Stream geomorphology in amountain lake district: Sediment links, lake-modified hydraulics, anddownstream lake effectsEarth Surface Processes and Landforms (2007)
AbstractLakes are common in glaciated mountain regions and geomorphic principles suggest that lake modifications to water and sediment fluxes should affect downstream channels. Lakes in the Sawtooth Mountains, Idaho, USA, were created during glaciation and we sought to understand how and to what extent glacial morphology and lake disruption of fluxes control stream physical form and functions. First, we described downstream patterns in channel form including analyses of sediment entrainment and hydraulic geometry in one catchment with a lake. To expand on these observations and understand the role of glacial legacy, we collected data from 33 stream reaches throughout the region to compare channel form and functions among catchments with lakes, meadows (filled lakes), and no past or present lakes. Downstream hydraulic geometry relationships were weak for both the single catchment and regionally. Our data show that downstream patterns in sediment size, channel shape, sediment entrainment and channel hydraulic adjustment are explained by locations of sediment sources (hillslopes and tributaries) and sediment sinks (lakes)...
Citation InformationArp*, C.D., J.C. Schmidt, M.A. Baker, and A.K. Myers. 2007. Stream geomorphology in a mountain lake district: Sediment links, lake-modified hydraulics, and downstream lake effects. Earth Surface Processes and Landforms 32: 525–543.