For nearly 50 years and more than 160 issues, Terra et Aqua has benchmarked innovative maritime solutions. Articles are available here as well as in IADC’s Knowledge Centre.

Permeable dams being constructed by locals in Demak, central Java, Indonesia to restore the eroding mangrove-mud coast in the region to prevent flooding.
144
Published September 2016

Terra et Aqua 144 – complete issue

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Building with Nature: Sustainable Protection of Mangrove Coasts

Building with Nature is an innovative approach that combines natural processes with innovative engineering methods to realise sustainable projects. Permeable dams are being utilised as part of a Building with Nature solution to help restore the eroding mangrove-mud coast of the Demak district in central Java, Indonesia.

LuXeal – The Easy to Handle Watertight Mixture

Dredging works in the Juliana Canal in the Netherlands is currently being carried out and as part of the widening works, a new watertight layer has to be constructed. The contractor has decided on utilising a new and innovative watertight bentonite mixture, LuXeal, to prevent water leakages in the surrounding areas
A panoramic view of multiple dredgers at work at the New Suez Canal. The project involved the largest number of dredgers ever deployed on a single project – 28 vessels and over 40 pieces of auxiliary equipment (Page 5) (Photo by Luuk Kramer; Courtesy of Challenge Consortium).
143
Published June 2016

Terra et Aqua 143 – complete issue

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How Clear Communications Benefit Dredging Projects

Dredging projects impact a wide variety of stakeholders. Over the years dredging contractors and clients have become more aware of the public’s need for information. Keeping clear communications open with all stakeholders, especially the public can benefit dredging projects.

Safety in Mooring

Authors: Bram Sluiskes
The risks of mooring operations in the dredging industry cannot be overstated. Equipment, training and competence of personnel, and technology are the different factors that play a part in safe and efficient mooring work.
Dredging in rock can cause wear and tear and so cutter teeth needs to be replaced regularly. Efficient rock cutting is still a challenge facing the dredging industry especially since it is mostly an underwater process. Find out about a new developed method to improve rock cutting processes.
142
Published March 2016

Terra et Aqua 142 – complete issue

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Fair contract conditions and competition

Authors: David Kinlan
FIDIC Conditions of Contract books are essential to the dredging industry. There is a whole suite of contracts for stakeholders to choose from to suit their needs. Discover when and why these contracts were made.
UXO (unexploded ordnance) present a safety risk to dredging vessels. Experts use various specialised tools to locate and salvage munitions. Shown here from left to right, a Heavy-Duty Work Class Remotely Operated Vehicle (HD-WROV), a towfish with gradiometer and an electromagnet for salvaging (page 15).
141
Published December 2015

Terra et Aqua 141 – complete issue

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A satellite photo shows Horseshoe Bend on the lower Atchafalaya River in Louisiana, USA where an island is being self-designed by strategically placing dredged sediment upriver and allowing the river’s energy to disperse the sediment, contributing to the natural growth of the island (Photo: Wings of Anglers).
140
Published September 2015

Terra et Aqua 140 – complete issue

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Although modern dredging vessels have undergone great advances in horizontal and vertical dredging accuracy, many variables remain. These can result in the need for overdredging. If financial expectations about overdredging are not specified in the contract, conflicts may arise.
139
Published June 2015

Terra et Aqua 139 – complete issue

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A long-reach excavator unloads sediments placing them over a vibrating sieve, after which the high-density material is pushed through a pipeline to the additive mixing unit. In this way, dredged material is reused and is engineered to build dykes.
138
Published March 2015

Terra et Aqua 138 – complete issue

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A bucket dredger working in the Baltic Sea near Riga, Latvia. Both the Baltic Sea and the North Sea are SOx Emission Control Areas (SECAs). Dredging vessels in SECAs will have to comply with stricter fuel emissions standards as of January 1, 2015 (see page 14).
137
Published December 2014

Terra et Aqua 137 – complete issue

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The CO2-related aspects of a dredging project are quite significant. The Sand Motor, shown here, was built on the Dutch coast and required extensive sand excavation which uses an enormous amount of energy. It is one of four projects being studied to develop a design tool aimed at calculating the CO2 footprint over the lifecycle of a project and do it from the start, in the design phase (see page 16).
136
Published September 2014

Terra et Aqua 136 – complete issue

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(Cover) Building 41 km of causeways and 25 drilling islands at the Manifa Oil Field in Saudi Arabia required huge quantities of rock. Amongst other innovative techniques, hydraulically created sand bunds were finished by using extra-long reach excavators from the land side to install a slope protection of a rock underlayer installed on heavy duty geotextile.
135
Published June 2014

Terra et Aqua 135 – complete issue

Read the complete issue containing articles, upcoming events, an interview and book review.