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    New Methodology for Optimization of Freshwater Inflows to Estuaries

    Source: Journal of Water Resources Planning and Management:;1994:;Volume ( 120 ):;issue: 002
    Author:
    Yixing Bao
    ,
    Larry W. Mays
    DOI: 10.1061/(ASCE)0733-9496(1994)120:2(199)
    Publisher: American Society of Civil Engineers
    Abstract: The objective of this work is to develop a general methodology for determination of the optimal freshwater inflows into bays and estuaries to balance freshwater demands with the harvest of various types of estuarine resources. The methodology is based upon solving a large‐scale nonlinear programming problem formulated in an optimal‐control framework. Constraints of the optimization problem include regression equations for harvest of the various species that express fishery harvest as a function of the quantity of freshwater inflow. The stochastic element of the problem (i.e. the uncertainty associated with the regression equations for harvest) is considered by expressing constraints in a chance‐constrained formulation. A nonlinear programming optimizer is interfaced with a hydrodynamic transport model to implicitly solve the hydrodynamic‐salinity constraint equations for salinity levels. An augmented Lagrangian method is introduced to incorporate the salinity constraints into the objective so that the problem size for the optimizer is significantly reduced. A computer model OPTFLOW has been developed by interfacing a simulator for the hydrodynamic‐salinity (HYD‐SAL) with a nonlinear optimizer (GRG2) to apply the methodology by the present writers in an accompanying companion paper. An efficient approximation scheme is developed for evaluation of the objective function and its reduced gradient to reduce the computational effort dramatically. The new methodology can provide a very useful tool for decision makers to quantitatively analyze various water‐management strategies.
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      New Methodology for Optimization of Freshwater Inflows to Estuaries

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    http://yetl.yabesh.ir/yetl1/handle/yetl/39258
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    contributor authorYixing Bao
    contributor authorLarry W. Mays
    date accessioned2017-05-08T21:07:00Z
    date available2017-05-08T21:07:00Z
    date copyrightMarch 1994
    date issued1994
    identifier other%28asce%290733-9496%281994%29120%3A2%28199%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/39258
    description abstractThe objective of this work is to develop a general methodology for determination of the optimal freshwater inflows into bays and estuaries to balance freshwater demands with the harvest of various types of estuarine resources. The methodology is based upon solving a large‐scale nonlinear programming problem formulated in an optimal‐control framework. Constraints of the optimization problem include regression equations for harvest of the various species that express fishery harvest as a function of the quantity of freshwater inflow. The stochastic element of the problem (i.e. the uncertainty associated with the regression equations for harvest) is considered by expressing constraints in a chance‐constrained formulation. A nonlinear programming optimizer is interfaced with a hydrodynamic transport model to implicitly solve the hydrodynamic‐salinity constraint equations for salinity levels. An augmented Lagrangian method is introduced to incorporate the salinity constraints into the objective so that the problem size for the optimizer is significantly reduced. A computer model OPTFLOW has been developed by interfacing a simulator for the hydrodynamic‐salinity (HYD‐SAL) with a nonlinear optimizer (GRG2) to apply the methodology by the present writers in an accompanying companion paper. An efficient approximation scheme is developed for evaluation of the objective function and its reduced gradient to reduce the computational effort dramatically. The new methodology can provide a very useful tool for decision makers to quantitatively analyze various water‐management strategies.
    publisherAmerican Society of Civil Engineers
    titleNew Methodology for Optimization of Freshwater Inflows to Estuaries
    typeJournal Paper
    journal volume120
    journal issue2
    journal titleJournal of Water Resources Planning and Management
    identifier doi10.1061/(ASCE)0733-9496(1994)120:2(199)
    treeJournal of Water Resources Planning and Management:;1994:;Volume ( 120 ):;issue: 002
    contenttypeFulltext
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