To address the issue of low water resource utilization caused by intense evaporation in plain reservoirs in arid regions,we have chosen black high-density polyethylene floating balls as a means to combat evaporation and promote water conservation.This study examines the response mechanism of water surface evaporation and the distri-bution of water energy balance components under floating ball coverage throughout the non-freezing period using theoretical analysis,modeling,and outdoor experiments.On this basis,we developed a calculation model of water sur-face evaporation.Our results indicate that,when compared to uncovered water surfaces,the overall net radiation ab-sorption rate decreases by approximately 12.6％under a 73％floating ball coverage.The average monthly latent heat flux required for evaporation decreases by 61.8％to approximately 148.73 W/m2.The sensible heat flux and heat storage flux of water body also experience significant changes.By accounting for modifications in energy and aerody-namic terms,our model for calculating surface evaporation under covered conditions demonstrates high precision.
floating ballwater-saving materialsenergy balanceevaporation modelutilization efficiency of water resource
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