| Popis: |
Oil spills are hazardous due to their impact on the people, the environment and economic wellbeing of the society. The study examined the space-time trend and pattern of oil spills in the Niger Delta (2006-2016). Data were sourced from the National Oil Spill Detection and Response Agency (NOSDRA). Mann-Kendal trend and Getis-Ord Gi* statistics were used to identify the spatial and temporal trend. A total of 6,487 incidents were identified, about 31% were recorded on Tuesday and Wednesday while the highest number (10%) of incidents occurred in May. The average nearest distance among events indicates spatial clustering, as the observed mean distance (0.29km) is significantly (Z-score -121.69, P < 0.01) smaller than expected mean distance (1.39km). Of the 8,900 total locations (grid size of 2.8km, 132 months), 941 (10.57%) contain at least one incident for at least one-time step interval. These 941 locations comprise 124,212 space-time bins of which 4,262 (3.43%) have incident counts greater than zero. These resulted in trend statistics of 10.61 (P |
