Experimentml Study on the Diffusing Function of Cross-dyke

Abstract

When we dispose Sabo-works rationally, it is necessary to study the function of Sabo-work quantitatively.
In this paper, the author tried to numeriae the diffusing function of cross-dyke.
1) The author considered that the degree of cross undulation in a stream bed became an index of bed load's concentration.
2) The degree of cross undulation was presented as a numerical value by making use of standard deviation. And this numerical value divided by the cross Breadth was named as Degree of cross undulation (D.u. in short).
3) Degree of bed load's concentration (D.c. in short) in arbitrary length of Channel was exhibited as the average of D.u.
4) By surveying Channel work in field, it was confirmed that the bed load in narrow interval of cross-dyke dispersed broader than in wide one.
5) The model experiment proved that the bed load dispersed broadly under narrow interval of cross-dyke. And in case of becoming gentle slope, the bed load dispersed more broadly.
6) Consequently it can be considered that D.c. is one of effective methods in case of estimating the diffusing function of cross-dyke.