Assessing transformation and sustainability in the GreatLakesBasin
Canada ; Ecosystème ; Environnement ; Gestion de l'environnement ; GreatLakesbassin ; Géographie humaine ; Modèle ; Qualité de l'eau ; Utilisation du sol
The purpose of this paper is to apply the sociobiophysical evolution model (Grzybowski 1986| Grzybowski, Slocombe 1988) to the GreatLakesBasin and to explore its implications for management of the Basin.
Highest pluvial-lake shorelines and Pleistocene climate of the Western GreatBasin
Climatic variation ; Drainage network ; Lake ; Lake level ; Nevada ; Palaeo-environment ; Pleistocene ; Tectonics ; United States of America
Shoreline altitudes of several pluvial lakes in the western GreatBasin of North America record successively smaller lakes from the early to the late Pleistocene. This decrease in lake size indicates a long-term drying trend in the regional climate
that is not seen in global marine oxygen-isotope records. The previously unknown lake levels also reflect significant changes in tectonics, and (or) drainage-basin configurations, and could have facilitated migration of aquatic species in the GreatBasin.
The Mormon experience : the plains as Sinai, the Great Salt Lake as the Dead Sea, and the GreatBasin as desert-cum-promised land
The experiences of the members of the Church of Jesus Christ of Latter-day Saints in migrating across the Great Plains to the valley of the Great Salt Lake, in colonizing the Wasatch oasis, and in occupying major portions of the GreatBasin gave
Geomorphology applied to flooding problems of closed-basinlakes...specifically Great Salt Lake, Utah
Climatic variation ; Earthquake ; Human impact ; Inundation ; Lake ; Lake level ; Natural hazards ; Regional planning ; United States ; Utah ; Wind
This paper reports on how geomorphic evidence has contributed to an understanding and definition of flooding hazards associated with closed-basinlakes in the GreatBasin of the western United States and specifically with the largest of these lakes
, Utah's Great Salt Lake. The understanding of past lake fluctuations based on geomorphic and historic evidence and the knowledge of effects of wind and earthquakes on lakes provide sufficient information to be used in estimating flooding risks associated
Des modèles de facteurs contrôlant les fluctuations du niveau d'un lac pluvial du Pléistocène supérieur dans le Grand Bassin sont évalués en datant les niveaux lacustres dans la Jakes Valley.
Changing properties of snowpack in the Great Salt Lakebasin, western United States, from a 26-year SNOTEL record
Années 1982-2007 ; Bassin-versant ; Donnée climatique ; Etats-Unis ; Great Salt Lake ; Lac ; Manteau nival ; Montagne ; Neige ; Ressource en eau ; Salinité ; Utah
Climatic data ; Lake ; Mountain ; Salinity ; Snow ; Snow cover ; United States of America ; Utah ; Water resources ; Watershed
Daily observations from automated snowpack telemetry (SNOTEL) stations from within the drainage basin of the Great Salt Lake over the period from 1982 to 2007 are analyzed. The major finding is a shift toward an earlier date of peak snow water
equivalent (SWE) by around 15 days. This suggests increased chances of late-summer water shortages especially when combined with rapid recent population growth. Less freshwater is likely to be available to flow into the Great Salt Lake, increasing its
Salt dissolution features in saline lakes of the northern Great Plains, western Canada
Alberta ; Canada ; Carbonate dissolution ; Evaporite ; Lacustrine sediment ; Lake ; Manitoba ; Palaeo-environment ; Quaternary ; Salt lake ; Saskatchewan
Large-scale salt dissolution is an important process affecting the sediments of many of the saline lakes in the northern Great Plains region of western Canada. The most easily recognized features of this salt karst are water-filled chimneys
, vertical shafts, and collapse structures. Because these salt karst features can affect large vertical sections of the sediment fill in the lakes, their recognition is of fundamental importance in attempting to use the stratigraphic records of the basins
A revised chronology for the last Pleistocene lake cycle in the central Lahontan basin
Amérique du Nord ; Datation radiocarbone ; Domaine aride ; Etats-Unis ; GreatBasin ; Géographie de l'Amérique ; Lac ; Lake Lahontan ; Niveau lacustre ; Paléohydrologie ; Pléistocène supérieur ; Quaternaire zones moyennes
Radiocarbon dates of plant materials from packrat middens, in conjunction with radiocarbon dates of archaeological materials, provide evidence that the last high stand of Pleistocene Lake Lahontan terminated before 12,070 yr B. P. This new
information suggests that the last major fluctuation in the level of Lake Lahontan was approximately synchronous with those of Lakes Bonneville and Russel, and that these three lakes probably responded contemporaneously to the same regional paleoclimatic
Paleomagnetic investigation of lake Lahontan sediments and its application for dating pluvial events in the Northwestern GreatBasin
A comparison of paleomagnetic secular variation in sediment of Pleistocene Lake lahontan in the northwestern Greatbasin with secular variation in lake sediment in the Mono Basin, California, indicates that Lake Lahontan was in the valley
of the Truckee River between Pyramid Lake and Wadsworth, Nevada, from about 19,000 to 13,000 yr B.P. On the basis of field mapping and tephrochronology, the sections of older lacustrine sediments are not coeval. The apparent, but erroneous, correlation of those
The composite nature of the Provo level of Lake Bonneville, GreatBasin, Western North America
C 14 dating ; Geochronology ; GreatBasin ; Lake level ; Palaeo-environment ; Palaeolake ; Photointerpretation ; Pleistocene ; Quaternary ; Shoreline ; Stratigraphy ; United States of America
Datation C 14 ; Etats-Unis ; GreatBasin ; Géochronologie ; Ligne de rivage ; Niveau lacustre ; Paléo-environnement ; Paléolac ; Photo-interprétation ; Pléistocène ; Quaternaire ; Stratigraphie
Deposits of a transgressive-phase Lake Bonneville stillstand or oscillation are found just below the elevation of the regressive-phase Provo shoreline at numerous exposures throughout the Bonneville basin. Existence of these sub-Provo shoreline
Paleomagnetic records are used to correlate sedimentary sequences from pluvial Lakes Chewaucan and Russell in the western GreatBasin. This correlation is the basis forage control in the relatively poorly dated sequence from Lake Chewaucan
Climatic change, population growth, and their effects on GreatLakes water supplies
Amérique du Nord ; Changement climatique ; Croissance démographique ; Dioxyde de carbone ; Environnement ; Etats-Unis ; Etude d'impact ; GreatLakes ; Géographie de l'Amérique ; Prospective 2035 ; Ressource en eau ; Scénario
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.
Geomorphology of a dry valley : Adrian Pass, Lahontan Basin, Nevada
Lake ; Nevada ; Palaeogeomorphology ; Quaternary ; United States of America ; Valley
Previous studies of Adrian Pass concluded that it was an abandoned channel of the Walker River. The evidence presented in this study suggests that Adrian Pass was formed by overflow of Lake Lahontan, the second-largest GreatBasin Quaternary lake
, from the lower Walker River Basin to the Carson Desert Basin. Walker River occupancy of Adrian Pass during post-Lake Lahontan time was relatively brief. - (SLD)
Paleomagnetic investigation of the Bonneville Alloformation, Lake Bonneville, Utah
California ; Geochronology ; Lacustrine sediment ; Lake level ; Nevada ; Palaeo-ecology ; Palaeomagnetism ; Pleistocene ; Quaternary ; United States of America ; Utah
Paleomagnetic secular variation in a portion of the Bonneville Alloformation is compared with secular variation in lacustrine sediments in the Mono Basin, California, and with secular variation in Lake Lahontan sediments in the northwestern Great
Basin. The deposition occurred during a transgressive stage of Lake Bonneville and coincided with a wet period in the Lahontan Basin.
New evidence for an extended occupation of the Provo shoreline and implications for regional climate change, Pleistocene Lake Bonneville, Utah, USA
C 14 dating ; Climatic variation ; Holocene ; Lake level ; Palaeo-environment ; Palaeolake ; Pleistocene ; Shoreline ; United States of America ; Utah
Lake Bonneville was a climatically sensitive, closed-basinlake that occupied the eastern GreatBasin during the late Pleistocene. Radiocarbon data from this and other studies suggest that the lake oscillated at or near the Provo level much longer
than depicted by current models of lake level change. Radiocarbon data also suggest that the lake dropped from threshold control much more rapidly than previously supposed. These revisions to the Lake Bonneville hydrograph, coupled with independent
evidence of climate change from vegetation and glacial records, have important implications for conditions in the Bonneville basin and during the Pleistocene to Holocene transition.
Mapping the GreatLakes. The period of exploration, 1603-1700
Amérique du Nord ; Carte ancienne ; Cartographie ; Exploration ; GreatLakes ; Histoire de la géographie ; Siècle XVII
L'exploration et la cartographie des Grands Lacs ont commencé avec les travaux de Champlain et se sont poursuivies jusqu'à la fin des années 1680. Dès 1690, les lacs et le bassin hydrographique avaient été explorés et portés sur les cartes, au moins
Evidence for the intra-Glenwood (Mackinaw) low-water phase of glacial Lake Chicago
Canada ; Glaciaire ; Glaciolacustre ; GreatLakes ; Géographie de l'Amérique ; Lac ; Niveau lacustre ; Paléo-environnement ; Quaternaire
The 14C age control on the stratigraphy at the Riverside site in Michigan confirms that an intra-Glenwood low-water phase occurred in the Lake Michigan basin during the Mackinaw Interstade. The existence of low-level lakes at this time also
indicates that the ice margin of the Lake Michigan lobe must have retreated at least as far north as the Straits of Mackinac region during the Mackinaw Interstade.
Possible impacts on water resources in the GreatLakes and the Saskatchewan River sub-basin
Note sur l'impact du réchauffement global sur les ressources en eau dans le bassin des Grands Lacs et dans le sous-bassin de la Rivière Saskatchewan. On pose les problèmes que suscite le développement de modèles régionaux.―(L. Dion).
The influence of thermokarst disturbance on the water quality of small upland lakes, Mackenzie Delta region, Northwest Territories, Canada
Arctic Region ; Canada ; Cold area ; Delta ; Hydrochemistry ; Lake ; Northwest Territories ; Permafrost ; Thermokarst ; Tundra ; Water quality
Chemical data are presented for water from 22 lakes in small upland catchments (
) concentration of the pristine lakes is greater than the mean concentration of lakes disturbed by thermokarst slumping. Soluble materials released from degrading permafrost are transported to lakes by surface runoff, elevating concentrations in lake water
. The percentage of total basin area influenced by thermokarst is positively associated with ionic concentrations in lake water and inversely related to DOC.