What term describes the orderly undulations of the ocean surface formed by mature wind waves of one wavelength?

The term that describes the orderly undulations of the ocean surface formed by mature wind waves of one wavelength is "swell." Swell refers to the long, smooth waves that are generated by wind blowing over a large area of the ocean. As these waves travel, they lose their steepness and take on a more rounded shape, creating a well-defined, organized pattern on the ocean's surface.

Swell can travel vast distances across the ocean and is characterized by a consistent wavelength and height, distinguishing it from other types of waves that may be shorter-lived and influenced by local conditions. Understanding swell is crucial for navigation, surfing, and studying coastal processes, as it helps predict wave behavior and the potential for coastal erosion or sediment transport.

Other terms listed have different meanings; for example, rogue waves are unexpectedly large and dangerous waves that can occur in open waters and are not related to the steady formation of swell. Surf beat refers to the fluctuating intensity of wave energy in a surf zone, while wave trains are sequences of waves that travel together but do not specifically indicate the uniformity associated with swell.