Tie channel sedimentation rates, oxbow formation age and channel migration rate from optically stimulated luminescence (OSL) analysis of floodplain deposits
The dated sediments were collected from the banks of tie channels along the Lower Mississippi River, the Fly River in Papua New Guinea, and Birch Creek along the Yukon River in Alaska. Tie channels connect the oxbowlakes to the main stem river
and allow the exchange of water and suspended sediment between the two. In all 3 river systems, OSL dating allowed the determination of vertical accretion rates, tie channel advancement rates, and oxbowlake ages.
Oxbowlakes as indicators of river channel change : Leaf River, Mississippi, USA
Channel geometry ; Gravel mining ; Human impact ; Meander ; Mississippi ; Oxbow-lake ; Stream ; United States of America
This study uses oxbowlakes to ascertain the extent and nature of change in a river's form, focusing on the effects of post-1950s floodplain gravel extraction on the geomorphology of the Leaf River in southeastern Mississippi, USA. Data from 12
This paper intends to make channel-fill sedimentological sequences more useful recorders of channel abandonment processes and palaeofloods, for which improved understanding is needed of the internal build-up of channel fills. The AA. review oxbow
lake infilling along meandering rivers, and supplement this with highly detailed descriptions of 2 selected field examples of channel fills from the apex-region of the Netherlands' Rhine delta. From these examples it becomes clear that regional setting
and type of abandonment result in different channel-fill end-members; oxbow cutoffs generally produce thick laminated clayey fills as the channel entrance is plugged rapidly, avulsion-abandoned channels are filled with coarse (proximal) deposits as a result
begins after the meander cuts off, creating an oxbowlake. The AA. hypothesize also that, in the absence of channel migration, bald cypress will be replaced by other species.
The proportion of pollen is studied together with dating, CaCO content, humus as well as stratigraphic conditions. The history of the formation and filling of the oxbowlake SW of the village of Oros and the evolution of abandoned riverbeds
meanders and oxbowlakes, Aeolian mounds and number of irrigating canals. A lot of maps and photographs are used since the second Military mapping 1827-1830. - (MS)
European part of Russia ; Flood ; Geosystem ; Hydrochemistry ; Hydrology ; Lake ; Nizhny Novgorod ; Oxbowlake ; Residence time ; Stream ; Underground water
The AA. studied 3 cores from a well-dated sediment archive from an oxbowlake of the River Morava, Czech Republic, using a high-resolution (1 cm) multiproxy stratigraphic analysis and a concentration of selected heavy metals. The aim
surface. Two types of transformations are highlighted : from braided to meandering channel pattern; from meandering to sinuous pattern with channel islands and then to sinuous with oxbowlakes.
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)