Reconstruction of Water Surface Energy Balance and Evaporation Model under Floating Ball Coverage

XU Si-yuan; YAN Xin-jun; WANG Hai-tao; SHI Ke-bin

doi:10.11988/ckyyb.20221405

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (3) : 22-29. DOI: 10.11988/ckyyb.20221405

Water Resources

Reconstruction of Water Surface Energy Balance and Evaporation Model under Floating Ball Coverage

XU Si-yuan^1,2, YAN Xin-jun^1,2, WANG Hai-tao^1,2, SHI Ke-bin^1,2

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Abstract

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 distribution 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 surface evaporation.Our results indicate that,when compared to uncovered water surfaces,the overall net radiation absorption 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 aerodynamic terms,our model for calculating surface evaporation under covered conditions demonstrates high precision.

Key words

floating ball / water-saving materials / energy balance / evaporation model / utilization efficiency of water resource

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XU Si-yuan, YAN Xin-jun, WANG Hai-tao, SHI Ke-bin. Reconstruction of Water Surface Energy Balance and Evaporation Model under Floating Ball Coverage[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(3): 22-29 https://doi.org/10.11988/ckyyb.20221405

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