A viscous fluid flowing over plastic grains spontaneously generates single-thread channels. With time, these laminar analogues of alluvial rivers reach a reproducible steady state, showing a well-defined width and cross section. In the absence of sediment transport, their shape conforms with the threshold hypothesis which states that, at equilibrium, the combined effects of gravity and flow-ind...

— Information Inputs to making decisions about recreational use of rivers are described. Major recre­ ational decisions and possible Inputs to them are Iden­ tified. A future scenario for recreational use of rivers Is given and the needed research on Information Inputs Is Identified within the context of the scenario. So much planning and management infor­ mation is being generated by river res...

The hydrology and geomorphology of large rivers in America reflect the pervasive influence of an extensive water control infrastructure including more than 75,000 dams. One hundred thirty-seven of the very large dams, each storing 1.2 km (10 acre feet) of water or more, alter the flows of every large river in the country. The hydrologic effects of these very large dams emerge from an analysis o...

River bedforms arise as a result of morphological instabilities of the stream-sediment interface. Dunes and antidunes constitute the most typical patterns, and their occurrence and dynamics are relevant for a number of engineering and environmental applications. Although flow variability is a typical feature of all rivers, the bedform-triggering morphological instabilities have generally been s...

http://www.jstor.org The Dynamics of Political Support for American Presidents Among Occupational and Partisan Groups Author(s): Douglas A. Hibbs, , R. Douglas Rivers and Nicholas Vasilatos Jr. Source: American Journal of Political Science, Vol. 26, No. 2 (May, 1982), pp. 312-332 Published by: Midwest Political Science Association Stable URL: http://www.jstor.org/stable/2111042 Accessed: 14-08...