-In 2010-2012, the hydrogeological model (HM) of Latvia (LAMO) was established by the scientists of Riga Technical University (RTU). In 2013-2014, LAMO was upgraded. In 2015, the recent version LAMO4 was developed. In LAMO4, the plane approximation step was decreased from 500 meters to 250 meters. The base flows of rivers for HM were adjusted by accounting for data that were provided by the measurements of river streams. LAMO is run by the commercial program Groundwater Vistas (GV), version 6. It contains the MODFOW and MODPATH programs for supporting HM and for tracking groundwater particles, respectively. By using MODPATH, the case of the Iecava river was investigated in order to find the sources that support groundwater inflow into the river (its base flow). Unforeseen results were obtained. Due to the appliance of the large regional HM, it was discovered that some part of the river base flow comes from the areas that are located very far from the river drainage basin. It also was not expected that even within the basin the particle traces were very complex. The results described in the paper serve as demonstration for the usefulness of applying a large complex HM for investigating the processes of nature.
-In 2010-2012, the hydrogeological model (HM) of Latvia (LAMO) was developed by the scientists of Riga Technical University (RTU). LAMO comprises geological and hydrogeological data provided by the Latvian Environment, Geology and Meteorology Centre (LEGMC) for the active groundwater zone of Latvia. In 2013-2015, LAMO was notably upgraded. The number of HM layers and the density of hydrographical network (rivers, lakes) were increased, cuttings of river valleys into primary geological layers were done, plane approximation step was reduced twofold, transmissivity distributions of aquifers were refined by creating variable permeability maps. In the paper, new methods are described for obtaining more reliable permeability maps by using pumping data of wells. Computer-based checking of initial data for wells was accomplished, and some drawbacks of the former maps were eliminated.
In 2010-2012, the hydrogeological model (HM) of Latvia LAMO was established by scientists of Riga Technical University. The model will be applied for management of water resources of Latvia. The commercial program Groundwater Vistas (GV) is used for running LAMO. GV includes the MODFLOW program that is worldwide applied for development of HM. Original methods were used to develop LAMO. They took part in performing the following tasks: creating geometry of HM; arrangement of various boundary conditions (digital terrain map, hydrographical network, infiltration flow, conditions on the HM shell surface); calibration process of HM. The methods have been proposed and developed by the RTU team. Because their appliance considerably improves quality of HM they may be of interest for modelers worldwide.
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