scholarly journals CLASSIFICATION OF ALLUVIAL FANS IN JAPAN BY TOPOGRAPHICAL AND GEOLOGICAL DATA OF DRAINAGE BASINS

1982 ◽  
Vol 55 (5) ◽  
pp. 334-349 ◽  
Author(s):  
Kyoji SAITO
Keyword(s):  
Alluvial Fans ◽  
Geological Data ◽  
Drainage Basins

The effects of intensive rainfalls (flash floods) on the development on the landforms in the Kőszeg Mountains (Hungary)

2012 ◽  
Vol 4 (1) ◽  
Author(s):  
Márton Veress ◽  
István Németh ◽  
Roland Schläffer
Keyword(s):  
Catchment Area ◽  
Flash Floods ◽  
Steep Slope ◽  
High Density ◽  
Alluvial Fans ◽  
Channel Changes ◽  
Great Thickness ◽  
Superficial Deposit ◽  
Catchment Areas

AbstractThe effects of the intensive rainfall episodes in the years 2009 and 2010 in the Kőszeg Mountains were investigated. Channel profiles were constructed at various times during these periods, which were used to describe the channel changes. We measured the length of the incised and filled sections on multiple occasions. We could establish the degree and the direction of the changes using this data. The sediment veneer that developed in the area of Kőszeg town was mapped and its conditions of development were examined. The erosion and accumulation landforms developed during these years were classified and described. These forms are the following: rills, gullies, alluvial fans and sediment veneer. We distinguished and characterised those which had previously formed, but they were changed or increased (the channels). We established the conditions under which the sediment veneer can develop, furthermore those conditions which can increase the chance of the formation of this landform. These conditions are the following: the high density of roads in the catchment areas of valleys leading to settlements, the great thickness of superficial deposit, and the steep slope of the surface of the catchment area. We created theoretical classification of the morphological environment where the development of sediment veneer may happen and identified settlements with structures which promote or prevent the development of the sediment veneer. We determined the probability of the development of the sediment veneer at some settlements in Kőszeg, and suggestions have been given to decrease the chance of the development of this sediment veneer.

A CLASSIFICATION OF WEST MALAYSIAN DRAINAGE BASINS

1971 ◽  
Vol 61 (3) ◽  
pp. 460-467 ◽  
Author(s):  
R. J. EYLES
Keyword(s):  
Drainage Basins

Area of distribution and conditions of loess forming in the South Urals

2020 ◽  
pp. 16-30
Author(s):  
S. S. Popov ◽  
G. N. Shilova ◽  
A. O. Khotylev
Keyword(s):  
Middle Pleistocene ◽  
South Urals ◽  
Textural Features ◽  
Alluvial Fans ◽  
The South ◽  
Drainage Basins ◽  
Fluvial Terrace ◽  
Palynological Data ◽  
The Third ◽  
Lithological Composition

The report presents the results of comprehensive studies of loess-like formations that are common within drainage basins of Ay and Yuruzan rivers (South Urals). Loess complexes associated with the third fluvial terrace. The lithological composition, structural and textural features indicate that the loess were formed like the part of alluvial fans, planned under the third fluvial terrace. The obtained palynological data indicate the formation of deposits in the Middle Pleistocene during the Odintsovo interglacial and Moscow glaciation.

Classification of Drainage Basins Based on Readily Available Information

2016 ◽  
Vol 30 (15) ◽  
pp. 5559-5574 ◽  
Author(s):  
Ino Papageorgaki ◽  
Ioannis Nalbantis
Keyword(s):  
Drainage Basins ◽  
Available Information

scholarly journals Comparative geomorphological observations in two groups of alluvial fans of Sperchios and Eurotas regions, Greece

2007 ◽  
Vol 40 (4) ◽  
pp. 1552
Author(s):  
A. Kontou ◽  
K. Gaki-Papanastasiou ◽  
H. Maroukian
Keyword(s):  
The Other ◽  
Alluvial Fans ◽  
Morphometric Characteristics ◽  
Drainage Basins ◽  
Mean Size ◽  
Formation And Evolution ◽  
The Mean

In the present study two groups of alluvial fans from two different regions in Greece were comparetively studied, the first in the region of Sperchios river and the second in the region ofEurotas river. Distinct morphometric characteristics of the drainage basins of the tributaries Ts er lias, Xerias, Gorgopotamos, Kerasias, Retsas and Kakaris, as well as their fans were measured and compared. Furthermore ,the longitudinal stream profiles were mapped, pebble measurements were made and contour crenulations of the fans were studied. In gravelometry, it was found that the mean size M of the pebbles decreases from the apex to the apron of the fan. The crenulation analysis showed that the fans of the streams ofEurotas region have undergone greater erosion than those of Sperchios region. Remarkable differences exist between the fans of the two regions. These results lead to the conclusion that recent tectonism, the prevailing lithology and climate are responsible for the formation and evolution of the fans and also influence their shape, area and all the other morphometric characteristics

scholarly journals CLASSIFICATION OF ALLUVIAL FANS IN TOHOKU DISTRICT BASED ON CLUSTER ANALYSIS

1980 ◽  
Vol 53 (11) ◽  
pp. 721-729 ◽  
Author(s):  
Kyoji SAITO
Keyword(s):  
Cluster Analysis ◽  
Alluvial Fans

scholarly journals Analysis of relationships among coastal alluvial fans and their contributing catchments in North Evoikos Gulf (Central Greece).

2016 ◽  
Vol 47 (1) ◽  
pp. 344 ◽  
Author(s):  
K. Valkanou ◽  
E. Karymbalis ◽  
D. Papanastassiou ◽  
K. Gaki-Papanastassiou ◽  
P. Giles
Keyword(s):  
Debris Flow ◽  
East Coast ◽  
Drainage Basin ◽  
Active Faults ◽  
Alluvial Fans ◽  
Drainage Basins ◽  
Central Greece ◽  
Depositional Processes ◽  
Tectonically Active ◽  
The Relationship

This paper deals with the morphometric analysis of 42, late Holocene, coastal alluvial fans located along the coasts of the tectonically active North Evoikos Gulf in central Greece. Thirty six of the fans have been formed by streams that discharge along the east coast of the Gulf (Evia Island) while the rest are located on the opposite side (Continental Greece). Selected morphometric parameters of the drainage basins were measured using topographic maps at the scale of 1:50,000 while those of the fans were derived from detailed topographic diagrams at the scale of 1:5,000 utilizing ESRI’s ArcGIS9.3 software. Fans were classified into four groups according to the primary depositional processes (fluvial and/or debris flow). Another classification criterion was the relationship between the location of the fan-catchment system and the local tectonic patterns (active faults). Fan-basin morphometric relationships for each fan group were also investigated. A strong positive relation was found between the size of the fan and the drainage basin area while the correlation between drainage area and fan slope was negative. Large catchments located near fault terminations have formed gently sloping fans dominated by fluvial processes, whereas torrents with small rough drainage basins, developed on the footwall, have formed steep fans likely dominated by debris-flow along the east coast of the Gulf

Missing evidence for landscape transience induced by tectonic forcing since the Late Quaternary in the steep marginal escarpments of the Korean Peninsula

2021 ◽  
Author(s):  
Jongmin Byun
Keyword(s):  
Korean Peninsula ◽  
Late Quaternary ◽  
Upstream Migration ◽  
Drainage Basins ◽  
Field Surveys ◽  
Eastern Margin ◽  
Rock Types ◽  
Fine Resolution ◽  
Tectonic Forcing

<p>Steep and narrow escarpments develop along the eastern margin of the Korean Peninsula. They are compartments of a passive continental margin and thus have been considered tectonically stable. In contrast to the traditional notion, geomorphic markers indicative of the enhanced tectonic uplift since the Late Quaternary (i.e., coastal terraces at several different altitudes) have been observed along the eastern coastal areas of the peninsula. Therefore, the steep escarpments in the eastern margin are assumed to be tectonically reactivated. However, the spatial magnitude and timing of the reactivation and how the escarpments have responded to the reactivation have not been well studied. Knickzone is a typical geomorphic marker, which has long been utilized for deciphering the history and distribution of tectonics. Here, we examined the knickzones of the marginal escarpments, where transient knickzones are likely to be observed, in order to understand the spatial pattern of the Late Quaternary reactivation and its effects on the evolution of the marginal escarpments. We used SRTM 1 arc-second DEMs, satellite images with fine resolution, and geological maps to identify and classify knickzones. We also conducted field surveys for the verification of the identified knickzones. As a result of the knickzone analysis, 46 knickzones were identified in the study catchments. Their mean length and gradient are 461 m and 0.19 m/m, respectively. Most knickzones are at relatively high altitudes (i.e., median elevation 532 m) and thus are placed far from the coast. According to the classification of the identified knickzones, they are formed mainly due to varying rock types (11) or changes in lithologic features of the same rock type (e.g., weathering degree of rocks) (31). Few of them are associated with the accumulation of coarse sediments at a channel junction (3) and meander neck cut-off (1). This result implies that all identified knickzones in the study catchments are stationary rather than transient. Consequently, it postulates that the Late Quaternary tectonic forcing was insufficient to generate any transient knickzone. Otherwise, potential transient knickzones due to the reactivation might have disappeared rapidly during their upstream migration, which seems highly relevant to the high concavity of the stream profiles in the drainage basins of the escarpments. Additionally, the result suggests that transient knickzone is not a good indicator for interpreting the responses of the marginal escarpments to the reactivation during the Late Quaternary.</p>

Classification of worldwide drainage basins through the multivariate analysis of variables controlling their hydrosedimentary response

2011 ◽  
Vol 76 (3-4) ◽  
pp. 117-127 ◽  
Author(s):  
Julie Raux ◽  
Yoann Copard ◽  
Benoît Laignel ◽  
Matthieu Fournier ◽  
Nicolas Masseï
Keyword(s):  
Multivariate Analysis ◽  
Drainage Basins
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