Category Dredge

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DredgeFest Louisiana

Geographer Richard Campanella has evocatively described the Mississippi River—which is North America’s largest river, discharging more than three times as much water as the next largest river in the United States—as the “land-making machine”. And, indeed, historically, this is what the Mississippi River did: it made land, building its enormous delta—the southern half of the […]

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Massively Redistributed in Space and Time

“If the earth were left alone [without human influence] on the order of eight cubic kilometers (10.5 billion cubic yards) of the material of the continents would be swept away by rivers into the ocean every year…By some estimates, about a third of this natural volume is prevented from reaching the oceans as a result […]

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Singularity | Error | Spillover | Feedback

Anthropogenic Delta of Lake Mills Reservoir, Elwha River, Washington.  Above: inset model on the left shows the valley’s topography as surveyed circa 1917 before the construction of Glines Canyon Dam.  The model on the right shows topographic difference (in vertical feet) between the 1917 survey and 2010 LIDAR and Bathymetric survey data (Bureau of Reclamation), […]

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Soft Systems: Bracket 2

Located in the Chesapeake Bay, Poplar Island (above) is a flagship example of the USACE’s “beneficial uses of dredge”. Working with state and federal organizations, the USACE has been placing dredged sediments from The Port of Baltimore’s shipping channels onto the island since the mid-90’s.  This practice meets the Port’s immediate need for a dredge […]

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Making the Geologic Now

[Aerial view of Amwaj Island, Bahrain, where 2.79 million square meters have been reclaimed from the sea.  The foundation of these islands and its surrounding breakwaters are made of geotubes, sausage-like casings of geotextile fabric that have been pumped full of 12 million cubic meters of dredged ocean sediments recycled from navigation channels and marinas.  […]

manahatta cut and fill history

Invitation to DredgeFest NYC

[Left: The British Headquarters Map, circa 1782, considered one of the most detailed surveys of Mannahatta's early topography and ecology. Right: Mannahatta map illustrating the differences in the island's elevation between 1609 and today. Grays and blacks indicate increases in elevation, mainly waterways that have been filled in, while browns indicate decreases in elevation, such […]

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Building Land to Know How It Erodes Away

[Top image: Sediment-thickness map, showing thickness of the sand deposit at Hewes Point, north of the Chandeleur Island chain. Sand used to construct the E-4 berm was excavated from the side of the deposit, about 3 kilometers north of the islands. Bottom: Photograph taken on April 13, 2011, of the completed E-4 berm, detached from […]

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Columbia Migrations: Dredge Oregon

[a hand-crafted steel cutterhead of the Dredge Oregon.  The specular silver sheen on the backside (click on image for detail) is a nickel plating added to extend the life of the cutter as it rips and churns through the shifting sediments of the Columbia River.] Back in February of this year I  had the opportunity […]

Canal Works

Dredge Acts of 2012

[In process earthworks (new locks) as part of the Panama Canal Expansion] “There is neither a single issue nor solution to how to prepare for future maritime transportation infrastructure needs… There is a plethora of studies, opinions and prognostications about what the effects of the new [Panama Canal] locks will be on trade flows, ship […]

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River was: 34,131,100 points

The U.S. Geological Survey recently posted a LIDAR fly-through of what the Lower Elwha River looked like as of September 2011.  The composite of 97 on-the-ground LIDAR scans were made less than a week before the start of dismantling the Elwha and Glines Canyon Dams upstream.  The 34,131,100 georeferenced points of light will serve as […]

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