Acoustic Survey at Stream

I descended from the wooden bridge down to the moist soil flank near the stream. The steady water flow produced continuous low-frequency hums across the sector. To measure acoustic vibration, I propped my blaster upright against a damp grey pebble. I selected three flat, smooth river pebbles from the shoreline. Using both hands, I dropped them sequentially into a calm eddy pool. Plink, plink, plink. Each impact yielded a clean, high-pitch report distinct from the stream's rumble. I aligned the retrieved stones along the mossy edge to mark the test point. Acoustic variance logged. Elevation post remained clear.