Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 6 of 6
Full-Text Articles in Engineering
Is There Synchronicity In Nitrogen Input And Output At The Noland Divide Watershed, A Small N-Saturated Forested Catchment In The Great Smoky Mountains National Park, H. Van Miegroet, I. F. Creed, N. S. Nicholas, David G. Tarboton, K. L. Webster, J. Schubzda, B. Robinson, J. Smoot, D. W. Johnson, S. E. Lindberg, G. Lovett, S. Nodvin, S. Moore
Is There Synchronicity In Nitrogen Input And Output At The Noland Divide Watershed, A Small N-Saturated Forested Catchment In The Great Smoky Mountains National Park, H. Van Miegroet, I. F. Creed, N. S. Nicholas, David G. Tarboton, K. L. Webster, J. Schubzda, B. Robinson, J. Smoot, D. W. Johnson, S. E. Lindberg, G. Lovett, S. Nodvin, S. Moore
Civil and Environmental Engineering Faculty Publications
High-elevation red spruce [Picea rubens Sarg.]-Fraser fir [Abies fraseri (Pursh.) Poir] forests in the Southern Appalachians currently receive large nitrogen (N) inputs via atmospheric deposition (30 kg N ha(-1) year(-1)) but have limited N retention capacity due to a combination of stand age, heavy fir mortality caused by exotic insect infestations, and numerous gaps caused by windfalls and ice storms. This study examined the magnitude and timing of the N fluxes into, through, and out of a small, first-order catchment in the Great Smoky Mountains National Park. It also examined the role of climatic conditions in causing interannual variations in …
Lessons From Roman Cement And Concrete, Norbert J. Delatte
Lessons From Roman Cement And Concrete, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
Although masonry and lime mortars had been used for centuries by earlier civilizations, the Romans were the first to extensively use naturally occurring volcanic earth to make hydraulic cement. The volcanic powder named “pulvis puteolanis,” found near the town of Puteoli near Naples (now Pozzouli), was used to build magnificent structures. The use of this hydraulic cement in masonry and concrete greatly expanded civil engineering possibilities. The Roman engineer Vitruvius, writing in The Ten Books on Architecture, described the careful materials selection, proportioning, and workmanship that was critical to the performance of Roman concrete. Masonry and coarse and fine …
Terrain Analysis Using Digital Elevation Models, David G. Tarboton, Daniel Ames
Terrain Analysis Using Digital Elevation Models, David G. Tarboton, Daniel Ames
Civil and Environmental Engineering Faculty Publications
No abstract provided.
Another Look At Hartford Civic Center Coliseum Collapse, Rachel Martin, Norbert J. Delatte
Another Look At Hartford Civic Center Coliseum Collapse, Rachel Martin, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
Only a few hours after five thousand basketball fans had left, the roof of the Hartford Civic Center Coliseum collapsed under a heavy snowfall. Fortunately, the arena was empty. The design of the space frame roof had been based on an innovative and extensive computer analysis. However, when deflections twice as great as those predicted by the computer analysis were observed during construction, the warning was ignored. Overconfidence in computer analysis results played a large part in this failure. A useful lesson from this case is that the computer is only an analytical tool and computed results must be checked …
Simulation/Optimization Applications And Software For Optimal Ground-Water And Conjunctive Water Management, Richard C. Peralta
Simulation/Optimization Applications And Software For Optimal Ground-Water And Conjunctive Water Management, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
Diverse water management simulation/optimization (S/O) experiences promoted the development of many S/O modeling approaches and models. Several of these are being incorporated within the Simulation/Optimization Modeling System (SOMOS). Non-modeler water scientists or engineers can apply one SOMOS module to optimize field-scale groundwater and conjunctive water management. Experienced groundwater modelers can apply other modules to optimally manage complex heterogeneous aquifer and stream-aquifer systems. SOMOS employs a variety of simulation models and approaches and optimization algorithms to optimize flow and contaminant management. SOMOS or its precursor modules have been well proven in real-world projects. Designed for use by consultants, students, academics, and …
Remediation Simulation/Optimization Demonstrations, Richard C. Peralta
Remediation Simulation/Optimization Demonstrations, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
Applications of simulation/optimization (S/0) software to develop contamination remediation strategies include formal remediation optimization using heads and gradients (hydraulics-based) and concentrations (risk-based) constraints. The six reported cases involve pump and treat systems, or pump, treat and re-inject systems, together termed PAT systems. We used S/0 modeling to perform hydraulic optimization for two of the sites and transport optimization for four. For four of the six sites, other parties used normal simulation (S) modeling alone to develop pumping strategies. Comparing the S/0 model-developed strategies with the S model-developed strategies showed S/0 modeling benefits ranging up to: (a) 25 percent reduction in …