Late Pleistocene and late Holocene lake highstands in the Pyramid Lake subbasin of Lake Lahontan, Nevada, USA
C 14 dating ; Lake ; Lake level ; Nevada ; Palaeoclimate ; Quaternary ; Shoreline ; Stratigraphy ; United States of America
Shoreline geomorphology, shoreline stratigraphic position, and radiocarbon dates of organic material obtained from trench and quarry exposures provide evidence for 2 significant post-Lahontan highstand lake transgressions in the Pyramid Lake
subbasin. The AA. briefly compare their findings to previously published post-highstand Lahontan lake-level curves and other regional paleoclimate indicators.
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 lake basins 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.
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)
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.
Lake Vostok behaves like a captured lake and may be near to creating an Antarctic jökulhlaup
Antarctica ; Cold area ; Glacial lake ; Ice sheet ; Lake ; Model ; Palaeo-environment
This paper presents the first test of the captured ice shelf (CIS) hypothesis using field data from a modern ice sheet, by comparing the predicted geometry with that of Lake Vostok, the planet's largest existing sub-glacial lake, situated under
the East Antarctic ice sheet. It is showed that Lake Vostok agrees with this hypothesis. The result also implies that the lake may well be of pre-glacial origin, and that it may have experienced jökulhlaups during previous interglacials.
Stream geomorphology in a mountain lake district : hydraulic geometry, sediment sources and sinks, and downstream lake effects
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.
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)
Changes in the bathymetry and volume of glacial Lake Agassiz between 11,000 and 9300 C 14 yr B.P.
Amérique du Nord ; Bathymétrie ; Déglaciation ; Lac ; Lac glaciaire ; Lake Agassiz ; Modèle ; Niveau lacustre ; Paléo-environnement ; Quaternaire ; Sédiment lacustre
Bathymetry ; Deglaciation ; Glacial lake ; Lacustrine sediment ; Lake ; Lake level ; Model ; North America ; Palaeo-environment ; Quaternary
The volume and surface area of glacial Lake Agassiz varied considerably during its 4000-year history. Computer models for 7 stages of Lake Agassiz were used to quantify these variations over the lake's early history, between about 11,000 and 9300 C
Changes in the bathymetry and volume of glacial Lake Agassiz between 9200 and 7700 C 14 yr B.P.
Bathymetry ; Holocene ; Lake ; Lake level ; Model ; North America ; Palaeogeography ; Palaeohydrology ; Proglacial lake
Computer reconstructions of the bathymetry of the lake were used to quantify variations in the size and form of Lake Agassiz during its final 2 phases (the Nipigon and Ojibway phases). The estimates of Lake Agassiz volumes and releases presented
here provide a quantitative basis for evaluating the impact that Lake Agassiz may have had on North America and on the oceans into which it flowed.
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
A survey and classification of 202 lakes and reservoirs in the northwestern state of Oregon. Water quality is the focus of the report. All lakes are listed alphabetically with tables of attributes, photographs, drawings, maps, and diagrams
of temperature and oxygen. A substantial introduction provided to Oregon's lakes and the atlas. (DOH).
Holocene lake-level fluctuations of Lake Aricota, southern Peru
Andes ; C 14 dating ; Climatic variation ; Comparative study ; Holocene ; Lake ; Lake level ; Palaeo-environment ; Peru ; Quaternary
Lacustrine deposits exposed around Lake Aricota, a lake dammed by debris flows, provide a middle to late Holocene record of lake-level fluctuations. Chronological context for shoreline deposits was obtained from radiocarbon dating of vascular plant
remains and other datable material with minimal C 14 reservoir effects (
with a major lowstand at Lake Titicaca. Comparisons with other marine and terrestrial records highlight emerging contradictions over the nature of mid-Holocene climate in the central Andes.
Paleolimnology of two lakes in the Klutlan Glacier region, Yukon Territory, Canada
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
of lake initiation seldom reflects moraine age. Even on the oldest moraine (Harris Creek), lake basins are presently forming. Vegetation and soil development play an important but secondary role in determining the character of lake sediments| rapid
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
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
associated with lake maturation and accumulation of nutrients as well as to changes in the surrounding vegetation and soils.
Shoreline forms and deposits in Gallocanta Lake (NE Spain)
Climatic variation ; Lacustrine sediment ; Lake ; Lake level ; Quaternary ; Semi-arid area ; Shoreline ; Spain ; Zaragoza
This study attempts to deduce the present and past shoreline dynamics of a small shallow lake. Gallocanta Lake is located in the central Iberian Chain, NE Spain, within a typically Mediterranean semi-arid region.