Mapping the Sandy Beach Evolution Around Seaports at the Scale of the African Continent
| Autor: | Gerben Hagenaars, Yongjing Mao, Sierd de Vries, Tiedo Vellinga, Wiebe P. de Boer, Jill H. Slinger |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
Beach evolution Coastline dynamics Ocean Engineering 010501 environmental sciences Coastal erosion 01 natural sciences Port design lcsh:Oceanography lcsh:VM1-989 Hotspot (geology) Coastal engineering Satellite imagery lcsh:GC1-1581 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering business.industry Environmental resource management lcsh:Naval architecture. Shipbuilding. Marine engineering Sediment transport Port (computer networking) Geography Breakwater business Sustainable ports |
| Zdroj: | Journal of Marine Science and Engineering, Vol 7, Iss 5, p 151 (2019) Journal of Marine Science and Engineering Volume 7 Issue 5 Journal of Marine Science and Engineering, 7(5) |
| ISSN: | 2077-1312 |
| Popis: | In Africa, several new seaport developments are being considered. In sedimentary environments, such port developments can have adverse impacts on the evolution of adjacent coastlines. To learn from past port engineering practice, we created a unique database containing the coastline evolution and characteristics of 130 existing African seaports. Whereas the systematic mapping of coastal impacts was previously hampered by data availability, innovative automated satellite image processing techniques have enabled us to intercompare ports at an unprecedented continental scale. We found large geographical differences with respect to the beach evolution. The total detected changes in the beach area between 1984 and 2018 totaled 44 km2, of which ca. 23 km2 is accretion and ca. 21 km2 is erosion. The top 10% &ldquo hotspot&rdquo ports account for more than 65% of these changes. These hotspots exhibit common characteristics, namely: they are located on open coastlines, have large alongshore sediment transport potential, and have large cross-shore breakwaters. Although these driving characteristics are well established in coastal engineering theory, our results indicate that the beaches adjacent to the existing seaports have been and remain seriously affected by these drivers. Our results can be used to inform beach maintenance strategies for existing seaports and to support planners and engineers to minimize long-term coastal impacts of port expansions and new port developments in Africa in the future. |
| Databáze: | OpenAIRE |
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