An integrated review of river bars for engineering, management and transdisciplinary research

River training and river restoration often imply modifying the patterns and dimensions of bars, channels, and pools. Research since the 1980s has greatly advanced and matured our knowledge on the formation and behavior of river bars, thanks to field work, laboratory experiments, theoretical analyses, and numerical modelling by several research...

Training rivers with longitudinal walls: long-term morphological responses

Rivers have been trained for centuries by series of transverse groynes. This generally results in damages to their ecosystems as well as in undesirable longterm morphological developments. We analyze here the possibility to train rivers in a new way by subdividing their channel in parallel channels with specific functions with longitudinal...

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...

Riverbank protection removal to enhance bar formation for habitat diversity

Over the past centuries natural riverbanks have been transformed into banks with artificial revetments or sheet piles to protect them from erosion, which led to disappearance of important river features for flora and fauna. River restoration projects show that the removal of man-made bank protections may lead to the formation of bars (e.g. Van...

Morfodynâmica do Cabedelo da Foz dor Rio Douro: Perspectiva histórica e monitorizaçao por gps para o conhecimento da sua evoluçao acutal.

The dissertation we proposed to develop comprises, besides an intense bibliographic search, a strong fieldwork component. For the Douro mouth sand spit actual evolution knowledge we had resorted to GPS, technology that allows to obtain precise facts, whose analysis and interpretation have permitted us to infer about the behaviour of this sandy...

Hydro-morphological study Douro estuary part 9: Hydro-morphological mathematical model

As a continuation of the initial study on the morphology of the Douro mouth, performed by Hydronamic in 1982, the Administracao dos Portos do Douro e Leixoes commisioned Hydronamic bv to construct a mathematical hydro-morphological model of the Douro mouth. This second part of the morphological study of the Douro mouth is divided into three...

Morphology of the mouth of the river Douro (Portugal)

The river Douro debouches into the Atlantic Ocean near Oporto (Portugal) with a funnel-shaped mouth, partly closed from the ocean with a sand spit. Both the wave-induced longshore sediment transport as the sediment yield of the river are limited by the available quantity of sediment (non-alluvial conditions). The results of some sediment...

Hydro-morphological study Douro Estuary (7) - measurements

As a continuation of the initial study on the morphology of the Douro mouth performed by Hydronamic in 1982, the Administracao dos Portos de Douro e Leixoes commissioned by Hydronamic bv to construct a mathematical hydro-morphological model of the Douro mouth. Within the framework of the study also a second measuring campaign was commissioned,...

Hydro-morphological study Douro Estuary (8); Analysis of old charts

As a continuation of the initial study on the morphology of the Douro mouth, performed by Hydronamic in 1982, the Administracao dos Portos de Douro e Leixoes commisioned Hydronamic bv to construct a mathematical hydro-morphological model of the Douro mouth. Within the framework of the study an analysis of old charts, available in the archivas of...

Hydro-morphogical study Douro Estuary

The Administracao dos Portos do Douro e Leixoes is confronted with the fact that future expansion of the port area of Leixoes is limited by the surrounding hills and urbanization. One of the alternatives for future expansion might be the creation of port facilities in the Douro estuary, where a relatively large, flat area is available. However,...