Analysis of Underwater Topographic Survey of Stilling Basin Based on Unmanned Survey System

Table 2

Comparison table of elevation parameters among selected sections of the surface outlet stilling basin (unit: m).

Section no.	Location	Maximum height	Minimum height	Average height	Standard deviation	Reference value
1	Overflow transition section	357.15	356.54	356.73	0.26	—
2	Apron	355.42	355.23	355.29	0.08	355.00
3	Apron	356.02	355.23	355.44	0.33	355.00
4	Apron	356.59	355.22	355.54	0.59	355.00
5	End sill	367.08	367.00	367.04	0.03	367.00
6	Antiscour section	361.39	360.48	360.68	0.40	360.30
7	Antiscour transition section	368.58	360.76	364.03	3.11	—

Note. The data in the table is based on the statistical calculation of multiple corresponding measurement points on each section.