Characteristics and Estimation of Dew in the Loess Hilly Region of Northern Shaanxi Province, China

Zhifeng Jia (), Yingjie Chang, Hao Liu, Ge Li, Zilong Guan, Xingchen Zhang, Ruru Xi, Pengcheng Liu and Yu Liu
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Zhifeng Jia: School of Water and Environment, Chang ’an University, Xi’an 710054, China
Yingjie Chang: School of Water and Environment, Chang ’an University, Xi’an 710054, China
Hao Liu: School of Water and Environment, Chang ’an University, Xi’an 710054, China
Ge Li: School of Water and Environment, Chang ’an University, Xi’an 710054, China
Zilong Guan: PowerChina Northwest Engineering Corporation Limited, Xi’an 710065, China
Xingchen Zhang: PowerChina Northwest Engineering Corporation Limited, Xi’an 710065, China
Ruru Xi: School of Water and Environment, Chang ’an University, Xi’an 710054, China
Pengcheng Liu: School of Water and Environment, Chang ’an University, Xi’an 710054, China
Yu Liu: College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China

Sustainability, 2024, vol. 16, issue 6, 1-18

Abstract: As a non-precipitation water source, dew is important for plant and animal survival and crop production in arid and water-scarce areas. This study assessed the amount of dew in a dry zone in a long-term (2016 to 2022) field observation experiment at the Ansai Experimental Station, a typical loess hilly area in China. Dew primarily occurred in summer and autumn, with a frequency of >50%. The average annual dew amount was 29.20 mm, with an average annual rainfall of 641.8 mm. The average annual dew-to-rain ratio was 4.58%, and the average annual number of dew days was 143.6 d/a. The surface soil moisture content increased by approximately 1.02% with increasing dew amounts. The change in the soil moisture at a 5 cm depth was 0.14% on average and lagged substantially by 1 h. Using the Beysens model, the annual estimated and measured dew amounts in 2022 were 25.27 and 29.84 mm, respectively, and the annual normalized root mean square deviation (NRMSD) was 0.17. Thus, the Beysens model evaluated the dew amount in the study area well at the monthly and annual scales. The quantification of dew resources can provide support for the development, utilization, and management of limited water resources in arid areas, promoting more accurate decision-making for the sustainable development of water resources in the future.

Keywords: dew; Beysens model; model estimation; loess hilly region; water ecosystem (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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