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

H. Ajami, J.P. Evans, M.F. McCabe, S. Stisen

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

15 Citationer (Scopus)

Abstrakt

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.

OriginalsprogEngelsk
Sider (fra-til)5169-5179
Antal sider11
TidsskriftHydrology and Earth System Sciences
Vol/bind18
Udgave nummer12
DOI
StatusUdgivet - 12 dec. 2014

Programområde

  • Programområde 2: Vandressourcer

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