Theoretical Model and Solution of Dynamic Evolution in Initial Stage of Lacustrine Delta

Sediment is carried by flows into lake during the formation of lacustrine deltas. The subsequent movement sediment-laden flow maintained initial momentum at early stage delta growth. A theoretical model plane jet boundary layer in a delta, including consideration gravity action on slope and bottom friction, was established according to characteristics this process, similarity solution method used solve model. coefficient ε introduced that describes spreading along straight line its value given. expression morphological derived based general mathematical river bed evolution, erosion deposition patterns were quantitatively analyzed. It verified through experimental data can be solved accurately and, satisfactorily describe trend delta.