This process calculates the residence time of water in a computational cell. The process only takes into account the advective transport — i.e. flows in [] — as derived from SOBEK, Delft3D or another hydrodynamic model. Dispersion is not taken into account.
Delft3D 中的水龄计算表示某个计算网格中水的停留时间，计算过程只考虑对流作用，dispersion作用不考虑。类似于计算水力停留时间。
在D quality 中的设置可以从 Water Quality -> Processes -> ECO | WAQ -> Tracer and temperature -> Continuity -> Residence time 中打开
residual time 计算要打开continuity，water age计算要打开Decayable tracer source。
计算原理在 chapter 15.7, Processes Library User Manual 中。
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