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
Bangladesh ; Bank erosion ; Fluvial processes ; Longitudinal section ; Mathematical model ; Meander ; Model ; River bed ; Simulation ; Stream
The A. discusses a two-dimensional depth-averaged model, various meander models and a model for the braided Brahmaputra-Jamuna River in Bangladesh. Emphasis is placed on the need for future research rather than on model applications. The models help
This paper assesses the utility of statistical models by examining methodological issues associated with empirical analysis of hydraulic and channel geometry relationships. It also describes and presents examples of advanced statistical models
Un modèle d'acquisition des substances dissoutes et particulaires des eaux fluviatiles d'un milieu continental cristallin à travers l'exemple du Chari (Tchad)
Channel geometry ; China ; Discharge ; Experimentation ; Fluvial dynamics ; Fluvial erosion ; Fluvial processes ; Human impact ; Model ; Simulation ; Watershed
As a branch of geomorphology, the fluvial dynamic geomorphology is a marginal science among fluid dynamics, sediment mechanics and fluvial geomorphology. With physical modelling by similarity based on Newtonian mechanics, and principle of the same
L'épaisseur des sédiments et les taux de sédimentation au cours de la progression du delta peuvent être prédits à l'aide d'un modèle mathématique. Lorsque la progression est uniforme et que les caractéristiques fluviatiles sont semblables à celles
du nord du Golfe du Mexique le modèle prédit une augmentation du taux de sédimentation en un point fixé, tant que la sédimentation sur la pente deltaïque continue.
Datation ; Dépôt de pente ; Fluviatile ; Glaciaire ; Géographie de l'Asie ; Géomorphogenèse ; Hokkaido ; Japon ; Mouvement de masse ; Oscillation climatique ; Périglaciaire ; Quaternaire ; Quaternaire morphologie ; Terrasse fluviatile ; Terrasse
La succession des processus géomorphologiques associée aux variations climatiques du début du Quaternaire est étudiée à travers ses effets sur la plaine de Tokachi: chronologie des modelés glaciaires, terrasses marines, terrasses fluviatiles
, phénomènes périglaciaires fossiles, mouvements de masse sur les versants. Ces données disponibles sont mises en relation avec des analyses des dépôts de terrasse et de pentes, des sédiments fluviatiles. Datation et chronologie des terrasses fluviatiles et
This paper briefly describes a model of the erosional development of catchments and their channel networks. The model differentiates between the dominant transport processes in hillslope and channels. The development of channels and hillslopes
Terrasse fluviatile comme objet de la nature. Etage véritable de terrasse fluviatile. Escarpement fluviatile. Concept de terrasse fluviatile. Indice morphographique de vallée fluviatile. Déformations des terrasses fluviatiles. Détermination de la
Devon ; Earth surface processes ; England ; Floodplain ; Flow ; Fluvial hydrology ; Fluvial processes ; Model ; United Kingdom
A prototype two-dimensional finite element flow model for depth-averaged free surface flows is developed for floodplain environments. Preliminary model results indicate that this modelling approach can be used to identify dynamic variations
Bibliography ; Earth surface processes ; Fluvial erosion ; Model ; Numerical model ; Slope dynamics ; Tectonics ; Topography
This review summarizes and evaluates the important issues concerning numerical surface process models (SPMs) of long-term landscape evolution that have been addressed only in a passing way by previous authors. The issues reviewed here
are : the formulation of the laws that represent fluvial and hillslope processes in SPMs; the implementation of the various algorithms on numerical grids; model parameterization; and model testing.
In this work the AA. present a numerical framework for simulation of surface processes and landforms. The model is called SIGNUM (Simple Integrated Geomorphological NUmerical Model) and is a Matlab, TIN-based landscape evolution model. The AA. use
the model to show a few examples of simulated topographic surfaces evolved through application of mathematical expressions for hillslope and fluvial erosion, channel sediment transport and surface uplift. Although work in the field of computer simulation
of geomorphological processes of landscape evolution is at its beginning, results and insights from models are gaining more and more attention in the scientific community, justifying and encouraging increasing research efforts. - (NF)
A partir de l'étude géomorphologique et sédimentaire, on différencie trois terrasses souterraines correlées à d'autres dépôts fluviatiles épigéniques (no Cànyoles). Interprétation paléoclimatique des données polliniques et de deux datations au
Flood ; Floodplain ; Fluvial processes ; Grain size distribution;Granulometry ; Model ; Numerical model ; Sedimentology ; Statistics ; United Kingdom ; Wales
to the Severn flood are used as input for a computer program of James' (1985) model. The pattern of sediment concentrations predicted by the model was compared with that obtained from statistical analysis of the flood sediment.
Arizona ; Erosion ; Fluvial processes ; Fractal geometry ; Model ; Numerical model ; Topography ; United States
The A. develops a three-dimensional numerical model of fluvial landsculpting operative over large periods of time and large spatial scales. The model is based on simple approximations intended to capture the synoptic effects of fluvial processes
. Experiments with the model also offer tentative insight into how climatic and tectonic variables affect the evolqution of landscapes. The results of the model also relate to the complexity of natural landscape and its description through the language