Effect of Venting Holes to Relieve Wave Impact Pressures on Flood Gates with Overhangs

Flood gates in storm surge barriers or outlet sluices can be prone to violent wave impacts. When an obstruction is present at the sea side above the gate, confinement of the incoming waves can lead to impulsive wave loads, even when the waves are non-breaking. The large loads can increase the stresses in the gate and structure considerably. One...

Wave Impact Pressure-Impulse on Vertical Structures with Overhangs

The study of wave impact physics and magnitudes are key for the design of vertical coastal hydraulic structures. This research addresses the study of standing wave impacts on vertical coastal hydraulic structures with a relatively short horizontal overhang, which is especially relevant for structures such as lock gates, sluice gates, dewatering...

Numerical Evaluation of Design Rules for Non-Breaking Wave Loads on Vertical Walls

This paper describes a numerical evaluation of design rules for the determination of wave loads of non-breaking waves on vertical structures. Design guidelines were proposed by Sainflou (1928) and Goda (1974). These guidelines use geometric parameters of the structure, an incident wave height and a wave period. In practice (cf. CERC, 1984), a...

Measuring (Oblique) Wave Run-Up and Overtopping with Laser Scanners

Wave overtopping is commonly measured using overtopping tanks. In this paper, an alternative system is developed by using two laser scanners. It measures wave run-up, as well as layer thicknesses and front velocities, both during normally and obliquely incident waves on a dike in the field. The paper considers the first field validation tests...

Safety standards of flood defenses

Current design codes like the Eurocode use safety or reliability classes to assign target reliabilities to different types of structures or structural members according to the potential consequences of failure. That, in essence, is a risk-based criterion. A wide range of structures is designed with such codes, and distinction is made between...

Calibration of piping assessment models in the Netherlands

New insights into the failure mechanism piping (under-seepage) regarding the physical process as well as reliability aspects have led to a revision of the Dutch design and safety assessment rules for dikes. This paper describes how the required factor of safety for piping is derived from a top level requirements formulated in terms of an...

The effect of river dunes on the morphodynamic response to overloading

A new two-layer model for conservation of mixed sediment for bedform-dominated condi-tions is proposed. There is a need for such a new bedlayer-type sediment conservation model, as (i) the commonly applied Hirano (1971) model does not account for the effects of bedform stochastics and ver-tical sorting on bed level changes, (ii) the Ribberink...

Untersuchung von instationären Wasserdrücken in porösen Medien (Forschungsbericht)

Auf der Grundlage von zur Zeit noch andauernden Naturmessungen und bisher vorliegenden Ergebnissen aus Modellversuchen im Maßstab 1 : 1 aus den Jahren 1972 bis 1974 sollten die bei schneller äußerer Druckänderung in porösen Medien entstehenden instationären Druckverhältnisse geklärt werden. Hierzu wurden zusätzliche Pilot-Modellversuche in der...

Ausführungsformen von Uferschutzdeckwerken an Binnenschiffahrtskanälen und ihre Langzeitbeständigkeit. Teil 4: Langzeitbeständigkeit von Filterschichten unter losen Schüttsteindeckwerken

1. Veranlassung, Problemsteliung und Ziel der Modellversuche 2. Die Versuchseinrichtungen 3. Versuchsdurchführung und Messergebnisse Die Vermessung der Decklage 4. Die Lageveränderungen der Deckschicht 5. Diskussion der Messergebnisse und konstruktive Folgerungen aus den Modellversuchen

Ausführungsformen von Uferschutzdeckwerken an Binnenschiffahrtskanälen und ihre Langzeifbeständigkeit. Teil 3: Langzeitbeständigkeit asphaltvergossener Schüttsteindecken

1. Veranlassung, Problemstellung und Ziel der Modellversuche 2. Die Versuchseinrichtungen 2.1 Stützkörper (Böschunsunterbau) 2.2 Deckwerke 2.2.1 Filterschicht 2.2.2- Schüttsteindecke 2.2.3 Deckenverguss 3. Versuchsdurchführung und Messergebnisse 3. 1 Lageveränderungen der Deckwerke 3.2 Die Druckverteilung unter Deckwerken aus vergossenen...