期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2005
卷号：16
期号：4
页码：269-273
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Amadou Gaye , Alain Viltard , Pierre de Félice Laboratoire de Physique de l’atmosphère Siméon Fongang (LPASF), École supérieure polytechnique, Unité Cheikh Anta Diop (Ucad), BP 5085, Dakar, Sénégal, Laboratoire de météorologie dynamique (LMD) - Institut Pierre-Simon Laplace (IPSL), École polytechnique, 91128 Palaiseau cedex, France Key words: hydrology, rainfall, squall lines, West Africa, satellite imaging and geomatics Page(s) : 269-73 Published in: 2005 Squall lines (SLs) which travelled across West Africa during July, August, and September 1986 and 1987, were observed based on 8 daily slots of Meteosat IRT channel. The rainfall was computed using a dataset of 800 raingauges. The life duration of a SL was about 11 slots (30 hours), its mean area (threshold -30°C) was 430,000 km 2. During its east-west movement across Western Africa its mean velocity was 14 m/s; it brought a water volume of 18 km 3. Its swath varied between 400,000 km 2 and 6 million km 2 according to its dimension and life duration. SLs contributed to 50% of the total rainfall in 1986 against 80% in 1987.
关键词：hydrology; rainfall; squall lines; West Africa; satellite imaging and geomatics
