Preliminary geologic map of the middle part of the Eagle River valley, Municipality of Anchorage, Alaska

1980 ◽  
Author(s):  
Henry R. Schmoll ◽  
Ernest Dobrovolny ◽  
Cynthia A. Gardner
Keyword(s):  
Middle Part ◽  
River Valley ◽  
Geologic Map

scholarly journals Changes and contemporary trends in the annual amounts of precipitation in Serbia

2021 ◽  
Vol 44 ◽  
pp. 73-79
Author(s):  
Hristo Popov ◽  
Jelena Svetozarevich
Keyword(s):  
Balkan Peninsula ◽  
Middle Part ◽  
River Valley ◽  
Annual Precipitation ◽  
Precipitation Data ◽  
Southeast Europe ◽  
The Republic ◽  
River Valleys ◽  
Annual Amount ◽  
The Sava River

The Republic of Serbia is а continental country located in the western part of the Balkan Peninsula, in Southeast Europe. In terms of physical characteristics, Serbia is divided into two parts: Pannonian part and mountainous part. The northern part of the country is located in the valley of the Middle Danube, the Sava River valley and the Tisza River valley. In the middle part of the country, the river valleys of the Drina, the Kolubara and the Morava are located. For the purposes of this research, the authors have used the annual precipitation data from 15 meteorological stations distributed throughout the Republic of Serbia. The data from these meteorological stations for the period between 1991 and 2019 has been provided by The Serbian Institute of Meteorology and Hydrology. This data has been used to calculate the annual amount of precipitation, and the trends in annual precipitation.

scholarly journals Effect of slope position on soil particle-size distribution in young glacial landscape (Łyna River valley, NE Poland)

2016 ◽  
Vol 67 (3) ◽  
pp. 140-150
Author(s):  
Paweł Sowiński
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Principal Component ◽  
Middle Part ◽  
River Valley ◽  
Soil Particle ◽  
Slope Position ◽  
Soil Particle Size ◽  
Soil Particle Size Distribution

AbstractThe aim of this paper was to characterize soil particle-size distribution (PSD) of in the middle part of young glacial Łyna River valley in relation to parent materials, soil forming processes and slope position. The study comprised rusty soils, arenosols, clay-illuvial soils, colluvial and alluvial soils located in four slope position: summit / midslope, footslope / toeslope, upper and lower part of floodplain. In order to describe the sedimentological environment and possible heterogenity of the soil formations, sedimentological and granulometric indices were calculated. The relationships between soil fractions in A horizons and environmental variables (slope position and depth of A horizon) were determined using principal component analysis (PCA).The studied soils were poorly sorted with various values of skewness of granulometric distribution (symmetrical, fine and very fine skewed) and kurtosis (mainly very leptokurtic). The value of mean grain diameter was decreasing with slope position which may suggest high dynamics and energy of sedimentological environment in the middle part of Łyna River valley. The analysis of granulometric indices revealed that colluvial deposits were the most homogenous and alluvial formations were the most heterogenous. The results of the statistical analysis showed a positive correlation of the amounts of clay and silt fractions with depth of A horizons. The factor responsible for variability of these fractions was the position on the slope. The A horizons in soils located at the summit and footslope had the highest amounts of sand fractions. While significant increase in the share of finer fractions in soils located in the floodplain was noted.

scholarly journals Geologic map of the upper Arkansas River valley region, north-central Colorado

2017 ◽  
Author(s):  
Karl S. Kellogg ◽  
Ralph R. Shroba ◽  
Chester A. Ruleman ◽  
Robert G. Bohannon ◽  
William C. McIntosh ◽  
...  
Keyword(s):  
River Valley ◽  
Arkansas River ◽  
North Central ◽  
Geologic Map ◽  
Arkansas River Valley

scholarly journals Low terraces of the Styr River valley in the middle part of the Volhyn Upland

2016 ◽  
pp. 101-118
Author(s):  
Roman Hnatyuk ◽  
Taras Novak
Keyword(s):  
Geological Structure ◽  
Middle Part ◽  
River Valley ◽  
Average Height ◽  
Main Attention ◽  
River Level ◽  
The North ◽  
River Terraces ◽  
Loess Deposits ◽  
Constant Altitude

The paper focuses on the description of the low Pleistocene terraces (with the height of up to 20 m above the river level) of the Styr River valley that were identified in the middle part of the upland between Bilche–Krasne villages in the south and Boratyn–Pidhaitsi villages in the north. The main attention is concentrated on the mapping of the terraces and the overview of their outcrops as well as analysis of the boreholes data. The study of the geological structure of the terraces becomes the basis to determine their age. Mapping of river terraces was executed using topographic maps in scale 1:10 000. On the territory where previous researchers identified one or two terraces, we have identified five morphologically distinct cyclic (paired) terraces. The highest low terrace that is widespread territorially is named here the main terrace and the other four that are locally preserved are combined in a complex of minor low terraces. The level of the main Styr terrace has almost constant altitude of about 191–192 m. The average height of the terrace surface is gradually increasing downstream from 12–13 to 14–16 m above river level. Its surface is slightly undulating and complicated by relatively large isometric depressions with the diameter of up to 100 m and more. The slightly meandering forms similar to channels with the plan size comparable with the modern Styr channel occur on the terrace surface. The main terrace is relatively complicated and has mainly two-termed structure – the lower part of sedimentary sequence is composed of normal (perstrative) alluvium of large thickness; the upper part is composed of constrative alluvium accumulated when the river channel was laterally inactive. The terrace is overbuilt by a loess layer a few meters thick that covers floodplain alluvium without a distinct break in accumulation. Geological structure of the minor low terraces is relatively simple and recalls the floodplain structure. Absence of well-expressed paleosols in the alluvial and loess deposits of the low terraces suggests that they were formed during Late Pleniglacial (MIS 2). Key words: river terrace, alluvium, Late Pleistocene, Late Pleniglacial, Volhyn Upland, Styr River valley.

scholarly journals Floristic diversity of selected plant communities on extensive and abandoned grasslands in the Nadwieprzański Landscape Park / Zróżnicowanie florystyczne wybranych zbiorowisk roślinnych ekstensywnych użytków zielonych w Nadwieprzańskim Parku Krajobrazowym

2013 ◽  
Vol 19 (1) ◽  
pp. 77-82
Author(s):  
Marianna Warda ◽  
Ewa Stamirowska-Krzaczek ◽  
Mariusz Kulik
Keyword(s):  
Plant Communities ◽  
Diversity Index ◽  
Floristic Composition ◽  
Middle Part ◽  
Lythrum Salicaria ◽  
River Valley ◽  
Organic Soils ◽  
Floristic Diversity ◽  
Wiener Diversity Index ◽  
Herbaceous Communities

Abstract The paper presents floristic diversity of some plant communities in the Nadwieprzański Landscape Park (middle part of the Wieprz River valley). Phytosociological relevés were made in the years 2005-2007 with Braun-Blanquet method. Species richness was a base to calculate the Shannon-Wiener diversity index. The Wieprz River valley has the character of a floodplain. In its middle reaches, communities of the Molinio- Arrhenatheretea class accounted for nearly 75% of all plant communities in grasslands. Herbaceous communities were represented by associations from the Filipendulion alliance. The greatest diversity (H’ = 3.4) was characteristic for vegetation of the Valeriano-Filipenduletum association. It formed small patches in abandoned meadows. Small patches of plants from the Lythro-Filipenduletum ulmariae association, having a slightly smaller floristic diversity (H’ = 3.0) were found on abandoned meadows located in highly silted and poor organic soils. Characteristic species of herbaceous communities (Filipendula ulmaria, Valeriana officinalis and Lythrum salicaria) occurred also in the sward of abandoned thistle meadows. Typical thistle meadows (Cirsietum rivularis), with the predominance of Cirsium rivulare developed in land depressions, not far from the Wieprz River, in the vicinity of abandoned drainage ditches and along the edges of the valley. However, the total abandonment of these meadows leads to changes in floristic composition of the sward and to succession towards herbaceous communities.

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