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
Modelling water erosion and the impact of water repellency
Dune ; Erosion des sols ; Géographie physique ; Humidité du sol ; Littoral ; Modèle ; Pays-Bas ; Perméabilité ; Précipitation ; Ruissellement
Three years of weekly measurements of surface runoff and sediment yield from two small plots in a dune terrain along the Dutch coast have been used to model water erosion. This paper tries to establish simple estimates of sediment yield as well
In this paper the double Fourier series technique is used to model two doline and two cockpit karst landscapes in northern Jamaica. This is done : 1) to see how well these karst terrains can be approximated by a series of wave surfaces, 2) to assess
the degree of organization within these complex landscapes in terms of the forms of the principal waves needed to model them, and 3) to assess the potential of the method to differentiate between karst styles by determining if the properties of the waves used
to model doline karst differ significantly from those used to model cockpit karst.
A model has been built to simulate runoff and erosion on slopes of varying form with soil of varying hydraulic conductivity, porosity, storage capacity, and particle size distribution. The model takes into account spatially dependent random
Un modèle d'optimisation des pluies pour les oliveraies
Agroclimatologie ; Bilan hydrique ; Cycle de l'eau ; Domaine aride ; Domaine semi-aride ; Eau du sol ; Evapotranspiration ; Géographie physique ; Hydrologie ; Modèle ; Oliveraie ; Optimisation ; Précipitation ; Sahel tunisien ; Sol ; Système
Présentation du système hydrologique Meskat traditionnellement utilisé dans le Sahel tunisien pour la conservation des eaux et du sol des oliveraies. Puis description d'un modèle informatique qui permet d'intégrer les facteurs agroclimatiques et
The main objective in this work has been to develop load models/load diagrams for coastal areas where the environmental effect of nutrient discharges in general, and from fish farms in particular, can be related to the dose of nutrients (nitrogen
GIS techniques and statistical models in evaluating landslide hazard
From a small drainage basin located in Central Italy, relevant geological and geomorphological factors were collected and processed by applying GIS technology. In particular, modules were used which both generate high-fidelity digital terrain models
Small-scale hydraulic laboratory models based on Froude modelling criteria were used to investigate : 1) the influence of gradient and discharge on the average cross-sectional geometry and channel pattern of braided streams| b) the temporal
Coulée de blocs ; Dynamique de versant ; Granulométrie ; Géographie physique ; Modèle ; Mécanique des roches ; Rhéologie ; Versant
This paper outlines an investigation of the rheological behaviour of field debris flow materials using a newly designed and constructed 30o inverted cone-and-plate rheometer. A small 1 :5 scale model was also constructed and was used to test a wide
variety of artificial fluids and grain-fluid mixes. The model was also used to test fine-grained debris flow materials, and these results are reported here.
Two approaches to modelling surface erosion are described which can be used to explain the development of geomorphological features. The first approach uses non-linear wave theory and shows how surface gradient discontinuities can arise
A general circulation model (GCM) of the ocean is used to study the effects of changes in the monsoon winds of present day and 9 000 yr B.P. on the upwelling in the Arabian Sea. The vertical transport from the ocean GCM is used as a measure
The present paper uses results from a Froude scale laboratory model in consideration of the relationship between bedload transport rates measured at a single cross-section and channel morphology measured at two scales. The first scale
The mathematical model of Raleigh convection on the rotating Earth in deep-water ocean depression is generalized for the case including the meridional temperature gradient. Critical parameters determining the convection are calculated for the Kuril
Alternate bars were formed by sediment transport in a flume with Froude-modelled flow and relative roughness characteristic of gravel-boulder channels with steep slopes. This paper describes the experiment and present arguments that steep channel
This paper discusses observations of burrowing activity over a one-year monitoring period at a site in coastal central California, presents models for quantifying the resulting sediment transport, and compares the results to both previous