Enduring Strength
The long-term effectiveness of posttensioning in bridges depends on the resiliency of the tendons, and various factors related to construction and marine environments come into play. How...
Rebuilding an Island
Following centuries of rising sea levels and pounding waves, almost all of Poplar Island had, by the 1990s, been lost to erosion in the Chesapeake Bay. Today the land is on its way back,...
The Chernobyl Problem
When the infamous accident at the Chernobyl Nuclear Power Plant occurred in April 1986�a catastrophe that involved an explosion that blew off the top of one of the plant's...
Depth Measurement Using Remotely Sensed Data, Specifically A
The compact airborne spectrographic imager (casi) is what is referred to as an imaging spectrometer. This is an optical device that is mounted on an aircraft and used to collect high resolution...
St. George Habor?Berm Breakwater Construction Considerations
During the period 1984-1987 three berm breakwaters with a total length of approximately 800 meters were constructed at St. George Harbor on St. George Island in the Pribil of Chain of...
Strength from Within
After decades of being continuously struck by rockfalls and wayward vehicles, Knapps Hill Tunnel�a highway structure built in 1936 and located on state Route 97A in central Washington...
Repeat Performance
Working with a budget of $10 million, engineers designing a new high-rise residential structure in New York City had to find creative ways to control costs. One budget-saving idea was...
The Inside Story
A full-scale renovation of the interior of Oklahoma City's Civic Center Music Hall required shaving much of the depth from two trusses under load conditions, installing new...
Rhythm of Beachrock Levels in Contrasting Plate Settings: Rifting Red Sea and North American-Caribbean Plates
Sequences of beachrocks have been compared from the northern Red Sea, the North American plate (north shore of Puerto Rico), and an island of the Caribbean plate. In all these areas the...
Characteristics and Implications of Relict Carbonate Paleoshorelines
Throughout the Florida-Bahamas region, the accumulation of coastal carbonate deposits, excepting the present highstand, appears to be episodic. Back through time these deposits provide...
Cliff-Hanger
To create an arch bridge over a river gorge in Oregon without disturbing the canyon walls or floor below, engineers combined a segmental construction scheme with a temporary cable-stay...
High Resolution Pressure Measurements on Roofs of Low Buildings
Describing an instrumented module which was built with extremely high pressure tap density to use as a component of a roof or wall....
Coming to the Surface
In the past few years, the coastal areas of the Gulf of Mexico and much of Texas have experienced less than normal rainfall and record water demands. During this period, average daily...
Big Screen Debut
The Glenn-Colusa Irrigation District (GCID) encompasses nearly 150,000 acres (60,700 ha) of prime agricultural land in California's Sacramento Valley, generally considered...
Evaluation of the CON/SPAN Wingwall System
This evaluation was performed on CON/SPAN Wingwalls, precast concrete end walls for the CON/SPAN Bridge System developed, designed, and supplied by CON/SPAN Bridge System, Inc....
Application of Water Column Dampers to Control Motions of the Wall Centre, Vancouver
The Wall Centre, a 450 foot tall high-rise tower currently under construction in downtown Vancouver will be the highest building to be constructed in that city. Wind tunnel testing indicated...
Design of Structure and Damping System to Control Motions of the Park Tower, Chicago
Park Tower, a 67 story condominium/hotel project currently under construction on the Magnificent Mile, Chicago, IL, will be the first building in North America in recent times that utilizes...
Inside Job
River Mill Dam is a large Ambursen (buttress type) dam constructed in 1911 on the Clackamas River in Oregon. The preliminary and final design phase of the seismic upgrade project coincided...
Mississippi Diversion
The $103-million Davis Pond freshwater diversion project in coastal Louisiana will divert up to 10,650 cfs (300 m�/s) of Mississippi River water to the Barataria Bay Estuary through four...
Growing the Beaches: Restoring the Ventura Coast
The Surfrider Foundation has served as a catalyst for current efforts to restore eroded beaches in Ventura, California through a managed retreat from the shoreline and through watershed...
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