On a modern multi-core Windows-based microcomputer, the data inversion takes from less than a minute for small surveys with 100 electrodes in a flat area to several hours for extremely large surveys with 6000 electrodes in rugged terrain. However, the parameters which affect the inversion process can be modified by the user. The program will automatically choose the optimum inversion parameters for a particular data set. Topographic effects can be modeled by using a distorted finite-element grid such that the surface of the grid matches the topography. It supports parallel calculations that significantly reduces the inversion time. A Pentium 4 (or compatible CPU) based microcomputer with at least 512 megabytes RAM and an 80-gigabyte hard-disk is recommended. Like RES2DINV, it is completely automatic and the user does not even have to supply a starting model. The RES3DINV program uses the smoothness-constrained least-squares inversion technique to produce a 3D model of the subsurface from the apparent resistivity data alone. The arrays supported include the pole-pole, pole-dipole, inline dipole-dipole, equatorial dipole-dipole, and Wenner-Schlumberger. This program is designed to invert data collected with a rectangular grid of electrodes. In areas with complex structures, there is no substitute for a fully 3D survey. The main limitation of such surveys is probably the assumption of a 2D structure. In areas where the geological structures are approximately two-dimensional (2D), conventional 2D electrical imaging surveys have been successfully used.
#GEOTOMO RES2DINV PROFESSIONAL#
Multi-core support with RES3DINV Basic, 256 Gb RAM ort with RES3DINV Professional Supports parallel calculations on Pentium 4 (and compatible) based computers Supports up to 5041 electrodes and 67500 data points on computers with 1GB RAM Supports smooth and sharp contrast inversions Supports exact and approximate least-squares optimization methods Now available as a combined package together with RES2DINV, the 2D Resistivity & IP inversion program.
#GEOTOMO RES2DINV WINDOWS#
Comparing the data of this study with historical context and data that has been collected over at least the past century has aided in constructing such additional factors controlling water dynamics.RES3DINV software -Create 3D models of subsurface resistivity or IP! 3D surveys for pole-pole, pole-dipole, dipole-dipole, rectangular, trapezoid, Wenner, Wenner-Schlumberger, and non-conventional arrays.įor Windows XP/Vista/7/10, available for 32- and 64-bit PCs) Other factors - geologic, climactic, chemical - have their part. In other words, even the most simple hydrodynamic parameters play an important role in the phenomenon. The magnitude of intrusion seems to be a function at least of the relative difference in head and of the debit of the surface water that is in closest proximity. Analysis of geochemical and geophysical data collected during the course of this study has brought together strong evidence of river water recharge into the shallow aquifer from the Senegal River delta, and to have dimensioned the sub-surface hydraulic intrusion. Field work was performed during the months of February and March 2016, in the middle of the dry season. This included hydrochemical monitoring as well as geophysical profiling over multiple selected sites. Collection of data for this study was founded on field work. To approach the problematic, a combination of multiple monitoring methods was used in the interest of characterizing groundwater salinizationand/River water intrusion in the Senegal river delta. Irrigated agriculture is not a primary object of study, although it’s presence and impact on groundwater is closely linked and evaluated. Identifying mechanisms of groundwater freshening, and to understand the role of surface river water to this end, will be investigated in depth. The objective is to be able to characterize salinization dynamics and the related surface water-groundwater interactions. The main interest of this work is on the hydrogeological aspect of salinization of shallow aquifers in the the Senegal River delta. Evidence of cyclical marine transgressions and regressions go back to the Jurassic, and multiple transgressions have occured in the Quaternary period alone.
#GEOTOMO RES2DINV FULL#
Marine invasion and even full transgressions have been known to what is now the delta throughout geological history. Salinization in the Senegal River delta originates from marine water invasion, both past and present, into the continent. The importance of surface water from the Senegal River is elevated more by the fact that much of the groundwater accessible by shallow wells is saline. Due to low pluviometry in the delta, this river is an exceptionally important water resource for the region. The Senegal River delta is located in a semi-arid sahelian zone of West Africa.
0 kommentar(er)
