According to sine derivative curve which is put forward by langbein W B,Leopold L B,the situation of mountain river meanders in Yalujiang is analyzed,and a new solution is selection of curvature r.

Through analyzing and arranging the actual data measured of mountain area rivers in southwest of China,we summarize:The ideal channel flow route should have sine derivative curve flow route,harmonized flow direction,good flow route corner and bigger curve radius.

The paper puts forward a governing equation suiting for winding bend training of braided channel in the lower Yellow River,revises the planned thalweg at the sections where river training works are uncompleted at present and exams the layout of planned flow path based on the theory of sine derivative curve.

Illustrating ellipse and sinusoid curves,the coordinate conversion and programming in the process of using macro command were stated.

In this paper we discuss the representation of integral circle,cycloid and sinusoid on a period by uniform C-B-splines of degree 3.

A digital frequency synthesizer without ROM look up table is presented,a piecewise linear interpolation scheme is used to approximate a sinusoid function.

Considering the sine curve as the primary equation of hydraulic geometry andsolving togather with continunity eqution of water flowing and other relative equations, depth, breadth and slope of sinuous channel have been deduced.

A real-time fast interpolation algorithm for hdical and sine curves based on the principleof time-slicing method is proposed.

This paper discusses a method of synthesizing free curve and sine curve.

A Fast Approach to Detect a Kind of Sinusoidal Curves Using Hough Transform;

In present work, it is exceedingly difficult to control the scale and precision of some special surfaces such as sinusoidal curve, ellipse, parabola, etc.