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There has long been debate about the relative importance of abrasion versus selective deposition of the coarsest clasts in causing downstream fining of sediment in river systems. Although high fining rates observed in many natural rivers seem to require strong selective deposition, the ability of selective deposition to produce downstream size sorting has(More)
[1] The Earth's surface is shaped by the interaction of tectonics, water, sediment, solutes, and biota over a wide range of spatial and temporal scales and across diverse environments. Development of a predictive science of Earth surface dynamics integrates many disciplines and approaches, including hydrology, geomorphology, ocean and atmospheric science,(More)
Using experimental data, we show how erosional unconformities (sequence boundaries) form and evolve in response to changes in global sea level (eustasy), given passive margin style subsidence and constant conditions of supply of sediment and water. We distinguish between two types of erosional unconformities; broad planar erosional surfaces that form during(More)
[1] In depositional systems, channels migrate from one location to another, causing erosion and deposition at any given point in the domain. The durations of depositional and erosional events, as well as their magnitudes, control the structure of the stratigraphic record. In this study, we use high‐resolution temporal surface elevation data from a(More)
[1] Landscapes share important similarities with turbulence: both systems exhibit scale invariance (self-similarity) over a wide range of scales, and their behavior can be described using comparable dynamic equations. In particular, modified versions of the Kardar-Parisi-Zhang (KPZ) equation (a low-dimensional analog to the Navier-Stokes equations) have(More)
We present a comprehensive approach for validating braided-stream models and apply it to a specific cellular braided-stream model. The approach involves quantitative comparison of modeled and natural braided streams in terms of two main aspects: the sequential organization of their plan patterns studied using their state-space characteristics and the(More)
This White Paper has been written solely by the Principal Investigator, who must accordingly assume the customary full responsibility for the views expressed and for any errors and omissions. The overall form of the Paper was fashioned initially through an opening Project Workshop held at the, and discussions thereafter of the Workshop's outcomes. Design of(More)
Turner et al. (Reports, 20 October 2006, p. 449) measured sedimentation from Hurricanes Katrina and Rita in coastal Louisiana and inferred that storm deposition overwhelms direct Mississippi River sediment input. However, their annualized hurricane deposition rate is overestimated, whereas riverine deposition is underestimated by at least an order of(More)