Magnitude of Fluvial Transport and Rate of Denudation in A Non-Glacierised Catchment in A Polar Zone, Central Spitsbergen

2014 ◽  
pp. n/a-n/a ◽  
Author(s):  
Józef Szpikowski ◽  
Grażyna Szpikowska ◽  
Zbigniew Zwoliński ◽  
Andrzej Kostrzewski
Keyword(s):  
Polar Zone ◽  
Fluvial Transport

Long-term modeling of soil loss and fluvial transport processes in a mountainous semi-arid basin, southern Spain

2020 ◽  
pp. 1733-1740 ◽  
Author(s):  
A. Millares ◽  
J. Herrero ◽  
M. Bermúdez ◽  
J.F. Leiva ◽  
M. Cantalejo
Keyword(s):  
Soil Loss ◽  
Transport Processes ◽  
Southern Spain ◽  
Fluvial Transport ◽  
Semi Arid

scholarly journals The Developmental Stages of An Accumulative Cone of Dry Valley as an Indication of Change in Natural Environment Conditions (Western Pomerania)

2013 ◽  
Vol 32 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Renata Paluszkiewicz
Keyword(s):  
Natural Environment ◽  
Developmental Stages ◽  
Main Stage ◽  
Stages Of Development ◽  
Fluvial Transport ◽  
Dry Valley

Abstract The aim of this paper is to present the stages of development of an alluvial cone as an indication of change in natural environment conditions. a detailed research was conducted within the upland regions of Drawsko Lakeland. At the valley mouth of one of the erosional-denudational valleys an alluvial cone in question splays out. The imparity between the capacity of the erosional-denudational valley and the capacity of the alluvial cone indicates that the main stage of erosion had taken place before the cone’s deposition. During the beginning stage the material acquired from the dissection was most likely delivered directly to the channel of Dębnica river and was incorporated in the fluvial transport. The cone was formed during the later stage. The results of the radiocarbon analyses reveal that the formation of the alluvial cone and the valley associated with the cone took place during the Subatlantic. It was also estimated that the cone aggraded with the rate of approximately 3,9 mm per year

The age of dust—A new hydrological indicator in arid environments?

Geology ◽  
2021 ◽  
Author(s):  
Simon Turner ◽  
Heather Handley ◽  
Paul Hesse ◽  
Bruce Schaefer ◽  
Anthony Dosseto
Keyword(s):  
Trace Element ◽  
River Sediments ◽  
Preliminary Evidence ◽  
Arid Environments ◽  
Physical Weathering ◽  
Uranium Series ◽  
Fluvial Transport ◽  
And Storage ◽  
Isotope Analyses ◽  
Dust Deposits

Dust plays important roles in the environment, and there has been much interest in the formation, provenance, and age of the world’s dust deposits. Ongoing debates are concerned with the importance of glacial grinding versus eolian abrasion and fluvial transport in the formation of silt-sized particles. Short-lived uranium-series isotopes afford new insights because they can be used both for provenance fingerprinting and for constraining the integrated age of chemical and physical weathering and subsequent transport and storage of sediments. Here we present trace element and Sr, Nd, and U-series isotope analyses from a number of Australian dusts and suspended river sediments remobilized during floods a year later. The inferred ages of the Australian dust appear to be linked to aridification and the loss of inland megalakes ~30–120 k.y. ago. This provides preliminary evidence that the age of dust may provide a new hydrological indicator in arid environments.

MARINE STEROLS: VI. STEROL BIOSYNTHESIS IN MOLLUSCS AND ECHINODERMS

1960 ◽  
Vol 38 (1) ◽  
pp. 997-1002 ◽  
Author(s):  
U. H. M. Fagerlund ◽  
D. R. Idler
Keyword(s):  
Sterol Biosynthesis ◽  
Major Portion ◽  
Mytilus Californianus ◽  
Polar Zone ◽  
Pisaster Ochraceus ◽  
Saxidomus Giganteus

The in vivo incorporation of 2-C14-acetate into digitonin-precipitable material has been demonstrated in two molluscs, mussel (Mytilus californianus) and clam (Saxidomus giganteus). Clams are able to convert 11,14-C14-squalene into digitonin-precipitable material. When the azoylester of the material isolated from clams is chromatographed, the major portion of the radioactivity follows the least polar zone, which has previously been found to contain mainly monounsaturated Δ5-sterols.A starfish (Pisaster ochraceus) has been shown in vivo to convert ingested 4-C14-cholesterol to 7-cholestenol.

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