Dunes are the most prevalent bedform present in sand-bedded rivers and their morphology typically comprises multiple scales of three-dimensional topography. However, our understanding flow over dunes is predicated largely on two-dimensional models, a condition which rare nature. Here, we results Large Eddy Simulations static, dune field, using two- three- dimensional topographic realisation, to...

The radial tidal sand ridge (RTSR) off the Jiangsu Coast in south Yellow Sea is one of most fantastic and unique natural landscapes world. A large number investigations on geomorphology marine geology have been implemented during last several decades. formation evolution RTSR, however, are still under debate. To resolve this issue, 10 ∼30–60 m-long cores were retrieved from coastal plain offsho...

Turbulence models are critical for depth-averaged flow in at least two ways: (i) as closures momentum equations and (ii) indicators of the spatial variability turbulence intensity field, which is crucial sediment transport bedform evolutions. This paper introduces a novel moment-based k-ε (MDAKE) model that could be considered revised version standard Rastogi–Rodi (SDAKE) can used to estimate t...

This paper introduces a continuous finite element model for two phase flows coupled with evolving bedforms. The method extends the positive definite non-oscillatory algorithm (NFEM) capabilities to predict sediment transport, multiphase flow, and evolution of resulting interfaces limiting fluids, erodible layers non-erodible strata. Free surface hydrodynamics is simulated by integration governi...

Bedrock rivers represent a hydrogeological environment in which surface water flows along an exposed bedrock surface. Studies of hyporheic exchange have exclusively involved composed unconsolidated fluvial sediments, leaving critical knowledge gap. This study evaluates the conditions that could support bedform-scale within fractured sedimentary river based on field data collected near Guelph, C...

Bedforms of Thwaites Glacier, West Antarctica both record and affect ice flow, as shown by geophysical data simple models. Glacier flows across the tectonic fabric Antarctic rift system with its bedrock highs sedimentary basins. Swath radar seismic surveys glacier bed have revealed soft-sediment flutes 100 m or more high extending 15 km basins downglacier from highs. Flutes end at prominent har...