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| A REVIEW OF THE PALEOHYDROLOGICAL AND GEOMORPHOLOGICAL CHARACTER OF LAKE NAM CO|SOUTHCENTRAL TIBET | |
| 作者单位： | Department of Earth Sciences|Freie Universität Berlin|Malteserstraße 74－100,12249 Berlin|Germany |
| 摘 要： | Department of Earth Sciences，Freie Universität Berlin，Malteserstraße 74－100,12249 Berlin，Germany) The endorheic Lake Nam Co，south Eastern Tibetan Plateau，was selected to investigate the interrelation between drainage basin processes，especially postglacial glacier decay，and lake level fluctuations. Landforms of the drainage basin are highly influenced by tectonics，superimposed by fluvial and periglacial processes，and locally by glacial and eolian processes. Thus，geomorphological features and hydrological characteristics were compiled for the lakebasin to provide an overview of the landscape character. Data show that during the Last Glacial Maximum melt water from the mountains accumulated fluvial deposits in the foreland. Concurrently，an increase of the lake level occurred which is presently shown by a cliff line all around Nam Co with its base approximately 29m above the present lake level. The Holocene decrease of the lake level is traced by beach ridges. As Nam Co is an endorheic lake postglacial water loss has to be primarily explained by evaporation and moisture conditions. However，more detailed conclusions on quantitative and chronological patterns of both factors，meltwater input and evaporation output，still remain to be drawn. |
A REVIEW OF THE PALEOHYDROLOGICAL AND GEOMORPHOLOGICAL CHARACTER OF LAKE NAM CO|SOUTHCENTRAL TIBET |
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| Institution: | Department of Earth Sciences|Freie Universität Berlin|Malteserstraße 74－100,12249 Berlin|Germany |
| Abstract: | Department of Earth Sciences，Freie Universität Berlin，Malteserstraße 74－100,12249 Berlin，Germany) The endorheic Lake Nam Co，south Eastern Tibetan Plateau，was selected to investigate the interrelation between drainage basin processes，especially postglacial glacier decay，and lake level fluctuations. Landforms of the drainage basin are highly influenced by tectonics，superimposed by fluvial and periglacial processes，and locally by glacial and eolian processes. Thus，geomorphological features and hydrological characteristics were compiled for the lakebasin to provide an overview of the landscape character. Data show that during the Last Glacial Maximum melt water from the mountains accumulated fluvial deposits in the foreland. Concurrently，an increase of the lake level occurred which is presently shown by a cliff line all around Nam Co with its base approximately 29m above the present lake level. The Holocene decrease of the lake level is traced by beach ridges. As Nam Co is an endorheic lake postglacial water loss has to be primarily explained by evaporation and moisture conditions. However，more detailed conclusions on quantitative and chronological patterns of both factors，meltwater input and evaporation output，still remain to be drawn. |
| Keywords: | lake level fluctuations beach ridges Late Quaternary drainage basin landscape units morphometry |
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