scholarly journals Variability of morphological conditions of the Vistula river channel in the section Czerwińsk-Kępa Polska

2015 ◽  
Vol 47 (1) ◽  
pp. 19-29
Author(s):  
Zbigniew Popek ◽  
Michał Wasilewicz
Keyword(s):  
Morphological Changes ◽  
River Channel ◽  
Channel Width ◽  
Channel Changes ◽  
Fluvial Deposits ◽  
Archival Material ◽  
Vistula River ◽  
Main River ◽  
Main River Channel ◽  
Floodplain Area

Abstract: Variability of morphological conditions of the Vistula river channel in the section Czerwińsk-Kępa Polska. The paper presents an assessment of morphological changes that occurred in the Vistula river channel in selected section of about 33 km long, located in the middle of the Vistula river course between Czerwińsk and Kępa Polska (km 576–609). Based on the analysis of archival material from 1972–2009, a characteristics of river channel changes, taking primarily into account the horizontal layout (shape in the plan), was obtained. An attempt was made to estimate the trends and rate of transformation of the following parameters in the river channel: width, length, and position of the riverbanks, abundance and size of islands and fluvial deposits, as well as their percentage in the total area of the main river channel and the floodplain area between levees.

scholarly journals Habitat factors differentiating the occurrence of Ostracoda (Crustacea) in the floodplain of a small lowland River Krąpiel (N-W Poland)

2020 ◽  
pp. 23
Author(s):  
Agnieszka Szlauer-Łukaszewska ◽  
Vladimir Pešić
Keyword(s):  
Abiotic Factors ◽  
River Channel ◽  
Water Bodies ◽  
Oxbow Lakes ◽  
Factors Associated ◽  
Main River ◽  
Main River Channel ◽  
Habitat Factors ◽  
Sediment Sorting ◽  
Physical And Chemical

We analysed the occurrence of ostracods in a small river, taking into account all the types of water bodies in the floodplain − these included helocrenes, oxbow lakes, and ponds, as well as the main river channel. The objective of the study was to investigate the variation in ostracod communities and identify those factors determining species distribution. The environmental factors considered were the type of water body, responsible for 17% of the variance, the physical and chemical water properties (29%), and the biotic and abiotic factors associated with the substrate type (23%). Among the factors associated with the substrate, sediment sorting, plant coverage and insolation were the most important. The ostracod fauna of the helocrenes differed from that of the other water bodies in the floodplain. In the water bodies of the Krąpiel valley and in the main river channel, 33 ostracod species were recorded, of which 26 were found in the main river channel. Refugia in the floodplain were the main source of the diversity and abundance of ostracods in the main river channel. The mean density in the main river channel was very low, at 330 indiv. m−2, while in the water bodies of the floodplain it was the greatest, reaching up to 5568 indiv. m−2.

scholarly journals Coleoptera associated with macrophytes of the genus Salvinia in four oxbow lakes in two river basins in southeast Brazil

2015 ◽  
Vol 75 (4 suppl 1) ◽  
pp. 108-118 ◽  
Author(s):  
M. C. Paula-Bueno ◽  
A. A. Fonseca-Gessner
Keyword(s):  
River Basins ◽  
River Channel ◽  
The State ◽  
The Other ◽  
Oxbow Lakes ◽  
Aquatic Fauna ◽  
Southeast Brazil ◽  
Main River ◽  
Main River Channel ◽  
The Difference

Abstract Macrophytes in oxbow lakes represent an important substrate for the Coleoptera. Two oxbow lakes the Rio Paranapanema were studied and the other two Rio Mogi-Guaçu, in the State de São Paulo, Brasil. In this study, there is greater similarity between the communities of Coleoptera of lakes greater connectivity with the main river channel or the difference in the species of Salvinia collected in the lakes studied interferes Coleoptera fauna that uses as substrate. A total of 9,222 specimens of Coleoptera were collected and identified in 10 families and 40 genera. The analysis MDS for abundance of Coleoptera showed the grouping of the oxbow lakes the Paranapanema River and a distancing the oxbow lakes the Mogi-Guaçu. The PERMANOVA test did not reveal any difference in the fauna between the wet and dry periods. It was concluded that the connectivity between river and lake is not decisive for the richness and abundance of aquatic fauna of Coleoptera. Therefore, the richness and abundance of aquatic Coleoptera associated vary with the species of Salvinia used as substrate.

A Comparison of Species Richness and Traits of Riparian Plants between a Main River Channel and Its Tributaries

1994 ◽  
Vol 82 (2) ◽  
pp. 281 ◽  
Author(s):  
Christer Nilsson ◽  
Alf Ekblad ◽  
Mats Dynesius ◽  
Susanne Backe ◽  
Maria Gardfjell ◽  
...  
Keyword(s):  
Species Richness ◽  
River Channel ◽  
Riparian Plants ◽  
Main River ◽  
Main River Channel

scholarly journals Floodplain sediment from a 30-year-recurrence flood in 2005 of the Ping River in northern Thailand

2007 ◽  
Vol 4 (5) ◽  
pp. 3839-3868 ◽  
Author(s):  
S. H. Wood ◽  
A. D. Ziegler
Keyword(s):  
Fine Sand ◽  
Sediment Concentration ◽  
Main Channel ◽  
River Channel ◽  
Northern Thailand ◽  
Main River ◽  
Main River Channel ◽  
Clayey Silt ◽  
Secondary Objective ◽  
Sedimentation Processes

Abstract. This paper documents the nature of flood-producing storms and floodplain deposition associated with the 28 September–2 October 2005 30-year-recurrence flood on the Ping River in northern Thailand. The primary purpose of the study is to understand the extent that deposits from summer-monsoon floods can be identified in floodplain stratigraphy A secondary objective is to document the sedimentation processes/patterns associated with a large contemporary flood event on a medium-sized Asian river. Maximum sediment depths of 15 cm were found on the river levee, within 30 m of the main channel, and at 350 m thickness was 4 cm. Sediment depth generally decreased exponentially with distance away from the main channel. The extent of sediment deposition was about 1 km from the river channel. However, 72% of the sediment was deposited within an oval-shaped area 200–400 m from the main channel and centered on a tributary stream, through which sediment-laden water entered the floodplain, in addition to overtopping the levee of the main channel. Sediment concentration during the flood was estimated at 800–1500 mg L−1; and we believe the sediment was delivered by flows of well-mixed flood water occurring over a 1–2 day period. These data suggest that flood-deposited strata related to 30-year recurrence floods is only likely to be preserved in deposits located relatively close to the main river channel where fine sand and clayey coarse silt deposits have thicknesses of at least 5–10 cm. These relatively thick deposits would survive bioturbation, whereas more distal areas with thin clayey silt deposits would not.

scholarly journals Linkages Between Sinuosity Index and Flood Sustainability: A Study of Morna River (Maharashtra), India

2021 ◽  
Vol 16 (2) ◽  
pp. 649-661
Author(s):  
Nilesh K. Susware ◽  
Jagdish B. Sapkale ◽  
Vinaya N. Susware ◽  
Shubham K. Gavhane
Keyword(s):  
Agricultural Land ◽  
Morphological Changes ◽  
Water Discharge ◽  
Research Work ◽  
Flood Management ◽  
River Channel ◽  
Flood Events ◽  
Sinuosity Index ◽  
Channel Changes ◽  
Stability And Instability

The morphological changes in the river channel over periods that occur due to the flood events, affected the sinuosity index of the river channel. The river characteristic like sinuosity also determines the intensity of flood in a channel. Recent flood losses have increased as a result of variability in rainfall; simultaneously such problems are coming up with sustainable development. The attempted research study has been carried out to evaluate and understand the river channel changes and bank stability of the Morna river in Maharashtra. The research work also identified the pattern/planform of the river. Morna river meets Warna river near the Mangle village. Most of the streams in the upper basin area are non-perennial. The occurrence of floods takes place due to seasonal rainfall. An index of Sinuosity was used to analyze variation in river courses, as well as identify stability and instability. Therefore, this may facilitate predicting probable riverbank erosion sites and also support sustainable flood management planning for these sites during forthcoming flood events. The sinuosity index of the Morna river ranges from 1.09 to 1.44. The sinuosity indexes for the Morna river and tributaries of its sub-basins/watersheds have been calculated using geospatial techniques. The disparities in sinuosity indexes of the Morna basin and sub-watersheds having a good correlation with slope of the river , fluvial processes, water discharge and hydraulic aspects of the river channel. Seasonal potential flood risk for the agricultural land may be found at the confluence of the Warna river and its tributary Morna river when it receives heavy rainfall in upstream.

scholarly journals Fish, tributaries of middle Rio Mogi Guaçu, upper Rio Paraná basin, São Paulo state, Southeastern Brazil

Check List ◽  
2009 ◽  
Vol 5 (3) ◽  
pp. 488 ◽  
Author(s):  
Alexandre K. de Oliveira ◽  
Fernando Apone ◽  
José Luís O. Birindelli ◽  
Odney R. Perez Júnior
Keyword(s):  
Sao Paulo ◽  
River Channel ◽  
Southeastern Brazil ◽  
São Paulo ◽  
Paulo State ◽  
Main River ◽  
Main River Channel ◽  
Paraná Basin ◽  
São Paulo State ◽  
Parana Basin

In this paper we compiled a fish list obtained from field collections performed between 1999 and 2005 in four tributaries of the Rio Mogi Guaçu, upper Rio Paraná basin, São Paulo State, Brazil. The collected fishes belong to six orders, 21 families, 60 genera and 82 species. The number of species represents 20 to 30% of the fish richness for the entire upper Rio Paraná basin according to recent estimates. A comparison to earlier published fish lists of the Rio Mogi Guaçu basin, chiefly from its main river channel, is also presented.

scholarly journals Seasonal abundance and breeding habitat occupancy of the Orinoco Goose (Neochen jubata) in western Brazilian Amazonia

2014 ◽  
Vol 24 (4) ◽  
pp. 518-529 ◽  
Author(s):  
WHALDENER ENDO ◽  
TORBJØRN HAUGAASEN ◽  
CARLOS A. PERES
Keyword(s):  
Sandy Beaches ◽  
Dry Season ◽  
River Channel ◽  
Habitat Associations ◽  
Breeding Habitat ◽  
Seasonal Abundance ◽  
Encounter Rate ◽  
Brazilian Amazonia ◽  
Main River ◽  
Main River Channel

SummaryThe Near-threatened Orinoco Goose Neochen jubata is a poorly known South American sheldgoose with a declining population and range distribution. In this study, we surveyed the Orinoco Goose population along the middle reaches of the Rio Juruá, western Brazilian Amazonia, and its first-order tributaries. We quantified the seasonal abundance of geese, pinpointed their approximate breeding season, and examined their habitat associations and the potential effects of human activities on their abundance. Hunting by local villagers was also monitored to assess the offtake rate of this species. Orinoco Goose occurrence in the region was highly seasonal and restricted to the dry season. We estimated a mean dry-season encounter rate of 7.18 ± 2.45 adult individuals per 4-km section along this river. Immature individuals were seen along the river margins from August to December. The species showed a strong preference for sandy beaches and was primarily restricted to the main river channel, with few individuals occurring along tributaries. The encounter rate of this species was also significantly related to fluvial distance from the municipal urban centre and to the level of protection from hunting. Hunting of Orinoco Goose was reported in 12 of the 26 villages monitored. The seasonal appearance of the Orinoco Goose in the region indicates that this is a migratory population. Our study indicates that strict protection of the river margins, and sandy beaches in particular, along the main river channel is likely to be positive for the conservation of this species along the Rio Juruá. However, further knowledge of migration routes is critical for effective protection of both breeding and non-breeding populations.

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