Sensitivity analysis of AIRDOS-EPA using ADGEN with matrix reduction algorithms
ADGEN was developed to automate the calculation of sensitivities of a new model results to all input data in existing FORTRAN 77 computer models. ADGEN is now included as one of two options available to users of the Gradient Enhanced Software System (GRESS). GRESS was initially developed to automate the calculation of sensitivities of all model results to a few input parameters by application of the calculus chain rule during the forward run of the computer model. The ADGEN option automates the application of adjoint sensitivity theory to calculate first derivatives of model results to input data by first creating, and then solving, an adjoint equation for the computer model. The purpose of this report is twofold: to present the development of two algorithms that significantly improve the application of ADGEN; and, to demonstrate the application of ADGEN to the AIRDOS-EPA computer model. 18 refs., 8 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5345310
- Report Number(s):
- ORNL/TM-11373; ON: DE90004373
- Country of Publication:
- United States
- Language:
- English
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