Accession Number:

ADA455236

Title:

Potential Improvements for HEC-HMS Automated Parameter Estimation

Descriptive Note:

Final rept.

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB

Personal Author(s):

• Skahill, Brian E.

Report Date:

2006-08-01

Pagination or Media Count:

59.0

Abstract:

Model independent enhancements and adaptations to the Gauss-Marquardt-Levenberg GML method of computer-based parameter estimation are described and demonstrated as potential improvements to existing HEC-HMS automatic calibration capabilities. In contrast to existing HEC-HMS automated parameter estimation capabilities, these methods support global optimization, the ability to simultaneously calibrate multiple subwatershed systems represented within an HEC-HMS model, and they also provide information about individual parameter sensitivities and parameter correlation during and at the end of the calibration process. Moreover, their model independent nature allows one to include into the calibration process 1 state information other than simply stream discharge data, 2 multiple periods, rather than a single time window, of the calibration datasets, and 3 the ability to weight data in order to accommodate a prediction specific calibration effort or to accommodate suspect andor missing observations. The methods are demonstrated by calibrating HEC-HMS models to subwatershed systems in the Goodwin Creek Experimental Watershed.

Descriptors:

• *AUTOMATION
• *COMPUTER APPLICATIONS
• *CALIBRATION
• TIME INTERVALS
• EXPERIMENTAL DATA
• WATERSHEDS
• STREAMS
• PARAMETERS
• OBSERVATION
• MODELS
• OPTIMIZATION

Subject Categories:

• Hydrology, Limnology and Potamology
• Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE