we have two good matches.
the first one: one sand suction dredger, two or three sand transporters and one small discharge dredger, the sand suction dredger can suck sand and load the sand transporter and then the sand will be transported to the riverside, and then dump to the water, at last the small discharge dredgerwould suck and dicharge to the river shore;
The second: auto self-propelled and loading sand suction transporter and discharge dredger. The transporter can suck and load by itself, after the sand cabin full, it can sail to the riverside and dump, and then the discharge dredger will discharge sand to the river shore. The second one method is used very widely in China.