DOI: 10.1016/j.jag.2013.05.005
Scopus记录号: 2-s2.0-84897834655
论文题名: Seasonal comparisons of meteorological and agricultural droughtindices in Morocco using open short time-series data
作者: Ezzine H ; , Bouziane A ; , Ouazar D
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 26, 期: 1 起始页码: 36
结束页码: 48
语种: 英语
英文关键词: Drought
; Satellite images
; SPI
; Statistical analysis
; SVI
; SWI
Scopus关键词: drought
; meteorology
; satellite imagery
; seasonality
; statistical analysis
; time series
; vegetation cover
; Morocco
英文摘要: Although the preliminary investigations of NDWI demonstrated its sensitivity to vegetation water con-tent, drought indices based on NDWI short time-series are still understudied compared to those derivedfrom NDVI and LST, such as VCI, SVI and TCI. On the basis of the open data, this paper introduces anew index derived from NDWI short time-series, and explores its performance for drought monitoringin Mediterranean semi-arid area. The new index, Standardized Water Index (SWI), was calculated andspatiotemporally compared to both meteorological drought index (TRMM-based SPI) and to agriculturaldrought index (NDVI-based SVI) for the hydrological years and autumn, winter and spring seasons duringa period of 15 years (1998-2012). Furthermore, the response and spatial agreement of the meteorologi-cal and agricultural drought indices (SWI, SVI and SPI) were compared over two land use classes, rainfedagriculture and vegetation cover, for the studied years and seasons. The validation of SWI was basedon in situ SPI and cereal productions. The analysis of the 336 cross-tables, proportions of concordanceand Cohen's kappa coefficients indicate that SWI and SVI are concordant comparing to other combina-tions for hydrological years and for the three seasons. The study points that the spatial agreements ofdrought indices over rainfed agriculture and over vegetation cover are different. It is relatively moreimportant in the rainfed agriculture than in the vegetation cover areas. Our results show that the agree-ment between vegetation drought indices and meteorological drought indices is moderated to low andthe SPI is slightly more concordant with SWI when it is compared to SVI in autumn and winter seasons.The validation approach indicates that drought affected area, according to SWI, is highly correlated withcereal production. Likewise, a satisfactory correlation was revealed between SWI and in situ SPI. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79665
Appears in Collections: 气候变化事实与影响
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作者单位: Equipe d'Analyse des Systèmes Hydrauliques, Département de Génie Civil, Ecole Mohammedia d'Ingénieurs, Université Mohammed V Agdal, BP765 Agdal, 10000 Rabat, Morocco
Recommended Citation:
Ezzine H,, Bouziane A,, Ouazar D. Seasonal comparisons of meteorological and agricultural droughtindices in Morocco using open short time-series data[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,26(1)