Bed-load transportmeter for find sand "Sphinx"

A new bed-load transportmeter has been designed particularly for very fine bed material (below 400 micron). The basic conception is the same as for the so-called Delft-bottle used for measuring transport by turbulent suspension. The instrument is of the flow-through type. The flow enters through a narrow and relatively high nozzle and is...

Application of luminophores in sandtransport-studies

The quantitative determination of bed-material-transport by means of tracers has been considered. For a stationary-stochastical transport-condition the dispersion of tracers has been described by a diffusion-equation of the gradienttype. The parameters of the dispersion-model are derived from the measured concentrations by a least-squares...

Erosion and transport of bed-load sediment

In this thesis first a general derivation is given of the 'macro'-equations of mass- and linear-momentum balance that govern the mo'mentum transfer from a Newtonian fluid to rigid particles in a fluid-solid mixture. In particular, attention is paid to a) the attenuation of viscous-momentum transfer from the boundary to the interior of a granular...

Experiments with non-uniform sediment in case of bed-load transport

An experimental study was carried out in the framework of a research project concerning the development of a mathematical model for morphological computations in rivers in case of non-uniform sediment. The study consists of a series of laboratory experiments in a straight flume under steady, uniform (equilibrium) conditions with a restriction to...

Sutrench model: Two-dimensional vertical mathematical model for sedimentation in dredged channels and trenches by currents and waves

The construction of a tunnel or a pipeline or a new harbour generally requires the dredging of a channel or trench in a river or estuary. Depending on the geometry of the channel, various morphological problems may arise such as sedimentation and erosion of the channel bed, local erosion near the head of the tunnel elements placed in the channel...

Simulation of a curved flume bed-load experiment

The mathematical model for river bend morphology, as developed by Olesen, for bed-load transport is discussed, by comparing the results with some new experimental data. The model consists of a two-dimensional depth-averaged flow model together with a sediment balance and can be used to compute the dynamic river bend morphology. The main purpose...

Sediment mixing coefficient behaviour for different wave, current and sediment characteristics

During the last years, experimental research in the Large Oscillating Water Tunnel (L. O. W. T.) and the Vinje basin (both of Delft Hydraulics) is aimed at the understanding and mathematical description of the process of near-bed sediment transport induced by non-breaking waves. The understanding of the near-bed sediment dynamics is important...

Bodemtransport en duinontwikkeling in de Rijntakken, bodempeilen hoogwater november 1998

Het doel van alle bodempeilingen van duinpatronen tijdens hoogwaters in de Bovenrijn en Waal van de laatste tien jaar was het nauwkeurig be pal en van het bodemtransport met behulp van de duinverplaatsingsmethode (Engels: dune tracking). Vooral de transportverdeling rond het splitsingspunt bij de Pannerdensche Kop had speciale aandacht. Uit de...

The interaction between bed-load transport and dune orientation

Bedforms play an important role in the sediment transport of a river. Because of their importance many experiments have been carried out to better understand bedforms. Most experiments concern transverse bedforms (with crests aligned perpendicular to the flow direction). However, bathymetry measurements show many instances of oblique dunes....

The influence of bivalve shells, of different shapes and sizes, on current-driven sediment transport: Experimental flume study

In the Netherlands, the coastlands act as the principal protection against the sea. Without human interventions, the Dutch coast would be eroding due to an imbalance in the sediment budget of the coastal zone. The preferred coastal management strategy is sand nourishment, which have become larger in scale and more complex over the last 70 years....