Journal of Ecology and Rural Environment ›› 2021, Vol. 37 ›› Issue (1): 110-119.doi: 10.19741/j.issn.1673-4831.2020.0009

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Simulation Study on the Effect of Lake Factors on the Humidification of Urban Lakes Based on CFD: Take the Lake of Lieshi Park in Hunan as an Example

ZHANG Wei, CHEN Cun-you, HU Xi-jun, WANG Kai-li, ZHAO Di   

  1. College of Landscape Architecture, Central South University of Science and Technology, Changsha 410004, China
  • Received:2020-01-06 Online:2021-01-25 Published:2021-01-22

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Abstract: Taking the lakes in the Lieshi Park of Hunan Province as the research objects and relative humidity and wind speed as evaluation indicators, the relationship between lake factor (indexes of lake area and form) and the humidification effect of the lake in summer was studied by using field measurement in combination with computational fluid dynamics (CFD) simulation. The results indicate that (1) Under the influence of dominant wind direction in summer, the order of different regions of the study area was downwind, vertical wind and upwind successively in terms of the overall relative humidity from high to low, and the humidification effect was significant within 1 500 m away from the lake; (2) The humidification effect of the lake was positively correlated with index of lake area but negatively correlated with index of lake form and distance, among which index of lake area was the most significant factor. When lake area was reduced to 0, the relative humidity in the downwind region was significantly affected with a decline of 7.4-8.2 percentage point, and that of the central lake region decreased by 15.1-15.5 percentage point; When lake area was reduced by a half, the relative humidity in the downwind region decreased by 2.3-3.0 percentage point, and correspondingly the humidification effect of the lake was weakened. (3) When lake area remained unchanged but the index of lake form was increased, the underlying surface of the lake and water in the lake changed, and some regions of the lake were affected. When the index of lake form was increased by 1.5 times of the actual example, the relative humidity in the downwind region decreased by 0.6-1.3 percentage point; when the index of lake form was increased to be twice as much as the actual example, the relative humidity in the downwind region decreased by 1.7-2.2 percentage point. This study is of great significance for providing references to the improvement of the microclimate around urban lakes and for the future urban lake planning and construction.

Key words: microclimate, CFD simulation, urban lake, lake factor, humidity effect

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