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Type of publication: conference paper
Type of publication (PDB): Tezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Lysovienė, Jelena;Gasiūnas, Valerijus
Title: Capability of regulated small streams for nutrient retention in the dry season
Is part of: Nordic water 2012 : catchment restoration and water protection : XXVII Nordic hydrological conference : abstracts / editors : Ritta Kamula, Bjorn Kløve, Hanna Arola. Oulu, 2012
Extent: p. 106
Date: 2012
ISBN: 9789514298943
Abstract: Streaming water is capable of self-purification from the influx of pollutants depending on various physical, chemical and biological factors. The objective of this work was the evaluation of nutrient retention factors and their dependencies in small regulated streams artificially changed b. straightening their channels. The main task was to determine the existence of significant relations between nutrient retention in the water of regulated streams and physico-chemical parameters under investigation what allow forecasting the water quality. In the dry season of 2010 - 2011 (from June to October) 5 ranges of regulated streams with a maximum distance of 8.6 km to the pollution source below the settlements of less than 2000 inhabitants were measured for evaluation of nutrient retention dependence on various factors. Streams under investigation are located in the river Nevezis basin in the Middle Lithuania which is characterized by low absolute heights (to 80 - 90 m) and urbanized landscapes intensively used for agriculture and stockbreeding. They are attributed to the same geographical zone with similarities in soil, geological conditions and hydrological regime. The discharge of investigated streams in the analyzed time period fluctuated from 0.0003 to 0.27 m3s-l with respect to their size. Different factors in the process of self - purification downstream the pollution source were measured and evaluated. After the statistical analysis was carried out, the most influential factors affecting the decrease of nutrients appeared to be water discharge, temperature and load from the pollution source. With the impact of factors evaluated, the following dependencies of stream water load with certain pollutants could be observed: total P y=153.2-59.3 xl+4811.4 x2+0.89 x4 total N y=22713.4+385498 x2-1376.6 x3+0.41 x4 here: y - stream water load with pollutants, g d-1
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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