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Redevances et prélèvements optimaux dans les aquifères côtiers menacés d'intrusion saline : les principes de base

  • Bernard Caussade
  • Michel Moreaux
  • Arnaud Reynaud

[eng] Optimum Charging and Pumping for Coastal Aquifers in Danger of Saline Intrusion: Basic Principles by Bernard Caussade, Michel Moreaux and Arnaud Reynaud The intrusion of salt water into coastal aquifers is now one of the main causes of deterioration in their water quality. Sea water, which is denser than fresh water, invades these aquifers as soon as pumping is heavy enough to change the hydrostatic equilibrium. The object of this paper is to identify the specific problems posed by optimum management of this type of resource. We show that the effect of heavier pumping is to move further from the coast the boundary beyond which sustainable abstraction is possible inland. This relationship between volumes pumped and the siting of boreholes generates a specific externality, whose effects on optimum use of resources we analyse. [fre] Les problèmes d'intrusion d'eau salée dans les aquiferes côtiers constituent aujourd'hui l'une des principales causes de détérioration de la qualité de leurs eaux. L'eau de mer, plus dense que l'eau douce, envahit ces aquiferes dès que les prélèvements sont suffisamment intenses pour modifier l'équilibre hydrostatique. L'objet de cet article est d'identifier les problèmes particuliers posés par la gestion optimale de ce type de ressource. Nous montrons qu'une intensification des prélèvements a pour conséquence d'éloigner de la côte la frontière au-delà de laquelle, vers l'intérieur des terres, on peut prélever de façon permanente. Cette relation entre volumes prélevés et positionnements obligés des points de prélèvement est génératrice d'une externalité spécifique dont nous analysons les effets sur l'usage optimal de la ressource.

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Article provided by Programme National Persée in its journal Économie & prévision.

Volume (Year): 143 (2000)
Issue (Month): 2 ()
Pages: 155-173

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Handle: RePEc:prs:ecoprv:ecop_0249-4744_2000_num_143_2_6099
Note: DOI:10.3406/ecop.2000.6099
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