Table 1.
Shoreline change results in pre- and post-construction of coastal development project.
| Parameters | Pre-construction (1966–2002) | Post-construction (2002–2023) | ||
|---|---|---|---|---|
| Khlong Wan coastline | Wa Ko coastline | Khlong Wan coastline | Wa Ko coastline | |
| STA. (number of transects) | 0 + 000 to 1 + 550 (63) | 1 + 575 to 6 + 500 (198) | 0 + 000 to 1 + 550 (63) | 1 + 575 to 6 + 500 (198) |
| Mean NSM (m) | –10 | 1 | 18 | 6 |
| Minimum NSM (m) | –26 | –12 | –3 | –13 |
| Maximum NSM (m) | 8 | 16 | 77 | 250 |
| Accretion (%) | 8.0 | 33.3 | 96.8 | 33.3 |
| Retreat (%) | 82.5 | 27.3 | 1.6 | 51.5 |
| Stable (%) | 9.5 | 39.4 | 1.6 | 15.2 |
| Uncertainty of NSM (m) | ± 3 | ± 3 | ± 0.8 | ± 0.8 |
| Shoreline change rates using EPR (m/y) | ||||
| Mean shoreline change rate | –0.28 | 0.04 | 0.84 | 0.28 |
| Maximum accretion rate | 0.23 | 0.45 | 3.67 | 11.89 |
| Mean accretion rate | 0.15 | 0.24 | 0.86 | 1.17 |
| Maximum retreat rate | –0.72 | –0.32 | –0.16 | –0.64 |
| Mean retreat rate | –0.36 | –0.19 | –0.16 | –0.22 |
| Uncertainty of EPR | ± 0.08 | ± 0.08 | ± 0.05 | ± 0.05 |
Note: NSM = net shoreline movement; EPR = end point rate.