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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/hess-2020-189
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2020-189
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  05 Jun 2020

05 Jun 2020

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This preprint is currently under review for the journal HESS.

Optimal water use strategies for mitigating high urban temperatures

Bin Liu1,2, Zhenghui Xie1,2, Shuang Liu3, Yujing Zeng4, Ruichao Li1,2, Longhuan Wang1,2, Yan Wang1,2, Binghao Jia1, Peihua Qin1, Si Chen1,2, Jinbo Xie1, and Chunxiang Shi5 Bin Liu et al.
  • 1State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 2University of Chinese Academy of Sciences, Beijing, China
  • 3Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China
  • 4Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, New Jersey 08540, USA
  • 5National meteorological information center, China Meteorological Administration, Beijing, China

Abstract. Urban irrigation and road sprinkling are methods for mitigating high urban temperatures which are expected to enhance evapotranspiration and affect the urban weather, climate, and environment, and the optimization of limited water supplies is necessary in regions with water shortages. In this study, we implemented urban water usage schemes such as urban irrigation and road sprinkling in the Weather Research and Forecasting (WRF) model, and assessed their effects with different amounts of water in city centers, suburbs, and rural areas by using the WRF model at a resolution of 1-km Beijing, China. In addition, we developed an optimization scheme with a cooling effect as the optimal objective and the total water supply as the constraint condition. Nonlinear relationships were identified between the cooling effect and water consumption for both road sprinkling and urban irrigation, and the cooling effect due to urban irrigation was more effective than that attributed to road sprinkling. Based on the optimal water management scheme and according to the Beijing's 13th Five Year Plan, about 90 % of the total water supply should be used for urban irrigation and 10 % for road sprinkling as the most effective approach for decreasing urban temperatures by about 1.9 °C.

Bin Liu et al.

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Data from research on optimal water use strategies to mitigate high urban temperatures L. Bin https://doi.org/10.4121/uuid:01621202-7ec4-4643-84b5-5f9ec2966004

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Latest update: 28 Sep 2020
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Short summary
We implemented both urban water use scheme in a model (Weather Research and Forecasting model), and assessed their cooling effects with different amounts of water in different part of the city (center, suburb and rural area) for both road sprinkling and urban irrigation by model simulation. Then, we developed an optimization scheme to find out the optimal water use strategies for mitigating high urban temperatures.
We implemented both urban water use scheme in a model (Weather Research and Forecasting model),...
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