Preprint of Capape, S., Martín-Vide, J., and Colombo, F. (2016). “Subaqueous Barchans and 1 Plane Beds from Deposition of Quartz Silt.” J. Hydraul. Eng., 10.1061/(ASCE)HY.19432 7900.0001212, 06016020 3 Subaqueous Barchans and Plane Beds from Deposition of Quartz Silt 4 S. Capape*, J.P. Martín-Vide, and F. Colombo 5 Abstract 6 The suspension flow of quartz silt (geometric mean grain size of 4.15...

Subsurface flows, particularly hyporheic exchange fluxes, driven by streambed topography, permeability, channel gradient and dynamic flow conditions provide prominent ecological services such as nitrate removal from streams aquifers. Stream dynamics cause strongly nonlinear often episodic contributions of nutrient concentrations in river-aquifer systems. Using a fully coupled transient reactive...

Abstract Sand waves are dynamic and regular bedforms that ubiquitous in sandy shelf seas. However, information about the ecological characteristics (e.g., benthic community structure) their spatial variability within these habitats is very limited. To address this knowledge gap, we undertook a field campaign summer 2017 to investigate macrofaunal composition of sand wave area off Texel (Dutch p...

A model is discussed which describes the interaction between tidal currents, sediment transport and bedform changes in a one dimensional short embay-ment with a constant width. The water motions are described by the depth{ integrated shallow water equations. They are forced by prescribed free surface elevations at the entrance which consist of a basic tide and a rst overtide. For the sediment d...

The influence of near-bed sorting processes on heavy mineral content in suspension is discussed. Sediment concentrations above a rippled bed of mixed quartz and heavy mineral sand were measured under regular nonbreaking waves in the laboratory. Using the traditional gradient diffusion process, settling velocity would be expected to strongly affect sediment distribution. This was not observed du...

The dynamics of river bed evolution are known to be notoriously complex affected by near-bed turbulence, the collective motion of clusters of particles of different sizes, and the formation of bedforms and other large-scale features. In this paper, we present the results of a study aiming to quantify the inherent nonlinearity and complexity in gravel bed dynamics. The data analyzed are bed elev...

Recent studies on seafloor mapping have presented different modelling methods for the automatic classification of sediments. However, most these applied models to data with appropriate numbers ground-truth samples and without consideration imbalances in datasets. In this study, we aim address issues by conducting class-specific predictions using ensemble map sediment distributions minimal combi...

Channel dredging has become a common phenomenon across several fluvial systems. Pits dredged in the riverbank can influence downstream turbulence and affect bank slope central channel morphodynamics. Erodible bed experiments were conducted laboratory flume having cross section with three different slopes, i.e., 25°, 31°, 40° without mining pit. Flow over near toe was most affected by pit excava...

Streams and rivers, particularly smaller ones, often do not maintain steady flow rates for long enough to reach equilibrium conditions sediment transport bed topography. In particular, streams in small watersheds may be subject rapidly changing hydrographs, relict bedforms from previous high flows can cause further disequilibrium that complicates the prediction of rates. order advance understan...