Adduction d'eau ; Aménagement hydraulique ; Arizona ; California ; California State Water Project ; Central Arizona Project ; ColoradoRiverProject ; Colorado, bassin ; Conflit ; Culture irriguée ; Economie de l'eau ; Etats-Unis ; Gestion de l'eau
Conflits entre les états de Californie et de l'Arizona sur l'utilisation des eaux du Colorado inférieur. Les projets d'aménagement hydraulique et d'adduction pour résoudre le problème de la rareté des ressources en eau dans le sud-ouest des Etats
Controls on at-a-station hydraulic geometry in steep headwater streams, Colorado, USA
Channel geometry ; Colorado ; Experimental catchment ; Grain size distribution ; Principal components analysis ; River bed ; Roughness ; Step-pool channel ; Stream ; United States of America
Analyse en composantes principales ; Bassin expérimental ; Cascade ; Chenal seuil-fosse ; Colorado ; Cours d'eau ; Etats-Unis ; Granulométrie ; Géométrie hydraulique ; Lit fluvial ; Rugosité
Análisis en componentes principales ; Cauce ; Colorado ; Corriente de agua ; Cuenca experimental ; Estados Unidos ; Geometria hidráulica ; Granulometría ; Rugosidad
Detailed hydraulic measurements were made in nine step-pool, five cascade and one plane-bed reach in Fraser Experimental Forest, Colorado to better understand at-a-station hydraulic geometry (AHG) relations in these channel types. A principal
component analysis (PCA) was used to compare the combined variations in all three exponents against five potential control variables: wood, D84, grain-size distribution (σ), coefficient of variation of pool volume, average roughness-area (projected wetted
[b1] Dep. of Geosciences, Colorado State Univ., Fort Collins, Etats-Unis
[b2] Dep. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, Etats-Unis
Colorado ; Cultural identity ; Landscape ; Leisure ; Mountain ; Semiotics of space ; United States of America
As certain mountains such as the San Juan Mountains in southwestern Colorado are imbued with meaning, they become peaks of identity, symbolic landscapes associated with community and cultural ideals. For communities near the San Juans
, they symbolize idealized natural scenery, landmarks of home, recreation opportunities, and spiritual renewal. The symbolism is projected mainly through the display of icons and names on signs and government seals. - (SLD)
Amerindians ; Arizona ; Conflict ; Dam ; Irrigation ; Legislation ; Planning project ; Resource management ; River basin ; United States of America ; Water resources
qu'administrateur des biens des Indiens a été critiqué. De tels accords sont des jalons vers l'exploitation des bassins fluviaux à moyen et long terme (comme celui de la Gila River dans le bassin de la ColoradoRiver). A côté de la sécurité juridique, une sécurité
En prenant l'exmple de l'Arizona et de l'Active Management Area de Phoenix, l'A. présente deux accords indiens sur le régime juridique des cours d'eau, celui des Indiens Pima-Aricopa de la Salt River et celui des Indiens Apache-Mohave du Fort Mc
Dowell. Il présente aussi les revendications juridiques sur les eaux de la Gila River par les Indiens dans le contexte des tensions entre les législations fédérales et locales. Le rôle historique malencontreux du gouvernement fédéral en tant
Sedimentatieverschijnselen nabij een rivier stuw op de Markrivier Sedimentation phenomena near a river dam on the river Mark
To alter the natural river behaviour, many regulation projects have been carried out on various river systems. However, until now very few studies on the reactions of the rivers to the imposed regulating systems have been undertaken. - (Author).
Description of an interdisciplinary science project that includes a geographical dimension. Students from two different schools and very diverse backgrounds grow crops together in a vacant lot in Denver, Colorado. - (DWG)
Silenced rivers: the ecology and politics of large dams
Dam ; Environment ; Hydraulic works ; Impact study ; Political geography ; Project
Devastating critique of the environmental effects and human consequences of dams around the world. Considers the powerful political and economic interests behing large dam projects, many proposed and built for large international aid projects
Data from a lake sediment core was used to reconstruct changes in vegetation and fire frequencies over the last 7000 cal yr : Bear Lake is a high-elevation lake surrounded by subalpine vegetation in Rocky Mountain National Park, Colorado. The pollen
data and the results of macroscopic charcoal analyses are presented and discussed. It is concluded that fire activity is likely to increase under current Intergovernmental Panel on Climate Change climate projections of an increase in annual temperatures.
[b2] Dep. of Geography, Univ. of northern Colorado, Greeley, Etats-Unis
Researches on environmental changes of the Yellow River Basin and laws of water and sediment transportation
In this project, some basic researches on the prospect of reducing sediments delivered into the Yellow River after 2000, the ways to prolonging the lifetime of the current lower Yellow River channel, the program of comprehensive management
and development of the drainage basin, etc., were carried out. Moreover, this project has outstanding features comparing with other researches on the large rivers in China.
Morphogenetic classification of river valleys developing in formerly glaciated areas for the needs of mathematical and physical modelling in hydrotechnical projects
Applied hydrology ; Catchment area;Watershed ; Classification ; Fluvial erosion ; Fluvial processes ; Human impact ; Hydrological regime ; Meander ; Model ; Poland ; River bed
This paper deals with proposals of natural models of river valley evolution useful for physical and mathematical modelling in hydrotechnical projects. Such models are known from investigations of numerous valley reaches of the Wisla (Vistula) River
and the Odra (Oder) River drainage basins. The proposed classification of model types forms an open system that can be supplemented with new types and subtypes, characteristic for other regions of the world.
This paper presents a framework and blueprint for geomorphic studies of large rivers developed in the course of basic, strategic and project-related investigations of a number of large rivers. The framework demonstrates the need to begin geomorphic
studies early in the pre-feasibility stage of a riverproject and carry them through to implementation and post-project appraisal. The blueprint breaks down the multi-layered and multi-scaled complexity of a comprehensive geomorphic study into a number
projects but also of anxieties about governance and rule; to see their inhabitants not only as abject recipients of aid, but also as individuals who make decisions and choices in complex conditions. They conclude that while the outcome of projects within
such spaces is often unpredictable, the assumptions that undergird such projects create regular cycles of implementation and failure.
[b1] Dept. of Geography, Univ. of Colorado, Boulder, Etats-Unis
Using case material and ethnographic vignettes from a larger geographic project on water rights and governance in New Mexico. Water adjudication is examined as a vital instrument in the state's pursuit of spatial knowledge. The A. explores how
[b1] Hulbert Center, Southwest Studies, Colorado College, Colorado Springs, Etats-Unis
Deux scénarios de changement climatique induit par le CO-2 et des projections démographiques et de consommation de l'eau en 2035 sont utilisés dans cette étude sur les ressources en eau futures dans le bassin des Grands Lacs américains. Comparaison
avec une étude similaire menée sur le bassin du Colorado.
The character of the fine fractions of the bottom sediments of the Bohemian part of the Labe (Elbe) river
Part of the project to study the distribution and transport of pollutants in the Bohemian part of the Labe river involved the determination of the mineral association in recent sediments, the grain-size distribution and expression of the effect
of the river catchment geological setting, of its relief and of weathering on the composition of the particulate bed material. As it is generally accepted that the smaller grain-size of the sediment fraction binds the greatest amount of trace toxic elements