Short-Term Seasonal Changes Of Dzita Beach (Ghana) Using GIS And Photogrammetry

Emmanuel Brempong, University of Cape Coast, ACECoR, Centre for Coastal Management, Accra, Ghana, Kwasi Appeaning Addo, Institute for Environment and Sanitation Studies, University of Ghana, Accra, Ghana, Donatus Angnuureng, University of Cape Coast, ACECoR, Centre for Coastal Management,, Cape Coast, Ghana and Philip-Neri Jayson-Quashigah V, University of Ghana, Marine and Fisheries Sciences, Accra, Ghana
Abstract:
Beaches play a vital role in coastal dynamics and therefore it is important to measure the changes overtime. This must be done with high precision and continuous monitoring over time. Beach systems are affected by both natural and anthropogenic activities and this occurs over a short period of time. The aim of this study is to determine short-term evolution of the Dzita Beach. The main objectives of this study is to assess the intra-annual variability of the shoreline, to quantify the seasonal sediment volume changes and assess seasonal intertidal beach profile. In order to achieve this monthly survey was carried out using Unmanned Aerial vehicle from May 2018 to August 2019. Using the UAV (Unmanned Aerial Vehicle) high-precision 3D models from two-dimensional images were produced using photogrammetric techniques, such as Structure from Motion (SfM). The Digital Elevation Models and orthophotos were generated using Argisoft Photoscan and using Geomorphic Change Detection(GCD) plugin in ArcGIS beach volumes were assessed over the period of study, shoreline positions were extracted and assessed using Ambur software over the same period. Preliminary results indicate that erosion rates are high for the short term (-7m/year) with a mean accretion of about 4.8m/year and volume changes varies between -26,850 m3 and 25,880 m3 indicating dominant erosion. The results show that with regular surveys over a longer period of time using UAVs would provide relevant information on beach dynamics
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