The sediment capture efficiency of a managed realignment polder

The Ems Dollart estuary is facing high levels of turbidity, which hinders the growth of algae and impacts the entire ecosystem. In recent years, turbidity has increased here with 0.5 to 3% per year between 1990 and 2010, corresponding to a doubling of suspended sediment concentration (SSC) within 24 years for the upper bound of 3%. This trend is...

Hydrodynamic and morphodynamic response of Perkpolder after a managed realignment

A managed realignment is the landward relocation of a flood defence to re-establish tidal exchange on formerly reclaimed land. In a managed realignment, the newly formed intertidal area acts together with the realigned dike as a nature-based flood defence system. In this thesis, the focus is on the managed realignment of Perkpolder, a former...

Channel Network Morphodynamics in the Lower Paraná Delta: Modelling the Influence of Natural Processes and Anthropogenic Activities on Morphological Changes in the Lower Paraná Delta Channel Network

The La Plata Basin is the second largest drainage basin in South America. The Paraná River, the basin’s main river, discharges into the Río de la Plata estuary in Argentina. In the Lower Paraná Delta, near the deltaic front, a complex system of mostly natural and some man-made channels redistribute a part of the river flow. Like the river and...

The application of a continuous nourishment in a tidal inlet system: Case study Ameland Inlet

There is a demand by Rijkswaterstaat for CO2-neutral sustainable methods and technologies to maintain the Dutch coastline. The Zandwindmolen is a fixed CO2-neutral dredge, transport and nourishment concept that nourishes sediment continuously. The purpose of using a Zandwindmolen is to provide the entire surrounding area where the Zandwindmolen...

Tidal control in the Lower Ems: An indicative study into the effects of controlled barrier operation on the tidal asymmetry in the Lower Ems river

The lower Ems river suffers from hyper-turbid conditions. These conditions are caused by channel deepening over the last 50 years, resulting in an asymmetrical tidal wave. This asymmetry has resulted in an increased<br/>import of sediment into the Ems river. Recently some effort has gone into determining whether or not the local tidal barrier ...

Investigating the impact of two submerged sills on the physical habitat of Yangtze finless porpoise in Hechangzhou reach, China

As Chinese economy booms during recent decades, river management attains more investment, and is required to develop more rapidly for flood defense as well as facilitating navigation, which brings a lot of changes and threat to most of aquatics, especially those endangered species. Yangtze finless porpoise is one of those...

Impact of a port and its structures on the morphodynamics of a tidal basin and its adjacent coast: A case study of Bluefields Bay, Nicaragua

To improve the socioeconomic situation in the Republic of Nicaragua, the government has decided to strengthen the country’s transport infrastructure by building a port on the Caribbean coast. The future port will be in Bluefields Bay, which can be characterised as a lagoon-shaped estuary. The inner basin is connected to the sea by two tidal...

Mixed Sediment Dynamics at a Tide-Dominated Confluence: A case study on the Yangon Estuary, Myanmar

This thesis research has been conducted to analyse the sediment dynamics in the Yangon Estuary, in order to define the cause for the sedimentation in Monkey Point Channel. For years, Yangon Port has been suffering from limited accessibility due to the sedimentation in the channel and currently daily dredging is required in order to let ships...

Constructed Tidal Marshes: An analysis on how model configurations influence accretion

Along river banks, on the transition zone between the river and see, tidal marshes can develop. The tidal marshes accommodate multiple plant and fish species. As a result of the stressful conditions in tidal marshes, unique intertidal ecology develops. However, due to the densifying of the river banks, tidal marshes are disappearing. <br/...

Siltation Mitigation In A Data Poor Environment: Assessing The Influence Of A Sluice On Siltation Rates In The Nga Moe Yeik Creek, Yangon

The typically mild slopes of the muddy coastline in the south of Myanmar, enable the tide to propagate deep into the mainland, carrying muddy and saline water. The Nga Moe Yeik Creek (a tributary of the Yangon River) is closed off at the upstream end during the dry season and is subject to high siltation rates. Extensive dredging is necessary to...

On physical oceanography of the Santos Estuary

This thesis investigates the origins of large sedimentation volumes in the Port of Santos, São Paulo - Brazil. The port is located in the Santos - São Vicente estuarine system, delimited by scarps and subject to intense rainfall. The terminals are placed inside the estuary and their access is provided by a 24 km long channel with mean depths of...