Application of the Mixing Cell Model to the quantification of groundwater – surface water interaction
English: The significance of a reliable groundwater resource assessment is of growing importance as water resources are stretched to accommodate the growing population. An essential component of a groundwater resource assessment is the quantification of surface water – groundwater interaction. The i...
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Online Access: | http://hdl.handle.net/11660/1724 |
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ftunivfreestate:oai:scholar.ufs.ac.za:11660/1724 2023-05-15T18:13:42+02:00 Application of the Mixing Cell Model to the quantification of groundwater – surface water interaction Matthews, Amy Jane Witthüser, K. T. Van Tonder, G. J. 2013-07 application/pdf http://hdl.handle.net/11660/1724 en eng University of the Free State http://hdl.handle.net/11660/1724 University of the Free State Quantification Groundwater resource assessment (GRAII) Groundwater baseflow Mixing cell model Surface water – groundwater interaction Dissertation (M.Sc. (Institute for Groundwater Studies))--University of the Free State 2013 Aquifers Dissertation 2013 ftunivfreestate 2022-07-09T06:08:34Z English: The significance of a reliable groundwater resource assessment is of growing importance as water resources are stretched to accommodate the growing population. An essential component of a groundwater resource assessment is the quantification of surface water – groundwater interaction. The insufficient amount of data in South Africa and the apparent lack of accuracy of current estimates of the groundwater component of baseflow lead to the investigation of a new methodology. The applicability of the Mixing Cell Model (MCM) to quantify the groundwater contribution to baseflow is examined to determine whether the method would be of use in groundwater resource assessments. The MCM simultaneously solves water and solute mass balances to determine unknown inflows to a system, in this application the groundwater component of baseflow. The incorporation of water quality data into the estimation of the surface water – groundwater interaction increases the use of available data, and thus has the ability to decrease the uncertainty of the estimation process. The balance equations are equated to an error term which is used in the quadratic programming solution of minimizing the square error sums in order to determine the unknown inflows. The mixing cell model is applied to datasets from the surface water – groundwater interaction test site developed by the University of the Free State, in addition to data collected along the middle Modder River during a fieldwork survey. The MCM is subsequently applied to a set of quaternary catchments in the Limpopo Province for which there are available calibrated estimates of the groundwater component of baseflow for the Sami and Hughes models. The MCM is further applied to the quaternary catchment D73F, located in the semi-arid Northern Cape, to assess the applicability of the mathematically based MCM in terms of a flow system located within a regionally-defined zero groundwater baseflow zone. The MCM results for each study area are assessed in comparison to groundwater baseflow ... Doctoral or Postdoctoral Thesis sami KovsieScholar Repository (University of the Free State - UFS UV) |
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Open Polar |
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KovsieScholar Repository (University of the Free State - UFS UV) |
op_collection_id |
ftunivfreestate |
language |
English |
topic |
Quantification Groundwater resource assessment (GRAII) Groundwater baseflow Mixing cell model Surface water – groundwater interaction Dissertation (M.Sc. (Institute for Groundwater Studies))--University of the Free State 2013 Aquifers |
spellingShingle |
Quantification Groundwater resource assessment (GRAII) Groundwater baseflow Mixing cell model Surface water – groundwater interaction Dissertation (M.Sc. (Institute for Groundwater Studies))--University of the Free State 2013 Aquifers Matthews, Amy Jane Application of the Mixing Cell Model to the quantification of groundwater – surface water interaction |
topic_facet |
Quantification Groundwater resource assessment (GRAII) Groundwater baseflow Mixing cell model Surface water – groundwater interaction Dissertation (M.Sc. (Institute for Groundwater Studies))--University of the Free State 2013 Aquifers |
description |
English: The significance of a reliable groundwater resource assessment is of growing importance as water resources are stretched to accommodate the growing population. An essential component of a groundwater resource assessment is the quantification of surface water – groundwater interaction. The insufficient amount of data in South Africa and the apparent lack of accuracy of current estimates of the groundwater component of baseflow lead to the investigation of a new methodology. The applicability of the Mixing Cell Model (MCM) to quantify the groundwater contribution to baseflow is examined to determine whether the method would be of use in groundwater resource assessments. The MCM simultaneously solves water and solute mass balances to determine unknown inflows to a system, in this application the groundwater component of baseflow. The incorporation of water quality data into the estimation of the surface water – groundwater interaction increases the use of available data, and thus has the ability to decrease the uncertainty of the estimation process. The balance equations are equated to an error term which is used in the quadratic programming solution of minimizing the square error sums in order to determine the unknown inflows. The mixing cell model is applied to datasets from the surface water – groundwater interaction test site developed by the University of the Free State, in addition to data collected along the middle Modder River during a fieldwork survey. The MCM is subsequently applied to a set of quaternary catchments in the Limpopo Province for which there are available calibrated estimates of the groundwater component of baseflow for the Sami and Hughes models. The MCM is further applied to the quaternary catchment D73F, located in the semi-arid Northern Cape, to assess the applicability of the mathematically based MCM in terms of a flow system located within a regionally-defined zero groundwater baseflow zone. The MCM results for each study area are assessed in comparison to groundwater baseflow ... |
author2 |
Witthüser, K. T. Van Tonder, G. J. |
format |
Doctoral or Postdoctoral Thesis |
author |
Matthews, Amy Jane |
author_facet |
Matthews, Amy Jane |
author_sort |
Matthews, Amy Jane |
title |
Application of the Mixing Cell Model to the quantification of groundwater – surface water interaction |
title_short |
Application of the Mixing Cell Model to the quantification of groundwater – surface water interaction |
title_full |
Application of the Mixing Cell Model to the quantification of groundwater – surface water interaction |
title_fullStr |
Application of the Mixing Cell Model to the quantification of groundwater – surface water interaction |
title_full_unstemmed |
Application of the Mixing Cell Model to the quantification of groundwater – surface water interaction |
title_sort |
application of the mixing cell model to the quantification of groundwater – surface water interaction |
publisher |
University of the Free State |
publishDate |
2013 |
url |
http://hdl.handle.net/11660/1724 |
genre |
sami |
genre_facet |
sami |
op_relation |
http://hdl.handle.net/11660/1724 |
op_rights |
University of the Free State |
_version_ |
1766186316864684032 |