“Buffers, barriers and blankets” have become recognized as increasingly important components of landscape that constrain rates of denudation. Nevertheless, connectivity continues to be emphasized in recent geomorphic discussions. It is surely the case that spatial and temporal disconnectivity is at least as common as connectivity in geomorphic sediment systems. The importance of intermittency of sediment movement events (disconnectivity over time) has been understood as fundamental in most understandings of landscape evolution. The development of new techniques that make the term connectivity more mathematically precise are much to be welcomed. But the case is argued that more progress has been made in understanding geomorphological spatial and temporal change by interrogating disconnectivity, discontinuities and thresholds.
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