The sinking and trimming of the hull in the channel would directly affect the
handling and navigation safety of the ship. In view of the ship sinking, a
series of empirical formulas to estimate the subsidence have been put forward
for vessel in spacious shallow water areas. However, most of the equations are
based on seagoing vessels. They are not suitable for inland ships with small
scales, shallow drafts, and narrow navigation width. Till now, research on ship
squat in intermediate channel has not yielded more practical results. Here, a
generalized physical model is used to study the sinking of 500t class ships in
restricted intermediate channel under different channel widths, water depths,
and speeds. The main factors affecting the squat are analyzed, the empirical
relation is compared with the measured squat. The Barrass
equation is modified, and the calculation relation of the settlement suitable
for inland river ships is proposed. The correlation coefficient
R
2 of the modified equation is 0.818, the standard error is 0.046, and
the maximum error is 0.14 m, which can be used as a reference for inland
waterway design research.
