Basic Nonlinear Theory On The "Weak" Dynamic Process Of River

The"weak"dynamic process of river is in a very important position, which is as a part of the study of the modern river dynamics. It is not only the base of the modern river mechanics study, which can make great contributions to the future development of it; but also has become one of the most important parts of it.The"weak"dynamic process of river is studied extensively and deeply in this paper to make a good understanding on the interaction principles of the river, sediment and the flow. The theoretical model on the various aspects of the river process is established to study the dynamics of it by using the methods of mutation and mathematic theory that always used in the turbulent study, which includes: the stability characteristics of the open channel flow on an uneven bed, the effects to the stability characteristics of the laminar flow in open channel by the suspended load, the effects to the development of the bed form by the bed load in the river and the principles of the dunes formation in the open channel. And something in this paper is discussed in detail, for instance: the structure of the open channel flow on the irregular bed, the stabilized effects of the suspended load, reasons that caused the nonlinear dynamic and kinematic characteristics of the particles of the bed load, and the nonlinear evolution principle of the dunes. On the basis of these, the flow characteristics are measured by the ADV in Chapter 7, and finally, some results about the effect of the flow structure on the bed for development are got. And it is proved that some of the phenomenon can bed well explained by the some of the theoretic results.The main contents of this paper—the basic theory of the"weak"dynamic process of the river, has the contributions not only to the modern river dynamic but also to the application of the turbulence theory to the hydraulic. And the study of the sediment movement law is basis not only to the study of the bed form in the open channel, but also to the further understanding to the aeolian dune formation.