Hydrodynamics of a Supraglacial Lake and Its Effect on the Basin Expansion: Tsho Rolpa, Rolwaling Valley, Nepal Himalaya

DOI DOI Web Site 被引用文献8件 オープンアクセス

書誌事項

公開日
1999-02
DOI
  • 10.2307/1552623
  • 10.1080/15230430.1999.12003281
公開者
Informa UK Limited

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説明

The thermal structure and hydrodynamics of supraglacial Tsho Rolpa Lake (27?51'N, 86?29'E) in the Nepal Himalaya were examined in the premonsoon of 1996. We continuously measured flow velocity, water temperature, and turbidity with moored self-recording current meters, temperature data loggers, and turbidimeters. Vertical measurements (every 0.2 m in depth) of water temperature and turbidity were also made by lowering a self-recording sonde. Tsho Rolpa Lake (surface area, 1.39 km2 at present) has increased in size since late 1950s (surface area, 0.23 km2 in 1958) by both glacial ice melt below the lake bottom and the retreat of the glacier terminus. Lake stratification is defined by suspended sediment concentration (SSC) rather than by temperature. The suspended sediment is mostly silt and clay (d -5?C) into continual contact with the glacier terminus. This warm water contact could induce calving of the upper glacier-ice by increasingly melting the subaqueous lower part.

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