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Conference Paper

Assessment of impacts of shoreline change on the nearshore marine environment at Gazi bay, Kenya

Authors

Mwangi,  Pauline
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Maina,  Joseph
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kairo,  James
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ndung'u,  Jane
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mungai,  Fredrick
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nguu,  Josephat
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Mwangi, P., Maina, J., Kairo, J., Ndung'u, J., Mungai, F., Nguu, J. (2023): Assessment of impacts of shoreline change on the nearshore marine environment at Gazi bay, Kenya, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3115


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020475
Abstract
Coastal shorelines are naturally dynamic systems, influenced by both human and natural processes. Change in shoreline position cause negative impacts within and at the adjacent ecosystems. The study quantified the impacts of shoreline change on the nearshore marine environment at Gazi bay, Kenya; between 1989 and 2020. Using a combination of remotely sensed data and Geographic Information System, shoreline positions were delineated, hotspot areas were identified and possible potential drivers of shoreline change were established. A digital shoreline analysis system (DSAS) computed the rate of shoreline change while a hybrid supervised and unsupervised classification was applied in mapping land use land cover change. It was observed that south western creek of Gazi bay is undergoing shoreline erosion of -1.29 m/y and accretion is mainly experienced at the northern side, while erosion is mainly experienced at the southern side of the bay. About 55% of mangroves were lost between 1989 to 2020 and shoreline prediction indicates that some of the coastal infrastructures will be lost. At Mkurumudzi river mouth there was formation of sandspit, sandbars and estuary degradation. The causative agents of shoreline change include poor land use patterns and climate change. Mangroves are the major source of livelihood and source of income through the sale of carbon credits known as Mikoko Pamoja project in Gazi bay. Nature-based solutions can be employed to ensure sustainable mangrove restoration and shoreline change mitigation. The results of this study provide important data and information for better scenario coastal planning and management.