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A Practical Guide to Calibration of a GSSHA Hydrologic Model Using ERDC Automated Model Calibration Software - Efficient Local Search
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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The objective of this technical note is to demonstrate, by way of examples, how to use the Engineer Research and Development Center ERDC implementation of the Levenberg-Marquardt LM and Secant LM SLM method for model independent parameter estimation to calibrate a Gridded Surface Subsurface Hydrologic Analysis GSSHA hydrologic model. The purpose is not to present or focus on the theory which underlies the parameter estimation methods, but rather to carefully describe how to use the ERDC software implementation of the secant LM method that accommodates the PEST model independent interface to calibrate a GSSHA hydrologic model. We will consider variations of our Secant LM SLM implementation in attempts to provide the interested reader with an intuitive sense of how the method works. We will also demonstrate how our LMSLM implementation compares with its counterparts as implemented in the popular PEST software.
APPROVED FOR PUBLIC RELEASE