#Nonlinear inversion res2dinv software#

Hence, human-induced activities should be restricted in the present study area on the landward side to reduce the hazards related to seawater invasion in the groundwater aquifers in the region.

#Nonlinear inversion res2dinv software#

This is mainly because the anthropogenic activities have overshadow geogenic activities. Thesis inversion parameters The following list shows the inversion parameters chosen for the software used in this study. Moreover, the geophysical data suggests that the seawater invasion zones do not show any linear relationship throughout the area. The inverted resistivity model at site 1 is shown in Figure 2. As a second step, we added the topographic information, using the RES2DINV Loke 2012 inversion software. These affected zones are associated mostly with clay and sandy layers up to a depth of 30В m. Before inversion, all of the apparent resistivity data were checked for quality, and suspected outliers were re-moved from the datasets. Subsequently, the IP data with low chargeability indicates probable zones of seawater invasion. Furthermore, the resistivity imaging survey showed low resistive zones (0вЂ“5 О©m) in shallow aquifers. The finite element method based inversion technique adopted in this study is better in terms of the final resolution of interpretation. Smoothness-constrained least square and unstructured grid-based finite element methods were applied to interpret ERI data. In this study, inversion of apparent resistivity is developed by adopting the FORTRAN GA inversion codes of Hamimu et al., 8, 9 which were used for inverting surface wave phase velocity curves. In the present work, geophysical investigations such as Electrical Resistivity Imaging (ERI) and Induced Polarization (IP) data were used to delineate the possible zones of shallow aquifers contaminated with seawater. 8 The resistivity data were inverted with RES2DINV Loke, 2002. Inversion Using the GA Optimization Technique. This is correctly reflected in the stable inversion theory, but the classical inversion theory insists that the inverse system should also be causal. The Digha-Shankarur-Tajpur-Mandarmani (DSTM) area in West-Bengal is well known for seawater invasion in shallow aquifers. Stable inversion of nonlinear non-minimum phase systems 83 inverse system, which maps a given output to an input, is not a physical system and does not have to be causal.