Basic Methods for Sediment Transport Calculations

4_010491
Page Navigation
233

coefficient.

Kodoatie et al. (1999) Power Function Relationship

The Kodoatie method (modified Posada (1995)) can be used for streams with bed material

size ranging from silt to gravel. It provides a coefficient and exponents based on classifying

streams as silt, fine sand, medium to coarse sand and gravel bed (Table 4.4). The method is

useful for rapid calculations of bed-material discharge.

Yang (1996) Sand and Gravel Equations

The Yang equations can be used for sand and gravel total load estimation. The equations

can be applied by size fraction or to the median size. The gravel equation should be limited

to median sizes between 2.0 and 10.0 mm.

Computer Models

The use of computer models is beyond the scope of this manual, but programs are available.

Two of the better known computer models are:

BRI-STARS (Molinas 2000)

HEC-6 (U.S. Army Corps of Engineers 1993)

These computer models have the ability for user-selected sediment transport relations

(including most of those shown in Table 4.1 see Section 4.6) and power relationships. The

models can be used to determine the total sediment discharge for a given flow or to

4.36