Tate O. McAlpin

U.S. Army Engineer Research and Development Center

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Gaurav Savant

U.S. Army Engineer Research and Development Center

Keaton Jones

U.S. Army Engineer Research and Development Center

David Abraham

U.S. Army Engineer Research and Development Center

Daniel G. Wren

National Sedimentation Laboratory

Roger A. Kuhnle

National Sedimentation Laboratory

Corey J. Trahan

U.S. Army Engineer Research and Development Center

Mary A. Cialone

U.S. Army Engineer Research and Development Center

Brittany L. Gunkel

Kimberly Pevey

U.S. Army Engineer Research and Development Center

Charlie Berger

U.S. Army Engineer Research and Development Center

Cooperative Institutions

U.S. Army Engineer Research and Development Center

United States Army Corps of Engineers

United States Army

United States Department of the Army

University of Iowa

U.S. Army Corp of Engineers Waterways Experiment Station

National Sedimentation Laboratory

Agricultural Research Service

United States Department of Agriculture

Dankook University

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Urban and overland flow modeling with dynamic adaptive mesh and implicit diffusive wave equation solver

Journal of Hydrology (2019)

Gaurav Savant Corey J. Trahan Lucas Pettey Tate O. McAlpin Gary Bell

Solver

Shallow water equations

Adaptive Mesh Refinement

Dam break

10.1016/j.jhydrol.2019.03.061

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Citations (32)

Reply on AC4

Gaurav Savant Tate O. McAlpin

Abstract. The knowledge of timescales of flushing processes within an estuary is essential for the health, and productivity of the estuary, as well as for optimum estuarine management. The hydrodynamics, flushing times, and freshwater age within Mobile Bay were investigated using a three-dimensional (3D) numerical model, Adaptive Hydraulics. Bay flushing and freshwater times were analyzed for various freshwater flow conditions, wind conditions and investigated the influence of the Coriolis force. The flushing times were directly related to the magnitude of freshwater inputs to the system, with the bay exhibiting an average flushing time of 16.5 days for average river inflows. Freshwater age in the bay was closely associated with the freshwater inflows as well as with location in the Bay and varied from 2 days in the Upper Bay to 21 days in the Lower Bay for average river inflows. Northerly, Easterly, and Westerly winds play an enabling role in the flushing process, with lower depth-averaged flushing times compared to those without winds, with Northerly and Easterly winds being the most efficient. Southerly winds increase flushing times by changing the circulation patterns in the Bay.

Flushing

Hydraulics

10.5194/egusphere-2022-199-rc5

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Tidal Hydrodynamics in the Lower Columbia River Estuary through Depth Averaged Adaptive Hydraulics Modeling

Journal of Engineering (2014)

Gaurav Savant Tate O. McAlpin

The adaptive hydraulics (AdH) numerical code was applied to study tidal propagation in the Lower Columbia River (LCR) estuary. The results demonstrate the readiness of this AdH model towards the further study of hydrodynamics in the LCR. The AdH model accurately replicated behavior of the tide as it propagated upstream into the LCR system. Results show that the MSf tidal component and the M4 overtidal component are generated in the middle LCR and contain a substantial amount of tidal energy. An analysis was performed to determine the causes of MSf tide amplification, and it was found that approximately 80% of the amplification occurs due to nonlinear interaction between the M2 and the S2 tidal components.

Hydraulics

Tidal river

10.1155/2014/416914

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Citations (6)

Morganza to the Gulf of Mexico Floodgate Study

Tate O. McAlpin Ian Floyd Christopher Callegan Thad C. Pratt Danielle M Washington

Abstract : The U.S. Army Engineer District, New Orleans, is in the process of determining the correct sizing for sail-through structures to be constructed along the new proposed Morganza to the Gulf levee system in southern Louisiana. In the aftermath of Hurricane Katrina, numerous new levees are being constructed to reduce the risk of storm-induced flooding. In addition to the economic and loss of life impact of such flooding, there is also a significant negative impact on the local ecosystem. At the request of the New Orleans District, the U.S. Army Engineer Research and Development Center (ERDC) performed a number of engineering studies in support of efforts to determine the proper sizes of six proposed structures (Bush Canal, Bayou Terrebonne, Lapeyrouse Canal, Placid Canal, Bayou Petit Caillou, and Humble Canal). The Adaptive Hydraulics model, AdH, was used to investigate the circulation tendencies in and around the proposed structure locations for the Morganza to the Gulf of Mexico project utilizing its two-dimensional shallow-water module. This study characterizes existing water levels and currents in the vicinity of the six proposed structures and predicts any potential impacts that may result. Comparing model-generated currents and water-surface elevations between pre- and postconstruction conditions provides insight into whether a particular alternative will adversely impact velocity conditions. AdH was used to develop time varying current fields for the base and plan conditions.

Hydraulics

Source

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Uncertainty for the ISSDOTv2 Bedload Measurement Method

Journal of Hydraulic Engineering (2023)

Tate O. McAlpin Daniel G. Wren Keaton Jones David Abraham Roger A. Kuhnle

The Integrated, Section Surface Difference Over Time, version 2 (ISSDOTv2) method provides a means of quantifying bedload in large sandbed rivers. Like all measurements, it is important to understand the uncertainty associated with the method before making management decisions based on its results. A methodology is presented for quantifying and combining the uncertainty for each component of the ISSDOTv2 method including particle density, bed porosity, acoustically measured bed topography, the timing of measurements, sand wave identification, and regression analysis used for geometric correction of bedload measurements. The approach provides an indication of the relative magnitude of each source of uncertainty in addition to the uncertainty in the final resultant transport rate. Laboratory flume measurements were used to evaluate the uncertainty limits and verify the approach. The greatest contributor to uncertainty was found to be the bathymetric uncertainty, and, at the highest transport rates, cumulative relative uncertainty was found to be approximately 10%. Cumulative relative uncertainties grew rapidly with decreasing flow rates, driven primarily by the higher relative contribution of the effect of bathymetric uncertainty on the smaller bedforms that are typically present at lower transport rates. The approach documented here will be transferrable to real-world systems to determine the uncertainty in measured bedload sediment transport rates using the ISSDOTv2 method.

Flume

Bedform

Uncertainty Quantification

10.1061/jhend8.hyeng-13505

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Citations (1)

Sediment Transport and Bed Topography for Realistic Unsteady Flow Hydrographs of Varying Length in a Laboratory Flume

Journal of Hydraulic Engineering (2024)

Daniel G. Wren Roger A. Kuhnle Eddy J. Langendoen Tate O. McAlpin

Complex interactions between flowing water and bedforms in rivers with sand beds during changing flow rates may result in bedforms, flow resistance, and sediment transport rates that differ on the rising and falling limbs of flow hydrographs. To study this phenomenon, laboratory experiments based on six realistically shaped hydrographs with durations of 1–6 h in 1-h increments were performed in a recirculating flume at the United States Department of Agriculture-Agricultural Research Service (USDA-ARS) National Sedimentation Laboratory. Bed topography, water-surface slope, flow rate, and sediment transport rate were continuously monitored. Counterclockwise hysteresis between discharge and sediment transport rate as well as bedform dimensions were observed for all hydrograph lengths, and the magnitude of hysteresis was quantified. The amount of hysteresis in transport rate, bedform amplitude, and bedform length varied according to the length of the hydrograph, although the relationship was not monotonic. The Engelund–Hansen method was able to approximately predict sediment transport rates based on measured hydraulic parameters. Maximum bedform amplitudes increased with hydrograph length, while bedform lengths increased only minimally beyond the 4-h hydrograph period.

Flume

Bedform

Hydraulics

Hyperconcentrated flow

10.1061/jhend8.hyeng-13769

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Reply on AC5

Gaurav Savant Tate O. McAlpin

Flushing

Hydraulics

10.5194/egusphere-2022-199-rc6

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North Atlantic Coast Comprehensive Study (NACCS) coastal storm model simulations : waves and water levels

This Digital Resource was created in Microsoft Word and Adobe Acrobat (2015)

Mary A. Cialone Thomas C. Massey Mary E. Anderson Alison Sleath Grzegorzewski Robert E. Jensen

Abstract : This document summarizes the coastal storm wave and water level modeling effort performed in support of the North Atlantic Coast Comprehensive Study (NACCS). This effort involved the application of a suite of high-fidelity numerical models within the Coastal Storm Modeling System (CSTORM-MS). The study was conducted to provide information for computing the joint probability of coastal storm environmental forcing parameters for the U.S. North Atlantic Coast (NAC) because this information is critical for effective flood risk management project planning, design, and performance evaluation. CSTORM-MS modeling produced nearshore wind, wave, and water level estimates and the associated marginal and joint probabilities. Documentation of the statistical evaluation is provided in the companion report North Atlantic Coast Comprehensive Study (NACCS) Coastal Storm Hazards from Virginia to Maine (Nadal-Caraballo et al. 2015). In this study, both tropical and extratropical storms were strategically selected to characterize the regional storm hazard. CSTORM-MS was then applied with the wave generation and propagation model WAM, providing offshore, deep-water waves to apply as boundary conditions to the nearshore steady-state wave model STWAVE, ADCIRC to simulate the surge and circulation response to the storms, and STWAVE to provide nearshore wave conditions including local wind -generated waves. Products of this study are intended to close data gaps required for flood risk management analyses by providing statistical wave and water level information for the NAC within the Coastal Hazards System (CHS). The CHS is expected to provide cost and study time efficiencies and a level of regional standardization for project studies.

Storm Surge

Coastal hazards

Significant wave height

Wave height

Coastal flood

Wave model

Extratropical cyclone

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Citations (41)

Numerical Modeling Studies Supporting Port of Anchorage Deepening and Expansion: Part III; Numerical Hydrodynamic Modeling

Estuarine and Coastal Modeling (2010)

R. S. Chapman Kenneth J. Eisses Tate O. McAlpin

The US Army Engineer Alaska District is currently assessing hydrodynamic and port sedimentation issues associated with proposed expansion and deepening of Port of Anchorage. Port of Anchorage is located in lower Knik Arm of Cook inlet, Alaska. A series of numerical hydrodynamic simulations were performed to assess the impact of the proposed expansion configuration on circulation within the port. Critical to the understanding of the hydrodynamic transport processes within and around the port, is the formation, strength and evolutions of eddies formed during all phases of the tide. Initial comparisons of model predictions with field measures suggested the need to improve upon an existing grid and the lateral eddy viscosity formulations. Subsequent to these improvements, good agreement between the formation of the eddies and field measurements was achieved.

Port (circuit theory)

Eddy

Sedimentation

Numerical models

Turbulence Modeling

10.1061/41121(388)19

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Citations (1)

Bed-Load Validation for ISSDOTv2

Journal of Hydraulic Engineering (2022)

Tate O. McAlpin Daniel G. Wren Keaton Jones David Abraham Roger A. Kuhnle

Bed-load transport is an important process impacting riverine morphology, but until recently it has proven difficult to measure in large sand-bed rivers. Integrated Section, Surface Difference Over Time, version 2 (ISSDOTv2) method provides a means of quantifying the bed load in large sand-bed rivers. A series of flume experiments, which included frequent measurements of bed topography and an independent measurement of bed load across a range of flows, was used to provide validation for the ISSDOTv2 method. The mean difference between the ISSDOTv2 calculations and the estimated bed load was 5.6% (high flow), 12.9% (medium flow), and 56% (low flow), indicating improved accuracy for higher flow and transport conditions. It was also found that the ISSDOTv2 method responded appropriately to rapid step-downs in flow, as indicated by agreement between ISSDOTv2 load results and accompanying independent measurements of bed load.

Flume

Bedform

Flow conditions

Hydraulics

10.1061/(asce)hy.1943-7900.0001968

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Citations (8)