One of the main challenges in geomorphology and landscape evolution is the space-time variability of driving factors that lead to a distribution of geomorphic responses. By using an elegant experimental design, Phillips et al.  show that the total bed-load sediment transport does not depend on the details of the transient hydraulic forcing. What matters is a measure of integrated transport capacity: flow impulse. This finding has broad implications for landscape evolution modeling and assessment of future geomorphic conditions under uncertain hydrometeorologic regimes.
Citation: Phillips, C. B., Hill, K. M., Paola, C., Singer, M. B., & Jerolmack, D. J. . Effect of flood hydrograph duration, magnitude, and shape on bed‐load transport dynamics. Geophysical Research Letters, 45. https://doi.org/10.1029/2018GL078976
—Valeriy Ivanov, Editor, Geophysical Research Letters