Intrusion of Turbid Water in Stratified Lakes Driven by Resuspension of Sediments on Sloping Boundaries

DOI

Bibliographic Information

Other Title
  • 成層湖斜面上の底泥の再浮上に伴う濁水の貫入現象

Abstract

The thermal ‘staircase’, a layer of constant temperature, was observed in seasonal thermoclines following the resuspension of cohesive sediments resuspension on the shore slope of Lake Biwa. When a moderate onshore wind blew, the bed materials were resuspended up to the mid thermocline with height of 2.5 m above the bottom, and settled down forming the staircase above the intrusion. As the consequence, the thermocline was divided into two layers by the staircase with a thickness of 0.7 m. To investigate the resuspension and settling process due to surface and internal waves in stratified lakes, laboratory experiments were conducted using a tank with a partial slope at one side. When the internal waves generated as the barotropic waves in the tank, the resuspension phenomena occurred frequently. Both surface and internal waves are essential for the resuspension process. In the stratified fluid, the distance and duration of suspended sediment transport are very long compared to that in the non-stratified one due to occurring of the intrusion into the stratified layer.

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Details 詳細情報について

  • CRID
    1390282680147571840
  • NII Article ID
    130004042398
  • DOI
    10.2208/prohe.40.607
  • ISSN
    18849172
    09167374
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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