Estimation of heterogeneous aquifer parameters from piezometric data using ridge functions and neural networks |
| |
Authors: | Email author" target="_blank">A?MantoglouEmail author |
| |
Institution: | (1) Department of Rural and Surveying Engineering, National Technical University of Athens, GR-15780 Athens, Greece |
| |
Abstract: | Inverse modeling aims to estimate transmissivity and other parameters needed by distributed aquifer models, using piezometric measurements. While these parameters are highly variable in space, the two-dimensional aquifer area is essentially empty of measurements ( curse of dimensionality ). To address this problem, a representation of the two-dimensional transmissivity map based on ridge functions and neural networks is introduced and applied to inverse aquifer modeling. The proposed representation has good expressive power, i.e. it is concise and convergences quickly as the number of parameters are increased, and it is expected to express complex transmissivity variations with relatively few parameters which can be estimated from the piezometric measurements. A simple regularization that can dampen erratic high frequency terms in the estimated parameters is suggested. Several examples indicate that the proposed parameterization can handle diverse types of transmissivity variations while it is particularly suited when the true transmissivity map exhibits specific sorts of heterogeneity with large anisotropies or abrupt changes along lines. |
| |
Keywords: | Aquifer modelling Model calibration Inverse modelling Neural networks |
本文献已被 SpringerLink 等数据库收录! |