Other Civil and Environmental Engineering Commons^™

Performance Analysis Of Steel Bridge Deck Reinforced By Uhpc Based On Fracture Mechanics, Long Yiyu

Journal of China & Foreign Highway

At the deck-rib welding joints of orthotropic steel bridge decks, cracking can easily occur under the vehicle load, and the fatigue risk of steel bridge decks can be effectively reduced by UHPC reinforcement. To investigate the effect of UHPC-reinforced steel bridge decks, this paper carried out finite element analysis based on linear-elastic fracture mechanics. By taking the orthotropic steel bridge deck test as the reference, the fatigue performance at the weld toe was calculated, and the reliability of the finite element model was verified. Stress intensity factor calculation analysis was performed by inserting an initial crack at the weld detail, …

Key Technology Of Demolition And Reconstruction Design Of Wudou Bridge, Li Huaqiang

Journal of China & Foreign Highway

Bridges constructed between the 1960s and 1970s have been damaged to different degrees during operation due to excessive traffic flow and severe overloading of vehicles, and thus cannot meet the requirements for safe passage of vehicles and navigation. Therefore, they need to be demolished and rebuilt. To safely, economically and efficiently demolish the old bridges and rebuild them in-situ, this paper studied a design concept of integrated construction and demolition. Based on the Wudou Bridge demolition and reconstruction project in Foshan, the combination of theoretical analysis and computational simulation was utilized to conduct a multi-scheme study from the perspectives of …

Mixing, Metabolism, And Climate Change: A Modeling Case Study Of A Shallow Hypereutrophic, Polymictic Lake, Benjamin Reuss

Dissertations, Master's Theses and Master's Reports

Globally, lakes are sites of significant carbon cycling, respiring an estimated 0.07 to 0.15 Pg as CO2 and sequestering 0.03 to 0.07 Pg C in sediments annually. These processes can be affected by nutrient availability, with seasonal mixing regulating nutrient transport in monomictic and dimictic systems. However, the effect of intermittent mixing on ecosystem production in polymictic systems has been much less studied. The timing and frequency of lake mixing are expected to be altered by climate change, which has the potential to impact nutrient transport. The first chapter of this thesis introduces lake mixing dynamics and indices of mixing. …

Lucidpipe™ Power System, Purdue Ect Team

ECT Fact Sheets

In most gravity fed water transmission pipelines, it is desired to reduce excess pressure head to prevent undue strain on a pipeline and lower the incidence of leaks. Normally this is done with pressure reducing valves that essentially burn off this excess pressure as heat. The LucidPipe™ system converts it to low cost electricity thereby removing unwanted pressure and generating energy at the same time - energy that can be put used behind the grid or put back on the grid. The LucidPipe™ system extracts a small percentage of pressure head providing nearly invisible operation allowing water operators to fulfill …

Chapter 6: Hydraulic Grade Line (Hgl) And Energy Grade Line (Egl), Donald Chase

Open Educational Resource: Civil Engineering Course Notes

No abstract provided.

Swat: Model Use, Calibration, And Validation, Michael White, Jeffrey Arnold, M. Van Liew

Biological Systems Engineering: Papers and Publications

SWAT (Soil and Water Assessment Tool) is a comprehensive, semi-distributed river basin model that requires a large number of input parameters, which complicates model parameterization and calibration. Several calibration techniques have been developed for SWAT, including manual calibration procedures and automated procedures using the shuffled complex evolution method and other common methods. In addition, SWAT-CUP was recently developed and provides a decision-making framework that incorporates a semi-automated approach (SUFI2) using both manual and automated calibration and incorporating sensitivity and uncertainty analysis. In SWAT-CUP, users can manually adjust parameters and ranges iteratively between autocalibration runs. Parameter sensitivity analysis helps focus the …

Merging Terrestrial And Satellite Gravity Data For Africa: A Possibility To Fill-In The Data Gaps, Hussein A. Abd-Elmotaal

Mansoura Engineering Journal

The major challenge that the IAG Sub-Commission on gravity and geoid in Africa faces is the significantly large gravity data gaps. It is essential to properly tackle this issue for all geodetic applications in Africa due to the large interpolation errors occur at these large gaps. Simple interpolation (using any type of interpolation technique) of the gravity data does not add new information at the large data gaps, and the solution is free there. Global Earth gravity models offer themselves as a possible way to fill-in such large data gaps, provided that they approximate the African gravity field to an …

Long-Term Patterns Of Air Temperatures, Daily Temperature Range, Precipitation, Grass-Reference Evapotranspiration And Aridity Index In The Usa Great Plains: Part I. Spatial Trends, Meetpal Kukal, Suat Irmak

Biological Systems Engineering: Papers and Publications

Due to their substantial spatio-temporal behavior, long-term quantification and analyses of important hydrological variables are essential for practical applications in water resources planning, evaluating the water use of agricultural crop production and quantifying crop evapotranspiration patterns and irrigation management vs. hydrologic balance relationships. Observed data at over 800 sites across the Great Plains of USA, comprising of 9 states and 2,307,410 km² of surface area, which is about 30% of the terrestrial area of the USA, were used to quantify and map large-scale and long-term (1968-2013) spatial trends of air temperatures, daily temperature range (DTR), precipitation, grass-reference evapotranspiration (ET …

Water Distribution Modeling, Donald Chase

Civil and Environmental Engineering and Engineering Mechanics Faculty Publications

To effectively use water distribution models, the engineer must be able to link knowledge of basic hydraulic theory and the mechanics of the program with that of the operation of real-world systems. Water Distribution Modeling does just that.

Written by industry experts, it provides a practical resource for engineers and modelers that goes well beyond being a how-to guide for typing data into a computer program. It contains straightforward answers to common questions related both to modeling and to distribution systems in general.

This textbook walks the practicing engineer or student through the modeling process from start to finish — …

Ag-Iot For Crop And Environment Monitoring: Past, Present, And Future, Yufeng Ge, Geng Bai, Nipuna Chamara, Yeyin Shi, Md Islam

Biological Systems Engineering: Papers and Publications

CONTEXT: Automated monitoring of the soil-plant-atmospheric continuum at a high spatiotemporal resolution is a key to transform the labor-intensive, experience-based decision making to an automatic, data-driven approach in agricultural production. Growers could make better management decisions by leveraging the real-time field data while researchers could utilize these data to answer key scientific questions. Traditionally, data collection in agricultural fields, which largely relies on human labor, can only generate limited numbers of data points with low resolution and accuracy. During the last two decades, crop monitoring has drastically evolved with the advancement of modern sensing technologies. Most importantly, the introduction …