Minimum Froude number and the equilibrium of alluvial sand rivers
Computer simulations for sand bed rivers show that the Froude number of the flow tends to a minimum value when the equilibrium river tends to a certain hydraulic geometry. Evidence from 57 alluvial sand material rivers and stable canals shows
Discrimination of alluvial and mixed bedrock–alluvial multichannel river networks
América del Norte ; Asia ; Bifurcación ; Canal anastomosado ; Corriente de agua ; Estudio comparativo ; Geometria hidráulica ; India ; Meandro ; Red de drenaje ; Río Ganges ; África del Sur
This paper explores the use of planview morphological metrics to quantitatively describe and distinguish mixed bedrock–alluvial multichannel networks from alluvial multichannel networks. The geometries of the channel planforms of 2 bedrock
-constrained networks (Mekong and Orange rivers) are compared with the classic alluvial anastomosed Upper Columbia River and the wandering Ganga River. Widely recognized indices utilized include : channel link count and channel sinuosity, and less common
convexity clearly discriminates the 2 alluvial rivers from the 2 bedrock-influenced rivers. The width of the macrochannel, in which each network develops, has a positive influence on the number of channel links and is further related to channel slope
Assessing human impact on alluvial fan development : a multidisciplinary case-study from Lower Khuzestan (SW Iran)
Alluvial cone ; Archaeology ; Digital elevation model ; Geoarchaeology ; Geomorphological map ; Human impact ; Human occupation ; Iran ; Irrigation ; Khuzestan ; Remote sensing
This paper presents a multidisciplinary approach for studying the evolution of an alluvial fan system in Lower Khuzestan (SW Iran). The study draws on previously collected data from geological and archaeological field campaigns and new data derived
from the interpretation of satellite imagery and historical textual sources. Three alluvial fans were identified, successively deposited by the Jarrahi river. Judging from archaeological and historical evidence, the successive phases appear to coincide
canals, human activity also played an important role in the formation of the earlier fans.
The particle size of the bed sediments in or on many natural streams, alluvial fans, laboratory flumes, irrigation canals and mine waste deltas varies exponentially with distance along the stream. A plot of the available worldwide exponential bed
Channelization of the Mississippi river and its influence on Louisiana's alluvial wetlands in Actes. Excursion-Symposium n 9. La Côte atlantique du bassin d'Arcachon à l'estuaire de la Loire. L'impact des aménagements sur son évolution.
La régularisation du bas-Mississippi ainsi que les canaux créés pour l'exploitation du pétrole font disparaître plus de 100 km de marais maritime par an.
Comprised of embanked fields and canals, the bordo system played a major role in land use patterns, water rights and agricultural systems in the high-altitude alluvial valleys north of Mexico City. - (DWG)
River bifurcations are critical but poorly understood elements of many geomorphological systems. They are integral elements of alluvial fans, braided rivers, fluvial lowland plains, and deltas and control the partitioning of water and sediment
Acción antrópica ; Canalaluvial ; Corriente de agua ; Datación Carbono 14 ; Diagrama polínico ; Dinámica fluvial ; Estratigrafía ; Francia ; Francia del Este ; Geocronología ; Holoceno ; Llanura aluvial ; Ocupación humana ; Paleoambiente
Action anthropique ; Chenal alluvial ; Cours d'eau ; Datation C 14 ; Diagramme pollinique ; Dynamique fluviale ; France ; France de l'Est ; Géochronologie ; Holocène ; Occupation humaine ; Palynologie ; Paléo-environnement ; Plaine alluviale ; Saône
Alluvial channel ; Alluvial plain ; Archeological site ; C 14 dating ; Eastern France ; Fluvial dynamics ; France ; Geochronology ; Holocene ; Human impact ; Human occupation ; Lateglacial ; Palaeo-environment ; Palynology ; Pollen diagram ; Saône
Canalaluvial ; Capacidad de carga ; Caudal ; Corriente de agua ; Crecida ; Erosión de las riberas ; Fotografía aérea ; Fotointerpretación ; Geometria hidráulica ; Grava ; Sistema de información geográfica ; Transporte sedimentario ; Trazador
Capacité de charge ; Chenal alluvial ; Cours d'eau ; Crue ; Débit ; Erosion des berges ; Friuli-Venezia Giulia ; Gravier ; Géométrie hydraulique ; Italie ; Photo-interprétation ; Photographie aérienne ; Système d'information géographique ; Traceur
Aerial photography ; Alluvial channel ; Bank erosion ; Carrying capacity ; Channel geometry ; Discharge ; Flood ; Friuli-Venezia Giulia ; Geographical information system ; Gravel ; Italy ; Photointerpretation ; Sediment transport ; Stream ; Tracer
Discrimination of channel patterns for alluvial rivers based on the sediment concentration to water discharge ratio
Análisis discriminante ; Canal anastomosado ; Cauce ; Caudal ; Corriente de agua ; Geometria hidráulica ; Meandro ; Modelo
Based on data from 107 Chinese alluvial rivers, a study has been made to relate river channel patterns to the water discharge ratio (ζ) index. These rivers can be classified as four channel patterns, i. e., braided, low concentration meandering
l'identification des nappes alluviales et des canaux anciens peut s'appuyer sur les images satellitaires et préférentiellement sur celles de SPOT 2. - (H.N.).
The natural fluvial processes are disturbed by human activities - embankment, dams, weirs, etc. The research area is situated in Southern Moravia, in the wide alluvial plain, gently undulated river channel. It is characterized by numerous cut-off
meanders and oxbow lakes, Aeolian mounds and number of irrigating canals. A lot of maps and photographs are used since the second Military mapping 1827-1830. - (MS)
Lithology, through its influence on sediment production, may have an important effect on the size of alluvial fans and, hence, on fan-basin morphometric relations. The purpose of this study is to evaluate the influence of lithologic erodibility
on the relation between alluvial fan area and drainage basin area.
Alluvial cone ; Fluvial processes ; Hydrology ; Mathematical model ; Model ; Sedimentology
A mathematical model which estimates the scale-independent sediment surface profile of alluvial fans has been developed. This model utilizes a diffusive sediment transport model and an unsteady, radial flow, conservation relationship. The model
suggests that the overall dimensionless morphology of alluvial fans is governed more by fundamental diffusion principles in sediment deposition than by individual environmental or basin characteristics. A preliminary comparison indicates that this model
provides useful qualitative and quantitative information relating to alluvial fan process and morphology.
karst area two types of alluvial fans appear on carbonate bedrock. Members of the first type are ordinary alluvial fans with active alluvial processes where flysch derived sediment covered limestone surface in a distinct fan shape. - (L'A.).
In studying alluvial deposits from the Torre del Loro Beach near Huelva, southwestern Spain, it has been possible to describe not only processes and morphology of alluvial fans, but to track evolutionary changes in the morphology of the alluvial