As is known to all, the tributaries of reservior are usually influenced by upstream inflow and the mainsream backflow, water depth and volume as well as the water surface area is not a constant, sometimes it changed a lot, especially in the tributaries of huge reservior, like China Three Goeges Reservior, the daily discharge of which reaches 40 thousand m^3/s. I refferred some papers, but some of the new parameters have significant limitations, it's not suitable for a deep reservoir with large runoff.