Impacts of excessive nutrients load in aquatic ecosystem

Abstract

The mechanisms of water eutrophication are not fully understood, but excessive nutrient loading into surface water system is considered to be one of the major factors. This paper reviews nutrient inputs to surface water; the role of nutrients in the eutrophication of surface water; the response of biota to nutrient enrichment; monitoring of changes due to eutrophication and the management. The major influencing factors on water eutrophication include nutrient enrichment, hydrodynamics, environmental factors such as temperature, salinity, carbon dioxide, element balance, microbial and biodiversity. With regards of international and national legislative for the ecological status assessment ecological potential, chemical status, biological quality elements, supporting physical-chemical and hydro-morphological quality elements have been investigated. The aim of this paper is to analyse eutrophication and salinization problem, factors affecting this process, its consequences and possibilities of prevention. The partial aim is to evaluate eutrophication state of surface water in Žitný ostrov channel network following the assessment physical-chemical and microbiological indicators in monitored period.

Impacts of riverbed aggradation on groundwater regime in a lowland area

“…A relatively dense monitoring network including precipitation, GW and SW level was established in the area regularly surveyed by the Slovak Hydrometeorological Institute. Several studies were dealing with various aspects of SW and GW in this area, such as the quality and quantity of water resources (Červeňanská et al, 2021;Kováčová, 2022;Schügerl, 2019;Schügerl et al, 2021); riverbed silting processes (Dulovičová, 2019); interaction of the canals with the aquifer (Baroková et al, 2017(Baroková et al, , 2020Dušek and Velísková, 2017;Okhravi et al, 2022b) and more.…”

SWAT model application for sediment yield modeling and parameters analysis in Wadi K’sob (northeast Algeria)

“…The siltation rate rose to 65 Mm 3 year -1 in 2017 which represents about 0.75% of the annual loss of dam capacity (Remini, 2017). In addition, the water erosion and sediment transport represent the first factor that reduces the fertility of agricultural land (Xiong et al, 2024), by leaching nitrogen that concentrates in surface water and leads to its pollution (Siman and Velisková, 2020, Kováčová, 2022, Kováčová, 2023. The sediment transported in streams is usually estimated at the gauging station using in situ measurements of suspended sediment concentration (Achite and Ouillon, 2007).…”

Bed sediment dynamics in the Gabčíkovo-Topoľníky channel: The three-decade case study

“…al., 1999;Zolezzi et. al., 2009;Przybyłek et al, 2017;Monegaglia andTubino, 2019, Kováčová, 2020;2022). The bed sediments, their thickness and structure significantly influence the mutual interaction between surface water in the channels of the channel network and the surrounding groundwater in the whole ŽO area (Fendeková et al, 1998;Krčmář, 2003;Dulovičová et al, 2013;Dušek and Velísková, 2014;Červeňanská et al, 2021).…”