A new method for calculating displacement of riprap in river harness;

Calculation of Drift Distance for Hydrodynamic riprap;

Several problems of scour protection by riprap bank;

After studying the characteristics of drifting, classification, erosion resisting of rock riprap by combining flume experiment and field measurement, this paper presents a better way of rock riprap and a type of protecting the riverbed which can not only improve the stabilization of the seawall, but also save the investments of the project.

The experimental results indicate that the azidation of the precursor,polyepichlorohydrin (PECH),is always accompanied with its chain breaking.

In order to solve scraper breaking, scraper bending, chain breaking, coal piling up at tailing end, chain buoying up etc.

The riprap mound layer of sea reclamation consists of block stones with the looseness of structure,big pore and influenced by the fluctuation of ocean tidal,which results in the collapse of driven cast-in-place pile of impact pore-forming.

Adopting the construction scheme which combines iron-frame moulded board with unsegragating concrete underwater and encircling steel hoop on glass fiber reinforced plastic mortar pipes,the difficulty in construction of outfall in riprap mound within a short period period is overcome.