Long-term water temperature trends of the Warta River in the years 1960–2009

Ptak, Mariusz; Sojka, Mariusz; Kałuża, Tomasz; Choiński, Adam; Nowak, Bogumił

doi:10.1016/j.ecohyd.2019.03.007

Cited by 27 publications

(13 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mean wa ter tem per a ture (T) of the Warta shows low variabil ity along the river course, i.e. rang ing from 9.5 to 10.3°C, and cy cling from <2°C in Jan u ary to >20°C in July (Ptak et al, 2019); how ever, mean T was found to in crease by 0.096-0.281°C per de cade dur ing the study pe riod. In re cent years there has been a sig nif i cant short en ing of times of freezing on the river (Nowak et al, 2019), while in creas ingly fre quent pe ri ods of low wa ter stages and droughts have been re corded dur ing sum mer pe ri ods.…”

Section: Study Areamentioning

confidence: 91%

“…Three cit ies with a pop u la tion of more than 100,000 are lo cated along the river course (Poznañ, Czêstochowa and Gorzów Wlkp.) and 22 cit ies with a to tal pop u la tion of 1,280,000 (Ptak et al, 2019).…”

Section: Study Areamentioning

confidence: 99%

“…High-wa ter stages typ i cally oc cur from Feb ru ary to May, whereas low-wa ter stages are ob served from June to Sep tem ber, un less a rain fall-trig gered high-wa ter stage oc curs. In re cent years, how ever, this has changed with the in flu ence of global warm ing (Ptak et al, 2019).…”

Section: Study Areamentioning

confidence: 99%

See 2 more Smart Citations

A two-decade record of variations in suspended sediment in the Warta River, a lowland river in western Poland

Skolasińska

Nowak²,

Bradtke³

2020

Self Cite

View full text Add to dashboard Cite

Fluctuations in suspended sediment concentration (SSC) has been investigated in the Warta River (western Poland), based on data obtained for the period 1961–1980 from three gauge stations located in upstream, middle-stream and downstream areas. Over the two decades, the SSC values demonstrated wide fluctuations and an overall increase at each gauge station. No significant correlation was generally observed between SSC and discharge but high SSC was found to follow low discharge and increasing temperature during the summer seasons in some years. Measurements of SSC and discharge were used to estimate total annual suspended sediment load (SSL). SSL values were found to increase downstream along with an increase in discharge. SSC decreases along the river course. However, when it comes to changes over time, SSL variability was mainly determined by SSC changes. The maximum SSC values were primarily caused by anthropogenic factors: the disposal of mine wastewater upstream, river training works, increased urbanisation and the intensification of sewage disposal. Where the river catchment has been greatly affected by anthropogenic factors, a denudation index calculated solely based on SSC and discharge does not appear to reflect the actual denudation rate, and must be treated with caution.

show abstract

Section: Study Areamentioning

confidence: 91%

Section: Study Areamentioning

confidence: 99%

See 1 more Smart Citation

A two-decade record of variations in suspended sediment in the Warta River, a lowland river in western Poland

Skolasińska

Nowak²,

Bradtke³

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additionally, the slope of the fitted linear regression model was used to identify the rate of change per decade. It should be noted that there are also other trend tests available such as Sen's slope estimator [43,44].…”

Section: Investigation Of Changesmentioning

confidence: 99%

Changes in the Compound Drought and Extreme Heat Occurrence in the 1961–2018 Period at the European Scale

Bezak

Mikoš

2020

Water

View full text Add to dashboard Cite

Compound extreme weather events can cause large economic damage and endanger human lives. Therefore, identification of changes in such compound event frequency and magnitude is important information that could be useful for decision makers and practitioners in water management and agriculture sector. This is especially the case for dry hazards that can be significantly influenced by the increasing air temperature and can have significant impact on water availability and consumption as well as on agricultural production. This study investigated changes in the compound occurrence of drought and extreme heat at the European scale using Uncertainties in Ensembles of Regional Reanalyses (UERRA) regional reanalysis data for the 1961–2018 period. The effective drought index (EDI) and the air temperature percentile threshold were used for the identification of the compound events at the catchment scale where entire Europe was divided into more than 4000 catchments. The results revealed multiple hotspots of compound drought and extreme heat events such as parts of Western Europe, Italy, Balkan Peninsula and Northern and Eastern Europe. At the continental scale, no uniform trend pattern could be detected. However, multiple areas with either positive or negative changes were identified. A positive change was characteristic for parts of Western Europe, Italy, Balkan Peninsula, etc. In these cases, the trend was mostly driven by the decreasing total precipitation trend and was not directly affected by the increasing air temperature trend. Areas with negative changes include parts of Northern and Eastern Europe and British Isles. In these cases, the detected trend was mostly driven by an increasing total precipitation trend. However, local drivers could be different.

show abstract

“…Growth of aquatic vegetation is the primary biological process affecting flow conditions. This growth is modified by hydraulic and geometric parameters of the channel, as well as other physical factors (light, temperature, changes in water levels) along with chemical, edaphic, and biotic factors [14,15]. However, the main factor initiating the whole cascade of resulting phenomena is connected with sunlight, which, in association with biogenic compounds availability, limits productivity of aquatic ecosystems [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Modeling of River Channel Shading as a Factor for Changes in Hydromorphological Conditions of Small Lowland Rivers

Kałuża

Sojka

Wróżyński

et al. 2020

Water

Self Cite

View full text Add to dashboard Cite

The ecological water quality in rivers and streams is influenced both by the morphological factors (within the watercourse channel and by the dynamic factors associated with flow), as well as biological factors (connected with the flora and fauna characteristic of its specific area). This paper presents an analysis of the effect of river channel shading by trees and shrubs on hydromorphological changes in a selected reach of the Wełna River, Poland. The analysis was conducted on two adjacent cross-sections (one in a reach lined with trees, the other in an open area with no tree or shrub vegetation). Data were collected during field surveys in the years 2014 and 2019. According to the Water Framework Directive, the Wełna River represents a watercourse with small and average-sized watershed areas, with sand being the dominant substrate of the river bottom. Flow volume, distributions of velocity in the sections, as well as substrate grain-size characteristics and river bottom morphology, were determined based on field measurements. In the study, the leaf area index (LAI) of vegetation was measured in the reach lined with trees, while the number and species composition of macrophytes were determined in the investigated river reaches. Moreover, a digital surface model (DSM) and Geoinformation Information System GIS tools were used to illustrate variability in shading within the tree-lined reach. The DSM model was based on Light Detection and Ranging (LIDAR) data. The results of this study enable us to establish the relationship between river shading by vegetation covering the bank zone, and changes in hydromorphological parameters of the river channel.

show abstract

Long-term water temperature trends of the Warta River in the years 1960–2009

Cited by 27 publications

References 60 publications

A two-decade record of variations in suspended sediment in the Warta River, a lowland river in western Poland

A two-decade record of variations in suspended sediment in the Warta River, a lowland river in western Poland

Changes in the Compound Drought and Extreme Heat Occurrence in the 1961–2018 Period at the European Scale

Modeling of River Channel Shading as a Factor for Changes in Hydromorphological Conditions of Small Lowland Rivers

Contact Info

Product

Resources

About