ALLUVIAL CONE CONSTRUCTION BY ALPINE MUDFLOW IN A HUMID TEMPERATE REGION

1965 ◽  
Vol 2 (4) ◽  
pp. 270-277 ◽  
Author(s):  
C. G. Winder

In a humid, temperate area of central-western Alberta, a mudflow occurred along Hell's Creek, a short tributary of the Smoky River in July, 1962, during a heavy rainstorm. Flows had not occurred during the previous 3 years, even though rains of comparable intensity had fallen. The source area is a steep-sided rock amphitheater, cut in deformed shales and siltstones, and almost devoid of vegetation. The mud moved over a mile in a narrow stream valley and spread across the lower part of an alluvial cone. The exposed lithology of the cone suggests that mudflow is the principal agent in construction of this and other cones of the region. Deposition of the cone has diverted the course of a large river.

Author(s):  
A. D. Stewart

ABSTRACTMass balance equations are derived which link the ratios Ts/ (suspended load/dissolved load from chemical weathering) and Tb/Ts (bed load/suspended load), with any two geochemical components present in the source rock and the alluvial system. If the dissolved load is unknown the ratios can be estimated from the relatively insoluble silica and alumina. The ratio Ts/, which for large river basins depends on climate and relief, can thus potentially be determined from ancient alluvial sequences.The equations help define the source composition of a group of 13 modern rivers for which Ts, and alluvial geochemistry are known. These rivers together drain 27% of the continental surface. For a source area with the average continental sandstone to shale ratio of 0·6 the observed average value of Ts/ is obtained when limestone, sandstone and shale are present in the proportions 6·7:21·6:35·7. The figure of 64% sediment in the source area is very similar to the 66% determined by Blatt and Jones (1975) from geological maps of the continents. The equations also show that average bed load transport rate into these 13 basins is about 27% of total transport, and into the Amazon basin about 37%. Bed load transport rates out of the basins, into the sea, are relatively very small.


2002 ◽  
Author(s):  
William P. Bottom ◽  
James Holloway ◽  
Gary J. Miller ◽  
Alexandra Mislin ◽  
Andrew Whitford

2021 ◽  
Vol 34 (2) ◽  
pp. 04020118
Author(s):  
Song Zhou ◽  
Guan-Lin Ye ◽  
Lei Han ◽  
Wang Jian-Hua

2020 ◽  
Vol 42 (3) ◽  
pp. 293-303
Author(s):  
VALERIY BONDAREV

The theoretical and methodological basis of the systems hierarchical spatial and temporal analysis of a drainage basin, which addresses the problems of effective management in socio-natural systems of different ranks, is considered. It is proposed to distinguish 9 orders of forms that are relevant to the analysis of drainage basins, where the first level is represented by individual aggregates and particles, and the last - by basins of large and the largest rivers. As part of the allocation of geological, historical and modern time intervals, the specificity of the implementation of processes in basins of different scales from changing states, through functioning to evolution is demonstrated. The interrelation of conditions and factors that determine the processes occurring within the drainage basins is revealed. It is shown that a specific combination of conditions and factors that determine processes in the drainage basin is associated with the hierarchy of the objects under consideration, i.e. the choice of a spatial-temporal hierarchical level is crucial for the organization of study within drainage basins. At one hierarchical level, some phenomenon can be considered as a factor, and at another - as a condition. For example, tectonic processes can be considered as an active factor in the evolution of large river basins in the geological perspective, but for small drainage basin, this is already a conservative background condition. It is shown that at the historical time the anthropogenic factor often comes to the fore, with the appearance of which in the functioning of the drainage basin, there is a need to take into account the entire complex of socio-environmental problems that can affect the sustainable state of various territories, especially in the field of water and land use. Hierarchical levels of managing subjects are identified, which are primarily responsible for effective management at the appropriate hierarchical level of the organization of the socio-natural system within the catchment area, starting from an individual to humankind as a whole.


Author(s):  
Marcela Stárková ◽  
Štěpánka Mrázová ◽  
Tamara Sidorinová
Keyword(s):  

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