Laserfiche WebLink
<br />The results of the theoretical and laboratory studies relating <br /> <br />roughness to relative snoothness (a depth parameter divided by a part- <br /> <br />icle size) are not entirely consistent. Verification using field data <br />has not always been conclusive (Limerinos, 1970). This is probably due <br />to a combination of several factors: (1) The theoretical and laboratory- <br />derived relations are based on uniform flow (a condition rare or absent <br />in natural channeis), particle size, and on distribution of particle <br />size, (2) few natural-flow streams exist in which some other factors do <br />not affect channel roughness, and (3) there is an unknown model-to. <br />prototype error.associated with the theoretical and laboratory-derived <br />relations. In addition, although theoretical studies provide a sound <br />derivation of the processes involved in flow resistance, the studies <br />have been tested only generally with flume data or are too complex for <br />practical appl ication. <br /> <br />I <br /> <br /> <br />r <br />