The fluvial sedimentary record is largely composed of deposits from relatively common flow events, rather than more catastrophic scour-and-fill events. At the scales bedforms, such are preserved within stratigraphic because they rapidly accumulate within, and protected by, morphodynamic topographic depressions that occur naturally in system as a result feedbacks between flow, sediment transport...

A two-dimensional model for the erosion generated by viscous free-surface flows, based on the shallow-water equations and the lubrication approximation, is presented. It has a family of self-similar solutions for straight erodible channels, with an aspect ratio that increases in time. It is also shown, through a simplified stability analysis, that a laminar river can generate various bar instab...

A simple model is proposed that describes the various morphodynamic principles of migrating cells from polar to amoeboidal motions. The model equation is derived using competing internal cellular compass variables and symmetries of the system. Fixed points for the N = 2 system are closely investigated to clarify how the competition among polaritors explains the observed morphodynamics. Response...

Understanding the sensitivity of tidal flats to environmental changes is challenging. Currently, most studies rely on process-based models systematically explain morphodynamic evolution flats. In this study, we proposed an alternative empirical approach explore flat dynamics using statistical indices based long-term time series daily surface elevation development. Surface dynamic (SED) focus ma...

we measured the impacts of coastal modification on beach erosion and beach retreat conditions, selecting the miankaleh region as an example of a complex high-pressure free zone with high levels of engineering and tourism activity. nine sampling transects, stretching from the shoreline to a 10 meter depth, were defined and 36 sediment samples were collected from the sea bed at depths of 1, 3, 5,...

The observations will be used to validate existing models and to develop new models for ripple geometry as a function of forcing hydrodynamics and seabed characteristics. The observations will also have a smaller focus on small scale sediment transport processes over ripples and larger scale wave field variability over spatially variable ripples. The small scale sediment transport process obser...

Although it is generally acknowledged that the practical predictability at smaller scales may be limited, output of high-resolution morphodynamic area models is mostly presented at the resolution of the computational grid. The sopresented fields typically are realistic looking, but not necessarily of similar quality at all spatial scales. Unfortunately, commonly used single-number validation me...