Géographie physique ; Modèle ; Modèle mathématique ; Permafrost ; Périglaciaire ; Température ; Thermokarst ; URSS ; Zone froide
of thermokarst are analyzed. In this paper the mathematicalmodels of these problems, computer programs for the models and some numerical calculations for concrete objects and districts are suggested.
A review of fundamental new results in mathematical theory of geocryological problems obtained in the Institute of Mechanics in Moscow State University. The problems of temperature regime and phase state of permafrost, formation and evolution
The study of complexity-some ideas from mathematicalmodelling in Climatological extremes in the mountains, Physical background, geomorphological and ecological consequences.
Analyse de système ; Généralités sur la géographie ; Modèle mathématique ; Système ; Théorie
One of the simple lessons from mathematicalmodelling is that complex behaviour need not have a complex cause. The A. tries to demonstrate this point by elaborating on some of these novel mathematical ideas, described under the headings catastrophes
In this paper the nature, state and variability of the climate system are described briefly. Of particular importance in open systems such as components of the climatic system is feedback. Mathematicalmodels provide a new way to not only understand
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
. Two major groups emerge : deterministic mathematical and artificial neural network models.
Modelling of cyanobacteria in freshwaters is an important tool for understanding their population dynamics and predicting bloom occurence in lakes and rivers. In this paper existing key models of cyanobacteria are reviewed, evaluated and classified
Choice of mathematicalmodels in geographic research considering alternatives.
This Ph. D. thesis is a first attempt to explore the gap between mathematics and geography. The human geographer or social scientist usually speaks a different language than the mathematician. Concepts such as entropy, diffusion and allometry play
a great role in this study. The idea that various alternatives should be compared before making a choice of a model forms a critical theme. - (AGD)
Agropédologie ; Conservation des sols ; Erosion des sols ; Modèle ; Modèle mathématique ; Pente de versant ; Propriété du sol ; Précipitation ; Simulation de pluie
The soil erosion model presented in this paper is based predominantly on general physical principles. The model parameters are related directly to measurable soil, slope and rainfall properties. Both the erosion and the deposition of the soil
Short summary of the theoretical considerations behind the model, a presentation of background data from the Cachí reservoir, and an application of the model on the Cachí reservoir. Thus the results are based on a theoretical model that is adapted
The article presents methodological concepts and definitions as regards different scales, as well as their magnitudes in relation to the study and modelling of geoecosystems. The particular subject being considered is the geoecosystem
The model allows to estimate the time and the position of forming of the depth hoar strates and allows to calculate the snow strength in different layers of snowpack and the variation of snow strength in the process of metamorphism. The suggested
thermomechanical model of the snowpack structure formation allows to decide the important problem of the avalanche alarm prognosis with using of the experimental meteo-data from the snow-avalanches station.
Evaluation, by a simulation with mathematicalmodels of physical phenomena, of the impact of the foreseen maximum winning of sand and gravel on the coastal ecosystem. The present official authorizations for winning operations are valid 3 years
A mathematicalmodel of segregation patterns in residential neighbourhoods
Housing market ; Mathematics ; Model ; Segregation ; Social group ; Urban district
Groupe social ; Marché du logement ; Mathématique ; Modèle ; Quartier ; Ségrégation
Les AA. proposent un modèle mathématique qui décrit la dynamique et les distributions spatiales de deux groupes de populations, où la migration est impulsée par le statut socio-économique. La ségrégation est associée à des instabilités par rapport à