e9 que la province devait ouvrir les \u00e9cluses pour favoriser la migration des multiples esp\u00e8ces de poissons et faciliter un \u00e9coulement plus naturel.<\/p>\n\n\n\n<p>Quoique la rivi\u00e8re se porte de&nbsp;mieux en mieux&nbsp;depuis l\u2019ouverture des \u00e9cluses et s\u2019agrandit pour retrouver son \u00e9coulement naturel en aval,&nbsp;<strong>elle se r\u00e9tr\u00e9cit de plus en plus en amont.<\/strong>&nbsp;La structure de contr\u00f4le des mar\u00e9es contribue \u00e0 ce probl\u00e8me. <\/p>\n\n\n\n<p>Voici pourquoi:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/3-5.jpg\" alt=\"\" class=\"wp-image-1653\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/3-5.jpg 640w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/3-5-300x225.jpg 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p>Le niveau de l\u2019eau munie de sa couche de glace&nbsp;peut \u00eatre tr\u00e8s \u00e9lev\u00e9 pendant la p\u00e9riode hivernale, \u00e0 mar\u00e9e haute. Il ne faut pas oublier que le passage des eaux de la rivi\u00e8re et son cycle d\u2019\u00e9coulement sont influenc\u00e9s par les fontes, les fortes pluies et les variations locales et r\u00e9gionales de la temp\u00e9rature.<\/p>\n\n\n\n<p>Les \u00e9cluses de la structure de contr\u00f4le sont partiellement ouvertes. Elles pourraient l\u2019\u00eatre encore plus. Vous pouvez voir la hauteur des portes dans la photo ci-dessous, prise \u00e0 mar\u00e9e basse.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/4-5.jpg\" alt=\"\" class=\"wp-image-1656\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/4-5.jpg 640w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/4-5-300x225.jpg 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p>Les \u00e9cluses pourraient \u00eatre ouvertes d\u2019au moins un m\u00e8tre de plus.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/5-3.jpg\" alt=\"\" class=\"wp-image-1658\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/5-3.jpg 1024w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/5-3-300x225.jpg 300w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/5-3-768x576.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Actuellement, lors des fortes mar\u00e9es hivernales et printani\u00e8res, les glaces se heurtent aux portes des \u00e9cluses de la structure de contr\u00f4le et n\u2019arrivent pas \u00e0 s\u2019y frayer un passage ad\u00e9quat.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/6-3.jpg\" alt=\"\" class=\"wp-image-1660\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/6-3.jpg 1024w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/6-3-300x225.jpg 300w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/6-3-768x576.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/7-3.jpg\" alt=\"\" class=\"wp-image-1662\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/7-3.jpg 640w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/7-3-300x225.jpg 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p><strong>La structure de contr\u00f4le agit comme un entonnoir.<\/strong><\/p>\n\n\n\n<p>La structure de contr\u00f4le ne d\u00e9passe gu\u00e8re les 50 m\u00e8tres de largeur alors que la rivi\u00e8re en aval est environ 400 m\u00e8tres de large. Imaginez tout ce volume d\u2019eau qui essaye de se frayer un passage dans cet espace r\u00e9tr\u00e9ci! La structure de contr\u00f4le agit alors un peu comme un entonnoir, r\u00e9duisant le d\u00e9bit de la rivi\u00e8re et l\u2019emp\u00eachant de couler le plus naturellement possible.<\/p>\n\n\n\n<p><strong><br>Sans le passage des glaces et d\u2019un volume ad\u00e9quat d\u2019eau, la rivi\u00e8re continue de se r\u00e9tr\u00e9cir en amont.<\/strong><\/p>\n\n\n\n<p>Le passage des glaces est important pour le processus de drainage et d\u2019\u00e9rosion naturelle qui doit avoir lieu dans la rivi\u00e8re. Sans ce processus, la rivi\u00e8re se r\u00e9tr\u00e9cit en amont. Dans la photo ci-dessous, on peut voir que la rivi\u00e8re devient de plus en plus \u00e9troite dans les environs de Riverview, l\u00e0 o\u00f9 \u00e9tait auparavant le lac artificiel. En hiver, les d\u00e9p\u00f4ts de s\u00e9diments s\u2019accumulent et g\u00e8lent, n\u00e9cessitant encore plus de chaleur et de volume d\u2019eau pour \u00e9roder le tout.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"424\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/8-3.jpg\" alt=\"\" class=\"wp-image-1664\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/8-3.jpg 640w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/8-3-300x199.jpg 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p><strong>Des d\u00e9p\u00f4ts de gravier en amont.<\/strong><\/p>\n\n\n\n<p>Enfin, notez l\u2019accumulation de gravier tout pr\u00e8s de la structure de contr\u00f4le, laiss\u00e9e par les glaces qui ont fondu. L\u2019accumulation de gravier se fait quand la couche de glace et les eaux n\u2019arrivent pas \u00e0 se frayer un passage complet de l\u2019autre c\u00f4t\u00e9 de la structure de contr\u00f4le, sous le pont-chauss\u00e9e, et qu\u2019elles sont ainsi refoul\u00e9es, d\u00e9posant leurs s\u00e9diments le long des berges de la rivi\u00e8re.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.dev-id.co\/riverkeeper\/wp-content\/uploads\/2020\/11\/9-3.jpg\" alt=\"\" class=\"wp-image-1666\" srcset=\"http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/9-3.jpg 640w, http:\/\/petitcodiac.net\/wp-content\/uploads\/2020\/11\/9-3-300x225.jpg 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p><strong>La solution&nbsp;: enlever la structure de contr\u00f4le.<\/strong><\/p>\n\n\n\n<p>L\u2019ouverture des \u00e9cluses en 2010 a certes beaucoup aid\u00e9 la rivi\u00e8re \u00e0 retrouver son \u00e9coulement naturel. Toutefois, je suis d\u2019avis que les \u00e9cluses de la structure de contr\u00f4le pourraient \u00eatre lev\u00e9es encore plus haut pour laisser passer un plus grand volume d\u2019eau. J\u2019ose aussi esp\u00e9rer qu\u2019un jour &nbsp;nous pourrons enlever au complet la structure de contr\u00f4le et le pont-chauss\u00e9e pour les remplacer par un pont d\u2019une hauteur ad\u00e9quate. Ainsi, le mascaret pourrait continuer son cheminement beaucoup plus loin que Turtle Creek. De plus, avec le temps, l\u2019\u00e9rosion naturelle par la rivi\u00e8re et ses fortes mar\u00e9es aiderait \u00e0 \u00e9largir&nbsp;la rivi\u00e8re en amont dans les environs de Riverview, l\u00e0 o\u00f9 \u00e9tait le lac artificiel auparavant. Nous pourrions ainsi profiter de la beaut\u00e9 et de la sant\u00e9 de notre rivi\u00e8re, grande, large et majestueuse, ayant repris sa gloire d\u2019antan.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Par Georges Brun, Patrouilleur officiel des Sentinelles PetitcodiacCorrection: Monique Arsenault Saviez-vous que le mascaret se meurt \u00e0 Turtle Creek ? Lors d\u2019une visite en hiver \u00e0 l\u2019embouchure de la rivi\u00e8re Turtle Creek qui rejoint la rivi\u00e8re Petitcodiac, il est possible de constater la distance entre 4 ou 5 mar\u00e9es successives, indiqu\u00e9es par les brisures transversales [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Par Georges Brun, Patrouilleur officiel des Sentinelles PetitcodiacCorrection: Monique Arsenault Saviez-vous que le mascaret se meurt \u00e0 Turtle Creek ? 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