标题:Spatialized estimates of evapotranspiration of irrigated crops using remote sensing: Application to irrigation management in the Haouz plain (Marrakech, Morocco)
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:2009
卷号:20
期号:1
页码:123-130
DOI:10.1684/sec.2009.0177
出版社:John Libbey Eurotext
摘要:Figures See all figures Authors Vincent Simonneaux , Michel Lepage , Dorian Helson , Jérome Metral , Sonia Thomas , Benoît Duchemin , Mohamed Cherkaoui , Hakim Kharrou , Brahim Berjami , Abdelghani Chehbouni CESBIO Unité mixte de recherche (CNRS, UPS, CNES, IRD) 18, avenue Edouard-Belin 31401 Toulouse France, ORMVAH Office régional de mise en valeur agricole du Haouz Marrakech Maroc, ABHT Agence de bassin hydrologique du Tensift Marrakech Maroc Key words: evapotranspiration, irrigation, remote sensing, water budget DOI : 10.1684/sec.2009.0177 Page(s) : 123-30 Published in: 2009 Satellite monitoring of irrigation (SAMIR) is software, which uses satellite images in computing spatialized estimates of evapotranspiration (ET) and irrigation water budgets for larges areas. Remote sensing offers a synoptic view of vegetation development, which is key information for reliable computing of ET. The ET is obtained using the FAO method, well suited for computation over larges areas where little information is usually available about crops and soils. The water budget is computed by linking to the FAO model a soil module including (1) a surface compartment accounting for soil evaporation, (2) a root compartment accounting for crop transpiration and (3) a deep compartment for water storage. The computation of the water budget requires climatic data (reference ET – namely "ET0" – and rainfall data), land cover data and crop development data (for estimating crop coefficients of the FAO method). These last two data types are obtained from remote sensing. Irrigation may be input when it is known, but it is usually estimated from the computation of the water budget, using hypotheses on water management modes and especially the average water stress level allowed. This tool was developed jointly with the "Office régional de mise en valeur agricole du Haouz" (ORMVAH) in charge of irrigation in the area. The irrigation estimates at the scale of irrigation sectors may be compared with known water inputs from dams and traditional seguias (channels deriving water from rivers) to estimate pumpings in the aquifer. In a context of strong pressure applied on water resources, we emphasize the potential of satellite images for monitoring irrigation and water management at the watershed scale.
关键词:evapotranspiration; irrigation; remote sensing; water budget