Jānis Bikše

Jānis Bikše
University of Latvia | LU · Department of Geology

Master of Geology

About

52
Publications
5,033
Reads
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78
Citations
Citations since 2016
42 Research Items
76 Citations
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2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
Introduction
Jānis Bikše currently works at the Department of Geology, University of Latvia. Jānis does research in Hydrogeology, Geology and Geochemistry.
Additional affiliations
June 2018 - present
University of Latvia
Position
  • Researcher
April 2018 - present
University of Latvia
Position
  • Project Manager
Description
  • The Administration of Latvian Environmental Protection Fund project "Development of baseline levels and thresholds for Latvian groundwater bodies"
January 2018 - present
University of Latvia
Position
  • Project Manager
Description
  • University of Latvia Foundation fund project: "First wireless network development for low energy consumption, wide area sensors"

Publications

Publications (52)
Article
Full-text available
Multivariate statistical methods – principal component analysis (PCA) and hierarchical cluster analysis (HCA) – are applied to identify geochemically distinct groundwater groups in the territory of Latvia. The main processes observed to be responsible for groundwater chemical composition are carbonate and gypsum dissolution, fresh and saltwater mix...
Article
Full-text available
There are thousands of areas in Latvia where groundwater flow out at the surface in type of springs, therefore people actively consume spring water. At the moment there is a lack of information about spring water quality that people use daily. The results from previous studies are difficult to access to the wider public or data are not gathered int...
Article
Full-text available
Groundwater quality in coastal areas is frequently affected by seawater intrusion as a consequence of intensive water consumption. To achieve “good chemical status” of a groundwater body according to Water Framework Directive the effects of saline or other intrusions should not be observed. Groundwater pumping in former decades has caused a signifi...
Article
Full-text available
Groundwater level time series are of great value for a variety of groundwater studies, particularly for those dealing with the impacts of anthropogenic and climate change. Quality control of groundwater level observations is an essential step prior to any further application, e.g., trend analysis. Often the quality control of data is limited to the...
Article
Full-text available
Estimated natural background levels (NBLs) are needed to assess groundwater chemical status according to the EU Groundwater Directive. They are commonly derived for different substances by applying statistical methodologies. Due to the complexity of the sea water intrusion process, some of those methods do not always provide appropriate assessment...
Data
The presented map is prepared as a georeferenced dataset comprising four raster bands: elevation of the bedrock surface above sea level, locations of boreholes used for the construction of the elevation of the bedrock surface, locations, where buried valleys in geological boreholes were uncovered, and thickness of Quaternary sediments: - Band_1 - d...
Conference Paper
Full-text available
According to the EU WFD, the Member States sharing transboundary GWBs should carry out joint evaluation of the groundwater resources. To ensure this, it is important to establish a representative cross-border groundwater monitoring network. The transboundary area of Estonia (EE) and Latvia (LV) is sparsely populated and features a relatively scarce...
Article
Full-text available
Groundwater utilization and groundwater quality vary in the Baltic and Nordic countries mainly because of different geological settings. Based on the geology, the countries were treated in the following three groups: (1) Fennoscandian countries (Finland, Sweden, and Norway), (2) Denmark and Baltic countries (Estonia, Latvia, and Lithuania), and (3)...
Conference Paper
Full-text available
As groundwater does not follow human-drawn boundaries such as country borders, groundwater pollution in one country can adversely affect groundwater quality and availability in a neighboring country. It is vital to develop a conceptual understanding of shared groundwater resources not only to ensure their protection but also to avoid future conflic...
Article
Full-text available
A new map and digital bedrock surface elevation model of Latvia is presented with a horizontal resolution of 250 m. The local bedrock comprises largely undisturbed layers of Palaeozoic and Mesozoic sedimentary rocks covered by up to 200 m thick Quaternary strata composed mostly of glacigenic and marine sediments. The bedrock surface elevation model...
Article
Full-text available
Study region The Baltic region (Estonia, Latvia, Lithuania) located at the Eastern Shore of the Baltic Sea, Northern Europe. Study focus The spatial and temporal distribution of groundwater drought events over the period 1989–2018 was examined. Standardized Groundwater level Index (SGI) was calculated for six monitoring wells installed into shallo...
Article
Only a few studies have related modern non-pollen palynomorphs to environmental variables, limiting the development of non-pollen palynomorphs training sets. Here, we perform substantial groundwork by developing a training set for freshwater organic-walled algal palynomorphs. We sampled surface sediments from 78 waterbodies across Latvia in northea...
Article
Full-text available
Groundwater pollution by agrochemicals such as nitrogen fertilizers can cause complex biogeochemical transformations to take place in groundwater-dependent ecosystems. To explore the interaction between nitrogen load and groundwater-dependent, spring-fed ecosystems, a study was conducted in Latvia in an area of suspected high nitrate (NO 3 ⁻ ) vuln...
Technical Report
Full-text available
The aim of the document is to create a conceptual understanding of the hydrogeological processes and flow dynamics across the national borders in two different pilot territories - Polish-Ukrainian and Latvian-Estonian border area. Within the framework of this report, assessment of transboundary groundwater resources, as well as the determination of...
Poster
Full-text available
Groundwater level time series are the basis for various groundwater-related studies. The most valuable are long term, gapless and evenly spatially distributed datasets. However, most historical datasets have been acquired during a long-term period by various operators and database maintainers, using different data collection methods (manual measure...
Technical Report
Full-text available
Joint methodology for identification and assessment of GDTEs was developed to identify GDTEs in trans-boundary Gauja-Koiva river basin (funded by Interreg EstLat project “GroundEco”). The methodology and best GDTEs assessment techniques were tested in two pilot areas – Matsi spring fen in Estonia and Kazu leja valley in Latvia. Finally, recommendat...
Chapter
The lack of water in the future will force society to find more sophisticated solutions for treatment and improvement of groundwater wherever it comes from. Contamination of soil and groundwater is a legacy of modern society, prevention of contaminants spread and secondary water reuse options shall be considered. The aim of the book chapter is to g...
Chapter
Dynamic interactions between ground- and surface water are widely known, but the role of groundwater in terrestrial and aquatic ecosystems is often poorly understood and documented due to the spatiotemporal complexity. Many countries have not yet completed the assessment of groundwater dependent ecosystems (GDEs). GDEs are valuable ecosystems that...
Poster
Full-text available
A project that aims to enhance sustainable management of common groundwater resources and associated ecosystems in the transboundary Gauja-Koiva river basin (Latvia-Estonia). (1) selection of GDTE types (2) additional criteria in selecting GDTEs (3) identification of GDTEs in Gauja–Koiva river basin (4) quantity assessment and quality assessment...
Conference Paper
Full-text available
Groundwater dependent ecosystems (GDEs) are valuable ecosystems that depend on groundwater input and cannot be considered and assessed separately. Dynamic interactions at the surface-groundwater interface are widely recognized, but the role of groundwater in terrestrial ecosystems is not well documented. Any changes in the water supply or chemical...
Article
The main emphasis of this research was to describe air pollution level and dispersion in a typical street canyon (Valdemara Street in Riga (Latvia) city centre), afterward to postulate potential development scenarios and perform modelling in order to understand the influence on air pollution level. For this purpose special mathematical model was us...
Poster
Full-text available
We are undertaking a multidisciplinary investigation of two pilot sites: Matsi spring mires in Estonia and Kazu leja subglacial paleo-valley with tufa (freshwater lime) deposits in Latvia. The research objective is to explore the extent of groundwater dependence in these sites and to identify the most suitable indicators of groundwater discharge an...
Poster
Full-text available
First project results on development of joint methodology for groundwater dependent terrestrial ecosystem identification and assessment in trans-boundary area (Estonia - Latvia). Abstract available at: https://meetingorganizer.copernicus.org/EGU2019/EGU2019-6016.pdf
Article
Full-text available
Mathematical models are intensively used in environmental science for various reasons – status quo assessment, statistical modeling, forecasting, and planning, scenario analysis. Traffic flow and related atmospheric pollution modeling is one of the most complex challenges because of various aspects, - wide versa of affecting factors, daily, diurnal...
Article
Full-text available
Intensive water consumption in former decades caused formation of large depression cone near city Liepāja and resulted with seawater intrusion into Upper Devonian Mūru-Žagaru confined freshwater aquifer. Area affected by seawater intrusion is delineated as separate groundwater body at risk (F5) and according to Groundwater Directive threshold value...
Poster
Full-text available
Pētījuma mērķis ir noskaidrot Latvijas pazemes ūdeņu ķīmiskā sastāva datu piemērotību oksidēšanās-reducēšanās procesu klasifikācijai, un noskaidrot izdalīto grupu atšķirības. The aim of the study is to understand the applicibility of the existing groundwater chemistry data for classification of redox processes and to assess the differences in the g...
Poster
Full-text available
Groundwater quality in coastal areas is frequently affected by seawater intrusions as a result of extensive water pumping. Groundwater pumping in former decades has caused significant seawater intrusion into confined aquifer at city Liepaja, Latvia. Liepāja sea water intrusion is a part of F1 groundwater object (GWO) in Venta River basin and also i...
Article
Full-text available
Groundwater is the main drinking water source in Latvia, and Quaternary groundwater is widely used in households due to shallow occurrence. The identification of vulnerable areas is important for better water management and protection of deeper, more intensively used aquifers. The existing groundwater vulnerability map of Latvia does not take into...
Conference Paper
Full-text available
This paper presents first results of monthly water stable isotope monitoring programme covering the most important surface and groundwater types in the Salaca River basin. The aim is to characterise the isotopic values of different water types in the Salaca River basin, and test if their contribution can be identified in the Salaca river runoff. A...
Chapter
Full-text available
Infiltrācijas mērījumi lauka apstākļos ir nozīmīgs informācijas avots, pēc kā var no­vērtēt gan ūdens infiltrācijas ātrumu, gan arī aprēķināt filtrācijas koeficientu ģeoloģiskajai videi in situ apstākļos. Šāda veida eksperimenti tiek lietoti ļoti plaši gan lauksaimniecības, gan urbanizētas vides problēmu risināšanā. Parasti infiltrācijas eksperimen...
Poster
Full-text available
The aim of this study is to determine geochemical processes denoting trace element levels and variations in the fresh groundwater in Latvia. The database of 1398 groundwater samples containing records about major ion chemistry, trace elements and geological conditions was made and used. Accuracy of groundwater analysis and errors were determined an...
Conference Paper
Full-text available
Buried subglacial valleys are widely distributed in glaciated regions and they can have great influence on groundwater flow and hence on groundwater resources. The aim of this study is to evaluate the effect of the buried valleys on groundwater flow in a confined aquifer (Middle Devonian Eifelian stage Arukila aquifer, D2ar) applying numerical mode...
Conference Paper
Full-text available
Groundwater in karst environments tends to have difficulties to distinguish multiple flows if several sources of water are present. Skaistkalne vicinity faces with such situation where old groundwater, fresh groundwater and inflow from river Iecava occurs. Attempts were made to distinguish groundwater residence time of multiple components of water...
Article
Full-text available
The present study describes long term PM 10 and PM 2.5 changes in typical street canyon with particular emphasis on seasonal, diurnal variations in context with meteorological data. In order to understand PM 10 pollution sources during 28 April 2007-31 December 2007, chemical composition measurements were done with particular emphasis on heavy meta...
Conference Paper
Full-text available
Carbonate aquifers show a very wide range of hydrogeological characteristics. Carbonate rock hydrogeology display two extremes: on one hand hydrogeological properties of the carbonates are governed by the pathways of the preferential groundwater flow typical in karstic regions, on the other - some carbonate aquifers behave almost like a homogeneous...
Poster
Full-text available
Trace element content, source and distribution regularities in groundwater of Baltic Artesian basin
Article
Full-text available
Aquifer fluid conductivity properties describe ability of sediments to transmit groundwater, and consequently govern the groundwater flow. Studies and knowledge of hydraulic conductivity (K), transmissivity and storativity for the particular aquifer is of great importance for hydrogeological problem solving process. This study presents the results...
Article
Full-text available
In this study correlation of hydraulic conductivity, deposit grain size distribution and lithology has been studied for the Upper Devonian Gauja aquifer in Latvia. Based on results of this study three areas with different characteristic values of hydraulic conductivity were distinguished in the distribution field of the Gauja aquifer. Estimation of...

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Projects

Projects (4)
Project
The aim of the project is to promote coordinated management and integrated protection of transboundary groundwater by creating a geoinformation platform (an integrated GIS modelling environment for the creation of digital hydrogeological maps and simulations of the quantity and quality of transboundary groundwater). As a part of the project, two cross-border clusters will be created, representing two geographical regions: Baltic and Eastern Europe. The project No.2018-1-0137 benefits from a € 2.447.761 grant Iceland, Liechtenstein and Norway through the EEA and Norway Grants Fund for Regional Cooperation. Duration: 1 September 2020 - 31 Dec 2023 Project homepage: [under development] Partnerships: (1) Polish Geological Institute - National Research Institute (lead partner) (2) State Enterprise "Ukrainian Geological Company" (3) Geological Survey of Estonia (4) DC of NJSC "NADRA UKRAJYNY" "Zahidukrgeologiya" (UA) (5) Intergraph Polska Sp. z o.o. (PL) (6) University of Latvia, Faculty of Geography and Earth Sciences (7) The Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine (8) Latvian Environment, Geology and Meteorology Centre (9) Geological Survey of Norway
Archived project
The project aims to promote sustainable management of shared groundwater resources in a trans-boundary area and implement EU Water policies, mainly Water Framework Directive. The goal will be achieved by (1) development of a common approach for status assessment of groundwater bodies, (2) implementation and testing of developed approach in the Latvian-Estonian trans boundary Gauja-Koiva and Salaca-Salatsi river basin districts, (3) development of common understanding about groundwater dependent ecosystem management, (4) raising public awareness and interest in groundwater management and protection. Find more about project and newest project results/events at bit.ly/WaterAct-project Partnerships: (1) Latvian Environment, Geology and Meteorology Centre, Hydrogeology Division (lead partner) (2) Ministry of the Environment of the Republic of Estonia (3) Geological Survey of Estonia (4)Tallinn University, Institute of Ecology (5) Nature Conservation Agency, Nature Protection Department (LV) (6) University of Latvia, Faculty of Geography and Earth Sciences (7) Vidzeme Planning Region (LV) (8) Estonian Environment Agency Project No. Est-Lat155 is financed by Interreg V - A Estonia - Latvia Cross - border cooperation programme (www.estlat.eu).
Project
The aim of the project is to develop novel integrated groundwater level assessment approach that links meteorological forcing and hydrogeological setting to groundwater drought with the ability to predict groundwater drought severity depending on catchment characteristics in the presence of climate change. The research will consider the Baltic Artesian Basin that is a large groundwater flow system spanning the territories of the Baltic states Estonia, Latvia, Lithuania as well as adjacent territories at its margins. However, the results will be applicable worldwide as the research focus is on methodological aspects of understanding the groundwater drought phenomena including catchment characteristics as a novelty. Find more about GURU project: bit.ly/GURUproject This research is funded by the Latvian Council of Science, project “Spatial and temporal prediction of groundwater drought with mixed models for multilayer sedimentary basin under climate change”, project No. lzp-2019/1-0165