Fig. 2

a Technical sketch of the Lander System with its different components (sensors, tripods aluminium frame, datalogger). b Photograph of the Lander System not equipped with the conductivity sensors. c Two different configuration of the Lander System were used during mesurements. On the left, the waterproof case with the batteries is placed directly on the Lander System making necessary to recover it for battery changes. On the right, the waterproof case with the batteries is place on the buoy allowing batteries changes without recovery of the Lander System