Journal ArticleDOI
Scheduling Maintenance Dredging on Single Reach with Uncertainty
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In this article, economic and reliability analysis is proposed for scheduling advance maintenance dredging on isolated reaches of navigation channels based on economic and reliable analysis, where sedimentation occurs regularly as a result of gradual slumping, quiescent deposition, or regular erosion due to waves and wakes.Abstract:
New methods are suggested for scheduling advance maintenance dredging on isolated reaches of navigation channels based on economic and reliability analysis. For reaches where sedimentation occurs regularly as a result of gradual slumping, quiescent deposition, or regular erosion due to waves and wakes, the problem reduces to a deterministic least-cost replacement problem. Where sedimentation rates are uncertain, the risk of sediment encroachment into the navigational channel becomes a concern. Where sedimentation rates are probabilistic and independently distributed in time, encroachment probabilities and expected dredging costs can be calculated for a variety of dredging schedules. This risk and cost analysis allows explicit specification of risk-cost trade-offs in dredge scheduling. These methods are applied to an example case where existing dredging costs are compared with those estimated using these new dredge scheduling techniques. Extensions of these methods could be applied to multiple-reach dredge scheduling, sizing sediment traps, and scheduling dredging with explicit consideration of environmental impacts.read more
Citations
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Journal ArticleDOI
Analysis of a parallel machine scheduling problem with sequence dependent setup times and job availability intervals
TL;DR: The initial investigations show that the pure CP model is very efficient in obtaining good quality feasible solutions but, fails to report the optimal solution for the majority of the problem instances, while the two logic-based Benders decomposition algorithms are able to obtain near optimal solutions.
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Maintenance scheduling : description, status and future directions
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A sensitivity analysis of an optimal Gantt charting maintenance scheduling model
TL;DR: In this article, an analytical approach to test sensitivity of a maintenance scheduling model is presented, which is used as input into the Gantt charting model employed in the traditional production scheduling system.
Journal ArticleDOI
Waterway maintenance budget allocation in a multimodal network
Ahmadreza Mahmoudzadeh,Mohammadadel Khodakarami,Chaolun Ma,Kenneth Ned Mitchell,Xiubin Bruce Wang,Yunlong Zhang +5 more
TL;DR: This study proposes a multimodal approach to formulate the waterway maintenance problem in a network that considers rivers, locks/dams, highways and railways and explicit modeling of the interdependency between projects in realizing the system benefits as well as the random shoaling effect.
Journal ArticleDOI
Risk-Based Spatial Decision Support System for Maintenance Dredging of Navigation Channels
TL;DR: In this article, the authors present a risk-based spatial decision support system intended to aid in the planning of maintenance dredging activities for navigation channels, which explains the trade-offs in project costs and channel reliability for annual budgeting and dredge scheduling.
References
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Journal ArticleDOI
Optimal replacement policy
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Journal ArticleDOI
Optimal Replacement Policy
Journal ArticleDOI
Sedimentation of dredged channels by currents and waves
TL;DR: In this article, a detailed mathematical model for sedimentation of dredged channels, based on a detailed representation of all relevant transport processes such as convection, mixing and settling, is presented.
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