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    Technical Note: Reducing the spin-up time of integrated surface water–groundwater models

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    Type
    Article
    Authors
    Ajami, H.
    Evans, J. P. cc
    McCabe, Matthew cc
    Stisen, S.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Earth System Observation and Modelling
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2014-12-12
    Permanent link to this record
    http://hdl.handle.net/10754/346781
    
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    Abstract
    One of the main challenges in the application of coupled or integrated hydrologic models is specifying a catchment's initial conditions in terms of soil moisture and depth-to-water table (DTWT) distributions. One approach to reducing uncertainty in model initialization is to run the model recursively using either a single year or multiple years of forcing data until the system equilibrates with respect to state and diagnostic variables. However, such "spin-up" approaches often require many years of simulations, making them computationally intensive. In this study, a new hybrid approach was developed to reduce the computational burden of the spin-up procedure by using a combination of model simulations and an empirical DTWT function. The methodology is examined across two distinct catchments located in a temperate region of Denmark and a semi-arid region of Australia. Our results illustrate that the hybrid approach reduced the spin-up period required for an integrated groundwater–surface water–land surface model (ParFlow.CLM) by up to 50%. To generalize results to different climate and catchment conditions, we outline a methodology that is applicable to other coupled or integrated modeling frameworks when initialization from an equilibrium state is required.
    Citation
    Technical Note: Reducing the spin-up time of integrated surface water–groundwater models 2014, 18 (12):5169 Hydrology and Earth System Sciences
    Publisher
    Copernicus GmbH
    Journal
    Hydrology and Earth System Sciences
    DOI
    10.5194/hess-18-5169-2014
    Additional Links
    http://www.hydrol-earth-syst-sci.net/18/5169/2014/
    ae974a485f413a2113503eed53cd6c53
    10.5194/hess-18-5169-2014
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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