Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- UWRL (5)
- Blue Nile River Basin (2)
- Dam operation (2)
- Drought (2)
- Hydrologic regimes (2)
-
- Interval number (2)
- Uncertainty (2)
- Water resources (2)
- Aerosol (1)
- Amman (1)
- Cilmate change (1)
- Climate change (1)
- Cross (1)
- Energy loss (1)
- Generalized additive models (1)
- Household conservation (1)
- Hydraulic design (1)
- Hydrology (1)
- Jordan (1)
- K-factor (1)
- Lidar (1)
- Linear program (1)
- Local loss (1)
- Loss coefficient (1)
- Optimization with uncertainty (1)
- PM10 (1)
- PM2.5 (1)
- Pipe junction (1)
- Random forests (1)
- Shortage management (1)
Articles 1 - 9 of 9
Full-Text Articles in Engineering
Climate Change Impacts On Water Resources Of The Upper Blue Nile River Basin, Ethiopia, U. Kim, Jagath J. Kaluarachchi, V. U. Smakhtin
Climate Change Impacts On Water Resources Of The Upper Blue Nile River Basin, Ethiopia, U. Kim, Jagath J. Kaluarachchi, V. U. Smakhtin
Civil and Environmental Engineering Faculty Publications
Climate change affects water resources availability of international river basins that are vulnerable to runoff variability of upstream countries especially with increasing water demands. The upper Blue Nile River Basin is a good example because its downstream countries, Sudan and Egypt, depend solely on Nile waters for their economic development. In this study, the impacts of climate change on both hydrology and water resources operations were analyzed using the outcomes of six different general circulation models (GCMs) for the 2050s. The outcomes of these six GCMs were weighted to provide average future changes. Hydrologic sensitivity, flow statistics, a drought index, …
Modeling Soil Depth From Topographic And Land Cover Attributes, Teklu K. Tesfa, David G. Tarboton, David G. Chandler, James P. Mcnamara
Modeling Soil Depth From Topographic And Land Cover Attributes, Teklu K. Tesfa, David G. Tarboton, David G. Chandler, James P. Mcnamara
Civil and Environmental Engineering Faculty Publications
Soil depth is an important input parameter in hydrological and ecological modeling. Presently, the soil depth data available in national soil databases (STATSGO and SSURGO) from the Natural Resources Conservation Service are provided as averages within generalized land units (map units). Spatial uncertainty within these units limits their applicability for distributed modeling in complex terrain. This work reports statistical models for prediction of soil depth in a semiarid mountainous watershed that are based upon the relationship between soil depth and topographic and land cover attributes. Soil depth was surveyed by driving a rod into the ground until refusal at locations …
Assessment Of Climate Change Impacts On Water Resources Of The Upper Blue Nile River Basin, Ethiopia, U. Kim, Jagath J. Kaluarachchi
Assessment Of Climate Change Impacts On Water Resources Of The Upper Blue Nile River Basin, Ethiopia, U. Kim, Jagath J. Kaluarachchi
Civil and Environmental Engineering Faculty Publications
Climate change affects water resources availability of international river basins that are vulnerable to runoff variability of upstream countries especially with increasing water demands. The upper Blue Nile River Basin is a good example because its downstream countries, Sudan and Egypt, depend solely on Nile waters for their economic development. In this study, the impacts of climate change on both hydrology and water resources operations were analyzed using the outcomes of six different general circulation models (GCMs) for the 2050s. The outcomes of these six GCMs were weighted to provide average future changes. Hydrologic sensitivity, flow statistics, a drought index, …
Improving Open Canned Systems, David Sanders, Steven L. Barfuss, Michael C. Johnson
Improving Open Canned Systems, David Sanders, Steven L. Barfuss, Michael C. Johnson
Civil and Environmental Engineering Faculty Publications
The results of a study on the hydraulic performance of open-bottom canned pump intakes should aid engineers and pump users to design these systems with reduced velocity fluctuations and undesirable flow rotation.
Data Collection Methodology For Dynamic Temperature Model Testing And Corroboration, Bethany T. Neilson, David King Stevens, S. C. Chapra, Christina J. Bandaragoda
Data Collection Methodology For Dynamic Temperature Model Testing And Corroboration, Bethany T. Neilson, David King Stevens, S. C. Chapra, Christina J. Bandaragoda
Civil and Environmental Engineering Faculty Publications
This article describes a data collection approach for determining the significance of individual heat fluxes within streamswith an emphasis on testing (i.e. identification of possible missing heat fluxes), development, calibration and corroborationof a dynamic temperature model. The basis for developing this approach was a preliminary temperature modelling effort onthe Virgin River in southwestern Utah during a low-flow period that suggested important components of the energy balancemight be missing in the o riginal standard surface-flux temperat ure model. Possible missing heat fluxes were identi fied as bedconduction, hyporheic exchange, dead zone warming and exchange and poor representation of the amount of …
Energy Losses In Cross Junctions, Zachary B. Sharp, Michael C. Johnson, Steven L. Barfuss, William J. Rahmeyer
Energy Losses In Cross Junctions, Zachary B. Sharp, Michael C. Johnson, Steven L. Barfuss, William J. Rahmeyer
Civil and Environmental Engineering Faculty Publications
Energy losses occurring in pipe junctions have been studied for many years. Head loss coefficients (KK) are commonly used to characterize losses across elbows, tees, crosses, valves, and other pipe fittings. When accurate values of KK are used, the flow rate and corresponding total head at any location in a pipe network can be calculated. While KK is well defined for most pipe junctions and fittings, the literature has limited documentations of KK for crosses. This study was commissioned to determine KK for a wide range of flow combinations in a pipe cross with equal diameter pipes and varied flow …
Shades Of Grey: A Critical Review Of Grey-Number Optimization, David E. Rosenberg
Shades Of Grey: A Critical Review Of Grey-Number Optimization, David E. Rosenberg
Civil and Environmental Engineering Faculty Publications
A grey number is an uncertain number with fixed lower and upper bounds but unknown distribution. Grey numbers find use in optimization to systematically and proactively incorporate uncertainties expressed as intervals plus communicate resulting stable, feasible ranges for the objective function and decision variables. This article critically reviews their use in linear and stochastic programs with recourse. It summarizes grey model formulation and solution algorithms. It advances multiple counter-examples that yield risk-prone grey solutions that perform worse than a worst-case analysis and do not span the stable feasible range of the decision space. The article suggests reasons for the poor …
Modeling Integrated Decisions For A Municipal Water System With Recourse And Uncertainties: Amman, Jordan, David E. Rosenberg, Jay Lund
Modeling Integrated Decisions For A Municipal Water System With Recourse And Uncertainties: Amman, Jordan, David E. Rosenberg, Jay Lund
Civil and Environmental Engineering Faculty Publications
Stochastic mixed-integer optimization is used to identify a portfolio of long- and short-term supply and conservation actions for a municipal water system to cost-effectively accommodate a distribution of water shortages. Alternative robust, grey-number, and best/worst case formulations systematically explore implications of uncertainties in action costs, life spans, water volumes gained or saved, shortage levels, and shortage probabilities. A detailed example for Amman, Jordan considers 23 potential actions. Results show: (1) remarkable consistency occurs across the different modeling approaches. (2) Conserving water—reducing leakage and targeting select customers to install water efficient appliances—plays an important and growing role over time. (3) A …
Aglite Lidar: A Portable Elastic Lidar System For Investivating Aerosol And Wind Motions At Or Around Agricultural Production Facilities, Christian C. Marchant, Thomas Wilkerson, Gail E. Bingham, Vladimir V. Zavyalov, Jan M. Andersen, Cordell B. Wright, Scott S. Cornelsen, Randy S. Martin, Philip J. Silva, Jerry L. Hatfield
Aglite Lidar: A Portable Elastic Lidar System For Investivating Aerosol And Wind Motions At Or Around Agricultural Production Facilities, Christian C. Marchant, Thomas Wilkerson, Gail E. Bingham, Vladimir V. Zavyalov, Jan M. Andersen, Cordell B. Wright, Scott S. Cornelsen, Randy S. Martin, Philip J. Silva, Jerry L. Hatfield
Civil and Environmental Engineering Faculty Publications
The Aglite Lidar is a portable scanning lidar that can be quickly deployed at agricultural and other air quality study sites. The purpose of Aglite is to map the concentration of PM10 and PM2.5 in aerosol plumes from agricultural and other sources. Aglite uses a high-repetition rate low-pulse energy 3-wavelength YAG laser with photon-counting detection together with a steerable pointing mirror to measure aerosol concentration with high spatial and temporal resolution. Aglite has been used in field campaigns in Iowa, Utah and California. The instrument is described, and performance and lidar sensitivity data are presented. The value of the lidar …