Improving culvert performance: Reducing energy losses by streamlining the entrance and exit of culverts.

In Dutch polders, numerous structures like bridges, weirs, culverts, and pumping stations have<br/>been constructed over centuries to manage water levels. These structures play a crucial role in<br/>maintaining water levels within predefined targets. The flat topography of the Dutch landscape<br/>combined with the collective impact of head...

The Maximum Effect of Wind on Wave Overtopping at Rubble Mound Breakwaters with the Influence of the Slope and a Crest Element

The impact of climate change, particularly the rise in sea levels, obstructs the effectiveness of existing coastal structures. Additionally, climate change can also have an amplifying effect on wind speeds (Takagi &amp; Esteban, 2013). Without proper control, the accumulation of changing environmental boundary conditions could lead to disastrous...

Dynamic Tidal Power: Spatial analysis and feasibility study

In 2008, a new concept to extract tidal energy was introduced called Dynamic Tidal Power (DTP). In this concept, the natural tidal wave propagating along a coastline is blocked using a long dam, inducing a water level difference between both sides of the dam. This water level difference, called the hydraulic head, can be exploited by placing...

Stainless steel in lock gates: Mitre gate optimisation based on a compressed arch structure for the application of stainless steel

Gates are an essential part of navigational locks, as they are responsible for creating a water barrier and can be repositioned to allow passage for maritime transit. Most lock gates are made of steel but a recent project in Sweden challenged the status quo by constructing the first stainless steel lock gate. The main question of this thesis...

Wave Transmission over Artificial Reefs: A Physical Model Study

In this research, the influence of the permeability and the porosity of artificial reefs on wave transmission and the sheltered habitat of marine life is investigated. A physical model is used to find the answer to this question. <br/>The main finding of this research is that a hollow, perforated structure can act both as an artificial reef that...

The maximum wind effect on wave overtopping at dikes with crest elements

Climate change affects sea level rise and the safety of the people living behind seadikes. In order to prepare for this, several adaptation measures are available to reduce the overtopping discharge. Wave overtopping can be reduced by including roughness elements or adding a berm. Another possibility is to employ crest elements such as a...

Numerical investigation of plastic fragment accumulation against a sluice gate

The ramifications of plastic pollution on the environment are becoming increasingly serious in various forms throughout the world. In this context, rivers are the most important suppliers of plastics entering the marine environment. However, rivers that contain high loads of plastic waste also directly harm the livelihoods of people living near...

Compound weirs: Analytical and experimental research on stage-discharge relations

Two control structures in the form of compound weirs were built near Pannerden and in the Hondsbroeksche Pleij. These compound weirs consist of multiple adjacent gates with individually configurable weir heights. To make optimal use of the flexibility of the structures, research must be done into how different compound weir configurations affect...

Conceptual Design of the Spillway into the Energy Storage Lake of Delta21: Part of a new approach to improve the flood protection in the Southwest Delta of the Netherlands

In the upcoming decades, the Netherlands is going to face challenges regarding the protection against flooding. The reason for this is the expected rapid change in climate around the world. As a result of the changing climate, the sea levels rise and the peak river discharges increase. These changes lead to higher water levels in the Dutch...