scholarly journals Houston Ship Channel Expansion Improvement Project – Navigation Channel Improvement Study : ship simulation results

2021 ◽  
Author(s):  
S. Martin ◽  
Larry Daggett ◽  
Morgan Johnston ◽  
Chris Hewlett ◽  
Kiara Pazan ◽  
...  
Keyword(s):  
Wind Waves ◽  
Real Life ◽  
Improvement Project ◽  
Us Army ◽  
Navigation Channel ◽  
The Us ◽  
Final Design ◽  
Online Simulations ◽  
Houston Ship Channel ◽  
Hydraulics Laboratory

In 2020, the US Army Engineer Research and Development Center (ERDC), Coastal and Hydraulics Laboratory, provided technical oversight during a navigation study to assist the Galveston District evaluation of different channel widening alternatives for larger ships transiting the Houston Ship Channel (HSC), Texas. The widening proposals encompassed several areas of the HSC including the Bay Section, the Bayport Ship Channel, Barbours Cut Channel, and the Bayou Section. The study was performed at the San Jacinto College Maritime Technology and Training Center (SJCMTTC) Ship/Tug Simulator (STS) Facility in La Porte, TX. The SJCMTTC STS is a real-time simulator; therefore, events on the simulator happen at the same time rate as real life. A variety of environmental forces act upon the ship during the simulation transit. These include currents, wind, waves, bathymetry, and ship-to-ship interaction. Online simulations of the project were conducted at SJCMTTC over a 3-week period – May through June 2020. Several mariners including Houston Pilots and G&H tugboat Captains participated in the testing and validation exercises. ERDC oversight was performed remotely because of the COVID-19 pandemic. Results in the form of engineering observations, track plots, and pilot interviews were reviewed to develop final conclusions and recommendations regarding the final design.

scholarly journals Houston Ship Channel Expansion Channel Improvement Project (ECIP) numerical modeling report : BABUS cell and Bird Island analysis

2021 ◽  
Author(s):  
Jennifer McAlpin ◽  
Cassandra Ross
Keyword(s):  
The United States ◽  
Residual Velocity ◽  
Improvement Project ◽  
Us Army ◽  
The Us ◽  
Transport Analysis ◽  
The Mean ◽  
Houston Ship Channel ◽  
Hydraulics Laboratory ◽  
Development Center

The Houston Ship Channel (HSC) is one of the busiest deep-draft navigation channels in the United States and must be able to accommodate increasing vessel sizes. The US Army Engineer District, Galveston (SWG), requested the Engineer Research and Development Center, Coastal and Hydraulics Laboratory, perform hydrodynamic and sediment modeling of proposed modifications in Galveston and Trinity Bays and along the HSC. The modeling results are necessary to provide data for hydrodynamic, salinity, and sediment transport analysis. SWG provided three project alternatives that include closing Rollover Pass, Bay Aquatic Beneficial Use System cells, Bird Islands, and HSC modifications. These alternatives and a Base (existing condition) will be simulated for present (2029) and future (2079) conditions. The results of these alternatives/conditions as compared to the Base are presented in this report. The model shows that the mean salinity varies by 2–3 ppt due to the HSC channel modifications and by approximately 5 ppt in the area of East Bay due to the closure of Rollover Pass. The tidal prism increases by 2.5% to 5% in the alternatives. The tidal amplitudes change by less than 0.01 m. The residual velocity vectors vary in and around areas where project modifications are made.

scholarly journals Brunswick Harbor numerical model

2021 ◽  
Author(s):  
Jennifer McAlpin ◽  
Jason Lavecchia
Keyword(s):  
Army Corps ◽  
Army Corps Of Engineers ◽  
Engineer Research ◽  
Corps Of Engineers ◽  
Us Army ◽  
Navigation Channel ◽  
The Us ◽  
Model Setup ◽  
Hydraulics Laboratory ◽  
Development Center

The Brunswick area consists of many acres of estuarine and marsh environments. The US Army Corps of Engineers District, Savannah, requested that the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, develop a validated Adaptive Hydraulics model and assist in using it to perform hydrodynamic modeling of proposed navigation channel modifications. The modeling results are necessary to provide data for ship simulation. The model setup and validation are presented here.

Rapid Operational Access and Maneuver Support platform for military logistics and operation planning in water environments

2018 ◽  
Vol 15 (4) ◽  
pp. 437-447
Author(s):  
Drew Allan Loney ◽  
Kimberly Collins Pevey ◽  
Jennifer Tate McAlpin ◽  
Benjamin Wright Nelsen ◽  
Brent Harry Hargis
Keyword(s):  
Water Environment ◽  
Environmental Data ◽  
Limited Information ◽  
Us Army ◽  
The Us ◽  
Imperfect Knowledge ◽  
Path Search ◽  
Hydraulics Laboratory ◽  
Development Center

Logistical and combat operations in riverine, estuarine, and coastal environments remain a key military focus due to limited maneuverability, imperfect knowledge, and rapidly changing constraints. Vessel operation in water environments can be enhanced by routing algorithms that integrate mission parameters with environmental data and vessel specifications. These algorithms must update predetermined routes in a timely manner as parameters and specifications change. The US Army Engineer Research and Development Center Coastal and Hydraulics Laboratory is developing the capability for military planners to rapidly optimize vessel routes in water environments by extending capabilities of the Rapid Operational Access and Maneuver Support (ROAMS) modeling platform. The ROAMS platform allows users to rapidly generate models of a water environment in limited-information conditions, utilizing the Adaptive Hydraulics and STeady-state spectral WAVE computational engines for the base two-dimensional hydrodynamics and waves, respectively. Routing capabilities are built on path search and penalty-barrier optimization to automatically produce routes that account for temporally changing environmental variables and vessel maneuverability. This work outlines the components of the ROAMS routing package and presents a case study using ROAMS in a northeastern American metropolitan area. Benefits and limitations of the ROAMS routing platform are discussed and future improvements are suggested.

Rough River Outlet Works physical model study

2021 ◽  
Author(s):  
Jeremy Sharp ◽  
Locke Williams ◽  
Duncan Bryant ◽  
Jake Allgeier ◽  
Kevin Pigg ◽  
...  
Keyword(s):  
Physical Model ◽  
Hydraulic Performance ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Structure Transition ◽  
Us Army ◽  
Model Study ◽  
Design Changes ◽  
The Us ◽  
Hydraulics Laboratory

The US Army Corps of Engineers, Louisville District, requested the support and assistance of the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory (CHL), in the evaluation of the hydraulic performance of the replacement Outlet Works for Rough River Dam. To support the design effort, CHL constructed a 1:25.85 scale physical model. The proposed features of the model in the domain are the curved approach channel, intake structure, transition, curved conduit, stilling basin, concrete apron, and retreat channel. Tests performed to evaluate the hydraulic performance illuminated a few design concerns. To address these issues, several key design changes were made. These included the retreat channel slope, end sill design, and transition design.

scholarly journals Field measurement and monitoring of hydrodynamic and suspended sediment within the Seven Mile Island Innovation Laboratory, New Jersey

2021 ◽  
Author(s):  
Kelsey Fall ◽  
David Perkey ◽  
Zachary Tyler ◽  
Timothy Welp
Keyword(s):  
New Jersey ◽  
Suspended Sediment ◽  
Management Practices ◽  
Material Management ◽  
Us Army ◽  
The Us ◽  
Suspended Sediment Concentrations ◽  
Northern Portion ◽  
Wind Events ◽  
Hydraulics Laboratory

The Seven Mile Island Innovation Laboratory (SMIIL) was launched in 2019 to evaluate beneficial use of dredge material management practices in coastal New Jersey. As part of that effort, the Philadelphia District requested that the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, collect data to characterize the hydrodynamics and turbidity within the central portions of the SMIIL prior to and during dredge material placement. Pre-dredge monitoring found that apart from punctuated wind events, the study area waters were generally calm and clear with small waves, <0.25 m, slow current speeds (~0.1 m/s), low turbidity (~10 ntus), and low suspended sediment concentrations (~10–20 mg/L). In March 2020, 2,475 m³ of dredged sediment was placed on the northern portion of Sturgeon Island within the SMIIL. Turbidity in the waters surrounding the island was monitored to quantify extent of the sediment plume resulting from the placement. Observations found little to no turbidity plume associated with the dredging operations beyond 20 m from the island and that the plume was largely limited to areas near a tidal creek draining the placement area. Additionally, turbidity levels quickly returned to background conditions at times when the dredge was not in operation.

Houston Ship Channel Expansion Channel Improvement Project (ECIP) Numerical Modeling Report : Increased Channel Width Analysis

2021 ◽  
Author(s):  
Jennifer N. McAlpin ◽  
Cassandra G. Ross
Keyword(s):  
The United States ◽  
Simulation Studies ◽  
Residual Velocity ◽  
Improvement Project ◽  
Transport Analysis ◽  
Houston Ship Channel ◽  
Hydraulics Laboratory ◽  
Development Center ◽  
The U.S ◽  
Additional Channel

The Houston Ship Channel is one of the busiest deep -draft navigation channels in the United States and must be able to accommodate larger vessel dimensions over time. The U.S. Army Engineer District, Galveston (SWG) requested the U.S. Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory perform hydrodynamic and sediment modeling of proposed modifications along the Houston Ship Channel. The modeling results are necessary to provide data for salinity and sediment transport analysis a s well as ship simulation studies. SWG provided a project alternative that includes channel widening, deepening, and bend easing. After initial analysis, two additional channel widths in the bay portion of the Houston Ship Channel were requested for testing. The results of these additional channel widths are presented in this report. The model shows that the salinity does not vary significantly due to the channel modifications being considered for this project. Changes in salinity are 2 parts per thousand or less. The tidal prism increases by less than 2% when the project is included, and the tidal amplitudes increase by no more than 0.01 meter. The residual velocity vectors do vary in and around areas where project modifications are made.

Neuro-Optometric Treatment of Complications from a Cerebellar Astrocytoma

2020 ◽  
pp. 304-312
Keyword(s):  
Visual System ◽  
Common Site ◽  
Us Army ◽  
Cranial Nerve Palsies ◽  
Pilocytic Astrocytomas ◽  
The Us ◽  
Extent Of Damage ◽  
Functional Components ◽  
The Brain

Background: Insult to the brain, whether from trauma or other etiologies, can have a devastating effect on an individual. Symptoms can be many and varied, depending on the location and extent of damage. This presentation can be a challenge to the optometrist charged with treating the sequelae of this event as multiple functional components of the visual system can be affected. Case Report: This paper describes the diagnosis and subsequent ophthalmic management of an acquired brain injury in a 22 year old male on active duty in the US Army. After developing acute neurological symptoms, the patient was diagnosed with a pilocytic astrocytoma of the cerebellum. Emergent neurosurgery to treat the neoplasm resulted in iatrogenic cranial nerve palsies and a hemispheric syndrome. Over the next 18 months, he was managed by a series of providers, including a strabismus surgeon, until presenting to our clinic. Lenses, prism, and in-office and out-of-office neurooptometric rehabilitation therapy were utilized to improve his functioning and make progress towards his goals. Conclusions: Pilocytic astrocytomas are the most common primary brain tumors, and the vast majority are benign with excellent surgical prognosis. Although the most common site is the cerebellum, the visual pathway is also frequently affected. If the eye or visual system is affected, optometrists have the ability to drastically improve quality of life with neuro-optometric rehabilitation.

EDUCATIONAL-TRAINING FACILITIES OF GROUND US FORCES

2019 ◽  
pp. 168-176
Author(s):  
D.B. Izyumov ◽  
E.L. Kondratyuk
Keyword(s):  
United States ◽  
Armed Forces ◽  
The United States ◽  
Educational Training ◽  
Us Army ◽  
The Us ◽  
Level Of Training ◽  
Army Personnel

The article discusses issues related to the development and use of training means and facilities in order to improve the level of training of US Army personnel. An overview of the main simulators used in the US Armed Forces at present is given, and the prospects for the development of the United States in this area are presented.

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