Suspended sediment load transport in the Mississippi River basin at St. Louis: Temporal scaling and nonlinear determinism

Abstract

This study investigates the dynamic behavior of suspended sediment load transport at different temporal scales in the Mississippi River basin. Data corresponding to five successively doubled temporal scales (i.e. daily, two-day, four-day, eight-day and 16-day) from the St. Louis gaging station in Missouri are analyzed. The investigation is focused on identifying possible low-dimensional deterministic behavior in the suspended sediment load transport dynamics, with an aim towards reduction in model complexity. The correlation dimension method is used to identify low-dimensional determinism. The suspended sediment load dynamics are represented through phase-space reconstruction, and the variability is estimated using the (proximity of) reconstructed vectors in the phase space. The results indicate the presence of low-dimensional determinism in the suspended sediment load series at each of the five temporal scales, with the variables dominantly governing the dynamics in the order of three or four. These results not only suggest the appropriateness of relatively simpler models but also hint at possible scale invariance in the suspended sediment load transport dynamics. Copyright © 2006 John Wiley & Sons, Ltd.