Page 248 - Handbook of Gold Exploration and Evaluation

Sedimentation and detrital gold 219

4.13 Numbered stream distribution (after Force, 1991).

channels, with ratios greater than 100:1 are essentially un-channelled. There are
many graduations between them. As described in a detailed review of the
historical development of fluvial sedimentology by Miall (1985), the extreme
complexity of the relationships that exist between different channel styles results
from the great variety of independent controls associated with their
development. Channels are usually classified according to their patterns and
corresponding sediment types (bed-load, mixed load and suspended load) in Fig.
4.14. Rust (1978) defines four basic types of channels according to high (greater
than 1.5) or low (less than 1.5) sinuosity as shown in Table 4.4.

4.3.3 Channel shape
Definitions of geometric elements of fundamental importance to studies of
stream channel flow can be illustrated from the dimensions shown in Fig. 4.15.