USE OF X-RAYS AND QGIS® SOFTWARE TO EVALUATE DETERIORATED WOOD IN MARINE ENVIRONMENTS

The objective of this work was to propose a nondestructive method to identify and quantify the damage caused by marine borers in wood structures. First, a test specimen was submerged in an estuarine environment for 120 days. Radiography was then applied to detect and evaluate the attack by marine borers. Two methods of evaluation were performed with the images to compare them. The first assessment was carried out using the QGIS® geoprocessing program for the treatment of images as a tool, which made it possible to identify and quantify the damage (in cm²). The second evaluation followed the method indicated in EN 275 (1992), which suggests a visual assessment, based on X-ray images, classified according to a template provided in the standard. Although the method using the image treatment by QGIS® is an estimate, it has the advantage of providing a numerical result, in contrast to the visual analysis, which is not as accurate due to its subjectivity. Besides this, the treatment of the images allowed good visualization of the damage to the specimen. The findings indicated that QGIS® can be used as a complement to the method proposed by EN 275 (1992).

An Upper Cretaceous paleodrainage system on the Coastal Plain unconformity of Alabama-Georgia

ABSTRACT Rocks of the Upper Cretaceous Tuscaloosa Formation (Cenomanian) and Eutaw Formation (Santonian) in southwestern Georgia and southeastern Alabama record an interval of fluvial and nearshore marine deposition. In the vicinity of Columbus, Georgia, basal units of the Tuscaloosa Formation consist of a residual paleosol built on crystalline rocks of the Appalachian Piedmont covered by conglomeratic sandstones deposited in braided stream systems flowing across the mid-Cenomanian Coastal Plain unconformity. The unconformity, which separates Cretaceous detrital rocks from underlying metamorphic rocks and residual paleosols built on those metamorphic rocks, lies primarily within the Tuscaloosa Formation in this region and is marked at the modern surface by the geomorphic Fall Line. Mapping of the unconformity across the region reveals areas of significant paleorelief associated with a number of distinct paleovalleys incised into the mid-Cenomanian surface. The most distinct of these lie immediately east of the Alabama-Georgia state line, within 15 km of the modern Lower Chattahoochee River Valley. Spatially, these distinct paleovalleys lie immediately north of a Santonian estuarine environment recorded in the Eutaw Formation, disconformably above the Tuscaloosa Formation. Collectively, paleo-valleys in the mid-Cenomanian surface, the fluvial nature of the Tuscaloosa Formation in southwestern Georgia and southeastern Alabama, and the estuarine environment in the younger Eutaw Formation suggest a persistent (~10 m.y.) paleodrainage system that may be a forerunner to the modern Chattahoochee River.

The Crab House on Oyster Creek: Folkloristic Response to Vernacular Landscape and its Environmental Moorings

The Andersen crab house on Oyster Creek is located on a waterway that is part of the wider estuarine environment consisting of New Jersey’s Great Bay and the Mullica River. It is a building type that has long served oystermen, clammers, crabbers, finfishers, and waterfowlers along New Jersey’s Atlantic Ocean and Delaware Bay coastlines. Having survived for almost ninety years, the building’s siting allows Phil Andersen to effectively tend the adjacent crabbing grounds and prepare the catch for market. The building, along with his boat and harvesting gear organizes the contours of his working landscape, tools that do not simply define the occupation’s environmental fit, but, as an assemblage, continually advance Andersen’s acquisition of traditional ecological knowledge. While its stark presence on the salt marsh punctuates its environmental fit and role as the axis of Andersen’s occupational map, its enduring function as a working landscape resonates widely throughout the community. The work and social life of the building speak to its capacity to be broadly affiliative, its features, use, and siting laden with aesthetic and performative depth that make it a touchstone of environmental experience and sense of place. These attributes—specifically their role in curating memory and affirming a community’s environmental moorings—show how the Andersen crab house, and similar buildings that preceded it, have engendered folkloristic response for over one hundred and fifty years.