On ice mechanics in ice-induced vibrations

The imminence of anthropogenic climate change has motivated a global energy transition towards sustainable power generation. Offshore wind—an important contributor to the energy transition—is expanding, not only in turbine size and number of installations, but also into regions with harsher environmental conditions. One of those conditions in...

An anchoring system for supporting platforms for wind energy devices

This paper presents data from an initial development stage of an 'umbrella anchor' concept. The anchor can be pushed into sand deposit in a folded arrangement to reduce installation loads. When a pull-out load is applied to the mooring line, the anchor deploys to create a large embedded plate anchor. Physical modelling was carried out in...

Field experiments at three sites to investigate the effects of age on steel piles driven in sand

This paper investigates the influences that steel type, in situ soil properties, water table depth, pile diameter, roughness and driving procedures have on the ageing behaviour of piles driven in sand. Tension tests have been performed on 51 open-ended steel micro-piles, with 48 to 60 mm outside diameter, driven at well-established research...

Finite-element modelling of laterally loaded piles in a stiff glacial clay till at Cowden

The PISA project was a combined field testing/numerical modelling study with the aim of developing improved design procedures for large-diameter piles subjected to lateral loading. This paper describes the development of a three-dimensional finite-element model for the medium-scale pile tests that were conducted in Cowden till as part of the...

Monotonic laterally loaded pile testing in a stiff glacial clay till at Cowden

This paper describes the results obtained from a field testing campaign on laterally loaded monopiles conducted at Cowden, UK, where the soil consists principally of a heavily overconsolidated glacial till. These tests formed part of the PISA project on the development of improved design methods for monopile foundations for offshore wind...

Monotonic laterally loaded pile testing in a dense marine sand at Dunkirk

The results obtained from a field testing campaign on laterally loaded monopiles, conducted at a dense sand site in Dunkirk, northern France are described. These tests formed part of the PISA project on the development of improved design methods for monopile foundations for offshore wind turbines. Results obtained from monotonic loading tests...

New data analysis methods for instrumented medium-scale monopile field tests

The PISA Joint Industry Research Project was concerned with the development of improved design methods for monopile foundations in offshore wind applications. PISA involved large-scale pile tests in overconsolidated glacial till at Cowden, north-east England, and in dense, normally consolidated marine sand at Dunkirk, northern France. This...

The Effect of Shape on the Pull-out Capacity of Shallow Plate Anchors in Sand

This paper presents an experimental and analytical study to investigate the effect of shape on the pull-out capacity of shallow horizontal plate anchors in sand under drained loading conditions. Novel dynamically penetrating plate anchor concepts have been proposed for use in the offshore energy sector. These anchor concepts may have shapes that...

Forensic research into loss of ships by means of a time domain simulation tool

Dune erosion - Product 2: Large-scale model tests and dune erosion prediction method

The dune erosion prediction method presently used to assess the safety level of dunes along the Dutch coast was developed for situations with wave periods up to Tp = 12 seconds, while situations can be expected with wave periods larger than Tp = 12 seconds. Preliminary analyses of the potential influence of longer wave periods on dune erosion...

Dune erosion - Product 1: Deterministic dune erosion prediction methods

The dune erosion prediction method presently used to assess the safety level of dunes along the Dutch coast was developed for situations with wave periods up to Tp = 12 seconds, while situations can be expected with wave periods larger than Tp = 12 seconds. Preliminary analyses of the potential influence of longer wave periods on dune erosion...

Wave action on rubble mound breakwaters: The problem of scale effects

The present report, produced within the framework of the EU funded project DELOS, attempts to recognise and analyse main scale effects in the physical modeHing of rubble mound breakwaters used in offshore and coastal engineering. Scale effects appear in physical modeHing because the ratios between the farces of interest, as present in prototype,...

ERCOFTAC Workshop on Data Bases and Testing of Calculation Methods for Turbulent Flows

This document contains the calculation results for 5 test cases and the description of calculation methods submitted to the ERCOFTAC Workshop on Data Bases and Testing of Calculation Methods for Turbulent Flows held in Karlsruhe from April 3 to 7, 1995. The workshop was an outcome and marked the end of the research project "Data Validation and...

Human factors considerations in evaluating the seakeeping performance

Model tests for manoeuvring preditions of SWATH configurations 6A1 and 6A2

Symposium "Research on wave action": Proceedings, Delft Hydraulics Laboratory, Delft, The Netherlands, July 1969

Contains papers and discussions of the symposium: de Jong, J. - New wind waves flumes; Wiegel, R.L. - Waves and their effects on pile-supported structures; Svasek, J.N. - Statistical evaluation of wave conditions in deltaic areas; d'Angremond, K. and Van Oorschot, J.H. - Generation of irregular waves on model scales; Rogan, A.N. - A comparison...