Estimating P-and S-Wave Velocities in Fluid Mud Using Seismic Interferometry

Fluid mud plays an important role in navigability in ports and waterways. Characterizing and monitoring the seismic properties of the fluid mud can help understand its geotechnical behavior. Estimation of the wave velocities in fluid mud with high accuracy and repeatability enables investigating the behavior of parameters like the yield stress...

Influence of re-circulation dredging on fluid mud dynamics in seaport emden

Maintenance of the nautical depth in the seaport of Emden, Germany, is achieved by re-circulation of fluid mud using a trailing suction hopper dredger. Continued re-circulation has proven to maintain low settling rates and to keep yield stresses of re-circulated fluid mud below 50-100 Pa, in combination with densities of 1.15- 1.2 t/m³ enabling...

CFD simulations of the flow around a tanker in shallow water with muddy seabed

Reducing dredging activities in the harbors brings benefits both economically and environmentally. However, this means that ships may have to sail very close to or even through the mud layer on the seabed, with possible effects on ships’ resistance and manoeuvrability. This study has made a step in understanding these effects on ships’...

Advances in Maintenance of Ports and Waterways: Water Injection Dredging

The main objective of this chapter is to demonstrate developments in port maintenance techniques that have been intensively tested in major European ports. As regular port maintenance is highly expensive, port authorities are considering alternative strategies. Water Injection Dredging (WID) can be one of the most efficient alternatives. Using...

Monitoring of settling and consolidation of mud after water injection dredging in the Calandkanaal

As regular maintenance and relocation of sediment deposits are highly expensive, Port authorities seek more efficient solutions for reducing the costs and CO2 emissions of maintenance dredging. One solution, water injection dredging (WID), is carried out for maintaining the sediment deposits which predominantly consist of clay and silt. WID has...

Dynamic Response of the Fluid Mud to a Tropical Storm

Fluid mud (FM) is a unique sedimentary feature in high-turbidity estuaries, where it can make a rapid contribution to morphodynamics. Insufficient field measurements and fixed-point monitoring lead to deficient understandings of the formation, transport, and breakdown of the FM under extreme weather conditions. A field survey was conducted in...

Seismic analysis of fluid mud: Detection of shear parameters in fluid mud and the relation between seismic velocities and yield stresses

In this research, a new measuring method to detect shear parameters in fluid mud is proposed, namely using shear waves, or S-waves opposed to the conventional pressure waves, or P-waves. Currently, detecting fluid mud is done by the use of P-waves. This paper shows that conventional P-waves velocity measurements are unsuitable for linking...

Wave-Driven Set-Up of Fluid Mud: Demak, Indonesia

Demak is a regency within the province of Central Java, Indonesia, with a mud-mangrove coast bordering the Java Sea. The region is facing a rapid retreat of the coastline, threatening the livelihood of a large part of the population. The main cause of the erosion is the deforestation of the green belt of mangroves. This has disturbed the...

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...

Estimating the roughness of muddy beds: A study based on in-site measurements and numerical modeling

Bed roughness is an important parameter for the prediction of sediment transport as well as calculating flow conditions near the bed. Numerical models are extensively used to make these predictions. In these models it is fundamental to have proper values for bed roughness. The bed roughness is being estimated using a dataset from an ongoing...

Modelling wave damping by fluid mud: Derivation of a dispersion equation and an energy dissipation term and implementation into SWAN

On numerous locations in the world mud occurs in front of the coast close to river mouths. This mud can be transported to these places in fluid state or can become fluid under certain wave conditions. Fluid mud may have a strong damping effect on surface waves. Dissipation of up to 90% of the wave energy within a few kilometers has been measured...

Jetten in slib ten behoeve van waterinjectie baggeren

Waterinjectie baggeren (WIB) is een baggermethode die slechts vijftien jaar geleden is bedacht en ontwikkeld. Door middel van een patent is HAM nu nog steeds het enige baggerbedrijf dat deze winstgevende methode mag toepassen. Grote voordelen van de methode zijn de natuurlijke methode van transport door middel van zogeheten dichheidsstroming en...

Erosion of a fluid mud layer due to entrainment: Numerical modelling

A continuous transport cycle of mud material can be noticed in a natural water environment. Aggregation, settling, deposition, consolidation and erosion are typically interlinked. These processes are influenced by the cohesive properties of the mud and by the characteristics of its environment. Fluid mud is a highly concentrated near-bed...

Waterinjectie baggeren, een vernieuwde modellering

Tijdens het waterinjectie baggeren treden verschillende processen op. Om te beginnen wordt water met behulp van het baggerwerktuig in de bodem van het te baggeren gebied geinjecteerd, vandaar de naam waterinjectie baggeren. Vervolgens treedt menging van het water uit de straal met bodemmateriaal en omgevingswater op. Op deze manier ontstaat een...