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Keyword: fluvial geomorphology

Multivariate geomorphic analysis of forest streams: Implications for assessment of land use impacts on channel condition

Publications Posted on: August 01, 2018
Multivariate statistical analyses of geomorphic variables from 23 forest stream reaches in southeast Alaska result in successful discrimination between pristine streams and those disturbed by land management, specifically timber harvesting and associated road building.

Biophysical ecology of streams in high elevation wet meadows

Projects Posted on: April 22, 2015
Wet meadow ecosystems host threatened and endangered species and are at high risk from climate change, wildfires, and water diversion. A typical wet meadow in the upper Middle Fork Salmon River, Idaho is the site of several prior and current investigations of stream ecosystem dynamics.

Safety of salmon nest sites in changing climates

Science Spotlights Posted on: April 21, 2015
Predictions of future climates include higher flows in mountain streams during mid-winter; a time when salmon eggs are incubating in streambed gravels. Unique stream bathymetry data and high resolution hydrodynamic models allow us to quantitatively assess the risk of bed scour and egg nest destruction in low gradient mountain streams during a variety of flows.

Remote sensing of stream channels

Documents and Media Posted on: January 23, 2015
Streams are dynamic landscape elements that integrate and reflect the terrestrial and hydrologic components of a watershed. The costs, logistics, and spatial extent of stream networks on Forest Service lands often limit stream studies and monitoring efforts to restricted spatial scales.Document Type: Briefing Papers

Geomorphic classification of rivers

Documents and Media Posted on: January 23, 2015
Over the last several decades, environmental legislation and a growing awareness of historical human disturbance to rivers worldwide have fostered unprecedented collaboration among scientists, land managers, and stakeholders to better understand, monitor, and restore riverine ecosystems.Document Type: Briefing Papers

Influence of large wood on channel morphology and sediment storage in headwater mountain streams, Fraser Experimental Forest, Colorado

Publications Posted on: September 30, 2014
Large fallen wood can have a significant impact on channel form and process in forested mountain streams. In this study, four small channels on the Fraser Experimental Forest near Fraser, Colorado, USA, were surveyed for channel geometries and large wood loading, including the size, source, and characteristics of individual pieces.

Structural organization of process zones in upland watersheds of central Nevada and its influence on basin connectivity, dynamics, and wet meadow complexes

Publications Posted on: September 05, 2012
The drainage network within upland watersheds in central Nevada can be subdivided into distinct zones each dominated by a unique set of processes on the basis of valley form, the geological materials that comprise the valley floor, and the presence or absence of surficial channels.

Remote sensing of channels and riparian zones with a narrow-beam aquatic-terrestrial LIDAR

Publications Posted on: December 02, 2009
The high-resolution Experimental Advanced Airborne Research LIDAR (EAARL) is a new technology for cross-environment surveys of channels and floodplains. EAARL measurements of basic channel geometry, such as wetted cross-sectional area, are within a few percent of those from control field surveys. The largest channel mapping errors are along stream banks.

A general power equation for predicting bed load transport rates in gravel bed rivers

Publications Posted on: July 24, 2006
A variety of formulae has been developed to predict bed load transport in gravel bed rivers, ranging from simple regressions to complex multiparameter formulations. The ability to test these formulae across numerous field sites has, until recently, been hampered by a paucity of bed load transport data for gravel bed rivers.