Abstract
Abstract The analysis of earth surface systems is complicated by mutual adjustments among geomorphic variables. Most statistical models used by geomorphologists implicitly assume unidirectional causation. Simultaneous-equation models represent an alternative statistical approach by which mutual adjustment mechanisms can be analyzed explicitly. This technique is used to develop a process-response model of a small desert mountain fluvial system in order to examine the system's internal structure and dynamics. In general, results confirm the expected interactions among variables in the model. Discharge, size of bed material, and the type of bank material are the dominant factors directly influencing channel width, suggesting that channel form reflects an interaction among hydrologic conditions, the caliber of the sediment load, and the resistance imposed by the channel perimeter. Results also indicate that local and upstream energy conditions strongly influence the mean grain size and sorting of the streambe...
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