Assessment Methodology for Determining Historical Changes in Mountain Streams

摘要

One way to quantify the adjustability of a stream is to examine its geomorphichistory. One source of historic geomorphic data are the records associated with stream gaging stations maintained by U.S. Geological Survey. This report describes what records are available, how to organize the data on computer spreadsheets, and adjustments. The discharge measurements include physical measurements of the channel. In particular, USGS discharge measurements include physical measurements of the channel. By analyzing these measurements collectively, it is possible to quantify monthly, annual, and decadal scales of adjustment. Once the history of channel adjustment is determined, it can be compared to histories of climate change, flow regulation, and land use. These comparisons may link the geomorphic adjustments to particular patterns, events, or activities.