{"id":13574,"date":"2025-06-23T21:58:20","date_gmt":"2025-06-23T19:58:20","guid":{"rendered":"https:\/\/bwi.earth\/?p=13574"},"modified":"2025-06-23T22:04:12","modified_gmt":"2025-06-23T20:04:12","slug":"la-lys-une-riviere-discrete-des-enjeux-bien-concrets","status":"publish","type":"post","link":"https:\/\/bwi.earth\/fr\/la-lys-une-riviere-discrete-des-enjeux-bien-concrets\/","title":{"rendered":"La Lys : une rivi\u00e8re discr\u00e8te, des enjeux bien concrets"},"content":{"rendered":"
\n
\n

Situ\u00e9e entre la France et la Belgique, la Lys n\u2019est ni la plus longue, ni la plus puissante des rivi\u00e8res europ\u00e9ennes. Pourtant, elle concentre un certain nombre d\u2019enjeux typiques des petits bassins fortement am\u00e9nag\u00e9s : artificialisation ancienne, gouvernance partag\u00e9e, qualit\u00e9 de l\u2019eau d\u00e9grad\u00e9e, r\u00e9silience climatique \u00e0 construire. Petit tour d\u2019horizon.<\/p>\n

Quelques rep\u00e8res hydrologiques<\/h3>\n

La Lys prend sa source \u00e0 Lisbourg (Pas-de-Calais) et rejoint l\u2019Escaut \u00e0 Gand, en Belgique, apr\u00e8s un parcours d\u2019un peu plus de 210 km<\/strong>. Son bassin versant couvre environ 3 600 km\u00b2<\/strong>, \u00e0 cheval sur deux pays. C\u00f4t\u00e9 fran\u00e7ais, elle traverse notamment Aire-sur-la-Lys, Merville, Armenti\u00e8res et Comines. C\u00f4t\u00e9 belge : Wervik, Courtrai, Deinze.<\/p>\n

Son d\u00e9bit moyen \u00e0 la fronti\u00e8re (Comines) est de l\u2019ordre de 20 m\u00b3\/s<\/strong> (station Y3302010 \u2013 Banque Hydro). Il est cependant tr\u00e8s variable selon les saisons et les \u00e9pisodes pluvieux : la Lys r\u00e9agit rapidement aux pr\u00e9cipitations, du fait de son lit artificialis\u00e9 et de la faible pente moyenne (< 0,6 \u2030 sur la section m\u00e9diane).<\/p>\n

Un cours d\u2019eau parmi les plus am\u00e9nag\u00e9s du nord-ouest europ\u00e9en<\/h3>\n

L\u2019histoire industrielle et agricole du territoire a laiss\u00e9 une empreinte durable sur le fonctionnement hydrologique de la rivi\u00e8re.<\/p>\n

La Lys a \u00e9t\u00e9 canalis\u00e9e d\u00e8s le XIXe si\u00e8cle, \u00e9largie, recalibr\u00e9e, \u00e9quip\u00e9e de barrages mobiles et de stations de pompage pour r\u00e9pondre aux besoins de la navigation, du drainage agricole et de la protection contre les inondations. Elle est aujourd\u2019hui ponctu\u00e9e de plusieurs ouvrages structurants :<\/p>\n

    \n
  • \n

    Barrage de Comines<\/strong>, \u00e0 la fronti\u00e8re, pour la r\u00e9gulation hydraulique entre la France et la Belgique ;<\/p>\n<\/li>\n

  • \n

    Stations de pompage de Wervik et de Menin<\/strong>, utilis\u00e9es en p\u00e9riode de crue pour \u00e9vacuer les exc\u00e9dents d\u2019eau vers l\u2019Escaut ;<\/p>\n<\/li>\n

  • \n

    Vannes mobiles et passes \u00e0 poissons<\/strong> r\u00e9parties en aval, notamment \u00e0 Harelbeke (barrage de classe europ\u00e9enne avec clapets automatiques).<\/p>\n<\/li>\n<\/ul>\n

    Au total, plus de 25 ouvrages<\/strong> impactant la continuit\u00e9 \u00e9cologique ont \u00e9t\u00e9 recens\u00e9s sur le lin\u00e9aire principal entre Aire-sur-la-Lys et Gand (source : ROE \u2013 2022).<\/p>\n

    Une gouvernance bic\u00e9phale, mais coordonn\u00e9e<\/h3>\n

    Depuis les ann\u00e9es 1990, la Lys fait l\u2019objet d\u2019un effort de coordination transfrontali\u00e8re. En France, la gestion est structur\u00e9e autour du SAGE Lys<\/strong>, pilot\u00e9 par le SYMSAGEL<\/strong>, qui regroupe collectivit\u00e9s locales, \u00c9tat, usagers et associations. C\u00f4t\u00e9 belge, c\u2019est la VMM (Vlaamse Milieumaatschappij)<\/strong> qui pilote la politique de l\u2019eau, en coordination avec De Vlaamse Waterweg<\/strong> pour la partie navigation.<\/p>\n

    Des conventions de coop\u00e9ration ont \u00e9t\u00e9 sign\u00e9es entre autorit\u00e9s fran\u00e7aises et flamandes d\u00e8s 1994, renouvel\u00e9es depuis. Une cellule de concertation technique se r\u00e9unit plusieurs fois par an pour ajuster les niveaux d\u2019eau, les p\u00e9riodes de vidange, les actions en cas de crue ou de s\u00e9cheresse.<\/p>\n

    \u00c9tat des lieux : pressions multiples, qualit\u00e9 \u00e0 am\u00e9liorer<\/h3>\n

    D\u2019apr\u00e8s le dernier rapport de l\u2019Agence de l\u2019Eau Artois-Picardie (SDAGE 2022), plus des deux tiers<\/strong> des masses d\u2019eau du bassin versant de la Lys sont class\u00e9es en \u00e9tat \u00e9cologique m\u00e9diocre ou mauvais<\/strong>. En cause :<\/p>\n

      \n
    • \n

      la pollution diffuse<\/strong> (nitrates, phosphore),<\/p>\n<\/li>\n

    • \n

      les rejets urbains<\/strong> mal ma\u00eetris\u00e9s,<\/p>\n<\/li>\n

    • \n

      et la morphologie fortement alt\u00e9r\u00e9e<\/strong>.<\/p>\n<\/li>\n<\/ul>\n

      Quelques chiffres :<\/p>\n

        \n
      • \n

        Nitrates<\/strong> : entre 25 et 35 mg\/l sur la Lawe et la Bourre en moyenne annuelle (seuil de bon \u00e9tat : <18 mg\/l).<\/p>\n<\/li>\n

      • \n

        Phosphore total<\/strong> : souvent > 0,4 mg\/l en aval d\u2019Armenti\u00e8res (norme DCE : 0,2 mg\/l pour rivi\u00e8res lentes).<\/p>\n<\/li>\n

      • \n

        Indice IBGN<\/strong> : inf\u00e9rieur \u00e0 10 dans la plupart des stations fran\u00e7aises, indiquant une macrofaune peu diversifi\u00e9e.<\/p>\n<\/li>\n<\/ul>\n

        Enjeux actuels de la Lys : mieux anticiper, restaurer, adapter<\/h3>\n

        La gestion de la Lys s\u2019oriente aujourd\u2019hui autour de trois priorit\u00e9s :<\/p>\n

          \n
        1. \n

          Pr\u00e9vention des crues<\/strong> : les inondations de d\u00e9cembre 1999, puis celles de 2002 et 2023 ont montr\u00e9 la vuln\u00e9rabilit\u00e9 du bassin, notamment en zone p\u00e9riurbaine. Le PAPI Lys amont (2018\u20132025) pr\u00e9voit plus de 40 millions d\u2019euros d\u2019investissements<\/strong>, avec des zones d\u2019expansion de crue et des ouvrages de ralentissement dynamique.<\/p>\n<\/li>\n

        2. \n

          Restaurer la continuit\u00e9 \u00e9cologique<\/strong> : plusieurs seuils sont en cours d\u2019effacement ou d\u2019am\u00e9nagement (comme \u00e0 Merville ou \u00e0 Steenwerck), afin de faciliter la circulation piscicole et le transport s\u00e9dimentaire.<\/p>\n<\/li>\n

        3. \n

          Am\u00e9liorer la connaissance hydrologique<\/strong> : des stations de mesure en temps r\u00e9el ont \u00e9t\u00e9 install\u00e9es ces derni\u00e8res ann\u00e9es, compl\u00e9t\u00e9es par des dispositifs de pr\u00e9vision des d\u00e9bits \u00e0 3-5-10 jours via des mod\u00e8les coupl\u00e9s (pluie-d\u00e9bit, radar, t\u00e9l\u00e9d\u00e9tection).<\/p>\n<\/li>\n<\/ol>\n

          ***<\/h3>\n

          La Lys, souvent consid\u00e9r\u00e9e comme une rivi\u00e8re secondaire, offre en r\u00e9alit\u00e9, ainsi que le rappelle l\u2019Agence de l\u2019Eau Artois-Picardie (voir ci-dessous), un concentr\u00e9 des probl\u00e9matiques actuelles de gestion int\u00e9gr\u00e9e de l\u2019eau en Europe occidentale : fragmentation institutionnelle, pollution persistante, pression anthropique, adaptation au changement climatique.<\/p>\n

          \n

          \u00ab La Lys concentre sur un petit bassin versant tous les d\u00e9fis de la directive cadre sur l\u2019eau : artificialisation, pollution diffuse, inondations, s\u00e9cheresses. Elle est un laboratoire vivant de coop\u00e9ration franco-belge. \u00bb
          \u2014 Jean-Luc Robert, ing\u00e9nieur hydrologue, Agence de l\u2019Eau Artois-Picardie (colloque AFEID, 2023)<\/em><\/p>\n<\/blockquote>\n <\/div>\n <\/section>\n","protected":false},"excerpt":{"rendered":"

          La Lys, rivi\u00e8re transfrontali\u00e8re entre France et Belgique, cumule artificialisation, pollution diffuse et risques de crue. Son bassin de 3 600 km\u00b2 compte plus de 25 ouvrages impactant la continuit\u00e9 \u00e9cologique. \u00ab\u202fUn laboratoire vivant de coop\u00e9ration franco-belge\u202f\u00bb, selon l\u2019ing\u00e9nieur Jean-Luc Robert (Agence de l\u2019Eau, 2023).<\/p>\n","protected":false},"author":5,"featured_media":13570,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[422],"tags":[423,421,420,419],"class_list":["post-13574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hydrologie","tag-bassin-versant","tag-belgique","tag-france-3","tag-hydrologie"],"acf":[],"yoast_head":"\nLa Lys : une rivi\u00e8re discr\u00e8te, des enjeux bien concrets - Blue Water Intelligence (BWI)<\/title>\n<meta name=\"description\" content=\"La Lys, rivi\u00e8re franco-belge de 210 km, illustre les d\u00e9fis de la gestion de l\u2019eau : pollution, artificialisation, risques d\u2019inondation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bwi.earth\/fr\/la-lys-une-riviere-discrete-des-enjeux-bien-concrets\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La Lys : une rivi\u00e8re discr\u00e8te, des enjeux bien concrets - 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