Hydraulic Engineering Commons^™

Interfacial Velocity Characteristics Downstream Of A Piano Key Weir Versus A Linear Weir In A Horizontal Channel, Biruk Belay, Mario Oertel

4th International Workshop on Labyrinth and Piano Key Weirs

The downstream flow characteristics of piano key weirs (PKWs) are highly complex, manifested by significant localized self-aeration due to nape collisions and plunging jets impacting the downstream free-surface. For PKWs installed in horizontal channels, the interfacial velocity characteristics have received limited attention in previous research. In this experimental study, air-water flow measurements were conducted using a double-tip conductivity probe downstream of a PKW and a reference ogee-crested linear weir to evaluate the velocity trends under comparable hydraulic boundary conditions. The findings reveal the existence of two distinct velocity profiles downstream of piano key weirs: quasi-wall-jet and uniform profiles. The occurrence …

Floating Trees At Co-Existing Pkw & Gated Spillway, James Yang, A. Helgesson, L. Johnsson, Sc Li

4th International Workshop on Labyrinth and Piano Key Weirs

During extreme flood events, floating trees (driftwood) can pose serious risks to the safety and operation of dams. In upgrading an existing dam, a piano key weir (PKW) is introduced to replace the aging embankment dam and to increase the discharge capacity of its gated spillway. This upgrade necessitates a detailed understanding of driftwood behavior at both discharge structures, which differ significantly in design and operating conditions. To investigate this, hydraulic model tests were conducted using small, freshly cut trees—some with branches and roots—to simulate natural trees moving towards the dam. The results indicate that tree accumulation at the gated …

The Performance Of Satellite-Based Precipitation Data To Reproduce Observed Precipitation In Tanzania's Little Ruaha Catchment, Florence H. Mahay

Tanzania Journal of Engineering and Technology (TJET)

Satellite-based precipitation datasets have emerged as promising tools for addressing rainfall data scarcity in regions with limited ground observations, such as Sub-Saharan Africa. This study evaluates the performance of five satellite-based precipitation products CHIRPS, CPC, GPCC, MERRA-2, and ERA5 in capturing rainfall characteristics over the Little Ruaha Catchment in Tanzania. The assessment was carried out at daily, monthly, and seasonal timescales and focused on key rainfall indices including onset and cessation dates, length of the rainy season, total rainfall, and frequency of rainy days. Validation was conducted using statistical indicators such as the correlation coefficient (r), Nash–Sutcliffe Efficiency (NSE), Root …

Morphological Changes Downstream Beni-Suef Bridge On The Nile River In Egypt, Muhammad Ahmad Abdul-Muttalib, Ahmed Moustafa Moussa, Gamal Helmy Elsaeed, Suzan Ahmed Mohammed

Journal of Engineering Research

The construction of the Beni-Suef bridge, spanning 550 meters over the Nile River, resulted in sediment accumulation and hindered navigation. This study investigates the causes of the morphodynamic changes and explores the impact of dredging as a mitigation measure through the area which extended approximately 2.6 kilometers downstream the bridge. A one-dimensional numerical model (HEC-RAS) was employed, utilizing bathymetric surveyed cross-sections from 1982, 2002, and 2004, along with discharge data from downstream Assuit Barrage and water levels from upstream Delta Barrage as boundary inputs. The model was calibrated and validated using measured water and bed levels. Sediment properties and bed …

Assessment Of Safety Monitoring Indexes Of High Rcc Gravity Dams Considering Hydraulic Fracture, Mohamed Ramdan, Jinsheng Jia Professor, Xu Li Professor

Journal of Engineering Research

High concrete gravity dams, particularly Roller-Compacted Concrete (RCC) types, face long-term safety challenges due to weak interlayer formation and crack propagation. This study presents a comprehensive evaluation of safety monitoring indexes for the Guxian high RCC dam (currently under construction in China) using both numerical and theoretical models. A Finite Element Method (FEM) was applied with two approaches: the strength reduction method, which considers weak layers, and the overloading method, which simulates extreme loading without accounting for material degradation. A comparative analysis between these two methods was conducted to determine which more effectively evaluates dam safety under varying conditions. Additionally, …

Using Hydraulic Simulations To Determine The Effects Of Tidal Behavior And Riparian Restoration On Chorro Creek, Jonathan L. Maas

Master's Theses

This thesis examines how tidal backwater effects and riparian restoration influence flooding in the Chorro Creek watershed, a major tributary to the Morro Bay Estuary on California’s Central Coast. Restoration efforts, including levee removal, floodplain reconnection, and revegetation have attempted to improve ecological function and reduce sediment transport. However, recent flood events suggest that these changes may also affect local hydraulics in ways not fully anticipated, particularly under the influence of tides and sea level rise. To analyze these dynamics, a two-dimensional HEC-RAS model was developed using LiDAR terrain, historical imagery, and field data collected from pressure and ultrasonic gauges. …

Stormwater Treatment Practices - Guidance For Maintenance And Targeting Pollutants, Peter T. Weiss

Stormwater Drainage Conference

Stormwater Drainage Conference

Biochar-Based Filtration And Barrier Systems For Urban Stormwater Treatment, Krishna R. Reddy

Stormwater Drainage Conference

Conference that deals a wide range of issues dealing with stormwater drainage. Professor Krishna Reddy of University of Illinois Chicago presented an invited talk titled "Biochar-Based Filtration and Barrier Systems for Urban Stormwater Treatment"

Gradually Varied Flow In Horizontal Circular Open Channels, Sanaa M. Hashim, I.M.H. Rashwan, Hewida Omara

Journal of Engineering Research

In investigations of gradually varied flow, open channels are categorized according to bed slope as horizontal, mild, critical, steep, and adverse. A canal is referred to as horizontal if its bed slope is zero. In open-channel hydraulics, calculating the water surface profile in an open channel is regarded as a crucial part of channel design. The objective of this present study is to solve the gradually varied flow in open circular channel with horizontal slope by using two mathematical methods called; direct integration method and Runge-Kutta method. The presented study used the experimental works to offer an explicit closed-form semi-analytical …

Flow Characteristics In Open Channel Confluences: Comparison Of Different Turbulence Models, Abdelrahman Mostafa Elazab None, Ibrahim Mohamed Rashwan, H. Omara

Journal of Engineering Research

This study uses numerical simulations in ANSYS Fluent to analyze the flow characteristics of open channel confluences. The primary objective is to assess the accuracy and predictive performance of three widely used turbulence models: the standard k–ε, the realizable k–ε, and the k–ω SST models. Simulations were performed under steady-state conditions. The results were validated against experimental data. Comparative analysis based on roots mean square error (RMSE) and flow behavior evaluation shows that all models can capture the main flow structures. However, the k–ω SST model demonstrated superior agreement with the experimental results, exhibiting the lowest RMSE and providing the …

An Eulerian-Pfem Approach To Model Transient Capillary Forces On Moving Contact Lines Of Spreading Liquid Drops: Applications In Hydraulic And Fluid Dynamics, Elaf N. Mahrous, Syed Yousufuddin, Muhammad Saleem Professor, Mohammed N. Iqbal, Muhammad T. Bin-Saleem

Journal of Engineering Research

This study addresses the complexities of simulating multiphase flows, particularly the dynamics of droplet behaviour on solid substrates, which are influenced by intricate capillary interactions. Despite advancements in fixed-grid and moving-grid methodologies, there remains a critical gap in accurately modelling transient phenomena and dissipative forces at the solid-liquid interface. We introduce a novel Eulerian-particle finite element method (PFEM) framework that captures the transient capillary forces associated with the movement of contact lines in liquid droplet spreading scenarios. Through a numerical assessment of three established dissipative force models—Jiang’s, Bracke’s, and Seeberg’s we identify Jiang's model as the most effective and stable …

Using Hydrologic And Hydraulic Simulations To Predict Near-Term Effects Of Beaver Habitat Restoration On Flood Flows, Luke S. Stewart

Master's Theses

There is a growing need to predict the complex hydrologic and hydraulic effects of beaver-maintained wetlands. This study uses relatively simple inputs and a replicable methodology to predict flood flow impacts of beaver habitat restoration at the site design scale using the engineering industry’s customary hydrology and hydraulic modeling approach. This study focuses on Toro Creek, the primary drainage for a 15.2 square mile watershed on the California Central Coast.

A hydrologic model of Toro Creek watershed was developed in HEC-HMS to approximate saturated soil conditions typical of late-spring flooding events observed in the region. The hydrologic model was calibrated …

Hickory Street Square Revitalization, Spencer Knight, Grace Dungan, Tim Kula, Evan Lauritsen, Lindsey Mennenga

Honors Program: Senior Projects (Public)

The Hickory Street Square Revitalization Project seeks to transform a central public space in Sidney, Nebraska into a dynamic, community-oriented area that supports local events, economic activity, and cultural heritage. The project addresses six core objectives: 1) convertible street design, 2) parking lot reconfiguration, 3) public amenities, 4) event flexibility, 5) lighting and signage, and 6) old electric plant renovation. A conceptual design was developed by the design team (S.T.E.E.L. Sentinel Solutions) by synthesizing the most effective features of three preliminary alternatives, shaped further through community feedback and evolving project constraints. The final project design minimizes disruption to existing activity …

Analysis Of Hydrological Model Uncertainty In The Response Of Farmers' Decision Models: A Case Study From The Lower Mississippi River Basin Region, Aayush Khadka

LSU New Orleans Theses and Dissertations

Ever since human have evolved on planet earth, they have been dependent on water resources for almost every aspect of their lives. From food production to industry, water has been an integral part of the ever-growing human civilization. Increasing reliance on water has resulted in development of effective and sustainable management strategies. However, water management has remained a complex task due to different human and natural stressors. Hydro-economic models are powerful tools that have been widely used to study water resource systems, management options, economic values, and infrastructures. They have been used to analyze the Water-Energy-Food nexus, climatic interactions, and …

Irrigation Performance Connection To Water Quality In Big Creek, Sena Bildim

All Graduate Theses and Dissertations, Fall 2023 to Present

Due to new technologies and improved water management strategies, sprinkler irrigation systems are becoming more common in Utah and nearby areas. These systems are generally thought to be more efficient, but their effects on water quality are not well understood. This study focuses on the Big Creek watershed, which flows into Bear Lake—an area where water quality concerns are increasing.

The purpose of this research was to explore how different irrigation systems—sprinkler and surface—affect both water use and water quality. Field tests were conducted to measure how evenly water was applied and how efficient each system was. Water and soil …

Exploring Variations In High-Resolution Downstream Hydraulic Geometry Of The Logan River, Gabriel V. Benitez

All Graduate Theses and Dissertations, Fall 2023 to Present

Rivers are dynamic systems that change shape due to natural events like floods, landslides, and wildfires, as well as human-made structures like bridges. These changes create unique and complex river patterns. However, measuring these changes accurately is challenging because traditional field surveys are time-consuming and often focus on easily accessible areas, which may not represent the whole river. Thanks to new high-resolution mapping technology and detailed river flow records, we can now see these changes in greater detail than ever before.

In this study, we focused on the Logan River, which flows through a canyon with a mix of rocky …

Quaternary Subsurface Characterization Of The Mississippi River Valley Alluvial Aquifer: Insights From Interval Kriging And Airborne Em-Borehole Data Integration, Yuqi Song

LSU Doctoral Dissertations

The Pleistocene period significantly contributed to the formation of alluvial aquifer worldwide. These productive aquifers are crucial for domestic, industrial, and agricultural water supplies. The Mississippi River Valley alluvial aquifer (MRVA), a principal aquifer in the U.S., is crucial for national food security and global agricultural supply. This study aims to characterize the subsurface architecture of the MRVA, thereby enhancing fundamental understanding of sedimentological processes involved in the genesis of glacio-fluvial aquifers worldwide. The research objectives are threefold: (1) to provide a detailed characterization of the MRVA; (2) to develop 3D geostatistical methods for geological modeling; and (3) to develop …

Bear Lake Water Quality And Chemistry: 114 Years Of Water Management, Connely Baldwin

Spring Runoff Conference

Motivation: Fall 2024 Bear Lake Sediment-Nutrient Reduction Workshop (Bear Lake Watch) motivated deeper dive into water quality and chemistry status and trends

Development Of A Low-Cost Stem Dendrometer For Irrigation Scheduling In Fruit Trees, Anderson Luiz Dos Santos Safre, Alfonso Torres-Rua, Brent Black

Spring Runoff Conference

Motivation 

• Irrigation scheduling in water scarce regions. 
• Water stress evaluation in tart cherry orchards.
• Plant-based methods more suitable for tree crops. 
• Elevated cost of commercial dendrometers (> 1,000 USD). 

Parrotfeather (Myriophyllum Aquaticum): Biology And Management Options In Utah, Francielli S. De Oliveira

Spring Runoff Conference

Parrotfeather (Myriophyllum aquaticum)

• Invasive weed from South America.
• Heterophilic perennial dioecious plant (female in the US).
• Forms dense mats, blocks waterways, and outcompetes native species
• Spreads via rhizomes, stolons, and stem fragments.

Comparing Two Methods To Monitor Singlet Oxygen Production In Aquatic Systems: Chemical Probe Vs. Time Resolved Phosphorescence., Monika Madhiyan

Spring Runoff Conference

What’s in water?

• DOM is a naturally occurring complex mixture of organic matter
• Pollutants from domestic, industrial and agricultural effluent are introduced into surface waters

Innovative Genetic Methods For Predicting Microcystin Toxin Production In Cyanobacterial Blooms: Real-Time And Pre-Bloom Public Health Monitoring, Liyuan Hou

Spring Runoff Conference

EQL emphasizes an integrated engineering and science approach to the environmental quality of land, water, and air

Chopping Up The Riverscape: Consistent Sample Frames For Assessment And Monitoring, Jordan Gilbert

Spring Runoff Conference

Background

• Riverscapes Assessment and Monitoring Lab (RAM)
• Joe Wheaton, Wally Macfarlane, Jordan Gilbert
• Founding member of Riverscapes Consortium
• Provide tools for people working in riverscapes
• Primarily planning, implementing, and monitoring restoration projects

Growing Roots: Water Conservation, Innovative Research And Public Education, Aurora Wallis Durfee

Spring Runoff Conference

Hydroponics allows for efficient, sustainable food production, using less water and space than traditional farming methods.

Water Markets In Utah? Water Manager Perspectives On Potential Uptake, Britta L. Schumacher

Spring Runoff Conference

Irrigation organizations: intermediaries that deliver water to farms, ranches, and other users, coordinate investments in conveyance infrastructure, and manage limited water supplies.

Advancing 3d Channel Representation To Support National Scale Flood Forecasting Operations, Jose Castejon Villalobos, Anzy Lee, Noelle Patterson, Belize Lane, Colin Phillips

Spring Runoff Conference

Storms and Flooding are major annual disasters.

Paired Storms Reveal Post-Fire Flood Characteristics And Drivers, Haley Canham, Belize Lane

Spring Runoff Conference

The wildfire regime is changing in the western US.

Davis Aqueduct Reach 1 - The Design And Construction Of Large Diameter Pipelines, Shane Mcfarland

Spring Runoff Conference

Designing and building a seismically resilient 72-inch pipeline.

District Overview: Weber Basin Water Conservancy District

From Vulnerabilities And Concern To Action: How Perceived Climate Vulnerabilities And Concern For The Great Salt Lake Desiccation Shape Utahns’ Migration Decision, Mufti Nadimul Quamar Ahmed, Jennifer E. Givens

Spring Runoff Conference

In light of the current climate crisis, how do Utahns perceive their climate or disaster vulnerabilities and concern for the Great Salt Lake desiccation? Does the perception of vulnerabilities and concern for the Great Salt Lake desiccation influence their intention to migrate from Utah?

Water And Journalism Panel, Heather May, Anastasia Hufham, Ben Winslow, Sheri Quinn

Spring Runoff Conference

Respondents’ sources of information on Great Salt Lake issues