tailieunhanh - Lake Nasser evaporation reduction study

This study aims to evaluate the reduction of evaporation of Lake Nasser’s water caused by disconnecting (fully or partially) some of its secondary channels (khors). This evaluation integrates remote sensing, Geographic Information System (GIS) techniques, aerodynamic principles, and Landsat7 ETM+ images. Three main procedures were carried out in this study; the first derived the surface temperature from Landsat thermal band; the second derived evaporation depth and approximate evaporation volume for the entire lake, and quantified evaporation loss to the secondary channels’ level over one month (March) by applied aerodynamic principles on surface temperature of the raster data; the third procedure applied GIS suitability analysis to determine which of these secondary channels (khors) should be disconnected. The results showed evaporation depth ranging from mm/day at the middle of the lake to mm/day at the edge. The evaporated water-loss value throughout the entire lake was about billion m3 /month (March). The analysis suggests that it is possible to save an approximate total evaporation volume loss of million m3 / month (March), and thus billion m3 /year, by disconnecting two khors with approximate construction heights of 8 m and 15 m. In conclusion, remote sensing and GIS are useful for applications in remote locations where field-based information is not readily available and thus recommended for decision makers remotely planning in water conservation and management. | Journal of Advanced Research 2010 1 315-322 Cairo University Journal of Advanced Research ORIGINAL ARTICLE Lake Nasser evaporation reduction study Hala . Ebaid a Sherine S. Ismail b a Survey Research Institute Delta Barrage Cairo 13621 Egypt b Nile Research Institute Delta Barrage Cairo 13621 Egypt Received 4 March 2010 revised 13 May 2010 accepted 8 June 2010 Available online 20 October 2010 KEYWORDS Remote sensing Landsat GIS Evaporation Lake Nasser Abstract This study aims to evaluate the reduction of evaporation of Lake Nasser s water caused by disconnecting fully or partially some of its secondary channels khors . This evaluation integrates remote sensing Geographic Information System GIS techniques aerodynamic principles and Landsat7 ETM images. Three main procedures were carried out in this study the first derived the surface temperature from Landsat thermal band the second derived evaporation depth and approximate evaporation volume for the entire lake and quantified evaporation loss to the secondary channels level over one month March by applied aerodynamic principles on surface temperature of the raster data the third procedure applied GIS suitability analysis to determine which of these secondary channels khors should be disconnected. The results showed evaporation depth ranging from mm day at the middle of the lake to mm day at the edge. The evaporated water-loss value throughout the entire lake was about billion m3 month March . The analysis suggests that it is possible to save an approximate total evaporation volume loss of million m3 month March and thus billion m3 year by disconnecting two khors with approximate construction heights of 8 m and 15 m. In conclusion remote sensing and GIS are useful for applications in remote locations where field-based information is not readily available and thus recommended for decision makers remotely planning in water conservation and management. 2010 Cairo University. Production and .

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