Has anyone consider the fact that the trash accumulating along the Yangtze will eventually flow down stream and into the Hydro-Turbines causing damage?

Maybe even massive and expensive damage.

Perhaps it will perform as hoped, assuming success in meeting the technical unknowns. Unknowns of vast mortal consequence to which the experimental answers play loose with lives, vast environmental regions, and massive economic investment.

The disregard for archeological knowledge to be lost is a fateful short sight.

Decentralized hydroelectric damming and upgrading in existing dams would provide much in water reservation and power while also dispersing risks over a multiplicity of safeguarding redundancies; To wit, in the redundant, smaller, technologically safer and usefully decentralized existence of many smaller dams. 

The centralization of resources is a tendency in authority centralized societies. It reinforces a hierarchical leadership’s hold on power by allowing it to control access according to the support of it’s continued rule. This is irrelevant to whether the government claims it’s capitalist or socialist. If it’s rulers are entrenched and it’s politics undemocratic it resists decentralization generally. The Three Gorges Dam is to become a monument to this phenomenon. Hopefully the damage it does, as terrible as it is, will not make it more of a monumental curse than is already expected.

This is what resource management is all about. Many more millions of poeple would benefit from this project, far more than the number of people displaced. These people would have to move when poverty hit them anyway.