LakeOmeo is a relic of a more extensive lake formed when a basalt flow, dated as Upper Pliocene in age, dammed the flow of Morass Creek. This larger lake is referred to as Lake Morass. Downfaulting of part of the LakeOmeobasin and upthrow
of a narrow horst between the Morass Creek and Minute Creek catchments probably occurred at about the same time or later. Sedimentation of the natural overflow gap of the LakeOmeobasin during the existence of Lake Morass resulted in the basin becoming
isolated from Morass Creek as the basalt flow was incised. Clay sediments over 40 m thick were deposited in the downfaulted part of the basin. Two clay lunettes to the southeast of the present lake, and material of fluvial and lacustrine origin provide
evidence for alternation between wet periods when high water levels prevailed and dry periods with low water levels during which lunette building occurred. The evidence has been interpreted as indicating major changes in climate in the history of the lake
. At least three lunette building phases are proposed, separated by periods of high lake levels. A palaeosol buried beneath a layer of clay of lacustrine origin is ascribed an Upper Pliocene origin.
Assessing transformation and sustainability in the Great LakesBasin
Canada ; Ecosystème ; Environnement ; Gestion de l'environnement ; Great Lakesbassin ; 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 Great LakesBasin and to explore its implications for management of the Basin.
Highest pluvial-lake shorelines and Pleistocene climate of the Western Great Basin
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 Great Basin 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 Great Basin.
The purpose of this paper is to illustrate the strengths and weakness of using lake size and, in particular, lake level, as an indicator of climatic change. The lake-level record for one closed-basin system (Lake Lahontan) is examined in terms
of existing topographic and hydrologic features that have constrained its variation. The total surface areas of lakes in a basin is shown to be a more appropriate measure of change in the hydrologic balance.
Glacial-lake outburst erosion of the Grand Valley, Michigan, and impacts on glacial lakes in the Lake Michigan Basin
Catastrophe ; Flood ; Glacial erosion ; Glacial features ; Glacial lake ; Ice breakup ; Lake level ; Michigan ; Palaeogeography ; Quaternary ; United States
The purpose of this paper is to document the outburst origin of the Grand Valley and to explore the implications of these events upon interpretations of the timing and processes of lake-leved changes in glacial Lake Chicago.
General information about the Šumava Mountain lakes, about the smallest one - the Laka Lake. The main aim was establish the previse altitude of the lake Laka and to draw its ground plan and bathymetric map. Geographic position and morphometric
characteristics of catchment area are described as well. Differently from the other Šumava lakes, the Laka Lake is interesting by its relatively intensive silting processes. - (MS)
Greatest lake period and its palaeo-environment on the Tibetan Plateau
China ; Lake ; Lake level ; Monsoon ; Palaeo-environment ; Palaeoclimate ; Palaeolake ; Plateau ; Tibet
The greatest lake period means that the lakes are in the stage of their maximum areas. As the paleolake shorelines are widely distributed in the lakebasins on the Tibetan Plateau, the lake areas during the greatest lake period may be inferred
by the last highest lake shorelines. They are several even ten times larger than that at present. The occurence of maximum areas of lakes marked the very humid period on the Plateau and was also related to the stronger summer monsoon during that period.
The Mladotice lake is the four largest and also the youngest lake in the country. It is located on the Mladotice stream, the left bank tributary of the Střela River in the west Bohemia. Extreme rains in May 1872 and the construction of the railway
(Plzeň-Žatec) caused the slide. The block type movements dammed in several days the valley. The new lake was deep 21 m. Under several investigations are most important the measurements in 1972. The last data come from the bathymetric survey in 1990
. The Mladotice lake presents an unique natural phenomenon which however progresses fast to its vanish. - (MS)
The geographic research on the Šumava lakes has a long tradition at the Charles University of Prague. Tha main aim was to establish the exact altitude of Plešné Lake and to draw its ground plan and a bathymetric map. Geographic position amd
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 Great Basin 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
The Mladotice Lake, western Czechia: the unique genesis and evolution of the lakebasin
Chronostratigraphy ; Czech Republic ; Heavy rain ; Lacustrine sediment ; Lake ; Landslide ; Stratigraphy
The Mladotice Lake is a lake of unique genetic type in Czechia. In May 1872 a landslide as a result an extreme rainfall event occurred in western Czechia, blocking the Mladotický stream valley and creating the Mladotice Lake. Our analysis
A revised chronology for the last Pleistocene lake cycle in the central Lahontan basin
Amérique du Nord ; Datation radiocarbone ; Domaine aride ; Etats-Unis ; Great Basin ; 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
The postglacial history of Lake Manitoba has been deduced from a study of the changes in physical, mineralogical, and chemical variables in sediment cores collected from the lake. Six lithostratigraphic units are recognized in the South Basin
of the lake. Weakly developed pedogenic zones, reflecting dry or extremely low water conditions in the basin, separate five of these six units. The initial phase of lacustrine sedimentation in the Lake Manitoba basin began shortly after 12,000 yr B.P. as water
was impounded in front of the receding glacier to form Lake Agassiz.
Paleolimnology of two lakes in the Klutlan Glacier region, Yukon Territory, Canada
of lake initiation seldom reflects moraine age. Even on the oldest moraine (Harris Creek), lakebasins are presently forming. Vegetation and soil development play an important but secondary role in determining the character of lake sediments| rapid
penetrating the oldest moraine, revealed progressive limnologic changes through time, suggesting that their basins were stable for 1200 and 400 yr, respectively. The changes in diatom stratigraphy of these lakes appear to relate to natural limnological changes
Geochemical and paleontological studies of surface sediment to a serie of lakes on progressively older moraines provide baseline information for comparing successive levels of lake sediment cores from older moraines. Results indicate that the time
subsidence can convert humic-water lakes surrounded by second-generation spruce forests into turbid-water lakes with unstable, slumping margins. A detailed paleolimnological study of two lakes, one on the unglaciated upland and another in an outwash channel
associated with lake maturation and accumulation of nutrients as well as to changes in the surrounding vegetation and soils.
The aims of this paper are to : identify thaw lakes and drained thaw lakebasins (DTLBs) in the western Arctic Coastal Plain (ACP); develop several geometric shape metrics for lakes and basins, and perform statistically-based spatial
and morphometric analyses to compare lakes and basin metrics within and between 3 subregions of the ACP. The primary purposes are to determine if significant differences in shape metrics exist across space, to determine if such metrics can be used to discriminate
Bathymetry ; Czech Republic ; Glacial lake ; Lake ; Lake level ; Limnology ; Thematic map
The main aim of research was to make a precise ground plan to characterize the depth conditions of the lakebasin and to determine the altitude of the lake level. The bathymetric maps of the second largest glacial lake in Czechia. - (MS)
Channel geometry ; Drainage network ; Glacial lake ; Idaho ; Lake ; Mountain ; Stream ; United States of America ; Watershed
Lakes in the Sawtooth Mountains, Idaho, were created during glaciation and the AA. sought to understand how and to what extent glacial morphology and lake disruption of fluxes control stream physical form and functions. First, they described
downstream patterns in channel form including analyses of sediment entrainment and hydraulic geometry in one catchment with a lake. Furthermore, they collected data from 33 stream reaches throughout the region to compare channel form and functions among
catchments with lakes, meadows (filled lakes), and present lakes. The results suggest that sediment sinks, such as lakes, in addition to sources, such as tributaries, are important local controls on mountain drainage networks.
Buried soils in a perched dunefield as indicators of Late Holocene lake-level change in the Lake Superior Basin
Datation C 14 ; Dune ; Eolien ; Etats-Unis ; Holocène ; Lac ; Lake Superior ; Michigan ; Niveau lacustre ; Paléo-écologie ; Paléosol ; Quaternaire ; Stratigraphie
Aeolian features ; C 14 dating ; Dune ; Holocene ; Lake ; Lake level ; Michigan ; Palaeo-ecology ; Palaeosol ; Quaternary ; Stratigraphy ; United States of America
timing of periods of stability and instability along the banks, thereby providing an indirect record of changes in lake levels within the Lake Superior basin.
This study uses soil stratigraphy and 14C dating to explore connections among lake levels, characteristics of buried soils, and Holocene dunefield evolution. If periods of high and low sediment supply occured, a record of buried soils may elucidate
Reevaluation of the lake-sediment chronology in the Dead Sea Basin, Israel, based on new 230Th/U dates
Dating ; Dead Sea ; Geochronology ; Isotope analysis ; Israel ; Lacustrine sediment ; Lake level ; Palaeogeography ; Stratigraphy ; Th/U dating
The Dead Sea is surrounded by chemical and detrital sediments that where deposited in its larger precursor lakes, Lake Samra and Lake Lisan. The sedimentary history of these lakes was reconstructed by means of 230Th/234 U ages of 30 samples