UCODE calibration for recharge/discharge rates using a digital pattern recognition procedure

Yu Feng Lin, Mary P. Anderson

Research output: Contribution to journalArticlepeer-review


A parameter estimation program, UCODE, was applied to improve a previously developed recharge/discharge pattern recognition procedure that uses a surface interpolator based on radial basis functions, a recharge/discharge mapping method, and the Pattern Recognition Utility (PRU), a GUI program utilizing image processing algorithms. The patterns (zones) are easy to generate using the PRU; the recharge/discharge rate is simply the average in the zone. By also using a parameter estimation program, the average recharge/discharge rates were significantly improved; moreover, other parameters (e.g. hydraulic conductivity) can also be estimated together with recharge/discharge rates. This paper shows the improvement of applying UCODE based on the test result from a field model.

Original languageEnglish (US)
Pages (from-to)212-218
Number of pages7
JournalIAHS-AISH Publication
Issue number277
StatePublished - 2002
Externally publishedYes


  • Graphical User Interface (GUI)
  • Groundwater recharge/discharge
  • Image processing
  • Model calibration
  • Parameter estimation

ASJC Scopus subject areas

  • Water Science and Technology
  • Oceanography


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