Implementation of a New Bank Erosion Model in Delft3D

Bank erosion plays an important role in the hydro-morphodynamics and evolution of natural rivers. Therefore, it is essential to have a reliable bank erosion model for accurate simulation of hydro-morphodynamic processes. We developed and successfully implemented a new, feasible bank erosion model in Delft3D software. The developed model...

Predictive geospatial model for arsenic accumulation in Holocene aquifers based on interactions of oxbow-lake biogeochemistry and alluvial geomorphology

The identification of arsenic-contamination hotspots in alluvial aquifers is a global-scale challenge. The collection and inventory of arsenic concentration datasets in the shallow-aquifer domain of affected alluvial basins is a tedious and slow process, given the magnitude of the problem. Recent research demonstrates that oxbow-lake...

Clay-plug sediment as the locus of arsenic pollution in Holocene alluvial-plain aquifers

Shallow aquifers in many Holocene alluvial basins around the world have in the last three decades been identified as arsenic pollution hotspots, in which the spatial variation of natural (or: geogenic) arsenic concentration is conditioned by the meandering-river geomorphology and the fluvial lithofacies distribution. Despite the large amount of...

Estimating arsenic concentrations in Bihar (India), a geostatistical approach using DEM data

Bihar is a densely populated area located in the Middle Ganga Plain (MGP) in India. The Ganges' sinuous nature in the MGP created a vast amount of point bar structures within the floodplain. In 2003 it was discovered that high arsenic concentrations are present in the shallow groundwater aquifers, especially in the elevated point bars. According...

Effects of smoothing and regridding in numerical meander migration models

Meander migration models include an as yet poorly investigated source of numerical errors related to the computation of the channel curvature, which are amplified by the procedure of adding and deleting grid points as the river planform evolves. The methods adopted to reduce these errors may influence size, form, and migration rate of the...

Secondary currents and morphological evolution in a bifurcated channel

In studies of flow structures on single-thread meandering rivers, secondary currents have been shown to have a large influence on the morphological development of meander bends. Until this joint study between FAP 24 and the University of Nottingham, UK, there had been few similar studies carried out on the influence of secondary currents on...

Time-dependent near-bank beddeformation in meandering rivers

Due to the relatively high computational costs related to the use of 2D models the purpose of this study was to develop a one-dimensional mathematical model that can give a fair estimation of the near-bank deformation and the bedtopography in meandering rivers. The bedtopography is characterized by a point bar-pool configuration that can also be...