Ehab Meselhe - Academia.edu (original) (raw)

Papers by Ehab Meselhe

Research paper thumbnail of Effect of Radar-Rainfall Errors on Rainfall-Runoff Modeling

World Environmental and Water Resources Congress 2007, 2007

Research paper thumbnail of HYDRODYNAMIC AND WATER QUALITY MODEL ARTHUR R. MARSHALL LOXAHATCHEE NATIONAL WILDLIFE REFUGE

It is well known that changes in water quantity, timing and quality are introducing negative impa... more It is well known that changes in water quantity, timing and quality are introducing negative impacts to the Everglades ecosystem. The changes in natural timing of water levels affect wading birds feeding patterns, apple snail reproductive output, and alligator nesting. Similarly, changes in the spatial distribution of water levels alter the distribution of aquatic vegetation and tree islands. Along with

Research paper thumbnail of Multi-Instrumental Measurement of Bedload Transport and Turbulent Resuspension over Lateral Sand Bars in the Lower Mississippi River

Two reaches of the lower Mississippi River at Myrtle Grove, LA (river kilometer 95-100 above Head... more Two reaches of the lower Mississippi River at Myrtle Grove, LA (river kilometer 95-100 above Head of Passes) and Magnolia, LA (river kilometer 72-76) were examined during rising river discharge in April (23,800 cms) and May (19,300 cms) 2010 using a multi-instrumental approach to observe the dynamics of bedload transport and turbulent resuspension over lateral river sand bars. The key

Research paper thumbnail of MORGANZA-TO-THE-GULF TECHNICAL PANEL REVIEW

Research paper thumbnail of HYDRODYNAMICS AND SEDIMENT TRANSPORT IN LOWER MISSISSIPPI RIVER MEANDER BENDS (LOUISIANA): IMPLICATIONS FOR LARGE SEDIMENT DIVERSIONS

Field data collection and numerical modeling is being conducted in the lower Mississippi River in... more Field data collection and numerical modeling is being conducted in the lower Mississippi River in the region of a meander bend at Myrtle Grove, LA (river km 96 above Head of Passes) in support of a proposed large water and sediment diversion (1,130-2,830 cms) for coastal wetland restoration. Field studies in October 2008, April and May 2009, at discharges ranging

Research paper thumbnail of Simulation Management Systems Developed by the Northern Gulf Coastal Hazards Collaboratory (NG-CHC): An Overview of Cyberinfrastructure to Support the Coastal Modeling Community in the Gulf of Mexico

Coastal Research Library, 2014

ABSTRACT Given the significance of natural and built assets of the Gulf of Mexico region, the thr... more ABSTRACT Given the significance of natural and built assets of the Gulf of Mexico region, the three states of Alabama, Louisiana, and Mississippi, leveraged their unique partnerships, proximity, and significant prior investments in cyberinfrastructure (CI) to develop the Northern Gulf Coastal Hazards Collaboratory (NG-CHC). This collaboratory was established to catalyze collaborative research via enhanced CI to reduce the regions vulnerability to natural and human disasters by facilitating high performance modeling to test hypotheses focused on engineering design, coastal system response, and risk management of coastal hazards. The objective of the NG-CHC is to advance research and inspire collaboration through highly available innovation-enabling CI, with a particular focus on geosciences and engineering from the watershed to the coast. An integrated CI capable of simulating all relevant interacting processes is needed to implement a system that captures the dynamic nature of coastal surface processes. The NG-CHC has implemented CI to locate appropriate data and computational resources, create necessary workflows associated with different simulation demands, and provide visualization tools for analysis of results. Three simulation management systems, SIMULOCEAN, SULIS, and ASGS, were implemented, each with a defined suite of hypotheses and institutional participants to run collaborator experiments. The NG-CHC focused on developing suites of CI tools centered on handling the functional needs of each simulation management system in a collaborative environment. The NG-CHC also developed curriculum units, computer games and simulations to extend the knowledge of coastal hazards to students from middle school to college. Education and outreach activities were developed to increase public understanding and support for sustainable coastal practices. The elements of the CI tool box within NG-CHC describe generic tools needed to promote a ‘collaborative modeling environment’ in other coastal systems.

Research paper thumbnail of <title>Interactive exploration of coastal restoration modeling in virtual environments</title>

The Engineering Reality of Virtual Reality 2009, 2009

Research paper thumbnail of Adaptable web modules to stimulate active learning in engineering hydrology using data and model simulations

QScience Proceedings, 2014

Research paper thumbnail of Numerical Simulation of Transcritical Flow in Open Channels

Journal of Hydraulic Engineering-asce, 1997

... (1992) used a total variation diminishing (TVD) version of ... Page 4. spectral radius scalin... more ... (1992) used a total variation diminishing (TVD) version of ... Page 4. spectral radius scaling, which is routinely used in gas dynam-ics simulations, stems from the well-known relation between upwind and central differencing schemes when applied to a ... 1981) to open-channel flows ...

Research paper thumbnail of Invalidity of Preissmann Scheme for Transcritical Flow

Journal of Hydraulic Engineering-asce, 1997

Research paper thumbnail of Effect of rainfall spatial variability and sampling on salinity prediction in an estuarine system

Journal of Hydrology, 2008

Research paper thumbnail of Numerical modeling of hydrodynamics and sediment transport in lower Mississippi at a proposed delta building diversion

Journal of Hydrology, 2012

Research paper thumbnail of The use of large water and sediment diversions in the lower Mississippi River (Louisiana) for coastal restoration

Journal of Hydrology, 2010

... lower Mississippi River on the availability and accessibility of sediments, and the status of... more ... lower Mississippi River on the availability and accessibility of sediments, and the status ofsediment transport modeling and (2 ... The furthest downstream long-term (>50 y) gauging station on the Mississippi utilized to calculate both water and sediment discharge above ...

Research paper thumbnail of Effect of Local Errors of Tipping-Bucket Rain Gauges on Rainfall-Runoff Simulations

Journal of Hydrologic Engineering, 2008

Research paper thumbnail of Sensitivity of Conceptual and Physically Based Hydrologic Models to Temporal and Spatial Rainfall Sampling

Journal of Hydrologic Engineering, 2009

Research paper thumbnail of Water budget model for a remnant northern Everglades wetland

Journal of Hydraulic Research, 2010

ABSTRACT The Arthur R. Marshall Loxahatchee National Wildlife Refuge overlays Water Conservation ... more ABSTRACT The Arthur R. Marshall Loxahatchee National Wildlife Refuge overlays Water Conservation Area 1, a 580 km freshwater wetland remnant of the northern Everglades in Palm Beach County, Florida, USA. Changes in water quantity and quality have impacted the Refuge ecosystem. Ensuring appropriate management to maximize benefits for wildlife while meeting flood control and water supply needs is a refuge priority. The Simple Refuge Stage Model described herein supports these management decisions. The two-compartment model with a daily time step predicts temporal variations of water level in the refuge rim canal and interior marsh, based on observed inflows, outflows, precipitation and evapotranspiration. The model was used to evaluate various water management scenarios. The modelling approach applied herein may have utility in managing other wetland systems where over-bank flooding is a dominant mechanism, affecting hydrology and water quality.

Research paper thumbnail of Simulation of Unsteady Flow in Irrigation Canals with Dry Bed

Journal of Hydraulic Engineering, 1993

Research paper thumbnail of Surface Water Sulfate Dynamics in the Northern Florida Everglades

Journal of Environment Quality, 2009

Sulfate contamination has been identified as a serious environmental issue in the Everglades ecos... more Sulfate contamination has been identified as a serious environmental issue in the Everglades ecosystem. However, it has received less attention compared to P enrichment. Sulfate enters the Arthur R. Marshall Loxahatchee National Wildlife Refuge (Refuge), a remnant of the historic Everglades, in pumped stormwater discharges with a mean concentration of approximately 50 mg L(-1), and marsh interior concentrations at times fall below a detection limit of 0.1 mg L(-1). In this research, we developed a sulfate mass balance model to examine the response of surface water sulfate in the Refuge to changes in sulfate loading and hydrological processes. Meanwhile, sulfate removal resulting from microbial sulfate reduction in the underlying sediments of the marsh was estimated from the apparent settling coefficients incorporated in the model. The model has been calibrated and validated using long-term monitoring data (1995-2006). Statistical analysis indicated that our model is capable of capturing the spatial and temporal variations in surface water sulfate concentrations across the Refuge. This modeling work emphasizes the fact that sulfate from canal discharge is impacting even the interior portions of the Refuge, supporting work by other researchers. In addition, model simulations suggest a condition of sulfate in excess of requirement for microbial sulfate reduction in the Refuge.

Research paper thumbnail of Numerical Modeling of the Mississippi-Atchafalaya Rivers' Sediment Transport and Fate: Considerations for Diversion Scenarios

Journal of Coastal Research, 2010

Research paper thumbnail of Assessing Effects of Data Limitations on Salinity Forecasting in Barataria Basin, Louisiana, with a Bayesian Analysis

Journal of Coastal Research, 2007

Research paper thumbnail of Effect of Radar-Rainfall Errors on Rainfall-Runoff Modeling

World Environmental and Water Resources Congress 2007, 2007

Research paper thumbnail of HYDRODYNAMIC AND WATER QUALITY MODEL ARTHUR R. MARSHALL LOXAHATCHEE NATIONAL WILDLIFE REFUGE

It is well known that changes in water quantity, timing and quality are introducing negative impa... more It is well known that changes in water quantity, timing and quality are introducing negative impacts to the Everglades ecosystem. The changes in natural timing of water levels affect wading birds feeding patterns, apple snail reproductive output, and alligator nesting. Similarly, changes in the spatial distribution of water levels alter the distribution of aquatic vegetation and tree islands. Along with

Research paper thumbnail of Multi-Instrumental Measurement of Bedload Transport and Turbulent Resuspension over Lateral Sand Bars in the Lower Mississippi River

Two reaches of the lower Mississippi River at Myrtle Grove, LA (river kilometer 95-100 above Head... more Two reaches of the lower Mississippi River at Myrtle Grove, LA (river kilometer 95-100 above Head of Passes) and Magnolia, LA (river kilometer 72-76) were examined during rising river discharge in April (23,800 cms) and May (19,300 cms) 2010 using a multi-instrumental approach to observe the dynamics of bedload transport and turbulent resuspension over lateral river sand bars. The key

Research paper thumbnail of MORGANZA-TO-THE-GULF TECHNICAL PANEL REVIEW

Research paper thumbnail of HYDRODYNAMICS AND SEDIMENT TRANSPORT IN LOWER MISSISSIPPI RIVER MEANDER BENDS (LOUISIANA): IMPLICATIONS FOR LARGE SEDIMENT DIVERSIONS

Field data collection and numerical modeling is being conducted in the lower Mississippi River in... more Field data collection and numerical modeling is being conducted in the lower Mississippi River in the region of a meander bend at Myrtle Grove, LA (river km 96 above Head of Passes) in support of a proposed large water and sediment diversion (1,130-2,830 cms) for coastal wetland restoration. Field studies in October 2008, April and May 2009, at discharges ranging

Research paper thumbnail of Simulation Management Systems Developed by the Northern Gulf Coastal Hazards Collaboratory (NG-CHC): An Overview of Cyberinfrastructure to Support the Coastal Modeling Community in the Gulf of Mexico

Coastal Research Library, 2014

ABSTRACT Given the significance of natural and built assets of the Gulf of Mexico region, the thr... more ABSTRACT Given the significance of natural and built assets of the Gulf of Mexico region, the three states of Alabama, Louisiana, and Mississippi, leveraged their unique partnerships, proximity, and significant prior investments in cyberinfrastructure (CI) to develop the Northern Gulf Coastal Hazards Collaboratory (NG-CHC). This collaboratory was established to catalyze collaborative research via enhanced CI to reduce the regions vulnerability to natural and human disasters by facilitating high performance modeling to test hypotheses focused on engineering design, coastal system response, and risk management of coastal hazards. The objective of the NG-CHC is to advance research and inspire collaboration through highly available innovation-enabling CI, with a particular focus on geosciences and engineering from the watershed to the coast. An integrated CI capable of simulating all relevant interacting processes is needed to implement a system that captures the dynamic nature of coastal surface processes. The NG-CHC has implemented CI to locate appropriate data and computational resources, create necessary workflows associated with different simulation demands, and provide visualization tools for analysis of results. Three simulation management systems, SIMULOCEAN, SULIS, and ASGS, were implemented, each with a defined suite of hypotheses and institutional participants to run collaborator experiments. The NG-CHC focused on developing suites of CI tools centered on handling the functional needs of each simulation management system in a collaborative environment. The NG-CHC also developed curriculum units, computer games and simulations to extend the knowledge of coastal hazards to students from middle school to college. Education and outreach activities were developed to increase public understanding and support for sustainable coastal practices. The elements of the CI tool box within NG-CHC describe generic tools needed to promote a ‘collaborative modeling environment’ in other coastal systems.

Research paper thumbnail of <title>Interactive exploration of coastal restoration modeling in virtual environments</title>

The Engineering Reality of Virtual Reality 2009, 2009

Research paper thumbnail of Adaptable web modules to stimulate active learning in engineering hydrology using data and model simulations

QScience Proceedings, 2014

Research paper thumbnail of Numerical Simulation of Transcritical Flow in Open Channels

Journal of Hydraulic Engineering-asce, 1997

... (1992) used a total variation diminishing (TVD) version of ... Page 4. spectral radius scalin... more ... (1992) used a total variation diminishing (TVD) version of ... Page 4. spectral radius scaling, which is routinely used in gas dynam-ics simulations, stems from the well-known relation between upwind and central differencing schemes when applied to a ... 1981) to open-channel flows ...

Research paper thumbnail of Invalidity of Preissmann Scheme for Transcritical Flow

Journal of Hydraulic Engineering-asce, 1997

Research paper thumbnail of Effect of rainfall spatial variability and sampling on salinity prediction in an estuarine system

Journal of Hydrology, 2008

Research paper thumbnail of Numerical modeling of hydrodynamics and sediment transport in lower Mississippi at a proposed delta building diversion

Journal of Hydrology, 2012

Research paper thumbnail of The use of large water and sediment diversions in the lower Mississippi River (Louisiana) for coastal restoration

Journal of Hydrology, 2010

... lower Mississippi River on the availability and accessibility of sediments, and the status of... more ... lower Mississippi River on the availability and accessibility of sediments, and the status ofsediment transport modeling and (2 ... The furthest downstream long-term (>50 y) gauging station on the Mississippi utilized to calculate both water and sediment discharge above ...

Research paper thumbnail of Effect of Local Errors of Tipping-Bucket Rain Gauges on Rainfall-Runoff Simulations

Journal of Hydrologic Engineering, 2008

Research paper thumbnail of Sensitivity of Conceptual and Physically Based Hydrologic Models to Temporal and Spatial Rainfall Sampling

Journal of Hydrologic Engineering, 2009

Research paper thumbnail of Water budget model for a remnant northern Everglades wetland

Journal of Hydraulic Research, 2010

ABSTRACT The Arthur R. Marshall Loxahatchee National Wildlife Refuge overlays Water Conservation ... more ABSTRACT The Arthur R. Marshall Loxahatchee National Wildlife Refuge overlays Water Conservation Area 1, a 580 km freshwater wetland remnant of the northern Everglades in Palm Beach County, Florida, USA. Changes in water quantity and quality have impacted the Refuge ecosystem. Ensuring appropriate management to maximize benefits for wildlife while meeting flood control and water supply needs is a refuge priority. The Simple Refuge Stage Model described herein supports these management decisions. The two-compartment model with a daily time step predicts temporal variations of water level in the refuge rim canal and interior marsh, based on observed inflows, outflows, precipitation and evapotranspiration. The model was used to evaluate various water management scenarios. The modelling approach applied herein may have utility in managing other wetland systems where over-bank flooding is a dominant mechanism, affecting hydrology and water quality.

Research paper thumbnail of Simulation of Unsteady Flow in Irrigation Canals with Dry Bed

Journal of Hydraulic Engineering, 1993

Research paper thumbnail of Surface Water Sulfate Dynamics in the Northern Florida Everglades

Journal of Environment Quality, 2009

Sulfate contamination has been identified as a serious environmental issue in the Everglades ecos... more Sulfate contamination has been identified as a serious environmental issue in the Everglades ecosystem. However, it has received less attention compared to P enrichment. Sulfate enters the Arthur R. Marshall Loxahatchee National Wildlife Refuge (Refuge), a remnant of the historic Everglades, in pumped stormwater discharges with a mean concentration of approximately 50 mg L(-1), and marsh interior concentrations at times fall below a detection limit of 0.1 mg L(-1). In this research, we developed a sulfate mass balance model to examine the response of surface water sulfate in the Refuge to changes in sulfate loading and hydrological processes. Meanwhile, sulfate removal resulting from microbial sulfate reduction in the underlying sediments of the marsh was estimated from the apparent settling coefficients incorporated in the model. The model has been calibrated and validated using long-term monitoring data (1995-2006). Statistical analysis indicated that our model is capable of capturing the spatial and temporal variations in surface water sulfate concentrations across the Refuge. This modeling work emphasizes the fact that sulfate from canal discharge is impacting even the interior portions of the Refuge, supporting work by other researchers. In addition, model simulations suggest a condition of sulfate in excess of requirement for microbial sulfate reduction in the Refuge.

Research paper thumbnail of Numerical Modeling of the Mississippi-Atchafalaya Rivers' Sediment Transport and Fate: Considerations for Diversion Scenarios

Journal of Coastal Research, 2010

Research paper thumbnail of Assessing Effects of Data Limitations on Salinity Forecasting in Barataria Basin, Louisiana, with a Bayesian Analysis

Journal of Coastal Research, 2007