| Abstract: | Parameters in numerical ground-water flow models have been successfully estimated using nonlinear-optimization methods such as the modified Gauss-Newton (GN) method and conjugate-direction methods. This paper investigates the relative efficiency of GN and three conjugate-direction parameter-estimation methods on two-dimensional, steady-state and transient ground-water flow test cases. The steady-state test cases are included to compare the performance of the algorithm with published examples. The three conjugate-direction methods are the Fletcher-Reeves (FR) and quasi-Newton (QN) regression methods, and combination Fletcher-Reeves quasi-Newton (FR-QN). All three are combined with Newton‘s method of calculating step size. The numerical ground-water flow model is described by McDonald and Harbaugh. |
| Genre: | Conference Paper |
| ProdID: | 70015892 |
| Citation Author: | Hill, M. C. |
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| Citation Editor: | Gambolati G.Rinaldo A.Brebbia C.A.Gray W.G.Pinder G.F. |
| Citation End Page: | 108 |
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| Citation Language: | English |
| Citation Larger Work Title: | Computational Methods in Subsurface Hydrology |
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| Citation Number Of Pages: | 6 |
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| Citation Publisher: | Publ by Springer-Verlag Berlin |
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| Citation Search Results Text: | Relative efficiency of four parameter-estimation methods in steady-state and transient ground-water flow models; 1990; Conference Paper; Computational Methods in Subsurface Hydrology; Hill, M. C. |
| Citation Start Page: | 103 |
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| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Relative efficiency of four parameter-estimation methods in steady-state and transient ground-water flow models; 1990; Conference Paper; Computational Methods in Subsurface Hydrology; Hill, M. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
| Publisher: | Publ by Springer-Verlag Berlin |
