| This article has been：Browse 204Times Download 152Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2023148 |
|
| Spatiotemporal variation in evaporation and its modelling in the Yellow River delta |
|
WANG Feng, REN Jiancheng, LU Xiaoning
|
|
1. Shandong Key Laboratory of Meteorological Disaster Prevention and Reduction, Jinan 250031, China;
2. Binzhou Meteorological Bureau, Binzhou 256612, China; 3. Chengdu University of Information Technology, Chengdu 610225, China
|
| Abstract: |
| 【Objective】The Yellow River delta is a distinctive ecosystem in China, fostering a rich array of plant and animal species. Evaporation is a main component of the hydrological process in the delta. In this paper, we study the spatiotemporal variation in evaporation in the region and present a model to elucidate its relationship with meteorological factors.【Method】The study is based on evaporation and meteorological factors measured in the region; their relationship is analyzed using climate statistics method and GIS.【Result】① Temporarily, annual change of evaporation in spring and summer had been decreasing at significant level, while its change in autumn and winter did not show identifiable trends. Spatially, the evaporation decreased from the northeast to the southwest. ② Seasonal evaporation in the delta showed periodicity. In spring, the primary cycle spanned 10 years, and in summer the periodicity was 5 and 10 years. Autumn displayed cycles of 3, 6, and 13 years, while winter showcased periods of 5-6 and 10-11 years. Overall, the annual evaporation cycle manifested a 10-year period. ③ Annual evaporation was significantly correlated with precipitation, sunshine period, average wind speed, average cloud coverage and average daily temperature, but not correlated to average temperature. Seasonal evaporation was significantly related to precipitation, sunshine duration, relative humidity, cloud coverage and daily temperature. ④ The relative humidity had a significant impact on evaporation regardless of seasons. In contrast, wind speed impacted evaporation only in spring, summer and winter; temperature impacted evaporation in spring and summer; sunshine duration impacted annual evaporation; precipitation negatively impacted evaporation in spring. The measured and modelled evaporation in all seasons agreed well. 【Conclusion】Evaporation in the Yellow River delta is affected by a variety of climate factors, and it shows the “evaporation paradox” phenomenon. Evaporation shows both seasonal and annul periodicity; spatially, it decreases from the northeast to the southwest. The regression model can accurately predict the change in evaporation with meteorological factors. |
| Key words: evaporation; change characteristics; model research; Yellow River delta |
|
|
