For 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.

New Caledonia's tropical lagoons and coral reefs are one of the three most extensive, highly diverse reef systems in the world. Shown here, a sampling of the multitude of exceptional coral and fish species found there. For the dredging works inNew Caledonia a detailed Environmental Management Plan (EMP) was prepared and its successful implementation proved that good environmental management, which uses both pro-active and re-active approaches, can prevent unnecessary consequences (see page 25).
126
Published March 2012

Terra et Aqua 126 – complete issue

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TASS (Turbidity Assessment Software) has been developed to address a need recognised by the dredging industry that the quality of predictions of the effects of dredging for Environmental Impact Assessments must be improved. Shown here, the results of TASS models are being validated by the Survey vessel Corvus, conducting experiments in the plume of a trailing suction hopper dredger (see page 14).
125
Published December 2011

Terra et Aqua 125 – complete issue

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With both the number of post-Panamax vessels and the demand for Canal transits increasing, the Panama Canal Authority is building new, larger post-Panamax locks. Shown here, the excavation of Pacific Zone 2-South with, left, the Canal and transitting vessels visible.
124
Published September 2011

Terra et Aqua 124 – complete issue

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In the foreground a small elevated platform for geotechnical sampling through a shallow rock seabed and in the background a landing craft for soils sampling in excess of 5 m water depth. conducting a detailed geotechnical site investigation is crucial to the execution of a successful project, therefore, dredging contractors and consultants need to be involved early on so as to avoid expensive “surprises” once work starts (see page 24).
123
Published June 2011

Terra et Aqua 123 – complete issue

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Aerial view of the 6-acre (2.5 ha) processing facility and offices along the banks of the Fox River in northern Wisconsin where a major cleanup project, involving dredging, capping with coarse sand and separating clean sand and dewatering the fine sediments with membrane presses, is taking place in order to remove PCB contamination and restore the natural beauty of the river
122
Published March 2011

Terra et Aqua 122 – complete issue

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The 4,200-km-long River Niger, one of the longest in Africa, meanders through several countries. Dredging and River Training Works on the lower 575 km in Nigeria will regulate the river’s depth there, making it usable for water-borne transport of goods and improving the social and economic lives of the people living along the river (see page 27).
121
Published December 2010

Terra et Aqua 121 – complete issue

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Baltimore Harbor, Maryland, urgently needed a dredged material containment facility (DMCF) as all previous areas were closing in December 2009. With unusual speed, approvals and permits were received in 28 months and work could begin. Shown here: An aerial view of the direct placement of hydraulically dredged onsite-borrow into the dike section at the new Masonville DMCF.
120
Published September 2010

Terra et Aqua 120 – complete issue

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Vulnerable coastlines are often in need of beach nourishment. Shown here, a dredger discharges clean sand acquired at sea onto the beach by pumping through floating pipelines, a method that is economically and environmentally advantageous compared to using quarried sand.
119
Published June 2010

Terra et Aqua 119 – complete issue

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The increasing impact of climate change on the marine environment requires integrated projects, such as the coastal rehabilitation and protection projects pictured here in Vennapuwa, Sri Lanka. This meant rebuilding the revetments with intermittent beach sections, known as the “cove concept”, so that the local fishermen still had landing possibilities for their boats.
118
Published March 2010

Terra et Aqua 118 – complete issue

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The process of selecting suitable rock for the foundation of the breakwater at the port of Poti, Georgia was essential in guaranteeing the integrity of the structure. A drum screen was used for the major quantity of the rock selection, and a wheel loader then loaded the materials onto the road trucks travelling to the various graded stockpiles.
117
Published December 2009

Terra et Aqua 117 – complete issue

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Estimating the Immeasurable: Soil Properties

Authors: Jelmer Braaksma
This IADC Award-winning paper tackles the problem that knowledge of soil properties is essential for an efficient excavation process, but measurement equipment is complex and expensive. Estimation methods using simulators may be the solution.