The Experts below are selected from a list of 78 Experts worldwide ranked by ideXlab platform

Chris Houser - One of the best experts on this subject based on the ideXlab platform.

  • Sediment resuspension by vessel-generated waves along the Savannah River, Georgia
    Journal of Waterway Port Coastal and Ocean Engineering, 2011
    Co-Authors: Chris Houser
    Abstract:

    Vessel-generated waves have the potential to erode the shoreline where there is regular commercial and recreational boat traffic in otherwise low-energy estuarine and fetch-limited environments. Whereas it is well established that vessel-generated waves are capable of resuspending significant quantities of bottom and bank sediment, there are limited field data showing how and when sediment is resuspended by the wake and the direction of net transport. This paper presents the results of an instrumented field study to measure sediment resuspension and transport in response to wakes generated by supercritical Pilot Boats and subcritical container ships at the mouth of the Savannah River in Georgia. Suspended sediment concentrations increase with the turbulent kinetic energy of the supercritical Pilot-boat wake. The amount of sediment resuspended dependent on the available supply of sediment on the upper-foreshore. Whereas sediment is transported landward by the individual waves of the group, net transport is offshore in response to a low-frequency oscillation similar to a second-order group-forced current. In some cases, the direction of net transport is reinforced or reversed depending on the timing of the Pilot-boat wake with the seiche forced by a passing container ship. In contrast to the Pilot Boats, sediment transport by subcritical container ships tends to be landward, but can also be weakly offshore depending on the timing of the wave group with the low-frequency drawdown and surge.

  • Relative Importance of Vessel-Generated and Wind Waves to Salt Marsh Erosion in a Restricted Fetch Environment
    Journal of Coastal Research, 2010
    Co-Authors: Chris Houser
    Abstract:

    HOUSER, C., 2010. Relative importance of vessel-generated and wind waves to salt marsh erosion in a restricted fetch environment. Journal of Coastal Research, 26(2), 230–240. West Palm Beach (Florida), ISSN 0749-0208. Erosion of a salt marsh at Fort Pulaski National Monument threatens a pier of historical significance along the North Channel of the Savannah River, the main shipping channel for the Port of Savannah, Georgia. The erosion was initiated by the alongshore and onshore migration of a supratidal oyster shell ridge that exposed a marsh scarp that is susceptible to lateral retreat in response to both wind-generated and vessel-generated waves undercutting the upper-marsh surface. An instrumented field study was completed between October 2007 and February 2008 to examine the relative importance of wind-generated and vessel-generated waves to the retreat of the scarp by 0.21 m along the instrumented transect. On average, there were 14 sailings by container ships per day and up to twice as many sailings by Pilot Boats ferrying the harbor Pilots to container ships offshore, but only those vessels that sailed within 1 m of the high-tide water level had waves capable of reaching the scarp. The vessel-generated waves accounted for 5% of the cumulative wave energy over the study, but because of their larger height and longer period, they accounted for almost 25% of the cumulative wave force. It is the locally generated wind waves that account for most of the wave force acting on the exposed scarp and which are largely responsible for the observed retreat. Waves generated during both frontal and tropical storms tend to be associated with storm tides that maintain water levels at or near the elevation of the scarp for several days. Now that the shell ridge has largely migrated past the site and the areas of greater retreat historically are protected by a wedge of sand, it is argued that an increase in vessel traffic and/or the use of larger, post-Panamax ships will not significantly accelerate the retreat of the marsh.

  • Relative Importance of Vessel-Generated and Wind Waves to Salt Marsh Erosion in a Restricted Fetch Environment
    Journal of Coastal Research, 2010
    Co-Authors: Chris Houser
    Abstract:

    Erosion of a salt marsh at Fort Pulaski National Monument threatens a pier of historical significance along the North Channel of the Savannah River, the main shipping channel for the Port of Savannah, Georgia. The erosion was initiated by the alongshore and onshore migration of a supratidal oyster shell ridge that exposed a marsh scarp that is susceptible to lateral retreat in response to both wind-generated and vessel-generated waves undercutting the upper-marsh surface. An instrumented field study was completed between October 2007 and February 2008 to examine the relative importance of wind-generated and vessel-generated waves to the retreat of the scarp by 0.21 m along the instrumented transect. On average, there were 14 sailings by container ships per day and up to twice as many sailings by Pilot Boats ferrying the harbor Pilots to container ships offshore, but only those vessels that sailed within 1 m of the high-tide water level had waves capable of reaching the scarp. The vessel-generated waves accounted for ∼5 of the cumulative wave energy over the study, but because of their larger height and longer period, they accounted for almost 25% of the cumulative wave force. It is the locally generated wind waves that account for most of the wave force acting on the exposed scarp and which are largely responsible for the observed retreat. Waves generated during both frontal and tropical storms tend to be associated with storm tides that maintain water levels at or near the elevation of the scarp for several days. Now that the shell ridge has largely migrated past the site and the areas of greater retreat historically are protected by a wedge of sand, it is argued that an increase in vessel traffic and/or the use of larger, post-Panamax ships will not significantly accelerate the retreat of the marsh. © 2010 Coastal Education and Research Foundation

J.n. Saraji - One of the best experts on this subject based on the ideXlab platform.

  • "EVALUATION OF MUSCULOSKELETAL DISORDERS RISK FACTORS AMONG THE CREW OF THE IRANIAN PORTS AND SHIPPING ORGANIZATION’S VESSELS"
    Acta medica Iranica, 2004
    Co-Authors: J.n. Saraji, M. A. Hassanzadeh, M. Pourmahabadian S. J. Shahtaheri
    Abstract:

    Musculoskeletal disorders (MSDs) are important causes of work incapacity and loss of work days. MSDs are major problems in almost all countries and increasingly can be found in service industries such as maritime sector. This study aimed at evaluation of MSDs symptoms among crew of tugBoats, dredgers, Pilot Boats and barges by using Nordic Musculoskeletal Questionnaire (NMQ) and also determination of work-related MSDs risk factors by application of Ovako Working Analysis Posture System (OWAS). The result showed that 28.4% of body postures rated in action category 3 and 4 of OWAS. It seems that OWAS cannot be used as a determination method of risk factors for all jobs. Also, the best and sometimes the only way to correct awkward postures is correction of worker's back position.

  • Archive of SID EVALUATION OF MUSCULOSKELETAL DISORDERS RISK FACTORS AMONG THE CREW OF THE IRANIAN PORTS AND SHIPPING ORGANIZATION'S VESSELS
    2004
    Co-Authors: J.n. Saraji, M. A. Hassanzadeh, M. Pourmahabadian, S. J. Shahtaheri
    Abstract:

    Musculoskeletal disorders (MSDs) are important causes of work incapacity and loss of work days. MSDs are major problems in almost all countries and increasingly can be found in service industries such as maritime sector. This study aimed at evaluation of MSDs symptoms among crew of tugBoats, dredgers, Pilot Boats and barges by using Nordic Musculoskeletal Questionnaire (NMQ) and also determination of work-related MSDs risk factors by application of Ovako Working Analysis Posture System (OWAS). The result showed that 28.4% of body postures rated in action category 3 and 4 of OWAS. It seems that OWAS cannot be used as a determination method of risk factors for all jobs. Also, the best and sometimes the only way to correct awkward postures is correction of worker's back position. Acta Medica Iranica, 42(5): 350-354; 2004

M. Pourmahabadian S. J. Shahtaheri - One of the best experts on this subject based on the ideXlab platform.

  • "EVALUATION OF MUSCULOSKELETAL DISORDERS RISK FACTORS AMONG THE CREW OF THE IRANIAN PORTS AND SHIPPING ORGANIZATION’S VESSELS"
    Acta medica Iranica, 2004
    Co-Authors: J.n. Saraji, M. A. Hassanzadeh, M. Pourmahabadian S. J. Shahtaheri
    Abstract:

    Musculoskeletal disorders (MSDs) are important causes of work incapacity and loss of work days. MSDs are major problems in almost all countries and increasingly can be found in service industries such as maritime sector. This study aimed at evaluation of MSDs symptoms among crew of tugBoats, dredgers, Pilot Boats and barges by using Nordic Musculoskeletal Questionnaire (NMQ) and also determination of work-related MSDs risk factors by application of Ovako Working Analysis Posture System (OWAS). The result showed that 28.4% of body postures rated in action category 3 and 4 of OWAS. It seems that OWAS cannot be used as a determination method of risk factors for all jobs. Also, the best and sometimes the only way to correct awkward postures is correction of worker's back position.

S. J. Shahtaheri - One of the best experts on this subject based on the ideXlab platform.

  • Archive of SID EVALUATION OF MUSCULOSKELETAL DISORDERS RISK FACTORS AMONG THE CREW OF THE IRANIAN PORTS AND SHIPPING ORGANIZATION'S VESSELS
    2004
    Co-Authors: J.n. Saraji, M. A. Hassanzadeh, M. Pourmahabadian, S. J. Shahtaheri
    Abstract:

    Musculoskeletal disorders (MSDs) are important causes of work incapacity and loss of work days. MSDs are major problems in almost all countries and increasingly can be found in service industries such as maritime sector. This study aimed at evaluation of MSDs symptoms among crew of tugBoats, dredgers, Pilot Boats and barges by using Nordic Musculoskeletal Questionnaire (NMQ) and also determination of work-related MSDs risk factors by application of Ovako Working Analysis Posture System (OWAS). The result showed that 28.4% of body postures rated in action category 3 and 4 of OWAS. It seems that OWAS cannot be used as a determination method of risk factors for all jobs. Also, the best and sometimes the only way to correct awkward postures is correction of worker's back position. Acta Medica Iranica, 42(5): 350-354; 2004

M. A. Hassanzadeh - One of the best experts on this subject based on the ideXlab platform.

  • "EVALUATION OF MUSCULOSKELETAL DISORDERS RISK FACTORS AMONG THE CREW OF THE IRANIAN PORTS AND SHIPPING ORGANIZATION’S VESSELS"
    Acta medica Iranica, 2004
    Co-Authors: J.n. Saraji, M. A. Hassanzadeh, M. Pourmahabadian S. J. Shahtaheri
    Abstract:

    Musculoskeletal disorders (MSDs) are important causes of work incapacity and loss of work days. MSDs are major problems in almost all countries and increasingly can be found in service industries such as maritime sector. This study aimed at evaluation of MSDs symptoms among crew of tugBoats, dredgers, Pilot Boats and barges by using Nordic Musculoskeletal Questionnaire (NMQ) and also determination of work-related MSDs risk factors by application of Ovako Working Analysis Posture System (OWAS). The result showed that 28.4% of body postures rated in action category 3 and 4 of OWAS. It seems that OWAS cannot be used as a determination method of risk factors for all jobs. Also, the best and sometimes the only way to correct awkward postures is correction of worker's back position.

  • Archive of SID EVALUATION OF MUSCULOSKELETAL DISORDERS RISK FACTORS AMONG THE CREW OF THE IRANIAN PORTS AND SHIPPING ORGANIZATION'S VESSELS
    2004
    Co-Authors: J.n. Saraji, M. A. Hassanzadeh, M. Pourmahabadian, S. J. Shahtaheri
    Abstract:

    Musculoskeletal disorders (MSDs) are important causes of work incapacity and loss of work days. MSDs are major problems in almost all countries and increasingly can be found in service industries such as maritime sector. This study aimed at evaluation of MSDs symptoms among crew of tugBoats, dredgers, Pilot Boats and barges by using Nordic Musculoskeletal Questionnaire (NMQ) and also determination of work-related MSDs risk factors by application of Ovako Working Analysis Posture System (OWAS). The result showed that 28.4% of body postures rated in action category 3 and 4 of OWAS. It seems that OWAS cannot be used as a determination method of risk factors for all jobs. Also, the best and sometimes the only way to correct awkward postures is correction of worker's back position. Acta Medica Iranica, 42(5): 350-354; 2004