Mean-draft change when entering water of different density - the core FWA / DWA relation, scaled for any density delta.
Formula
$$ \Delta T = \frac{\Delta \cdot (\rho_0 - \rho_1)}{\rho_1 \cdot TPC} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $\rho_0, \rho_1$ | Departure / arrival water density | kg/m³ | hydrometer |
| $\Delta$ | Displacement | t | loading computer |
| $TPC$ | Tonnes per cm at current draft | t/cm | hydrostatics |
Sources
- Kemp & Young - Ship Stability.