An optical fiber sensing system according to the present disclosure comprises: an optical fiber (10) placed in a water discharge gate (30) of a reservoir or in the vicinity of the water discharge gate (30); a reception unit (21) that receives, from the optical fiber (10), an optical signal including a vibration pattern; and a detection unit (22) that detects whether an opening degree of the water discharge gate (30) is appropriate or not on the basis of the vibration pattern included in the optical signal.
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