| Projecting Climate and Vegetation Cover Change Impacts on Actual Evapotranspiration Using Time-Series Remote Sensing Data |
| Paper ID : 1029-ICRSSSA-FULL |
| Authors |
|
eslam farg *1, mohsen nabil nabil2, mohamed El Sharkawy3, sayed madany arafat4 1agricultural applications department , Agricultural applications, Soils and marine sciences, National Authority for Remote Sensing and Space sciences NARSS, Cairo, Egypt 2agricultural applications, agricultural applications, soils and marine sciences, national authority for remote sensing and space sciences 3Soil and Water Dept., Faculty of Agriculture, Beni-Suef University, Egypt 4NARSS |
| Abstract |
| Recently remote sensing represents a powerful and effective tool to monitor and assess the change in land surface temperature (LST), vegetation cover and evapotranspiration (ET) in agricultural ecosystems. Egypt classifies as a semi-arid region with a moderate to high ET rate from vegetation, especially in newly reclaimed areas far from the Nile delta and its valley. In this study, satellite imagery was used to monitor and determine the changes in ET rates against the increased reclaimed vegetative areas from 2003 to 2020 in the western Nile delta. SEBS model was used to calculate the actual ET Landsat surface temperature. Results showed that the vegetation cover increased moderately from 2003 to 2011 and rapidly increased from 2011 to 2020. Using correlation analysis, 1044 ground truth points GTPs used showed that NDVI negative correlation to LST and high positive correlation to evapotranspiration. The values of the actual ET with a maximum value of the annual ET per each vegetation cover type were 197849.70, 129504.63 m3/ year /total area (hectare) respectively for tree crops and herbaceous crops in 2020, and predicted values were 535187.81, 262560.50 m3/ year /total area (hectare) respectively for tree crops and herbaceous crops in 2050. In conclusion, further studies are required to evaluate water resources sustainability management. Otherwise, a rapid increase of vegetation cover will lead to significant overconsumption of the only source of water, which is groundwater, which increases the chances of desertification and drought in the study area. |
| Keywords |
| Normalized Difference Vegetation Index (NDVI), Evapotranspiration (ET), Remote Sensing, Drought |
| Status: Accepted (Oral Presentation) |
