A conceptualmodel for meander initiation in bedload-dominated streams
Bank erosion ; Channel geometry ; Conceptualmodel ; Meander ; Model ; Sediment transport ; Stream
Cours d'eau ; Erosion des berges ; Géométrie hydraulique ; Modèle ; Modèle conceptuel ; Méandre ; Transport sédimentaire
A simple analytic model is presented relating local sediment transport capacity to variance in the transverse shear stress distribution in a stream channel. The model is used to develop a physically based conceptualmodel for the initiation
supply is required to proceed from the conceptual framework to quantitative measurements of erosion. However, this conceptualmodel solves the apparent paradox of the sediment delivery ratio, resolves recent discussion about the validity of erosion rates
Un modèle conceptuel analytique relativement simple décrit de façon très réaliste le développement non linéaire des perturbations extratropicales, quelle qu'en soit l'intensité, jusqu'à leur stade de maturité. - (JPB)
Conceptualmodel of sediment processes in the upper Yuba River watershed, Sierra Nevada, CA
California ; Conceptualmodel ; Erosion rate ; Geographical information system ; Mass movement ; Slope dynamics ; United States of America ; Watershed
Bassin-versant ; California ; Dynamique de versant ; Etats-Unis ; Modèle conceptuel ; Mouvement de masse ; Système d'information géographique ; Vitesse d'érosion
The conceptualmodel illustrates key processes controlling sediment dynamics in the upper Yuba River watershed and was tested and revised using field measurements, aerial photography, and low elevation videography. Finally, the AA. propose
that spatially distributing the components of a conceptualmodel in a GIS framework provides a guide for developing more detailed sediment budgets or numerical models making it an inexpensive way to develop a roadmap for understanding sediment dynamics
A new conceptualmodel for understanding geographical variations in weathering
Argile minéral ; Climat ; Concept ; Domaine aride ; Désert ; Eau du sol ; Géomorphologie climatique ; Microstructure ; Modèle ; Météorisation ; Périglaciaire ; Sol
Arid area ; Clay mineral ; Climate ; Climatic geomorphology ; Concept ; Desert ; Microstructure ; Model ; Periglacial features ; Soil ; Soil water ; Weathering
This paper presents a new conceptualmodel of geographical variability in chemical weathering and compares this model with the climatic theory of weathering. The evaluation progresses systematically from micro- to mesoscales, from the hygroscopic
Conceptualmodels of convective weather in the Netherlands
Circulation atmosphérique ; Convection ; Dynamique de l'atmosphère ; Modèle ; Pays-Bas ; Type de temps
Atmospheric circulation ; Atmospheric dynamics ; Convection ; Model ; Netherlands (The) ; Weather type
Cinq modèles conceptuels ont été mis au point pour reproduire les principaux types de temps impliquant une forte activité convective. Ils font intervenir le régime météorologique (type de circulation), la température potentielle du thermomètre
A model of till emplacement based on the catastrophic alteration of hydrological conditions across the Precambrian/Paleozoic boundary is proposed. This model accords closely with the available field evidence. It highlights the significance
Aeolian features ; Erosion rate ; Experimentation ; Model ; Soil erosion ; United Kingdom ; Wind ; Wind erosion
This paper presents a conceptualmodel of wind erosion by saltating grains in which the erosion rate is determined by the strength of the surface and the energy delivered to the surface by the saltating grains. Methods are presented
Towards the integration of subsurface flow and overland flow in gully head extension : issues from a conceptualmodel for gully erosion evolution
Brésil ; Concept ; Erosion des sols ; Modèle ; Pente de versant ; Ravinement ; Ruissellement ; São Paulo ; Vitesse d'érosion
Brazil ; Concept ; Erosion rate ; Gully erosion ; Model ; Rill wash ; Slope gradient ; Soil erosion ; São Paulo
A conceptualmodel for gully erosion evolution conceives that, on the same hillslope, erosive incisions connected and disconnected to the main drainage net may integrate into a unique channel. At the moment of the integration, the synergies
Biogenic process ; Concept ; Ecology ; Lichen ; Lithology ; Micro-organism ; Model ; Weathering
surface community, and thus the style of biological weathering. A simple, preliminary conceptualmodel can be drawn, which relates biological weathering activity to an environmental stress gradient and which is applicable at a range of scales.
The climatology of surface ozone in rural areas : a conceptualmodel
Action anthropique ; Climatologie ; Dynamique de l'atmosphère ; Environnement ; Espace rural ; Géographie physique ; Modèle ; Ozone ; Pollution ; Type de temps
in synoptic high pressure systems, but also subsynoptic local effects at the mesoscale. A conceptualmodel of the formation and transport of surface ozone in rural areas is presented, with a brief discussion of promising research approaches and techniques.
Large, infrequent fires (LIFs) can have substantial impacts on both ecosystems and the economy. The AA. review local and regional literature investigating the factors that produce the LIFs. The emerging conceptualmodel proposes that ecosystems can
associated with 3 approaches to the study of landscape modelling : conceptual, quasi-mechanistic and general physics, are reviewed.
The AA. review elements of a structured approach to model development and testing. It is argued that natural breaks in landscape process and morphology define appropriate spatial domains for the study of landscape evolution. The concept of virtual
velocity is used to define appropriate timescales for the study of landscape change. Issues relevant to model implementation, including validation, verification, calibration and confirmation, are discussed. Finally, key developments and characteristics
An exploratory approach to coarse clastic barrier development is based on a conceptual outline of shoreline processes around drumlin islands and likely interaction among them. The case study is the eroding drumlin archipelago at Clew Bay, western
Automatic calibration of conceptual rainfall-runoff models: the question of parameter observability and uniqueness
Etude des raisons de l'impossibilité d'obtenir des ensembles de paramètres uniques et conceptuellement réalistes pour des modèles de la relation pluie-débit.
This progress report addresses virtual species distribution models : the use of spatially explicit simulated data to represent a true species distribution in order to evaluate aspects of modelconceptualization and implementation. Simulating a true
species distribution, or a virtual species distribution, and systematically testing how these aspects affect SDMs, can provide an important baseline and generate new insights into how these issues affect model outcomes.
Object-oriented modeling in regional science: an advocacy view
Agrégation ; Choix de l'habitat ; Classification ; Comportement des ménages ; Modèle ; Modélisation ; Programmation ; Science régionale ; Simulation ; Système de production
Aggregation ; Classification ; Household behaviour ; Model ; Modelling ; Production system ; Programming ; Regional science ; Residential choice ; Simulation
Among innovative conceptual approaches, object orientation has a high potential for modeling in fields where simulation can play an important role. Programming languages and graphical software tools supporting object-oriented modeling are beginning
to dominate. The three-pronged development of conceptual approach enhances the ability to model and understand the behavior of increasingly complex socioeconomic systems.