Your search found 6 records
1 Melesse, A. M.; Weng, Q.; Thenkabail, Prasad S.; Senay, G. B.. 2007. Remote sensing sensors and applications in environmental resources mapping and modelling. Sensors, 7:3209-3241.
Remote sensing ; Sensors ; Imagery ; Models ; Environmental effects ; Drought ; Soil water ; Mapping ; Hydrology ; Forecasting ; Early warning systems
(Location: IWMI HQ Call no: IWMI 621.3678 G000 MEL Record No: H040633)
The history of remote sensing and development of different sensors for environmental and natural resources mapping and data acquisition is reviewed and reported. Application examples in urban studies, hydrological modeling such as land- cover and floodplain mapping, fractional vegetation cover and impervious surface area mapping, surface energy flux and micro-topography correlation studies is discussed. The review also discusses the use of remotely sensed-based rainfall and potential evapotranspiration for estimating crop water requirement satisfaction index and hence provides early warning information for growers. The review is not an exhausted application of the remote sensing technique rather summary of some important applications in environmental studies and modeling.
2 Senay, G. B.; Budde, M. E.; Verdin, J. P.; Rowland, J. 2009. Estimating actual evapotranspiration from irrigated fields using a simplified surface energy balance approach. In Thenkabail, P. S.; Lyon, J. G.; Turral, H.; Biradar, C. M. (Eds.). Remote sensing of global croplands for food security. Boca Raton, FL, USA: CRC Press. pp.317-329. (Taylor & Francis Series in Remote Sensing Applications)
Remote sensing ; Evapotranspiration ; Estimation ; Irrigated land ; Energy balance / Afghanistan / Baghlan province
(Location: IWMI HQ Call no: 631.7.1 G000 THE Record No: H042428)
3 Senay, G. B.; Asante, K.; Artan, G. 2008. Water balance dynamics in the Nile Basin. In Abtew, W.; Melesse, A. M. (Eds.). Proceedings of the Workshop on Hydrology and Ecology of the Nile River Basin under Extreme Conditions, Addis Ababa, Ethiopia, 16-19 June 2008. Sandy, UT, USA: Aardvark Global Publishing. pp.277-290.
(Location: IWMI HQ Call no: 551.48 G136 ABT Record No: H044328)
(1.10 MB)
4 Rebelo, Lisa-Maria; Senay, G. B.; McCartney, Matthew. 2012. Flood pulsing in the Sudd Wetland: analysis of seasonal variations in inundation and evaporation in South Sudan. Earth Interactions, 16(1):1-19. [doi: https://doi.org/10.1175/2011EI382.1]
Flooding ; Wetlands ; Ecosystems ; Biodiversity ; Seasonal variation ; Evaporation ; Evapotranspiration ; Remote sensing ; Vegetation ; Hydrological factors ; Catchment areas ; Desalinization ; Models / Sudan / Bahr el Jebel / Sudd Region / Lake Victoria / White Nile River / Nile River
(Location: IWMI HQ Call no: e-copy only Record No: H044750)
(1.98 MB)
Located on the Bahr el Jebel in South Sudan, the Sudd is one of the largest floodplain wetlands in the world. Seasonal nundation drives thehydrologic, geomorphological, and ecological processes, and the annual flood pulse is essential to the functioning of the Sudd. Despite the importance of the flood pulse, various hydrological interventions are planned upstream of the Sudd to increase economic benefits and food security. These will not be without consequences, in particular for wetlands where the biological productivity, biodiversity, and human livelihoods are dependent on the flood pulse and both the costs and benefits need to be carefully evaluated. Many African countries still lack regional baseline information on the temporal extent, distribution, and characteristics of wetlands, making it hard to assess the consequences of development interventions. Because of political instability in Sudan and the inaccessible nature of the Sudd, recent measurements of flooding and seasonal dynamics are inadequate. Analyses of multitemporal and multisensor remote sensing datasets are presented in this paper, in order to investigate and characterize flood pulsing within the Sudd wetland over a 12-month period. Wetland area has been mapped along with dominant components of open water and flooded vegetation at five time periods over a single year. The total area of flooding (both rain and river fed) over the 12 months was 41 334 km2, with 9176 km2 of this constituting the permanent wetland. Mean annual total evaporation is shown to be higher and with narrower distribution of values from areas of open water (1718 mm) than from flooded vegetation (1641 mm). Although the exact figures require validation against ground-based measurements, the results highlight the relative differences in inundation patterns and evaporation across the Sudd.
5 Velpuri, Naga Manohar; Senay, G. B.; Schauer, M.; Garcia, C. A.; Singh, R. K.; Friedrichs, M.; Kagone, S.; Haynes, J.; Conlon, T. 2020. Evaluation of hydrologic impact of an irrigation curtailment program using Landsat satellite data. Hydrological Processes, 34(8):1697-1713. [doi: https://doi.org/10.1002/hyp.13708]
Irrigation water ; Water conservation ; Hydrological factors ; Evapotranspiration ; Landsat ; Satellite imagery ; Agriculture ; Water use ; Water availability ; Crops ; Precipitation ; Irrigated sites ; Lakes ; River basins ; Energy balance ; Models / USA / Oregon / Upper Klamath Lake Basin / Wood River / Sprague River / Williamson River
(Location: IWMI HQ Call no: e-copy only Record No: H049626)
https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.13708
https://vlibrary.iwmi.org/pdf/H049626.pdf
https://vlibrary.iwmi.org/pdf/H049626.pdf
(7.52 MB) (7.52 MB)
Upper Klamath Lake (UKL) is the source of the Klamath River that flows through southern Oregon and northern California. The UKL Basin provides water for 81,000+ ha (200,000+ acres) of irrigation on the U.S. Bureau of Reclamation Klamath Project located downstream of the UKL Basin. Irrigated agriculture also occurs along the tributaries to UKL. During 2013–2016, water rights calls resulted in various levels of curtailment of irrigation diversions from the tributaries to UKL. However, information on the extent of curtailment, how much irrigation water was saved, and its impact on the UKL is unknown. In this study, we combined Landsat-based actual evapotranspiration (ETa) data obtained from the Operational Simplified Surface Energy Balance model with gridded precipitation and U.S. Geological Survey station discharge data to evaluate the hydrologic impact of the curtailment program. Analysis was performed for 2004, 2006, 2008–2010 (base years), and 2013–2016 (target years) over irrigated areas above UKL. Our results indicate that the savings from the curtailment program over the June to September time period were highest during 2013 and declined in each of the following years. The total on-field water savings was approximately 60 hm3 in 2013 and 2014, 44 hm3 in 2015, and 32 hm3 in 2016 (1 hm3 = 10,000 m3 or 810.7 ac-ft). The instream water flow changes or extra water available were 92, 68, 45, and 26 hm3, respectively, for 2013, 2014, 2015, and 2016. Highest water savings came from pasture and wetlands. Alfalfa showed the most decline in water use among grain crops. The resulting extra water available from the curtailment contributed to a maximum of 19% of the lake inflows and 50% of the lake volume. The Landsat-based ETa and other remote sensing datasets used in this study can be used to monitor crop water use at the irrigation district scale and to quantify water savings as a result of land-water management changes.
6 Senay, G. B.; Kagone, S.; Velpuri, Naga M. 2020. Operational global actual evapotranspiration: development, evaluation, and dissemination. Sensors, 20(7):1915. (Special issue: Advances in Remote Sensors for Earth Observation and Modeling of Earth Processes) [doi: https://doi.org/10.3390/s20071915]
Evapotranspiration ; Evaluation ; Water balance ; Energy balance ; Drought ; Monitoring ; Models ; Moderate Resolution Imaging Spectroradiometer ; Remote sensing ; Satellite observation ; River basins ; Precipitation ; Estimation ; Land cover
(Location: IWMI HQ Call no: e-copy only Record No: H049657)
(3.92 MB) (3.92 MB)
Satellite-based actual evapotranspiration (ETa) is becoming increasingly reliable and available for various water management and agricultural applications from water budget studies to crop performance monitoring. The Operational Simplified Surface Energy Balance (SSEBop) model is currently used by the US Geological Survey (USGS) Famine Early Warning System Network (FEWS NET) to routinely produce and post multitemporal ETa and ETa anomalies online for drought monitoring and early warning purposes. Implementation of the global SSEBop using the Aqua satellite’s Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature and global gridded weather datasets is presented. Evaluation of the SSEBop ETa data using 12 eddy covariance (EC) flux tower sites over six continents indicated reasonable performance in capturing seasonality with a correlation coefficient up to 0.87. However, the modeled ETa seemed to show regional biases whose natures and magnitudes require a comprehensive investigation using complete water budgets and more quality-controlled EC station datasets. While the absolute magnitude of SSEBop ETa would require a one-time bias correction for use in water budget studies to address local or regional conditions, the ETa anomalies can be used without further modifications for drought monitoring. All ETa products are freely available for download from the USGS FEWS NET website.
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