Las resurgencias del Alto Mayo (San Martin, Perú) : estudio hidrológico sobre un karst tropical andino-amazónico Article - 2017

Olivier Grandjouan, Liz Hidalgo, James Apaéstegui, Patrice Baby, Gérard Cochonneau, Elmer Condori, Jhan Carlo Espinoza, Pascal Fraisy, Darwin Huaman, Herve Jourde, Naomi Mazzilli, Sergio B Morera, Fluquer Peña, Fabien Renou, Xavier Robert, William Santini, Abdelfettah Sifeddine, Jean Loup Guyot

Olivier Grandjouan, Liz Hidalgo, James Apaéstegui, Patrice Baby, Gérard Cochonneau, Elmer Condori, Jhan Carlo Espinoza, Pascal Fraisy, Darwin Huaman, Herve Jourde, Naomi Mazzilli, Sergio B Morera, Fluquer Peña, Fabien Renou, Xavier Robert, William Santini, Abdelfettah Sifeddine, Jean Loup Guyot, « Las resurgencias del Alto Mayo (San Martin, Perú) : estudio hidrológico sobre un karst tropical andino-amazónico  », Boletin de la Sociedad geologica del Perù, 2017, pp. 83-86. ISSN 0079-1091

Resumen

The Alto Mayo calcareous mountains (San Martin, Perú) present a developed and active karstic system, nowadays poorly studied. The aim of this study is to determine the discharge of the main resurgences of this region and their catchment area. We used hydrologic and pluviometric data used from the local observatory (ANA and SENAMHI) and from the KarstAm project. We measured some resurgences” discharges at 24 m3/s on average, ranking them among the most important of South America. The seasonable variability of the discharges shows an atypical behavior, closer to a porous than a karstic aquifer. As the specific discharges are higher than the regional tendency, we reevaluated catchment areas, by assuming the presence of major karstic captures upstream. We also corrected the precipitation values using the regional vector method. These recalculated specific discharges are then closer to the regional tendency, but the run-off coefficient remains too high. We attribute the errors to the precipitations values in the global Alto Mayo basin that seem underestimated.

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