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.
Evaluating trophic status and restoration procedures of a polluted lake, Lake Kastoria, Greece
The present study deals with a hydrological analysis of the lake, an estimation of nutrient loading with the evaluation of its trophic status based on the total phosphorus input, and finally with remediation techniques applicable to the lake.
Algal bloom in a shallow lake with a special reference to lake (loch) Lindores, Scotland in Shallow lakes environment. (L'environnement des lacs eutrophes)
The climatology of lake effect in Milwaukee, Wisconsin
The paper examines the frequency of occurrence of both warm season and cool season lake effects. The monthly distribution of the different types of lake effect, weather conditions favorable to their development, and associated parameters are also
The use of total lake-surface area as an indicator of climatic change : examples from the Lahontan 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.
Lake-Müggelsee - The use of lake water and its consequences in The eastern part of Germany.
The use of the lake and its catchment area has continuously increased during the past decades and has caused a substantial deterioration of the lake water quality. The lake water shows signs of a permanently growing eutrophisation. Phosphorus
A note on the water budget of Lake Naivasha, Kenya : especially the role of Salvinia molesta Mitch and Cyperus papyrus L.
Bilan hydrologique ; Evaporation ; Evapotranspiration ; Géographie physique ; Kenya ; Lac ; Naivasha Lake ; Variation du niveau lacustre ; Végétation
The introduction of Salvinia in the 1960's has therefore hardly increased the water loss from the lake, whereas the influence of papyrus on the water budget of the lake can not be disregarded. Nevertheless, the water budget studies and studies
of the chemistry of the lake give strong support for the theory suggesting the existence of an underground outlet of the lake.
Illustration of the roles of snow in the evolution of the winter cover of a lake
Analyse spatiale ; Canada ; Elizabeth lake ; Glace ; Géographie physique ; Labrador ; Lac ; Manteau nival ; Neige ; Newfoundland ; Zone froide
Spatial patterns in the snow and ice cover of Elizabeth Lake, Labrador, as surveyed in late February 1979, are displayed and analysed. Relationships between distinct trends in the ice and less distinct trends in the snow are discussed within
a context of processes operative during a winter. The nature of and spatial patterns in the winter cover of lakes and their evolution have important implications for those interested in generalizing about lake ice properties and about the effects of snow
Lake sediment cores from the Antarctic peninsula and surrounding islands
Sediment cores from two lakes on the Antarctic Peninsula, Hidden Lake on James Ross Island and Lake Boeckella in Hope Bay, are described, analysed and dated with regard to climatic changes during the Holocene.
Amérique du Nord ; Circulation atmosphérique ; Great Lakes ; Géographie physique ; Lake Superior ; Pression atmosphérique ; Température ; Variation climatique
Variations in atmospheric circulation and spatial and temporal patterns of sea-level pressure anomalies over eastern North America are highly correlated in time with temperature trends in the Lake Superior area. Lake Superior region temperature
trends have not been the same for all seasons. January and July temperatures were highest in the mid-1930s| those for April and October culminated later. Differences in the timing of temperature peaks within the Lake Superior region are related mainly
to variations in pressure anomalies over western Canada and with associated anomalous air flow components across the Lake. Pressure anomalies over the southwestern United States and opposite anomalies to the east have been less important and they have affected
mainly the temperatures over the eastern part of region. About seventy to eighty percent of the temperature variance for the Lake Superior region is related to about twenty-five to thirty percent of the pressure variance for eastern North America.
Holocene environmental changes in Lily Lake, Minnesota inferred from fossil diatom and pollen assemblages
In this study the diatoms show that Lily Lake had higher alkalinity and trophic status during the mid-Holocene. It is likely that the lake level was lower during this time also. At the same time the pollen shows an expansion of prairie vegetation
to the lake watershed. At the end of the prairie period lake trophic status and alkalinity declined and forest expanded.
Localised enhanced sedimentation from icebergs in a proglacial lake in Briksdal, Norway
Studies of the ice-contact proglacial Briksdal Lake have demonstrated that drifting icebergs congregate in a well-defined zone near the outlet. Deposition of the englacial debris from decaying icebergs is concentrated within this area forming
a shallow underwater shelf and associated beach. It is suggested that this process may have characterized former proglacial lakes.
Bank recession processes, rates, and prediction, lake Sakakawea, North Dakota, U.S.A.
Analyse de régression ; Erosion ; Etats-Unis ; Géographie physique ; Hydrologie appliquée ; Lac ; Lake Sakakawea ; Niveau lacustre ; North Dakota ; Prévision ; Statistique
Study of the erosion processes and erosion rates and development of a bank recession predictive model for lake Sakakawea. The first part of this paper summarizes the results of that study, leading to the potential for a predictive capability.
Chironomidae (Diptera) and postglacial climate at Marion Lake, British Columbia, Canada
Chironomid (midge) remains analyzed from an 8.95-m-long sediment core from Marion Lake reveal successional changes over the last 12,000 yr since deglaciation. The response of the chironomid community accords well with paleoclimatic inferences based