Analysis of Bushfires Spatial and Temporal Variability in Guinea

• 作者: Alassane Bah Daouda Badiane Diakaria Diallo Ibra Toure Idrissa Diaby Mamadou Ba?lo Barry Moussa Diakhate Sa?dou Moustapha Sall Tamba Nicolas Millimono
• 来源期刊: 大气和气候科学(英文)
• 学科: 医学
• 关键词: GUINEA Bushfires VARIABILITY MODIS
• 年，卷（期）: dqhqhkxyw_2017,（4）
• 页码范围: 463-475
• 页数: 13页
• 分类号: R73

摘要

Guinea is confronted to the increasing risks of bushfires that destroy thousands of hectares of vegetation cover every year. Very little research is devoted to the variability of those fires, which makes it a serious threat to both wildlife and human habitats. The current study investigates the spatial and temporal distribution of bushfires in the period from 2003 to 2016. The method used is the geospatial technology: we first filter pixels corresponding with active light supplied by MODIS images (Moderate Resolution Imaging Spectroradiometer) and estimate their densities following the square meshing procedure. Burned areas are deducted from the estimated pixel densities by calculations. The results highlight great occurrence of fires: 4 to 48 pixels of active fire per year and per 100 km2 depending on the location;2 to 5 million hectares per year of burned areas (20,000 to 50,000 sqkm). Almost 8 to 24% the size of the whole country. The prefectures of Beyla, Siguiri, Kouroussa, Kankan, Dinguiraye, Mali and Tougué are the most exposed areas. Every year, fire activities are observed as from October and between May and June. They are however mitigated according to the regions (or the geographical domains). Summits of bushfires activities are generally reached between December and January.