Long-term morphological modelling of the mouth of the Columbia River

With the construction of a process-based long-term morphological model (Delft3D) for the Mouth of the Columbia River (MCR), a first approach is made in trying to simulating the long-term morphodynamics of the MCR. Focus is on simulating the observed morphological changes for the post-jetty period of 1926-1958. The model is supplied with a high...

Modelling nearshore currents driven by waves and set-up gradients

During the fall of 2003, an extensive measurement campaign called the “Nearshore Canyon Experiment” (NCEX) was set up along the coast of La Jolla, California. The project site covered an area in which two submarine canyons are located, respectively La Jolla and Scripps Submarine Canyon. Over 20 institutions collaborated on recording the...

Modeling the interaction between morphodynamics and vegetation in the Nisqually River estuary

Due to growing human activity in coastal zones, there is an increasing stress on salt marshes all over the world. These intertidal wetlands were often seen as coastal ‘wasteland’ and large areas were reclaimed for urban development and agriculture. In Puget Sound, a system of interconnected marine waterways and basins in the northwest of the...

Modeling the hydrodynamics and salinity of the Pontchartrain Basin

The area of New Orleans was hit by Hurricane Katrina in August 2005. A large part of the city got flooded due to bad design, construction and maintenance of the levee system. In order to increase the level of protection of the city, the levees are heightened and strengthened in the framework of the Hurricane and Storm Damage and Risk Reduction...

A fundamental study of the Morphological Acceleration Factor

Long-term prediction of sediment transport and morphology has become increasingly important. One of the key issues in carrying out long-term modeling is to bridge the gap between short-term hydrodynamics varying from hours to days, and morphological changes, taking place over much longer periods. Lesser et al. (2004) and Roelvink (2006) have...

Cross-shore morphological response on Chaland Headland due to Hurricanes Gustav and Ike

Numerical modeling of sediment transport over hydraulic structures

Hydraulic structures are present in the designs of different Room for the River projects in the Netherlands. Examples are longitudinal weirs, groins, summer dikes and weirs in the inlet of a side channel. Morphological simulations with Delft3D are frequently carried out to investigate the effect of such projects on for example hindrance for...

Morphodynamic modelling of the Galgeplaat

Since the completion of the Eastern Scheldt project in 1987, in the south-western part of The Netherlands, there has been a decrease of tidal volume, range and current in the Eastern Scheldt estuary. This has led to morphologic changes in the basin. The channels are in demand of sediment and as the Eastern Scheldt barrier itself blocks most of...

The evolution of sandbars along the Colorado River downstream of the Glen Canyon Dam

The Colorado River in the Grand Canyon area has a lot of sandbars but they are eroding. Since the building of the Glen Canyon Dam and the Hoover Dam in the 1960s, sediment is trapped in the upstream lake. The inflow of water is clear, cold and nearly sediment free. The only noticeable remaining inflow of sediment in the Colorado River is by two...