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DEPRESSION CONE MIS-SHAPENNING DUE TO VARIABLE PERMEABILITY OF A DOLOMITE EXCAVATION AQUIFER IN LATVIA

Aivars Spalviņš, Kaspars Krauklis, Irīna Eglīte, Inta Lāce

First published: 2021-12-20https://doi.org/10.5593/sgem2021/3.1/s12.10View metrics

Abstract

If the place hydrogeological conditions are uniform (invariable aquifer transmissivity, no impact of hydrogeological network) then the quarry depression cone and the pumping rate for the quarry draining can be obtained by using analytical methods. The dolomite aquifer at the Iecava district in Latvia included large impervious areas. Due to this fact, appliance of analytical methods cannot give the right depression cone. The local hydrogeological model (HM) was applied for obtaining the depression cone of the dolomite excavation quarry. The Groundwater Vistas (GV) system was used for running HM. For obtaining the depression cone, the original method was applied. To carry out the method, the fixed head boundary conditions on the HM area borderline were changed to the zero value. The only non-zero boundary condition for obtaining the depression cone was the quarry drawdown. It was found out that because of the dolomite aquifer irregular permeability, the cone depression isoline contours, including the borderline, were considerably deformed in comparison with the circles for the related uniform aquifer. The quarry drainage flow was considerably smaller than the one for the uniform aquifer. The results reported in the paper may be useful for specialists dealing with obtaining of depression cones for heterogeneous aquifers.

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Publication details

Title
DEPRESSION CONE MIS-SHAPENNING DUE TO VARIABLE PERMEABILITY OF A DOLOMITE EXCAVATION AQUIFER IN LATVIA
Authors
Aivars Spalviņš, Kaspars Krauklis, Irīna Eglīte, Inta Lāce
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Water Resources. Forest, Marine and Ocean Ecosystems
Publisher
STEF92 Technology
Year
2021
Pages
67-74
SWS Citekey
Spalvins2021127582
ISSN
1314-2704
ISBN
978-619-7603-24-8
Language
en
Publication type
Conference Paper
Keywords
draining of mineral excavation quarriesobtaining of depression conehydrogeological model
References7

  1. Environmental Simulations, Inc. Groundwater Vistas. Version 7, Guide to using, 2017

  2. Harbaugh W., MODFLOW-2005, U.S. Geological Survey Modular Ground-Water Model: the ground-water flow process, chap 16, book 6, US Geological Survey Techniques and Methods 6-A16, USGS, Reston, VA

  3. Golden Software, Inc., SURFER-13 for Windows, Users manual, Guide to Using, 2015

  4. The topographical map prepared by Latvian geospatial information agency, the scale of 1:50000

  5. The materials provided by customer (in Latvian)

  6. A. Spalvins, Hydrogeological modelling of depression cones for the dolomite excavation quarries Ailes and Jaunbemberi at Iecava district. Contract report of Riga Technical university, Riga, 2020, 16 p., (in Latvian)

  7. J. Blar, Hydraulics of groundwater, Mc.Graw-Hill Inc., 1979, 567 p.

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