27 research outputs found
The Hydroecological Characterization of the Laucesa
No full textDarba autors: Helēna Trošimova
Bakalaura darba tēma: Laucesas upes hidroekoloģiskais raksturojums
Zinātniskais darba vadītājs: Dr. biol., asoc. profesore Gunta Spriņģe
Darba apjoms: 74 lpp., 29 att., 25 tabulas, 4 pielikumi.
Darbs izstrādāts vides zinātnes apakšnozarē. Tas sastāv no 3 daļām. LR upju raksturojošo rādītāju pētīšana (aprakstīts virszemes ūdensobjekts “Augšdaugava” un Daugavas pieteka – Laucesa). Izmantoto metožu raksturojums. Pētījuma rezultāti un to analīze.
Pētījuma objekts: Daugavas pieteka - Laucesa
Pētījuma priekšmets: Laucesas upes hidroekoloģiskais stāvoklis
Pētījuma mērķis: Izpētīt Daugavas upes pieteku – Laucesu, tās ūdens kvalitāti, izmantojot ķīmiskās un bioloģiskās metodes, kā arī noskaidrot zemes lietošanas veidus un mērķus, kas ietilpst upes sateces baseina apgabalā. Praktiski izmantot šo darbu upes ekoloģisko uzdevumu risināšanā.
Pirmajā daļā apskatīti vispārīgi teorētiskie jautājumi, kas saistīti ar LR upēm, Latgales apgabala virszemes ūdensobjektu un Daugavas upes pieteku – Laucesu. Otrā daļa veltīta ūdens hidroekoloģiskājam kontroles metodēm. Trešajā daļā apskatīti pētījuma rezultāti un veikta iegūto rādītāju analīze.
Bioģēnu elementu daudzums Lauceses upes ūdenī nav pārsniegts, tomēr ir paaugstināts amonija jonu daudzums, kas liecina par piesārņojuma parādīšanos. Makrofītu biocenozes analīzes liecina, ka pēc saprobitātes indeksa upe ir vāji piesārņota.
Tā kā Laucesas sateces baseinā veikta saimnieciskās darbības analīze saistībā ar upes stāvokļa novērtējumu, darba rezultātus var izmantot dabas aizsardzības, ekoloģijas un vides pārvaldības jomās.
Atslēgvārdi: Laucesa, ūdensaugi, b-mezosaproba pakāpe.The author of the research: Helena Troshimova
The theme of the bachelor work: The hydroecological characterization of the Laucesa
The task manager of the scientefic research: Dr. biol., assoc. professor Gunta Springe
The volume of the work: 74 pag., 29 pictures, 25 tables, 4 attachments.
The work has been developed in the environmental science program. It consists of 3 chapters. The characterization of the rivers in the Republic of Latvia (describes the surface water object “Augšdaugava” and the tributary of Daugava – the Laucesa). The characteristic of the applying methods. The result and analysis of the research.
The object of the research: The Laucesa – the tributary of the Daugava
The subject or the research: The hydroekological conditon of the Laucesa
The aim of the research: To investigate the tributary of Daugava – the Laucesa, the quality of the water, using biological and chemical methods. To interpret the usage aims of the land, that contains the river catchment area. Practically the research can be important to solve the ecological problems of the river.
The first chapter deals with general theoretical questions connected with rivers of the Republic of Latvia, the surface water object of Latgale district and the tributary of the Daugava – the Laucesa. The second chapter dedicates to the water hydroecological control methods. The third chapter considers the result of the research and the analysis of the acquired indicators.
The quantity of nutrients in the river water is not exceeded, however ammonium ions quantity increases, that indicates the appearance of the pollution. According to the biocenosis of macrophytes saprobic index, the river is weakly polluted.
The analysis of the economic activity in the river catchment area evaluate the condition of the river, so the results of this work may be used on the environmental protection, ecology and environment management level.
Keywords: the Laucesa, aquatic plant, b-mezosaprobic level
The Quality of Drinking Water in the Left Bank Districts the City of Daugavpils
No full textDarba autors: Helēna Trošimova.
Maģistra darba tēma: Dzeramā ūdens kvalitāte Daugavpils pilsētas kreisā krasta mikrorajonos.
Zinātniskais darba vadītājs: Dr. biol., asoc. profesore Gunta Spriņģe.
Darba apjoms: 96 lpp., 29 att., 15 tabulas, 7 pielikumi.
Darbs izstrādāts vides zinātnes apakšnozarē. Tas sastāv no 3 daļām: LR pazemes ūdeņu raksturojošo rādītāju pētīšana un Daugavpils pilsētas Daugavas kreisā krasta mikrorajonu ūdens apgādes sistēma, izmantoto metožu raksturojums un pētījuma rezultāti un to analīze.
Pētījuma objekts: Dzeramais ūdens akās.
Pētījuma priekšmets: Dzeramā ūdens kvalitāte.
Pētījuma mērķis: Izpētīt Daugavpils pilsētas kreisā krasta mikrorajonu aku dzeramā ūdens kvalitāti, izmantojot ķīmiskās un mikrobioloģiskās metodes, kā arī noskaidrot saimnieciskas darbības ietekmi uz aku dzeramā ūdens kvalitāti un praktiski izmantot darba rezultātus aku ūdens kvalitātes uzdevumu risināšanā.
Pirmajā daļā apskatīti vispārīgi teorētiskie jautājumi, kas saistīti ar LR pazemes ūdeņiem un Daugavpils pilsētas kreisā krasta mikrorajonu aku ūdeņiem. Otrā daļa veltīta ūdens ķīmiskām un mikrobioloģiskām kontroles metodēm. Trešajā daļā apskatīti pētījuma rezultāti un veikta iegūto rādītāju analīze.
Kopumā dzeramā ūdens ķīmisko vielu maksimāli pieļaujamas normas netika pārsniegtas, tādējādi dzeramais ūdens atbilst LR kvalitātes normatīviem. Tomēr mikrorajonu aku ūdens ir ciets. Līdz ar to paaugstināts kalcija un magnija vielu saturs rada ievērojamus zaudējumus, jo ūdens cietība saīsina tehnisko līdzekļu kalpošanas mūžu, samazina mazgāšanas līdzekļu efektivitāti, kā arī palielina enerģijas patēriņu ūdens uzsildīšanai.
Mikrobioloģiskas analīzes pierāda to, kā dzeramajā ūdenī nonāk dzīvnieku un cilvēku izkārnījumi, kas var rādīt saslimšanas darudus mikrorajonu iedzīvotājiem. Dzeramā ūdens mikroorganismu koloniju maksimāli pieļaujamas normas visās akās tika pārsniegtas, tādējādi dzeramais ūdens neatbilst LR kvalitātes normatīviem.
Tā kā mikrorajonu pētītajās paralēli ūdens ķīmiskajām un mikrobioloģiskajām analīzēm veikta saimnieciskās darbības analīze saistībā ar dzeramā ūdens kvalitātes novērtējumu, darba rezultātus var izmantot dabas aizsardzības, ekoloģijas un vides pārvaldības jomās.
Atslēgvārdi: dzeramais ūdens, akas, ķīmiskā kvalitāte, mikrobioloģiskā kvalitāte, piesārņojuma avoti.The author of the research: Helena Troshimova.
The theme of the master thesis: The quality of drinking water in the left bank districts of the city of Daugavpils. The quality of drinking water in the districts of the city of Daugavpils (of Daugavpils) situated on the left bank of the river Daugava. (tvoe nazvanie ok, esli peredelatj, to poluchaetsja slishkom dlinnoe, ja ostavila, ti smotri sama)
The task manager of the scientific research: Dr. biol., assoc. professor Gunta Springe.
The volume of the thesis: 96 pag., 29 pictures, 15 tables, 7 attachments.
The thesis has been developed in the environmental science program. It consists of 3 chapters: The characterization of the underground waters parameters in the Republic of Latvia and the system of the supply of drinking water in the left bank districts of the city of Daugavpils; the characteristic of the applied methods; the result and analysis of the research.
The object of the research: The drinking water in wells.
The subject or the research: The quality of drinking water.
The aim of the research: To investigate the quality of drinking water in wells in the left bank districts of the city of Daugavpils, using chemical and microbiological methods. To interpret the effect of the economic activity on the quality of drinking water in wells. Practically the research can be important to solve the ecological problems of the drinking water from wells.
The first chapter deals with general theoretical questions connected with underground waters of the Republic of Latvia, the drinking water from wells in the left bank districts of the city of Daugavpils. The second chapter is dedicated to the chemical and microbiological methods of water control. The third chapter reflects the result of the research and the analysis of the findings.
Maximum contaminant levels of the chemical parametric value in the drinking water was not exceeded, in that way drinking water conforms to the quality standards of the Republic of Latvia. However there is hard water in the wells of the left bank districts of the city of Daugavpils. Due to increased calcium and magnesium material content there is a considerable damage, because the hardness shortens the lifetime of the technical instruments, reduces the effectiveness of the detergents and also increases the consumption of the energy in the water heating process.
The microbiological analysis show, that animals’ and humans’ faeces reach drinking water supply. So it can cause many illnesses, especially for the vulnerable groups of people. Maximum contaminant levels of the microorganism colony count in the drinking water was exceeded, in that way drinking water did not conform to the quality standards of the Republic of Latvia.
The analysis of the economic activity of the researched places and the district territories relate with the assessment of the drinking water quality, so the results of this work may be used on the environmental protection, ecology and environmental management level.
Keywords: drinking water, wells, the chemical quality, the microbiological quality, pollution sources
Diffusion and Adoption of Information Technology
No full textIt. is well known that t.he introduction of a new technology in one organization not always produces the intended benefits (Levine, 1994). In many cases, either the receivers do not reach the intended level of use or simply the technology is rejected because it does not match with the expectations (true or false) and the accepted psychological effort to use it. The case of formal methods is a paradigmatic example of continual failures. The published cases with problems or failures only constitute the visible part of a large iceberg of adoption cases. It. is difficult to get companies to openly express the problems they had; however, from the experience of the author, failure cases are very common and they include any type of company. Many reasons to explain the failures (and in some cases the successes) could be postulated; however, the experiences are not structured enough and it is difficult to extract from them useful guidelines for avoiding future problems. Generally speaking, there is a trend to find the root of the problems in the technol ogy itself and in its adequacy with the preexistent technological context. Technocratic technology transfer models describe the problems in terms of these aspects. Although it is true that those factors limit the probability of success, there is another source of explanations linked to the individuals and working teams and how they perceive the technology
Biological quality metrics: their variability and appropriate scale for assessing Streams
No full textUdenstilpju monitorings Teicu valsts rezervata 1997. gada
No full textAvailable from Latvian Academic Library / LAL - Latvian Academic LibrarySIGLELVLatvi
Students’ Perceived Priorities on Water as a Human Right, Natural Resource, and Multiple Goods
No full textAs often noted, water is one of the most critical natural resources in the world—one we must take care of so that future generations can enjoy safe water. This study specifically explores university-level water and environmental students’ views on perceived priorities on water. The recent debate on water policy and its complexity is first reviewed, followed by a study on how students perceived water through six predetermined criteria. Interactive learning events (n = 241) were arranged worldwide in 2011–2015 in seven countries and one region: Finland, Latvia, South Africa, Brazil, Mexico, Sri Lanka, USA, and Southern Africa region. The relative distribution of the criteria totaling 100% were as follows: Basic human right 31%, natural resource 25%, economic good 15%, public and social good both 11%, and cultural good 7%. The views did not substantially differentiate despite the different socio-economic conditions. Yet, basic human right should be interpreted wisely remembering environmental, economic, and other realities. Here, the target group consisted of water and environmental students, and it would be very interesting to conduct a comparative study among students in other fields (sociology, economics, etc.). On the whole, we should further analyze the value of water and its priorities to make it easier to manage water resources in the future
THE USAGE OF THE ALTERNATIVE EVALUATION METHODS IN THE INVESTMENT PROJECT DEVELOPMENT
No full textBakalaura darba tēma ir „Alternatīvu novērtēšanas metožu pielietojums investīcijas projektu izstrādē”. Šī darba teorētiskajā daļā ir aplūkotas esošās alternatīvās investīciju projektu novērtēšanas metodes; praktiskajā daļā – metožu pielietošana uz konkrēta piemēra – investīciju projekta esošam Latvijas uzņēmumam SIA”AVG Trade” ar mērķi pieņemt lēmumu par investēšanu vai projekta noraidīšanu. Pēc investīciju projekta izanalizēšanas ar dažādām metodēm, autore secina, ka aplūkotu projektu ir vērts iekļaut kompānijas kapitālbudžetā. Veiksmīgi izstrādāta investīciju projekta finansiāli-ekonomiskā analīze kalpos uzņēmuma īpašniekam par palīglīdzekļi SIA”AVG Trade” tālākai darbības attīstībai un ražošanas realizēšanai.
Atslēgvārdi: projekts, investīcijas, alternatīvas novērtēšanas metodes, finansiāli-ekonomiskā analīze, riska analīze.The theme of the Bachelor’s paper is „Using of alternative evaluation methods in working out of investment projects”. In the theoretical part of this paper there has been investigated existing alternative methods of evaluation of investment projects; the practical part is dedicated to using of the methods basing on particular example – investment project for existing Latvian enterprise ”AVG Trade” Ltd. with aim to decide whether to accept or to decline the project. After analyzing of investment project with different methods, the author concludes that the investigated project has to be included in company’s capital budget. Successfully worked out financially – economic analysis of the investment project will help the owner in further development of”AVG Trade” Ltd.and production.
Keywords: project, investment, methods of alternative evaluation, financially – economic analysis, risk analysis
Long-term hydrobiological monitoring importance for sustainable management of a shallow coastal macrophyte lake in the Baltic Ecoregion
No full textThis literature review analyzes the current state, challenges, and knowledge gaps for an adaptive management of the Engure Long-Term Socio-Ecological Research (LTSER) platform: Lake Engure and its catchment in Latvia.Lake Engure catchment area (644 km2) includes shallow lake (a remnant of the Litorina sea); part of the territory is a nature park and Ramsar site. Most of the catchment area is covered by the pine forests, large areas of marshlands, meadows, deciduous forests, dunes and agricultural lands. It is a biodiversity hotspot: avifauna - 186, vascular plants – 876 species; 44 species of birds, 5 fish species, 3 plant species and 28 habitats are protected at EU level (e.g., Springe et al. (2011), LatViaNature (2024)).It is the largest area of a good quality freshwater habitat 3140 Hard oligo-mesotrophic waters with benthic vegetation of Chara spp. in Latvia. The investigation of the lake flora started at the beginning of 20th century (Kupffer 1907) and continued with similar intensity (Zviedre and Grinberga 2012).Long-term hydrobiological monitoring has been carried out in Lake Engure since 1995; including research of benthic invertebrates, phytoplankton, macrophytes, physical and chemical variables, etc. The phytoplankton community characteristic with low biomass (0.13-0.39 mg/l); taxonomic composition fluctuated without an evident trend (recorded >150 species). The long-term development of the hydroecosystem was related to the lake’s geographical location, basin and morphology, as well as the lake’s history and relationship of biotic and abiotic factors (Springe et al. 2011).The ecosystems of the area have been changed by different human activities historically. The agriculture and main industry (fishing and fish processing) has sharply declined. Nowadays, the highest number of employees is in the service sector, setting a new kind of pressure on the ecosystems of the region (Melecis et al. 2014).A major hydromorphological impact was the excavation of Mērsrags Canal (from lake to the sea) in 1842, which lowered the water level by 1.5 m, halved the catchment area, reduced the open water surface, and increased the lake’s vulnerability to eutrophication.Eutrophication of the lake is expressed by an increase in macrophyte biomass, non typical species abundance un unvegetated areas. Over the last 50 years the overgrowing of the littoral zone with macrophytes, mainly by reeds and bulrush, has been stimulated due to an increased eutrophication until the 90-ies of the 20th century and the cessation of once traditional land-use activities (Springe et al. 2007).In the last decades the lake Engure has also served as a pilot territory for various management measures for both, especially protected aquatic and terrestrial habitats, and species. During several LIFE programme projects since 2001, expansive reed Phragmites australis overgrowth was mowed, fragmented, a mosaic of watercourses and marshy places created, as well as shoreline grasslands restored (e.g., by cattle grazing) (LatViaNature 2024).Even though the lake and its basin are one of the most studied areas in Latvia, a comprehensive monitoring program is lacking. This is particularly important as the lake faces significant challenges, including not only eutrophication, but also the complex and unpredictable impacts of climate change. Enhancing the LTER infrastructure will facilitate comprehensive long-term ecosystem and socio-ecological research at a European scale, providing essential knowledge to support informed decision-making and the implementation of adaptive management strategies
