Digital Commons Network^™

Nachtigal Dam: A 4917 M Long Labyrinth Spillway, F. Laugier, Denis Magnan, B. Blancher, Arnaud Chapius, Thibaut Guillemot, Sebastien Erpicum

4th International Workshop on Labyrinth and Piano Key Weirs

The Nachtigal Dam, part of the Nachtigal Amont Hydropower Project in Cameroon, features a 4917-meter-long labyrinth spillway, designed to safely manage floodwaters. This spillway was optimized for hydraulic safety, cost efficiency, and environmental considerations. Physical scale modeling (at a relatively rare 1:12.5 scale) and detailed design adjustments ensured robust performance under various flow conditions. Despite construction challenges for such a large-scale nonlinear structure, the project achieved reliable spillway operations, demonstrating the suitability of labyrinth weirs for large-scale hydraulic infrastructure.

Train Engine No. 382, Paducah, Kentucky

Miscellaneous Postcards and Photographs

Engine number 382 is featured in this black and white photograph with four men standing on the tracks beside the engine and two men pictured standing and seated in the engine's cabin. Trees are seen behind the engine. A note typed on the back of the photograph identify the engine as having been the same one that Casey Jones was killed in on April 30, 1900 at Vaughn, Mississippi. The note goes on to say that the photograph was taken after the engine was rebuilt in the Paducah Shops in Paducah, Kentucky. A red ink stamp for Jay's Caboose in …

World Register Of Piano Key Weirs, Sebastien Erpicum, Tohid Jamali Rovesht, Brian M. Crookston, Pierre Archambeau

4th International Workshop on Labyrinth and Piano Key Weirs

Piano Key Weirs have been proposed in 2003. Since then, more than 40 projects have been commissioned over the world. This presentation details a world register of piano key weir prototypes, freely available online. It also analyses the main characteristics of these structures in operation to highlight trends in design.

Central Railroad Depot, Winona, Mississippi

Mississippi Delta Region

A black and white illustration of people waiting on the platform and tracks a the Illinois Central Railroad Depot in Winona, Mississippi is featured on this postcard. The train is depicted as pulling into the depot, smoke billowing from the stack at the front of the engine. Wagons and utility poles are pictured on the platform in front of the depot buildings. The title of the card is printed along the top of the card.

Train Engine No. 638in Water Valley, Mississippi, October 31, 1893

Mississippi Delta Region

Casey Jones is pictures in the cabin of train engine number 630 of the Illinois Central Railroad Company, a consolidation 280 engine that Jones ran from the World's Columbian Exposition in Chicago, Illinois to Water Valley, Mississippi in October 1893. Another man is pictured standing on the steps of the engine and trees are seen behind the engine. A typed note on the back of the photograph tells the story of Jones' trip and the impressive feat of running the engine over five operating divisions. A red ink stamp advertising Jay's Caboose in Greensboro, Alabama is beneath the note.

Train Engine No. 382, Paducah, Kentucky

Miscellaneous Postcards and Photographs

Engine number 382 is featured in this black and white photograph with four men standing on the tracks beside the engine and two men pictured standing and seated in the engine's cabin. Trees are seen behind the engine. A note typed on the back of the photograph identify the engine as having been the same one that Casey Jones was killed in on April 30, 1900 at Vaughn, Mississippi. The note goes on to say that the photograph was taken after the engine was rebuilt in the Paducah Shops in Paducah, Kentucky. A red ink stamp for Jay's Caboose in …

Value Added 3d Modeling – Lower Crow Dam Spillway Modification And Rehabilitation Project, Justin Bartels

4th International Workshop on Labyrinth and Piano Key Weirs

The Confederated Salish and Kootenai Tribes (CSKT) have been operating Lower Crow Dam under restricted reservoir levels since 2008 due to significant structural and spillway capacity deficiencies that have increased risk to dam safety. Stantec was contracted by the CSKT to evaluate rehabilitation options and provide final design for the new spillway. The focus of this paper is to describe the design methodology and spillway selection process with an emphasis on the hydraulic modeling completed to support the final spillway arrangement. The design approach included the evaluation of various spillway types including gated, Obermeyer, fuse gate, ogee, labyrinth, and piano …

2018 - Appalachian Student Research Forum Award Winners, Appalachian Student Research Forum, East Tennessee State University

Appalachian Student Research Forum

No abstract provided.

2018 - Appalachian Student Research Forum Program Booklet, Appalachian Student Research Forum, East Tennessee State University

Appalachian Student Research Forum

No abstract provided.

Design Approach For Labyrinth Weir: Case Study Of La Laye Dam, M. Roy, S. Derrien, J. Schaguene, G. Dautois

4th International Workshop on Labyrinth and Piano Key Weirs

This paper presents ARTELIA’s gradual approach for the design and construction of labyrinth weirs, from the preliminary concept design to the commissioning. It is illustrated with the case of La Laye dam, where an additional lateral spillway with labyrinth weir has been developed to increase the existing discharge capacity. The design process involved preliminary hydraulic calculations, 3D numerical modeling and a physical scale model. The paper elaborates on the technical solutions and optimizations which were considered to provide the Client with the most hydro-economical solution.

Advances In Arced Labyrinth Weir Research And Application At The Springton Spillway Project, Seth Thompson, Blake Tullis, Brian M. Crookston

4th International Workshop on Labyrinth and Piano Key Weirs

Arced labyrinth weirs, characterized by a curved cycle orientation, can enhance discharge efficiency compared to linear labyrinth weirs by taking advantage of the approaching flow field in reservoirs. This paper summarizes some of the Utah State University arced labyrinth weir hydraulic efficiency research findings, including sidewall and cycle arc angle influences, nappe aeration, and local submergence. Recent CFD modeling that replicates some of the experimental findings is also highlighted, demonstrating CFD utility for design. The Springton Spillway project, owned by Aqua Pennsylvania, leveraged this research when designing a two-stage, eight-cycle arced labyrinth weir to replace an aging ogee crest spillway …

2022 - Appalachian Student Research Forum Program Booklet, Appalachian Student Research Forum, East Tennessee State University

Appalachian Student Research Forum

No abstract provided.

2019 - Appalachian Student Research Forum Program Booklet, Appalachian Student Research Forum, East Tennessee State University

Appalachian Student Research Forum

No abstract provided.

Piano Key Weir With Orifice Sluice, Dau Xuan Thuy

4th International Workshop on Labyrinth and Piano Key Weirs

In recent years, many Piano Key Weirs (PKW) have been built around the world. In Vietnam there are more than 18 PKWs in operation to the present. However, during the operation, some experience has been drawn on the design and application conditions. This paper is about the Dak Mi 3 reservoir with a PKW that operated well for more than 4 years until an exceptional flood following typhoons in October 2020, making reservoir fully filled with mud and sand. The result is the PKW became ineffective and the hydropower plant unable to operate. In order to dredge the reservoir and …

Honey, I Shrunk The Pk Weir: A Case Study Of Burton Pond Dam, David Bisio

4th International Workshop on Labyrinth and Piano Key Weirs

Between a low-head tidal environment, razor-thin hydraulic margins, and a long list of site restrictions, the Burton Pond Dam Rehabilitation project offered the chance to pursue a one-of-a-kind solution: a miniature stainless steel piano key weir as part of a new mixed active-passive spillway. This case study will explore how established hydraulic designs were modified specifically for the site and verified with computational flow dynamics; how the innovative cantilevered geometry was analyzed structurally with finite element modeling; and how detailing, fabrication and constructability were considered throughout the design process. From conceptual-level design submissions to the final construction walkthrough, the whole …

Parents’ Dispositions On Social Emotional Learning And Their Policy Imperatives: The Relevance Of Context/Locality, Nicholas O. Alozie, Megan Armstrong, Kathy Thomas

Journal of Public Management & Social Policy

none

Research And Application Of Piano Key Weirs In Vietnam (2025), M. Ho Ta Khanh, Dau Xuan Thuy

4th International Workshop on Labyrinth and Piano Key Weirs

Since the Piano Key Weirs (PKW) were introduced by F. Lempérière and A. Ouamane (2003) many such structures have been built for irrigation, hydroelectricity and water regulation due to their outstanding efficiency. In Vietnam, PKWs have also attracted significant attention. There have been several laboratory hydraulic model studies to test the discharge capacity, flow characteristics, and energy dissipation downstream the spillway. Vietnam had also issued PKW design standard for easy of application in 2018. This paper describes shortly 18 Piano Key Weirs in operation in Vietnam (among other existing PKWs) : Dak Mi 4B, Dak Mi 3, Dak Rong 3, …

Lessons Learned From The Hydraulic Design Of The Prado Dam Labyrinth Spillway, Yajayra Diaz, Mike Phillips, Brian M. Crookston, Julie D. Allen

4th International Workshop on Labyrinth and Piano Key Weirs

The U.S. Army Corps of Engineers has completed the design of a new labyrinth weir spillway at Prado Dam, in southern California. The proposed labyrinth weir would consist of an arced configuration, 7-cycles, with varying weir wall height from 28 ft to 41 ft with upstream head over the weir cycles of up to 30 ft. This paper highlights the key lessons learned from the hydraulic design of the new labyrinth weir, including significant fluctuating negative pressures at the weir wall resulting in hydrodynamic loads that should be considered during structural design and submergence of the weir at high heads.

From A Shtetl House To An Urban Apartment: The Soviet Jewish Home Negotiated, Transformed, And Reimagined, Anna Kushkova

Jewish Folklore and Ethnology

This essay argues that despite the powerful forces of assimilation, official campaigns against Jewish religion/languages, and grassroots/state antisemitism, the “Jewish home” did not disappear, as is sometimes assumed, but continued to present a site of Jewish ethnic production and transmission, creativity, and resistance during the Soviet regime. In the Soviet Union, especially in the postwar period, Jewish ethnic culture was forced to leave the public sphere, where it became unwelcome and even dangerous, and withdrew into the less visible space of domestic interiors. The degree of Jewish public presence varied geographically: the situation was generally better in the Baltic Republics, …

Abundance And Distribution Of An Exceptional Number Of Red-Necked Grebes In Western Lake Ontario During Spring 2019, Ross W. Wood, Shannon S. Badzinski, Barbara A. Campbell, Brigitte Collins, Shawn W. Meyer, Denby Sadler

Ontario Birds

The Red-necked Grebe is a regular spring migrant on the Great Lakes and occasionally observed in very large numbers, particularly along the northwestern shore of Lake Ontario. Aerial surveys were flown to document abundance, distribution and habitat use of waterfowl and conspicuous waterbirds along the Ontario shorelines of the lower Great Lakes. On 7 April 2019, we observed a very large number of Red-necked Grebes, estimated at 12,395 individuals, concentrated in western Lake Ontario. The majority of these birds were located offshore along a 20 km span of shoreline between Frenchman’s Bay (Pickering, Ontario) and Bluffer’s Beach (Scarborough, Ontario). However, …

Full Issue, Ontario Field Ornithologists

Ontario Birds

No abstract provided.

Feeding Niche Overlap And Segregation Among Three Grouse Species Wintering In Hudson Bay Lowlands Of Northern Ontario, Vernon G. Thomas

Ontario Birds

The Hudson Bay Lowlands of northern Ontario (comprising tundra and taiga) provide winter habitats for Willow Ptarmigan and Sharp-tailed Grouse as well as Rock Ptarmigan that occasionally fly in from arctic and subarctic regions. Winter food niche segregation/overlap was measured among these three species to investigate potential feeding competition; tamarack and berries were quantified by number and mass in the crops of grouse collected from the vicinity of the former community of Winisk, Ontario (now Peawanuck). All grouse species fed on birch and it was the principal food for Sharp-tailed Grouse. Willow was eaten primarily by Willow and Rock Ptarmigan. …

2025 - Dr. Jay W. Boland Research Day Oral Award Winners, Dr. Jay W. Boland Research Day, East Tennessee State University

Dr. Jay W. Boland Research Day

No abstract provided.

Let's Talk Research: Siuc Open Data & Open Access Support Resources, Andrea Imre, Jess Herzog

Conference Papers and Presentations

No abstract provided.

What Do Students Read? Let’S Talk About Data-Informed Library Collections Planning For Student Success, Nat Gustafson-Sundell, Heidi J. Southworth, Evan Rusch

Library Services Publications

Do students read? What do they read? What kinds of information resources are most used by students? What subject areas are most used by students? What do they need from their library if they are going to complete assignments? How can the library plan ahead to meet student needs? The modern academic library is mostly online and highly data driven. The MSU Library Services Collection Management Technology team briefly demonstrated some of the tools they’ve developed to understand student needs. They showcased some of the instruments they’ve used to communicate collections plans to administration, as they’ve strategized to conform to …

Dairy And Food Science Student Newsletter, October 8, 2025, Department Of Dairy And Food Science

Dairy and Food Science Student Newsletter

No abstract provided.

Time-Dependent Radiation Induced Conductivity Of Polyimide: Effects Of Dose Rate And Temperature On Dynamic Ric, Tyler Heggenes, Jenny R. Whiteley, Jodie Gillespie, Jr Dennison

Journal Articles

Radiation induced conductivity (RIC) can impact charge dissipation within highly insulating materials used in spacecraft in harsh space plasma environments. Previous Utah State University (USU) research analyzed only the equilibrium portions of an extensive RIC database for polymeric materials, including Kapton HN (Trademark). This confirmed that equilibrium RIC follows a standard theoretical model that is temperature and dose rate dependent. The current study provides a new analysis of RIC’s time-dependent behavior of the Kapton HN data from this database. With the onset of radiation, the material response is characterized by an exponential increase in conductivity, while a hyperbolic inverse time-dependent …

The Minutes Of The Marshall University Board Of Governors Meeting, October 08, 2025, Marshall University Board Of Governors

Board of Governors Minutes

No abstract provided.

Gender Diversity, Substance Cognitions, And Alcohol, Nicotine/Tobacco, And Cannabis Use Among Youth, Luisa Kcomt, Philip T. Veliz, John Jardine, Rebecca J. Evans-Polce, Jennifer Clift, Sean Esteban Mccabe, Cynthia Arslanian-Engoren

Social Work Faculty Publications

Purpose: We aimed to classify youth using a longitudinal, multidimensional construct of gender, and examine associations of gender subgroups with substance cognitions and substance use.

Methods: We used data from the Adolescent Brain Cognitive Development Study (N=11,868 youth ages 9-10 years at baseline [2016-2018] through the year 4 follow-up [ages 13-14 years, 2020-2022]) to conduct latent class models using measures of gender identity, felt gender, gender expression, and gender non-contentedness. We used multivariable logistic regression to assess associations of gender classes with curiosity to use, intention to use, and use of alcohol, nicotine/tobacco, and cannabis, respectively, adjusting for sociodemographic factors. …

The Lumberjack, October 08, 2025

Cal Poly Humboldt's Student Newspaper

The student newspaper of Humboldt State University.