On the factors governing river morphology with a look on how rivers adapt to climate

River morphology can be described at different scales: at the basin scale we distinguish the river network; at the reach scale the planform, the slope and average features, such as the width and bankfull water depth; at the cross-section scale the transverse variations of river bed topography; and at smaller scales we observe bedforms and...

Revisiting Waal River Training by Historical Reconstruction

The Dutch River Waal, a branch of the Rhine, has been trained for centuries to mitigate the effects of ice-jams and improve navigation. The works, started in 1850, involved river straightening and narrowing by a series of transverse groynes. Besides fulfilling their goal, the groynes also created the need to raise flood protection works and...

Long-term effects of dam operations for water supply to irrigation on downstream river reaches. The case of the Ribb River, Ethiopia

This work investigates the applicability of an analytical method for quick assessments of the long-term morphological effects of different dam operations on downstream river reaches with the idea to apply the method in feasibility studies to identify the least morphologic-impacting operation scenario. The Ribb River (Ethiopia) is used as a...

On the stability of river bifurcations created by longitudinal training walls: Numerical investigation

To maintain a navigable channel and improve high-flow conveyance, engineers have recently proposed constructing longitudinal training walls as an alternative to the traditional transverse groynes. However, previous work has shown that the system of parallel channels created by a longitudinal training wall might be unstable in rivers with...

Long-term morphological developments of river channels separated by a longitudinal training wall

Rivers have been trained for centuries by channel narrowing and straightening. This caused important damages to their ecosystems, particularly around the bank areas. We analyse here the possibility to train rivers in a new way by subdividing their channel in main and ecological channel with a longitudinal training wall. The effectiveness of...

Effect of the barrage and embankments on flooding and channel avulsion case study Koshi River, Nepal

Humans have utilized water resources for millennia by modifying natural river courses and such interventions have greatly influenced not only river flows and sediment fluxes, but also the overall river morphology. Situated in the Nepal's eastern Ganges region, the braided Koshi River is unique among the other rivers, because of the high...

Analysis and modelling of river meandering

This thesis examines the morphological changes of non-tidal meandering rivers at the spatial scale of several meanders. With this purpose, a physics-based mathematical model, MIANDRAS, has been developed for the simulation of the medium-term to long-term evolution of meandering rivers. Application to several real rivers shows that MIANDRAS can...

Hydromorfologische effecten van kribaanpassingen in de bocht van Maassluis: Project Kribben ZH

Eco-morphodynamic processes in the Rhine-Meuse-Scheldt delta and the Dutch Wadden Sea

Description of eco-morphodynamic processes in the Dutch deltas.

Simulation of meandering river processes

A simple mathematical model for the simulation of river meandering processes is presented and analysed. The model is schematized as follows: computation of steady-state flow field and riverbed topography; and computation of bank erosion rate as a function of the near-bank hydraulic and morphological properties. The model is linear for the...

Morphological Response of Rivers to Withdrawal of Water

It is very convenient to make use of rivers as water supply for various purposes, i.e. irrigation, industrial and domestic uses. Even if it is a very common practice, the utilization of river waters must be carefully planned and its consequences analysed. For example, before starting on a new withdrawal of water the need of water supply more...