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Neutrinos of astrophysical origin could be detected through theelectromagnetic radiation of the particle showers induced in the atmosphere bytheir interaction in the Earth. This applies in particular for tau neutrinos ofenergies $E>10^{16}$eV following Earth-skimming trajectories. The$\sim1^{\circ}$ beaming of the radio emission in the forward direction howeverimplies that the radio signal will likely fly above a detector deployed over aflat site and would therefore not be detected. We study here how a non-flatdetector topography can improve the detection probability of theseneutrino-induced air showers. We do this by computing with three distinct toolsthe neutrino detection efficiency for a radio array deployed over a toy-modelmountainous terrain, also taking into account experimental and topographicconstraints. We show in particular that ground topographies inclined by fewdegrees only induce detection efficiencies typically three times larger thanthose obtained for flat areas for favorable trajectories. We conclude that thetopography of the area where the detector is deployed will be a key factor foran experiment like GRAND.

Radio-detection of neutrino-induced air showers: the influence of topography