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Xi’an University of Technology (2008)

Experimental Study on Inhibiting Water Surface Evaporation of Reservior in Arid Region

Wu Jin Hui

Titre : Experimental Study on Inhibiting Water Surface Evaporation of Reservior in Arid Region

Auteur : Wu Jin Hui

Grade : Master’s Theses 2008

Université : Xi’an University of Technology

Résumé
Northwest China precipitation less evaporation, the total amount of water resources is a serious shortage of water resources has become a bottleneck restricting the local social and economic sustainable development. Water, water and other sectors to carry out water-saving research, how to effectively reduce the reservoir surface evaporation, increase the effective supply of water resources has become the new direction of the water-saving technology in the region. On the basis of previous studies, the paper proposes a polystyrene foam board, polyethylene film and paraffin coverage inhibition reservoir surface evaporation method, the three materials inhibit the water evaporation effect, and further analysis of the different inhibition of the water evaporation measures of economic efficiency. The thesis made the following conclusions : (1) comparative analysis of different surface evaporation in the day, ten-day, monthly scale calculation accuracy. Water vapor transport method, synthesis method, the complementary principle from 2004 to 2006, the date of the test point, mid-month water surface evaporation calculated. The results showed that As the time scale increases, the accuracy of the three methods of calculation have significantly improved, which calculate the accuracy of the highest monthly water surface evaporation. Day water surface evaporation is calculated using three methods to water vapor transport method the highest accuracy ; mid-month water surface evaporation calculated using the comprehensive method to calculate the highest accuracy. (2) the establishment of a segmentation model of water surface evaporation. Comparison of water surface evaporation results calculated by the three methods of water vapor transport method, law, the principle of complementarity, in a period of little change in evaporation, the simulation of the effect of the three methods of evaporation are better, but in larger evaporation 5 to August, three methods showed varying degrees of difference between the measured evaporation. For this feature, different time periods to establish a computational model of water surface evaporation. The results show that the model fitting accuracy, and can more accurately reflect the trend of the test point evaporation. (3) The comparative analysis of the coverage under the conditions of the three materials inhibit the effect of water surface evaporation. The results show that due to the material density, reflectance, heat insulation properties, such as different, the three materials of the effect of suppressing water evaporation large differences. Inhibit the efficiency of the water evaporation : polystyrene foam board> polyethylene film paraffin. Combination of water surface evaporation, and inhibit the water evaporation calculation model proposed conditions of coverage, test and test points from 2000 to 2003. (4) to predict the effect of coverage under the conditions inhibit the water evaporation. Gray the topology prediction Law of the experimental points from 2005 to 2015 to predict water surface evaporation and inhibit the water evaporation effect under the conditions of different coverage analysis. The results showed that 51.97% average inhibition efficiency of polystyrene foam board, polyethylene benzene board 44.35%, 20.83% paraffin addition to paraffin inhibition ineffective, the other two methods of suppression better water surface evaporation. (5) The comparative analysis of the economic benefits of the three materials covering conditions inhibit the water evaporation measures. From the output efficiency of water-saving measures, the economic benefits of the high and low order : polyethylene film> polystyrene foam board> paraffin. Polyethylene film to inhibit evaporation of water surface measures year to recover the cost, it is recommended to promote the actual production.

Mots clés : Evaporation from reservoirs Measures to inhibit the water evaporation Inhibition of water surface evaporation model Gray topology prediction Arid and semi- arid regions

Présentation (Dissertationtopic )

Page publiée le 1er mai 2013, mise à jour le 5 décembre 2017