[en] For the past 15 years, the mouth region has been altered by an accumulation of hydrological risks against which state policies have shown limits. Today, it is necessary to invest new creative imaginations to re-enchant its adaptive governance trajectory, which has been unsustainable until now. In order to document a possible sustainable transition, I propose a socio-hydrological monograph - a geophysical and human description - of the panorama of the area around the mouth of the Senegal River, before characterizing its trajectory of adaptive governance since the 1970s and finally, I present the agenda of its possible re-enchantment, in a pluralistic, relational and cosmopolitan dimension of knowledge. The analytical timescale of this paper is documented through a collection of "mixed" empirical data - field surveys (53 informants surveyed); academic archives; administrative/institutional documents -. The treatment of this empirical corpus proves that, apart from scholarly knowledge, local/vernacular knowledge co-exists and can give new impetus to public policies in distress, in the face of ecological disasters that have become planetary. This paper will focus on local knowledge in a context of combined ecological crisis. Thanks to a plurality of corpora from the work of the French Ministry of Colonies, qualitative interviews and academic archives. Thus, I define the organization of scientific knowledge carried by the actors of hydrological governance, then prove the coexistence of traditional knowledge still invisible held by indigenous populations through observation and field missions that have allowed to interview 53 individuals between 2016 and 2017 in the town of Gandiol. My results show that apart from the scholarly knowledge that is constantly emerging among elites and technocrats, memories, narratives, techniques, and strategies coexist and function. Thus, in an increasingly vulnerable world (floods, drought, marine submersion, erosive beach crises), where public policies, scientific and technical knowledge have shown their limits in the face of global ecological disasters, a decolonization of environmental imaginations is necessary thanks to a recognition of knowledge, a rebalancing of systems of thought, philosophies and epistemologies. It is in this register that my research is mobilizing real alternatives to re-found the contents of local knowledge (learned and traditional) in the construction of resilience in the service of hybrid intelligence. A contribution to the field of local/vernacular knowledge, in a discipline such as geography.

[fr] Depuis 15 ans, la région de l'embouchure est altérée par une accumulation des risques hydrologiques face auxquels les puissances publiques nationales et supranationales ont montré des limites. Aujourd'hui, il est nécessaire d'investir de nouveaux imaginaires créatifs pour réenchanter sa trajectoire de gouvernance adaptative jusque-là peu soutenable. Pour documenter une possible transition soutenable, je propose une monographie sociohydrologique – description géophysique et humaine – du panorama de la zone de l'embouchure du Sénégal, avant de caractériser sa trajectoire de gouvernance adaptative depuis les années 1970 et pour finir, je présente l'agenda de son possible réenchantement, dans une dimension pluriverselle, relationnelle et cosmopolite des savoirs. Les temps analytiques de ce papier sont documentés grâce à un recueil de données empiriques " mixtes " – enquêtes de terrains (53 informateurs enquêtés) ; archives académiques ; documents administratifs/institutionnels. Le traitement de ce corpus empirique prouve qu'en dehors des savoirs savants, des savoirs locaux/vernaculaires co-existent et peuvent donner un nouveau souffle aux politiques publiques en détresse, face aux désastres écologiques devenus planétaires.