Spatial And Temporal Storm Generation From A Stochastic View, 2018 Purdue University
Spatial And Temporal Storm Generation From A Stochastic View, Jiaxiang Ding, Josept D. Revuelta-Acosta, Engel Bernard
The Summer Undergraduate Research Fellowship (SURF) Symposium
Precipitation is one of the most important parameters in the study of hydrology and most of the research has been done on daily storm generation. Current weather generation models are used to replicate daily or monthly time resolution, which is not able to show the variability within one day or one month. This project deals with sub-daily storm generation with finer resolution and more accurate estimation, which also requires an independent storm separation method. And the Monte Carlo correlated multivariate simulation is applied to compute the variables. The description is essential for soil erosion and water quality research. Another reason ...
Testing And Development Of Pre-Stressed Cfrp Retrofit Strategies For Controlling Fatigue Cracking In Steel Waterway Lock Gate Structures, 2018 University of Arkansas, Fayetteville
Testing And Development Of Pre-Stressed Cfrp Retrofit Strategies For Controlling Fatigue Cracking In Steel Waterway Lock Gate Structures, Maggie Langston
Theses and Dissertations
Steel waterway lock gates across the national inland waterway transportation network are reaching and exceeding their intended service life, often experiencing component failures that lead to service interruptions. Unscheduled maintenance and repair of lock gates can be expensive and cause economic ripples throughout the entire inland waterway network. These lock gate component failures are often caused by fatigue cracking from repeated loading during operation. This thesis develops and tests a prestressed carbon fiber reinforced polymer (CFRP) fatigue retrofit for controlling fatigue demands within lock gate components. The study expands upon a recent analytical work by Lozano (2017) by experimentally investigating ...
Validation Of 16 Degree Arced Labyrinth Weir Coefficients, 2018 Utah State University
Validation Of 16 Degree Arced Labyrinth Weir Coefficients, Megan Gordon Montgomery
All Graduate Plan B and other Reports
Labyrinth weirs are frequently used to control flow in spillways. Arced labyrinth weirs have been developed and researched in an effort to pass additional flow. Arced labyrinth weirs are more efficient than labyrinth weirs due to their increased length and improved approach flow conditions. In the past research has been done to develop discharge coefficients, Cd, values for arced labyrinth weirs with varying sidewalls angles (a=6°, 12°, and 20°). The Cd data that has been developed can only be used for those specific geometries tested. The purpose of this study was to develop Cd data for an arced labyrinth ...
Numerical Modeling Of The Effects Of Land Use Change And Irrigation On Streamflow Depletion Of Frenchman Creek, Nebraska, 2018 University of Nebraska - Lincoln
Numerical Modeling Of The Effects Of Land Use Change And Irrigation On Streamflow Depletion Of Frenchman Creek, Nebraska, Moussa Guira
Dissertations & Theses in Earth and Atmospheric Sciences
A three-dimensional Control Volume Finite Difference-based numerical groundwater flow model was constructed to assess the effects of agricultural irrigation and land use change on streamflow depletion. The study area is Frenchman Creek basin located in southwestern corner of the State of Nebraska, USA. This area was subject to an increased proliferation of groundwater abstraction for agricultural purposes since industrial revolution. It has also been subject to land use change from native rangeland to dry and irrigated cropland. The groundwater flow model was spatially discretized using Voronoi cells in unstructured grid built with the USGS MODFLOW-6. Temporal discretization defined 151 time ...
Wave Attenuation By Constructed Oyster Reef Breakwaters, 2018 Louisiana State University and Agricultural and Mechanical College
Wave Attenuation By Constructed Oyster Reef Breakwaters, Jason M. Chauvin
LSU Master's Theses
Biloxi Marsh, located along the shoreline of Eloi Bay in St. Bernard Parish, Louisiana has experienced significant shoreline erosion in recent years. The Living Shoreline Demonstration Project, completed in November 2016, constructed three miles of living shoreline structures to attenuate waves and thus combat marsh edge erosion along the shoreline of Eloi Bay. Several types of constructed oyster reef breakwaters were installed for this demonstration project. Due to the experimental nature of these products, available performance characteristics are limited.
This research measures wave attenuation across the constructed oyster reef breakwaters using bottom-mounted pressure gauges. Seven pressure gauges were deployed to ...
1-Dimensional Hydraulic And Sediment Transport Modelling Of An Emergency Spillway, 2018 The University of Western Ontario
1-Dimensional Hydraulic And Sediment Transport Modelling Of An Emergency Spillway, Ryan Weise
Electronic Thesis and Dissertation Repository
Hydropower dams are complex structures that require a high level of safety. Systems approach and system simulation have provided new insights into evaluating dam safety. System simulation of hydropower dams requires that the physical state of the critical infrastructure be represented. A 1-dimensional hydraulic and sediment transport model was developed within HEC-RAS to address erosion in an emergency spillway for an existing system simulation model. Various inflow events were simulated, and the ensuing erosion was evaluated. A range of Manning’s roughness coefficients were tested and the sensitivity was minimal. Erosion and deposition values were not accurate but offer an ...
Ewb-Wyo Comunidad Maya Water Distribution System Design, 2018 University of Wyoming
Ewb-Wyo Comunidad Maya Water Distribution System Design, Brandon Wilde, Nick Blume, Presleigh Hayashida, Tristan Mckenzie
Honors Theses AY 17/18
For the past five years, the University of Wyoming chapter of Engineers Without Borders (EWB-WYO) has worked with a small community in Guatemala to renovate the town’s water distribution system. Comunidad Maya receives its water supply from two spring box systems installed in nearby hills, but has suffered lately from insufficient water delivery. EWB-WYO has sent multiple teams to analyze the predicament from various angles and to ascertain the primary causes of the water shortage. These trips have been followed by periods of design and redesign, as EWB-WYO has sought the best long-term solution for the community.
In recent ...
The Dynamics Of Mixing And Subtidal Flow In A Maine Estuary, 2018 University of Maine
The Dynamics Of Mixing And Subtidal Flow In A Maine Estuary, Kristopher Bears
Electronic Theses and Dissertations
Long-term material transport in estuaries is largely controlled by subtidal flow. Subtidal flows are driven by conditions specific to their geographic location, namely river discharge, tidal forcing, and wind. These conditions are further modified by mixing, curvature of the estuary, Coriolis, and friction. While many practices of measuring these various forcing mechanisms exist, the current literature fails to provide a standard for measuring turbulent mixing in well- mixed estuaries. As a changing climate affects these various forcing and modifying mechanisms via sea level rise and increased precipitation, the corresponding material transport scheme is expected to change accordingly. Subtidal flow and ...
Utah Salt Storage Facilities Guidelines And Best Management Practices, 2018 Utah State University
Utah Salt Storage Facilities Guidelines And Best Management Practices, Weston Bellon
All Graduate Plan B and other Reports
An environmental analysis was conducted at the Utah Water Research Laboratory of samples gathered from Utah Department of Transportation (UDOT) salt storage facilities retention ponds across the state. The analysis indicated high levels of TSS largely made up of minerals directly associated with the deicing solution currently used by UDOT in roadway applications. As a companion to that analysis, best management practices have been identified and compiled to provide a resource for the proper management of salt storage facilities in the state of Utah. Topics included as best management practices include locating new storage facilities, proper salt storage, proper salt ...
Solar Water-Heating In The Developing World, 2018 Carroll College
Solar Water-Heating In The Developing World, Raymond Gomez, Kellen Miller
Carroll College Student Undergraduate Research Festival
We designed a solar heating system for an elderly home in Saint Lucia. St. Lucia is a Caribbean island-country with abundant rainfall. We worked with EWB to design a system that provides sufficient hot rainwater to the laundry facility. Free hot water is a great resource.
Hawai'i Wildlife Fund V. County Of Maui, 2018 Alexander Blewett III School of Law at the University of Montana
Hawai'i Wildlife Fund V. County Of Maui, Lowell J. Chandler
Public Land & Resources Law Review
In Hawai’i Wildlife Fund v. County of Maui, the Ninth Circuit held that the plain language of the Clean Water Act provides jurisdiction over indirect discharges of pollutants from a point source into groundwater that is shown to be connected to navigable waters. The court found that studies confirmed pollutants entering the Pacific Ocean were fairly traceable to the County of Maui’s sewage disposal wells. In affirming the district court’s ruling, the Ninth Circuit held that Maui County violated the Clean Water Act by discharging pollutants into a navigable water without the required permit. The court also ...
Predicting Effects Of Climate Change And Sea Level Rise On Hydrologic Processes In A Mid-Atlantic Coastal Watershed, 2018 Old Dominion University
Predicting Effects Of Climate Change And Sea Level Rise On Hydrologic Processes In A Mid-Atlantic Coastal Watershed, Rui Li
Civil & Environmental Engineering Theses & Dissertations
This dissertation assessed impacts of Climate Change (CC) and Sea Level Rise (SLR) on coastal hydrologic processes using the Lynnhaven River watershed as a test bed. The watershed is part of Chesapeake Bay Watershed and hydraulically connected with mid-Atlantic Ocean. Six CC scenarios were considered in terms of eight Regional Climate Models’ predictions for three Intergovernmental Panel on Climate Change (IPCC) emission assumptions, namely, B1, A1B, and A2, for two future periods, namely 2046 to 2065 and 2081 to 2099. The ensemble means of downscaling results from four methods were used to represent the future climates. On the other hand ...
Modeling Effects Of Rainwater Harvesting Systems On Water Yield Increase And Non-Beneficial Evaporation Reduction To Sustain Agriculture In A Water-Scarce Region Of China, 2018 Old Dominion University
Modeling Effects Of Rainwater Harvesting Systems On Water Yield Increase And Non-Beneficial Evaporation Reduction To Sustain Agriculture In A Water-Scarce Region Of China, Tennille Wade
Civil & Environmental Engineering Theses & Dissertations
The northwestern region of China, which has an arid/semiarid climate, relies heavily on agriculture to provide food for the growing population. Climate change is affecting water availability in the region, causing long periods of drought and water scarcity followed by shorter periods of heavy rainfall and excess water availability. The ridge and furrow rainwater harvesting systems (RFRWHS) are a means of solving the problem of water scarcity; the systems can replenish soil moisture, reduce non-beneficial evaporation from bare soils, and increase surface water yield. In such a region, the hydrologic cycle is dominated by soil evaporation, leading to minimal ...
Evaluation Of A Hybrid Reflectance-Based Crop Coefficient And Energy Balance Evapotranspiration Model For Irrigation Management, 2018 University of Nebraska-Lincoln
Evaluation Of A Hybrid Reflectance-Based Crop Coefficient And Energy Balance Evapotranspiration Model For Irrigation Management, J. Burdette Barker, Christopher M. U. Neale, Derek M. Heeren, Andrew E. Suyker
Biological Systems Engineering: Papers and Publications
Accurate generation of spatial soil water maps is useful for many types of irrigation management. A hybrid remote sensing evapotranspiration (ET) model combining reflectance-based basal crop coefficients (Kcbrf) and a two-source energy balance (TSEB) model was modified and validated for use in real-time irrigation management. We modeled spatial ET for maize and soybean fields in eastern Nebraska for the 2011-2013 growing seasons. We used Landsat 5, 7, and 8 imagery as remote sensing inputs. In the TSEB, we used the Priestly-Taylor (PT) approximation for canopy latent heat flux, as in the original model formulations. We also used the Penman-Monteith ...
Artificial Recharge Of Groundwater As A Management Tool For The Kabul Basin, Afghanistan, 2018 Louisiana State University
Artificial Recharge Of Groundwater As A Management Tool For The Kabul Basin, Afghanistan, Mohammad Farid Masoom
LSU Master's Theses
Decades of war and political instability, consecutive droughts, population increase and displacement, caused serious infrastructural damages to water resources of Afghanistan. The main source of water supply for people in Afghanistan is groundwater. However, over-exploitation of groundwater has led to groundwater level declines in most parts of the country. Kabul, the largest city of Afghanistan, is the capital city with a population of 4.5 million and the fifth fastest-growing city in the world. The city has observed groundwater level declines of 5-10 meters (m) since 1980. Decline of about 30 m has also been observed in one of the ...
A Detailed Hydrodynamic Study To Help Community Based Resiliency Planning Under Extreme Climatic And Weather Events, Md. Golam Rabbani Fahad
Theses and Dissertations
The State of New Jersey is particularly vulnerable to extreme weather and climatic events. This study concentrates on spatial and temporal vulnerability of these events using climate and hydrodynamic modelling. The first chapter focuses on historical climatic trend of temperature and precipitation as well as the future scenarios using 10 bias corrected climate model output considering high end emission scenario derived from Coupled Model Intercomparison Project Phase 5 (CMIP5). In the second chapter a coastal hydrodynamic model called ADCIRC-2DDI was implemented to assess the impact of hurricanes in the Western North Atlantic (WNAT) model domain. The efficiency of the model ...
Bathymetry Data For Lakes Azuei And Enriquillo, 2018 CUNY City College
Bathymetry Data For Lakes Azuei And Enriquillo, Michael Piasecki, Mahrokh Moknatian
Publications and Research
This data set supports and forms the basis for the development of Digital Bathymetry Models (DBM) for Lakes Azuei (Haiti) and Enriquillo (Dominican Republic). Bathymetric Data is typically acquired using Sonar devices that measure the depth at specific points along a boat track and for which the longitude and latitude is recorded. From the resulting point cloud one develop a seamless representation of the floor of the lake on either a raster set (which is what we have done) or try to use a contour (vector representation) model in which the depth contours appear as polygons or -lines. The raw ...
Spot-R By Triax, 2018 Construction Engineering & Management, Purdue University
Spot-R By Triax, Purdue Ect Team
ECT Fact Sheets
Triax’s Spot-r system was developed to tackle the construction industry’s unique safety and productivity challenges, stemming from a demonstrated lack of total jobsite visibility and automatically collected, easily accessible field data. Spot-r by Triax combines a proprietary mesh network with sensor technology to record and transmit previously unattainable workforce and equipment location, activity and safety data within a defined area – all in real-time.
The Spot-r network is installed around the site and operates in a 900 MHz network, with a subset using a cellular connection to forward Spot-r sensor data to Triax’s custom, cloud dashboard. In the ...
Purdue’S Biowall, 2018 Construction Engineering & Management, Purdue University
Purdue’S Biowall, Purdue Ect Team
ECT Fact Sheets
Mechanical ventilation, energy recovery ventilation, and infiltration (air that leaks into a building) are commonly used to introduce fresh air. These are all valid approaches, but a living plant-based filter is an innovative complement to these traditional technologies. A Biowall has the potential to improve indoor air quality while reducing the quantity of air needed for ventilation, creating the potential for energy savings. Figure 1 shows a Biowall prototype being evaluated in the ReNEWW House, a research home located near the Purdue University campus (http://www.renewwhouse.com/).
Mdp (Machine Drive Power) Intelligent Compaction Technology, 2018 Construction Engineering & Management, Purdue University
Mdp (Machine Drive Power) Intelligent Compaction Technology, Purdue Ect Team
ECT Fact Sheets
Caterpillar developed MDP (Machine Drive Power) technology to fill this gap. Rather than an accelerometer and vibratory drum, it uses the principle of rolling resistance to provide indications of soil stiffness. This allows it to perform more reliably on cohesive and granular soils with less variability than accelerometer systems. It also means that the technology can be used on both vibratory and static drum compactors, which are often used on larger sites. While the technology is quite useful on its own, it is even better as a complementary technology to the existing accelerometer-based systems. Contractors who use vibratory soil compactors ...