Locational Probability for a Dammed, Urbanizing Stream: Salt River, Arizona, USA.

摘要: / Data from historical aerial photographs analyzed with a GIS show that river channel change on the Salt River in Phoenix metropolitan area of central Arizona has been driven by large-scale regional flood events and local human activities. Mapping functional surfaces such as low-flow channels, high-flow islands, bars attached to banks, engineered shows during period 1935 1997, relative areal coverage these changed. Flood have caused general changes sinuosity channel, but islands remained remarkably consistent location size, while channel-side waxed waned. The most important determinant form process is sand gravel mining, which some reaches occupies more than 70% active area. mining closely related moving urban fringe, serves market for construction. Quantitative spatial analysis imagery supplemented field mapping each within area, it possible specify probability encountering or other fluvial features. Maps showing distribution probabilities occurrence reveal probable configuration occurred past. Some located persistently limited result bedrock controls, dominated flow separation shallow gradient almost no persistence one another.