Search inside publication
The new Delta Flume for large-scale testing
The new Delta Flume in Delft was constructed to facilitate large-scale physical model testing. The new Delta Flume has a length of about 300m, a width of 5m and a height of 9.5m. The maximum significant wave height that can be generated is about Hs = 2.2m and maximum individual wave heights in the range between Hmax = 4m and 4.5m. This unique facility enables physical modelling at prototype-scale or at close-to-prototype scale. Preventing or diminishing scale-effects is especially important for coastal structures in which sand, clay, grass or other natural construction material is being applied. Besides projects with dikes and dunes, structures such as breakwaters, bed protections, monopiles, offshore wind farms, and storm surge barriers are scheduled to be tested. Along with new facilities also new measurement techniques have been developed, both for the new Delta Flume and for the other wave facilities (e.g. wave basins). The new Delta Flume completes a set of wave facilities for physical model testing consisting of small and large-scale test facilities and 2D (wave flumes) and 3D (wave basins) facilities.
Machine data and the quality of screw displacement piles
During the installation of piles, data are gathered which allow the machine operator to make decisions. These data about the process parameters for screw displacement piles can be used by other people and in different phases of the project, reducing the discrepancy between the levels of attention devoted to the design and the installation phases of pile foundations. In this project, pile installation databases and expert knowledge were combined in a Bayesian belief network approach to take all the information into account in a systematic way and to infer the quality of the installed piles.
Cone penetration tests in layered soils
Cone penetration testing (CPT) is used widely to determine the geotechnical engineering properties of soils and to analyse the stratigraphy. However, it is hard to estimate a representative value for cone resistance when thin layers of sand and clay or peat alternate because the surrounding layers affect the measured cone resistance and result in an average value. The effect of multiple thin alternating layers is being studied in the laboratory in Delft.
Aging pipes in underground networks
Underground networks for wastewater and drinking water are aging and effective asset management is required. This means quantifying the actual functionality and structural condition of the pipes, preferably using non-destructive methods. With this goal in mind, a group of companies, water authorities, municipalities, Deltares, Delft University of Technology, STOWA and RIONED joined forces in the Urban Drainage Knowledge Programme and set up an STW-funded research programme TISCA: Technology Innovation for Sewer Condition Assessment. A major aim of TISCA is to obtain information about hydraulic capacity and structural strength using non-invasive methods for existing infrastructure.
Smart thermal grid at Delft University Campus
Delft University of Technology wishes to be a prime example of an academic campus with energy efficiency measures and sustainably sourced power. One of the areas being investigated is the district heating system (DHS) at the campus. A model predictive control (MPC) system will be required that determines the minimum supply temperature and optimal use of the different sources. This MPC system is based on two simulation packages. The first is Low Energy Architecture (developed by Deerns), which can be used to minimise the supply temperature while providing a comfortable climate inside the building. The second is the Deltares Wanda package, which can be used to simulate hydraulic and thermal transients in pipeline systems like a DHS. Wanda is used to determine the source usage and required supply temperature on the basis of the results of the Low Energy Architecture simulation for optimal source usage with minimal carbon dioxide output.
Improving the navigability of the Lower Old Danube in Romania
The Danube has been designated a Priority Axis, a pan-European inland transport link from the port of Rotterdam on the North Sea to the port of Constanta on the Black Sea. In Romania, the Danube covers 1075 kilometres from its point of entry at Bazias to the mouth at Sulina. Several studies have been conducted in recent years and recommendations have been made to improve the navigation conditions on the Danube between Calarasi and Braila. The aim of the present project is to evaluate alternatives for improving navigability. In order to provide sound recommendations, we developed two different models: a detailed 3D hydrodynamic model for the Bala bifurcation, and a large-scale quasi-3D morphodynamic model for the Danube branches. The models were used to simulate and analyse two scenarios for improving navigability by comparison with the benchmark condition.
New guidelines for inland waterways in the Netherlands
Waterway guidelines are key to safe, reliable, and efficient navigation in the Dutch waterways network. The present waterway guidelines are restricted to canals. In recent years, Deltares, MARIN and Rijkswaterstaat have been developing a set of rules that will allow the guidelines to be applied to the complete waterway network, including the river systems. These rules are based on the in-depth analysis of the hydrodynamic and morphological conditions, and the manoeuvrability of inland vessels. A unique combination of numerical simulations and statistical data analysis models that uses heterogeneous sources of information (about factors such as ship manoeuvring, experience from the field or physical models) ensures the best possible assessment of waterway guidelines (which include factors such as the cross-sectional profile of navigation channels, bend radius and port entrances).
Innovations in breakwater design
OCP, a global leader in the phosphate and phosphate derivatives markets, is planning a new dry bulk facility off the western coast of Morocco at Laayoune. As part of this project, Royal HaskoningDHV prepared the preliminary design of an offshore breakwater to protect the dry bulk facility. Deltares then verified stability and overtopping performance using 2D and 3D physical models which allowed the optimisation of the design of the offshore breakwater.
Optimising coastal structures with numerical modelling
The joint industry project (JIP) Coastal Foam focuses on the development of numerical tools to predict the stability of various components of coastal structures, and particularly on the open source CFD-toolbox OpenFoam. One of the studies looked at open filters in which rock material is placed on top of a sand core. Another area studied was slamming loads from breaking waves on crest wall elements.
Monitoring the quality of railway tracks from space
Subsidence can play a key role in the performance, serviceability and safety of engineering works such as railway embankments. Research by Deltares in 2007 indicated that 40% of the maintenance costs for railways in the Netherlands are linked to preserving the geometry of the railway track. Deltares developed a predictive settlement model for railway embankments built on soft soils. The main achievement of this project is the stochastic prediction of secondary settlement using satellite data and subsoil data. This prediction will improve the assessment of the quality of railway tracks in the long term and help to rationalise existing monitoring campaigns.