| 引用本文: | 林一凡,霍再林,汪超子,等.Budyko假设在灌区耗水估算的适用性[J].灌溉排水学报,2022,41(10):82-89. |
| LIN Yifan,HUO Zailin,WANG Chaozi,et al.Budyko假设在灌区耗水估算的适用性[J].灌溉排水学报,2022,41(10):82-89. |
|
| 摘要: |
| 【目的】验证Budyko假设在农业灌区的适用性，为准确估计灌区实际耗水提供新方法。【方法】基于全国282个大中型灌区2010—2017年的灌溉量、降水量、潜水蒸发量及实际蒸散发量，验证了Budyko假设对农业灌区耗水估算的适用性，对比分析不同气候条件下的估算准确性。【结果】Budyko假设框架下考虑灌溉水及潜水蒸发量的傅抱璞公式能够较好地估算灌区年度耗水，估算ET与实测ET之间的相对误差小于21.7%。比较而言，该公式在种植结构和灌溉制度较为稳定的湿润区具有更好的适用性。同时，受气象条件、灌区输配水条件、土壤质地、作物种植结构等要素的影响，Budyko水热耦合模型的参数ω具有显著的区域分布特征，表现为随湿润程度增加而增大。【结论】Budyko假设在全国农业灌区年耗水量估算中具有很好的潜力。 |
| 关键词: Budyko假设；灌区；耗水；气候 |
| DOI：10.13522/j.cnki.ggps.2022162 |
| 分类号: |
| 基金项目: |
|
| Considering the Budyko’s Assumption to Estimate Evapotranspiration from Irrigation Districts in China |
|
LIN Yifan, HUO Zailin, WANG Chaozi, ZHANG Chenglong, HAN Zhenzhong, CUI Jing
|
|
1. Collge of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China;
2. Irrigation and Drainage Development Center, Beijing 100054, China
|
| Abstract: |
| 【Objective】The Budyko’s assumption is that evapotranspiration is limited by water in semi-arid regions and by energy in wet regions. This paper applied it to estimate evapotranspiration from irrigated agricultural lands in China. 【Method】The results calculated using the Budyko equation were tested against irrigation, precipitation, groundwater evaporation and real evapotranspiration measured from 2010 to 2017 from 282 irrigation districts across China. Based on these data and results, we analyzed the accuracy of the Budyko equation for cropped lands under different climatic conditions. 【Result】The Budyko equation and the Fu's equation, both considering irrigation and groundwater evaporation, are adequate to estimate evapotranspiration from irrigated cropped lands. The mean relative error between the estimated ET and the measured ET is less than 21.7%. Overall, the estimated ET is more accurate for humid areas, where the planting structure and irrigation are less prone to fluctuation and change, than for other areas. Impacted by meteorology, water supply and distribution, soil texture and planting structure in irrigation districts, the parameter ω in the Budyko curves varies spatially and increases, in general, with humidity. 【Conclusion】The Budyko equation works well for estimating annual evapotranspiration from irrigated cropped lands in China. |
| Key words: Budyko framework; irrigation districts; evapotranspiration; climate |
