{"id":1533,"date":"2025-01-28T20:11:54","date_gmt":"2025-01-28T19:11:54","guid":{"rendered":"http:\/\/diderot.education\/67337cb07c70b-manon-bonin\/?page_id=1533"},"modified":"2026-09-28T21:31:25","modified_gmt":"2026-09-28T19:31:25","slug":"lac-de-naussac","status":"publish","type":"page","link":"http:\/\/diderot.education\/67337cb07c70b-manon-bonin\/lac-de-naussac\/","title":{"rendered":"Lac de Naussac"},"content":{"rendered":"\t\t
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Lac de Naussac : entre souvenirs submerg\u00e9s et nature renouvel\u00e9e<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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En Loz\u00e8re, la construction du barrage de Naussac et la cr\u00e9ation du lac artificiel, ont profond\u00e9ment modifi\u00e9 les territoires locaux. Si cette infrastructure hydraulique a \u00e9t\u00e9 pens\u00e9e pour r\u00e9pondre \u00e0 des besoins humains, ses cons\u00e9quences sur les habitants et sur la biodiversit\u00e9 (\u00e0 la fois n\u00e9gatives et positives) soul\u00e8vent des interrogations sur l\u2019\u00e9quilibre fragile entre d\u00e9veloppement et pr\u00e9servation de l\u2019environnement<\/strong>.<\/em><\/p>

Le lac et ses myst\u00e9rieux vestiges<\/em><\/h2>

Le lac de Naussac, de 10.8 km2, est aliment\u00e9 par le ruisseau du Donozau. Il a \u00e9t\u00e9 cr\u00e9\u00e9 en 1980<\/strong> pr\u00e8s de Langogne (Margeride – Loz\u00e8re) pour r\u00e9guler le d\u00e9bit d’eau minimum de l’Allier. La retenue d’eau est de 190 millions de m3, soit l\u2019\u00e9quivalent d\u2019environ 190 stades de football<\/strong> remplis d\u2019eau.<\/p>

Deux ans plus tard, le lac \u00e0 englouti le village de Naussac initialement pr\u00e9sent \u00e0 l’emplacement du lac. Cela a engendr\u00e9 des conflits locaux<\/strong> et de nombreux foyers ont perdu leur habitation. En effet, au total, 10 villages ou lieux-dits, soit environ 70 maisons, ont \u00e9t\u00e9 ray\u00e9s de la carte. Et \u00e0 ce jour, Naussac reste le dernier village sacrifi\u00e9<\/strong> pour la construction d\u2019un barrage en France.<\/p>

Durant les p\u00e9riodes de s\u00e9cheresse, le lac se d\u00e9semplit et laisse transpara\u00eetre les vestiges de cet ancien village<\/strong>. Cela a \u00e9t\u00e9 le cas lors de la s\u00e9cheresse de 2022, faisant remonter \u00e0 la surface la triste histoire des habitants de Naussac.<\/p>

Impacts sur les \u00e9cosyst\u00e8mes terrestres<\/strong><\/em><\/h2>

Avant la mise en eau, la vall\u00e9e de Naussac \u00e9tait un \u00e9cosyst\u00e8me riche<\/strong>, compos\u00e9 de prairies, de bois et de terres agricoles. Ce paysage, abritant une biodiversit\u00e9 vari\u00e9e<\/strong>, a \u00e9t\u00e9 englouti sous les eaux pour les besoins de l’Homme.<\/p>

Cette construction, qui a permis la submersion de la vall\u00e9e, a entra\u00een\u00e9 dans le m\u00eame temps la disparition de nombreux habitats terrestres<\/strong> :<\/p>

  • Notamment les zones humides<\/strong>, essentielles pour la nidification de certains oiseaux.<\/li>
  • Ou encore les for\u00eats<\/strong> o\u00f9 vivaient des mammif\u00e8res et des insectes sp\u00e9cifiques.<\/li><\/ul>

    Ainsi, des esp\u00e8ces locales, incapables de s\u2019adapter \u00e0 ces changements, ont vu leur population d\u00e9cliner<\/strong>, si ce n’est dispara\u00eetre. Pour d’autres, ils ont d\u00fb migrer<\/strong> vers d\u2019autres zones, souvent d\u00e9j\u00e0 occup\u00e9es, entra\u00eenant des rivalit\u00e9s li\u00e9es \u00e0 la survie des individus.<\/p>

    Par exemple, les oiseaux inf\u00e9od\u00e9s aux milieux humides et prairiaux, ou encore certaines plantes end\u00e9miques. Toutefois, sans \u00e9tudes \u00e9cologiques<\/strong> d\u00e9taill\u00e9es men\u00e9es avant et apr\u00e8s la construction du barrage, il est difficile de fournir des exemples pr\u00e9cis et v\u00e9rifi\u00e9s.<\/p>

    Un nouveau milieu aquatique
    <\/strong><\/em><\/h2>

    La cr\u00e9ation du lac de Naussac a donn\u00e9 naissance \u00e0 un \u00e9cosyst\u00e8me aquatique<\/strong>, offrant de nouvelles opportunit\u00e9s pour certaines esp\u00e8ces.<\/p>

    Tout d’abord, l\u2019essor d\u2019une faune aquatique. En effet, le lac a rapidement \u00e9t\u00e9 peupl\u00e9 de poissons<\/strong>, comme la perche, le brochet ou la truite, introduits pour le d\u00e9veloppement de la p\u00eache. Ces nouvelles populations ont attir\u00e9 des oiseaux piscivores<\/strong>, comme les h\u00e9rons et les cormorans, qui trouvent dans le lac une source abondante de nourriture. Par ailleurs, des amphibiens<\/strong>, tels que les grenouilles, se sont adapt\u00e9s aux nouvelles conditions du site.<\/p>

    De plus, c’est devenu un refuge pour les oiseaux migrateurs<\/strong>. Certains oiseaux font une halte migratrice et utilisent cette \u00e9tendue d\u2019eau pour se reposer ou se nourrir. Cela a enrichi la diversit\u00e9 locale des oiseaux tout en transformant la r\u00e9gion en un lieu pris\u00e9 pour l\u2019observation ornithologique.<\/p>

    Perturbations hydriques<\/em>
    <\/strong><\/h2>

    Loin de se limiter au site m\u00eame du barrage, les cons\u00e9quences de cet am\u00e9nagement hydraulique se font sentir bien au-del\u00e0, en aval.<\/p>

    Certes sa r\u00e9gulation des cours d’eau limite les crues et les s\u00e9cheresses, mais elle perturbe \u00e9galement les cycles naturels<\/strong> auxquels de nombreuses esp\u00e8ces sont adapt\u00e9es. Par exemple, certaines plantes aquatiques et esp\u00e8ces de poissons, qui d\u00e9pendent des crues saisonni\u00e8res pour se reproduire, subissent des perturbations dans leur cycle de vie.<\/p>

    Un \u00e9quilibre pr\u00e9caire entre progr\u00e8s et nature<\/strong><\/em><\/h2>

    Bien que le lac artificiel ait permis de cr\u00e9er de nouveaux \u00e9cosyst\u00e8mes aquatiques, les pertes initiales en termes de biodiversit\u00e9<\/strong> terrestre et les perturbations en aval soulignent la complexit\u00e9 des choix li\u00e9s \u00e0 l\u2019am\u00e9nagement du territoire.<\/p>

    Cet exemple nous invite donc \u00e0 repenser les futurs projets d\u2019infrastructure pour minimiser leur impact environnemental et mieux int\u00e9grer les enjeux de biodiversit\u00e9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Lac de Naussac - 14 juillet 2024<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    \u00a9 Manon BONIN<\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Sources<\/span> : L’Eveil de la Haute-Loire ; Wikip\u00e9dia<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

    Lac de Naussac : entre souvenirs submerg\u00e9s et nature renouvel\u00e9e En Loz\u00e8re, la construction du barrage de Naussac et la cr\u00e9ation du lac artificiel, ont …<\/p>\n","protected":false},"author":747,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"footnotes":""},"class_list":["post-1533","page","type-page","status-publish","hentry"],"featured_image_src":null,"yoast_head":"\nLac de Naussac - MANON BONIN<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/diderot.education\/67337cb07c70b-manon-bonin\/lac-de-naussac\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lac de Naussac - MANON BONIN\" \/>\n<meta property=\"og:description\" content=\"Lac de Naussac : entre souvenirs submerg\u00e9s et nature renouvel\u00e9e En Loz\u00e8re, la construction du barrage de Naussac et la cr\u00e9ation du lac artificiel, ont …\" \/>\n<meta property=\"og:url\" content=\"http:\/\/diderot.education\/67337cb07c70b-manon-bonin\/lac-de-naussac\/\" \/>\n<meta property=\"og:site_name\" content=\"MANON BONIN\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-28T19:31:25+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/diderot.education\/67337cb07c70b-manon-bonin\/wp-content\/uploads\/sites\/735\/2025\/02\/PXL_20240714_124105233_11zon-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1440\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"http:\\\/\\\/diderot.education\\\/67337cb07c70b-manon-bonin\\\/lac-de-naussac\\\/\",\"url\":\"http:\\\/\\\/diderot.education\\\/67337cb07c70b-manon-bonin\\\/lac-de-naussac\\\/\",\"name\":\"Lac de Naussac - 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